MODEL QUESTION PAPER PHYSICS +1

SET 9

I. Match the following
A                                                     B
a) Newton’s third law                   PV= a constant
b)Bernoulli’s theorem                    F = ma
c) Isothermal change                    Stress α Strain
d) Hooke’s Law                          Recoil of gun
Venturimeter                               Law of conservation of energy (4 x ½ = 2)
II. The velocity of a particle moving in one dimension changes according to the relation
V = at3 – bt2where v is in m/s and t in seconds. (numerical value of a = 2 and b = 1)
a) Find the dimensions of a and b (2)
b) What is the velocity in the 3rd second (1)
III. A player throws a ball vertically upward with a speed 49 m/s
a) What is the direction of acceleration of the ball during the
i) upward and ii)downward motion. (1)
b) What is the velocity and acceleration of the ball at the highest point? (2)
c) Choosing the upward direction as the +ve direction of x-axis, give the signs of
position (x) and velocity (v) during the upward and downward motion of the ball.
Chose x=0 to be the location of the ball from where it was thrown and t=0 to be
the corresponding time. (g = 9.8m/s2) (1)
IV. Two forces of magnitude F each are acting at a point.
a) The magnitude of the sum of these two forces need not be 2F always – Justify (1)
b) For what angle between these two forces, the magnitude of the resultant
becomes F itself. (1)
V. An object that is in flight after being projected is called projectile.
a) At the highest point, what are the vertical and horizontal components of its velocity? (1)
b) In Javelin throw, 45o is preferred. Justify. (1)
c) Obtain the expression for the range of the projectile (2)
OR
A stone tied to a string is whirled in a horizontal circle with constant speed.
a) What is the direction acceleration of the stone? (1)
b) Draw the figure representing the direction of velocity of the stone at two different
instants, during its motion. (1)
c) Use the figure to obtain an expression for centripetal acceleration (2)
VI. Bernoulli’s theorem is basically about the conservation of energy of a non viscous fluid
in steady flow .
a) State and explain Bernoulli’s Principle (1)
b) Derive Bernoulli’s equation (2½)
c) A spin ball projected deviates from its original parabolic trajectory. Why ? (1)
VII. Free liquid drops and bubbles are spherical in shape if the effect of gravity can be
neglected.
a) How will you explain this? (1)
b) What is the excess pressure inside a drop of mercury of radius 3mm at room
temperature? The surface tension of mercury at room temperature is 4.65 x 10-1 N/m (2)
VIII. In rotational motion Moment of inertia plays a similar role as mass does in linear motion.
a) Give an expression for moment of inertia of a rigid body. (½)
b) State and explain perpendicular axes theorem. (2)
c) Moment of inertia of a ring about an axis passing through centre and
perpendicular to the plane of the ring is MR2. Find Moment of inertia about any of
its diameter. (1)
IX. A body of mass M and radius R is allowed to roll along an inclined surface of inclination θ
and height h.
a) Obtain the expression for velocity of the body when it reaches the bottom of the plane (2)
b) Obtain the acceleration of the body along the inclined plane (1)
c) If a solid cylinder and hollow cylinder of same mass and radius are allowed to fall
along the plane from same height, which will reach bottom first and why? (1)
X. Kepler’s laws of planetary motion explain the motion of planet around sun.
a) Obtain a relation between angular momentum and areal velocity of the planet (2)
b) State and prove kepler’s second law (2)
XI. a) Escape velocity from the surface of earth is 11.2km/s. A body is projected with a speed
twice the escape speed from earth. What is the speed of the object far away from earth
(infinity)? Ignore the presence of other planets and sun. (3)
XII. A gas taken in a cylinder with non-conducting walls and frictionless movable piston does
work when heat is supplied to it. Find the expressions for work done if the process is
a)Isothermal b) Adiabatic (4)
XIII. Heat engine is device which converts heat energy to mechanical energy.
a) Draw Carnot cycle and what are process involved in Carnot cycle (2)
b) “The efficiency of a heat engine can never be 100% and the coefficient
Performance of a refrigerator can never be infinity” – Which law of
thermodynamics, put this limitation? State and explain this law (2)
OR
In a thermodynamic process neither heat is absorbed nor rejected
a) Name the process (1)
b) Obtain the expression for work done during this process (3)
XIV. Any motion which repeats itself at regular intervals of time is called periodic motion.
a) What is the condition for a periodic motion to be Simple Harmonic? Give an
example for SHM (1½)
b) Write the expression for total energy of a particle which is in SHM. For what value
of displacement KE and PE are equal during the motion? (2)
XV. In sonometer experiment a segment of a stretched string is vibrated using a tuning fork.
a) Why for a particular length of the segment the paper rider on it vibrates
vigorously and then thrown off? Name the phenomenon (1½)
b) Obtain the expression for the frequency of fundamental mode of vibration of the
string. (2)
XVI. A person likes to stop and park his car on a steep place, which has an inclination of
150 with the horizontal.
a) What should be the minimum friction between the wheels and surface to prevent
the car from sliding down? (1)
b) Whether the safe parking in this place depends on the mass of the car? Give
reason. (2)
XVII. Jumping athletes usually made to land in loose sand. Why (1)
XVIII. Energy neither be created nor be destroyed but can only change from one form to
another.
a) Prove this in the case of a freely falling body (2)
b) A bus and a car are moving with same kinetic energy. Which has greater
Momentum? If same retarding force is applied to both, which one will come to
rest in a shorter time? Why? (2)

MODEL QUESTION PAPER PHYSICS +1

SET 8

1) Fill in the blanks
A B C
a) Power Watt ……………….
b) ………………. kgm2 ML2
c) Torque Joule ……………….
d) Surface Tension ………………. MT-2
(Score 2)
2) If a + bt + ct 2 = x, where x – displacement, t – time. Find the dimensions of b and c. (Score 2)
3) An astronaut in a space shuttle moves along a straight line. The data given below gives the
measured velocities at every two seconds starting from t = 2s.
Velocity
(m/s)
2 4 6 2 0 -2 -4 -2
Time
(s)
2 4 6 8 10 12 14 16
a) Draw v- t graph from t = 2 s to t = 16 s. (Score 3)
b) Find the average acceleration in the time interval from t = 2s to t = 6 s. (Score 2)
4) An athlete throws a javelin with a velocity ‘U’ at an angle ‘θ’
a) Name the shape of the path described and the nature of motion. (Score 1)
b) To achieve the maximum horizontal distance at what angle should he throw the javelin. (Score 1)
c) At the highest point of its motion, what are the values of vertical and horizontal components
of velocity? (Score 2)
d) Derive an expression for maximum horizontal distance travelled. (Score 2)
5) A body is suspended from the roof of a lift by means of a string. If the mass of the body is ‘M’ and ‘T’
the tension of the string, then
a) When the lift is not moving, T = …………………..
b) If the lift is moving up with an acceleration a, T = …………………..
c) If the lift is moving down with an acceleration a, T = …………………..
d) If the string is broken T = ………………….. (Score 4)
6) A car of mass ‘m’ is moving along a circular banked road of radius ‘r’. Draw a neat diagram to
represent the various forces acting on the body. (Score 2)
7) When a body is lifted through a height ‘h’ work has to be done. Let the body fall freely from the
same height .
a) Graphically represent the variations of PE and KE (Score 1)
b) Find the height at which PE = KE (Score 1)
c) State work energy theorem. (Score2)
d) State and prove law of conservation of energy in this case. (Score2)
8) A person is sitting on a stool that is free to rotate nearly without friction about a vertical axis. While
rotating suppose the person stretches his hands out.
a) What happens to the moment of inertia if he folds his hands? (Score 1)
b) What happens to the speed of rotation? (Score 1)
c) State the law behind this phenomenon. (Score 2)
9) Earth can be treated as a sphere of radius ‘R’ and mass ‘M’. ‘A’ is a point at a height ‘h’ above the
surface of Earth . The acceleration due to gravity at Earth surface is ‘g’
a) Obtain a formula to evaluate the acceleration due to gravity at A . (Score 2)
A
b) If we move from equator to pole, the value of ‘g’ …………………………
(increases / decreases / remains the same) (Score 1)
c) What is the value of ‘g’ at the centre of earth? (Score 1)
11-(i) When a fluid is moving, the pressure changes with its velocity. Then
a) How will you explain the working of a sprayer? (Score 2)
b) Name the principle behind this. State the principle. (Score 2)
OR
11-(ii) When rain drops are falling down, they will attain a constant velocity after some time
a) Name the velocity (Score 1)
b) Write the condition at which the drop attains equilibrium. (Score 1)
c) Arrive at an expression for this velocity. (Score 2)
12- By applying first law of thermodynamics
a) Obtain relation between Cp and Cv (Score 3)
b) What happens to the internal energy during isothermal process? (Score 1)
13) A reversible heat engine is operating at two different temperatures T1 and T2 with
an ideal gas as the working substance.
a) Draw the Carnot cycle and explain its working. (Score 3)
b) Derive the expression for efficiency. (Score 2)
14-(i) Which of the following motions represent SHM?
a) Rotation of earth about its axis.
b) Oscillations of the simple pendulum.
c) An arrow released from the bow. (Score 1)
Temperature
(ii) Justify your answer mathematically and hence derive the period of oscillations of
the same. (Score 3)
15-a) When you perform experiment with resonance column apparatus in a lab, at certain height
you can hear maximum sound. What is the concept behind it? (Score1)
b) For an one end closed organ pipe, show that υ1 : υ2: υ3 =1 : 3 : 5 (Score2)

MODEL QUESTION PAPER PHYSICS +1

SET 7

1. Fill in the blanks
a) 1AU=1.5x108 km C = 3x108m/s C = …………… AU/s
b) Force of friction = 1.96N Normal Reaction = 19.6 μ = ……………
c) Time Period = 4 Sec Mass = 1 kg Spring Constant K = …………
d) No. of significant figures
in Area = ………………. Breadth = 2.01 cm Length = 1.00 cm
(4)
2. Mechanical power is represented by P=Fv + Av3ρ where F is the force, v is the velocity, A is the area
and ρ is the density
a) The dimensional formula of power is ………………. (1/2)
b) Check the dimensional validity of the above equation (1)
c) Which of the following equations can’t be obtained by the dimensional method?
i) 􀜶 = 􀜭􀶧 􀯟
􀯚 ii) E = k mv2 iii) P= h ρg iv) N= N0e-λg (1/2)
3. Two cars A and B travelling with speed 20 m/s and 10 m/s respectively applies breaks, so that A
comes to rest in 10 seconds, B comes to rest in 15 seconds
a) Draw the velocity time graph of A and B in the same graph (1)
b) From the graph determine which of the two cars travelled further after breaks were applied and by
how much distance (2)
c) In the above process the wear and tear of which of the car get affected more (1)
4. An object is projected with velocity v at an angle θ to the horizontal
a) Obtain a mathematical expression for the range in the horizontal plane (2)
b) What are the conditions to obtain more horizontal range (1)
c) Find the maximum height of the object when its path makes an angle of 300 with the horizontal
(velocity of projection = 8 m/s) (2)
5. 􀜣⃗ and 􀜤􁈬 ⃗ are two non-zero vectors
a) If 􀸫􀜣 􁈬􁈬⃗ 􀝔 􀜤 􁈬 ⃗􀸫 = 􀜣⃗ . 􀜤􁈬 ⃗, what is the angle between 􀜣⃗ and 􀜤􁈬 ⃗ (1)
b) Find the value of 􀜣 􁈬􁈬⃗ . (􀜣⃗ x 􀜤 􁈬 ⃗) (1)
c) The parallelogram law is used to find the resultant of two vectors. Find the magnitude of the
resultant of these two vectors in terms of their magnitude and angle between them. (3)
6.
a) A Cricket player throws his hands backward while catching a ball. Give the reason? (1)
b) When the bullet fired from a gun, the gun recoils freely. Which one has greater kinetic energy -
gun or bullet? Explain (2)
7. An electron of mass m moves with a uniform speed v around the nucleus along a circular path of
radius r.
a) Derive an expression for the acceleration of electron (2)
b) Explain why the speed of electron does not increase even though it is accelerated by the above
acceleration? (1)
8. Work is required to be done to lift a body from ground. Let the body be dropped from the height h
a) State the work - energy theorem (1)
b) Draw graphically, the variation of Kinetic Energy (K.E) and Potential Energy(P. E) with the
height of the body where do you find
i) The maximum P. E? ii) The maximum K. E? (2)
c) State and prove the law of conservation of energy in this case (3)
9. Moment of inertia of a thin ring of radius R about an axis passing through any diameter is 􀬵
􀬶 􀜯􀜴􀬶
a) To get the moment of inertia of the same ring about an axis passing through any tangent which of
the following theorem you can use? State the theorem
i) Perpendicular axis theorem ii) Parallel axis theorem (1 􀬵
􀬶)
b) What is the radius of gyration of the ring about an axis passing through any diameter? (1/2)
c) A thin metal ring of radius 0.25 m and mass 2 kg starts from rest and rolled down in an inclined
plane. If the linear velocity on reaching the foot of the plane is 2 m/s, calculate its rotational K.E.
(2)
10. When we throw a stone into the air it comes back to the earth. But if we increase the speed of the
stone, it may escape from the gravitational attraction of earth.
a) Explain the term escape velocity. (1)
b) The radius of the earth is reduced by 4% of its initial value. The mass of the earth remains
unchanged. What will be the percentage of change in the escape velocity. (2)
c) Assuming that planets move in circular orbits, derive Kepler’s third law on planetary motion. (2)
11. When longitudinal tension is given to a steel wire, it elongates
a) Name the law that gives the relation between applied force and elongation of steel wire. (1)
b) State the law (1)
c) Find out the load to be suspended at the end of a brass wire at length 18m to stretch it through
1mm. The diameter of the wire is 0.2m. Young’s Modulus = 20 GPa. (2)
12. When a fluid moving through a pipe of varying cross-sectional area, the sum of pressure energy, KE
per unit volume, PE per unit volume remains a constant.
a) Name the theorem underlying the statement. (1)
b) Derive an expression for the above theorem. (3)
13. A thermodynamic process is one in which the thermodynamic variable (P,V,T etc.) change
a) Name the thermodynamic process in which 􀜲􀜸􀰊= constant (1)
b) State and explain first law of thermodynamics (2)
c) Derive an expression for the work done in an adiabatic process involving an ideal gas in terms of
pressure and volume. (2)
OR
a) Which thermodynamic process is also called an iso-entropic process (1/2)
b) The efficiency of Carnot engine is 􀬵
􀬺. If on reducing the temperature of the sink by 650C its
efficiency becomes 􀬵
􀬷, find the temperature of sink and source (1 􀬵
􀬶)
c) Obtain the expression for the work done during an adiabatic process (3)
14. Vertical oscillation of loaded spring in water dies out rapidly
a) Name the type of oscillation here (1)
b) How can you maintain the oscillation of loaded spring in water? (1)
c) A girl swings in sitting position on a swing. How will the period of swing be affected,
if she stands up? (2)
15. A girl tries to find out the frequency of a turning fork using sonometer apparatus
a) What is the nature of wave produced in a sonometer (1)
b) Explain why the paper rider throws away at a particular resonating length? (2)
16. A train is approaching a station blowing its siren. A man standing on the plat form observes change
in frequency of the sound produced by the train
a) What is the phenomenon called (1)
b) Write down an expression for the apparent frequency heard by a stationary observer when the
source is approaching him with a velocity u? (1)

MODEL QUESTION PAPER PHYSICS +1

SET 6

I 1. Find the odd pair from the following .
a) Work - Energy b) Stress - Pressure
c) Force – Momentum d) Surface Tension - Surface Energy ½
2. Dimensional analysis can be used to check the correctness of an equation.
a) Name the principle which is used to correct an equation based on dimensional analysis. ½
b) Use the principle to check the following equation whether correct or not.
i) S = ut + ½ at2 ii) E = ½ mv2 + mgh iii) t = 2p Ö(g/l) 1 ½
3. If the percentage error in measurement of radius of sphere is 2% , then what is the percentage error
in the volume. 1
[ Total 3 ½ Score]
II 1. Identify the motions of:
i) a butterfly in search of nectar. Ii) a caroms coin over a board 1
2. Draw the velocity – time graph using the following data.
Time (s) 0 5 10 15 20 25
Velocity
(m/s)
2 4 6 8 10 12
What is the acceleration in the time interval 10 – 15 sec from the graph. 1 ½
4. Derive displacement –time relation using the v-t graph. 1 ½
5. The acceleration ‘a’ in m/s2 of a particle is given by a = 3t2 + 2t + 2 , where ‘t’ is the time in
seconds. IF the particle starts out with a velocity at the end of 2 sec. 1
[ Total 5 Score]
III. 1. A vector has both magnitude and direction. Identify vectors from following.
Force , Work , Time, impulse, charge. 1
2. Find the angle between two vectors of Ā = 2ĭ + 3ĵ - 4ķ and B = 4ĭ + 5ĵ - 2ķ 1 ½
3. Is the flight of a bird a practical example of parallelogram law of vector addition. Explain with a
neat diagram. 1 ½
[ Total 4 Score]
IV. A javelin is thrown by an athlet at an angle q with the horizontal.
a) Draw the velocity – time graph for the horizontal component of the velocity of the javelin. ½
b) Arrive at an expression for the maximum height reached by it. 1 ½
c) A bomb should be dropped from an aeroplane to hit the target. Why ? 1
[ Total 3 Score]
V. a) While catching a ball the cricket player draws his hands backwards. Why? 1
b) Identify the law behind this? ½
c) Driver running a three wheeler with a speed of 36 km/hr sees a child standing in the middle of
the way and breaks the vehicle to stop in 4 seconds just in time to save the child. What is the
average retarding force on the vehicle? The mass of the vehicle is 400kg and mass of the driver is
65kg. 1 ½
[ Total 3 Score]
VI. At a curved track, an inclination is given by raising the outer side a little above the innerside.
a) What is the advantage of this situation? 1
b) If the track has a curve of radius 400m and banked at an angle 50 and given coefficient of friction
as 0.2, find the optimum speed to avoid wear and tear of the tyre. 1
c) Find the maximum permissible speed to avoid skidding in the above case. 1
d) Why does a cyclist, negotiating a curve lean his bicycle? 1
[ Total 4 Score]
VII A cat is able to land on its feet when thrown in to air.
a) Name the law behind it. ½
b) State and explain it with the help of the law. 1 ½
c) A girl has to lean toward right while carrying a bag in her left hand. Why ? 1
[ Total 3 Score]
A
B
VIII. A body is dropped from the top of a tower of height ‘h’ . h
a) Derive expressions for the total energy of the body at positions A,B and C. 2
b) Arrive at a conclusion from the above findings. 1
c) Show the variation of kinetic energy and potential energy with position C
graphically. 1
[ Total 4 score ]
IX. a) A body is taken from the surface of earth to a height ‘h’ what will happen
to its weight? ½
b) Find the ratio of the weights of a body which is taken to height and depth equal to half of
the radius of earth. 2 ½
c) No fuel is required by a satellite to keep it in orbiting (neglect air resistance). Justify the
statement. 1
d) When planets come closer to the sun they move faster and if they are away move slower.
Explain the fact with the statement of law governing planetary motion. 2
[ Total 6 score ]
X. A small metal sphere is falling through a large column of caster oil.
a) Name the force acting on the sphere. ½
b) After some time the sphere is found to attain a constant velocity. Obtain an expression for this
velocity. 2
c) Why rain drops do not acquire a high velocity even though they are falling from a great
height? 1
[ Total 3 ½ score ]
XI. A sprayer spreads a perfume as tiny particles.
a) What is the principle of its working? ½
b) State the principle. 1
c) Can this principle be used to find the velocity of a rapid flow of water in a river? Explain. 1
[ Total 2 ½ score ]
XII. A gas has two specific heat capacities.
a) Define these specific heats ? 1
b) Derive Cp – Cv = R 3
c) Write the value of Cv for a diatomic gas. 1
[ Total 5 score ]
XIII.
a) A tunnel is set up through the centre of the earth and an object is dropped into it. What is the
type of the motion executed by the object. 1
b) Find the expression for the period of oscillation of a simple pendulum for small oscillation. 2
c) What is the frequency of oscillation of a simple pendulum mounted in lift falling freely under
gravity? 1
d) A man with a wrist watch on his hand falls from the top of a tower. Does the watch give correct
time during his free fall? 1
W [ Total 5 score ]
XIV. 1. Using the formula V= (g P/r ) ½ to explain why the speed of sound in air.
a) is independent of Pressure?
b) Is increasing with temperature?
c) Is increasing with humidity? 3 score
2. A stone is dropped from the top of a tower of height 300m splashes into water of a pond near
the base of the tower. How long will it take to hear the sound of splash at the top of tower.
Given speed of sound in air is 340m/s. 2 score
[ Total 5 score ]
Source
T1 K
Sink
T2 K

MODEL QUESTION PAPER PHYSICS +1

SET 5

1. Complete the equations a) 1 MW = ……… J/s b) 1 fm = …… m
c) 10-9 sec = 1 ……sec d) 100mg = …….kg 2
2. Match the following
Physical Quantity Equation Dimensional Formula
Work F. r2/m1 m2 M L-1 T -1
Gravitational Constant F dx/Adv M L T -2
Coefficient of viscosity F.d M-1 L3 T -2
3
3. If the radius of earth is shrinked by 3%, What would be the percentage change in volume ? 2
4. Rajesh was watching some fishes moving under water in an aquarium. He located positions of a
golden fish with respect to the corner point taken as an arbitrary origin.
a) Name the type of motion of fishes under water. ½
b) If the golden fish moves a straight distance of 20cm in 4 seconds and then 15 cm in 5seconds 1
determine its average speed. x (m)
c) Derive the following equations of motion for a uniformly accelerated motion.
i) vt = vo + at ii) S = vot + ½ at2 2
5. Write the principle or law behind the following facts
a) Passengers in a starting bus falling backwards
b) A cricket player draws his hands backward while catching a ball.
c) A gun recoils after firing.
d) In a nest the birds are flying with different momenta but the nets possesses zero momentum.
[ Total Score 4]
6. A spring attached with a block of mass ‘m’ is oscillating horizontally over a smooth table.
a) Name the constant associated with the spring motion. Give its unit. 1
b) State and explain the law of conservation of energy of the oscillating spring system. 3
c) Draw the energy – position graph showing variation of P.E. , K.E. and T.E. 1
[ Total Score 5]
7. Two billiard balls A and B of masses m1 and m2 moving with velocities u1 and u2. At a time they
collide elastically. After collision their velocities are changed as v1 and v2.
a) What are elastic collisions? Give one example. 1
b) Show that relative velocity is numerically conserved in elastic collision in one dimension. 2
c) Derive the final velocities of A and B after collision 2
[ Total Score 5]
8. Gopal was boasting to his friend Bhaskar “ My grandpa raised an elephant by his fore finger when a
lifting force applied at the centre of mass of elephant”.
a) Give the importance of centre of mass of a body. 1
b) Write the relation for its position, velocity and acceleration of the centre of mass. 2
c) The circus players fold their hands to adjust their angular speed of rotation. Explain the situation with
proper theoretical support. 2
[ Total Score 5]
9. Why do girders are designed to be in the form of letter ‘I’. [ Total Score 2]
10.In a continuous flow of a fluid through a pipe of varying cross section from 2 x 10-4 m2 to
5x 10-4m2. Find out the velocity of emerging fluid , if it is entering with a velocity 8 m/s . 1 ½
c) Venturimeter is used to measure the flow of a liquid through a pipe. Using the principle behind
its working derive a relation for the velocity of flow of the liquid. 3
[ Total Score 5]
11. In a resonance column the waves generated are stationary.
a) Mention how does a standing wave obtain. 1
b) Draw the wave form in a resonance column. 1
c) If the pipe open at one end is raised to a height ‘L’ it resonates, deduce the possible frequencies. 3
[ Total Score 5]
12. Simple pendulum is a system executing simple harmonic oscillations with a period T
a) Write another system in simple harmonic motion. 1
b) Obtain the relation for T. 2
c) Comment on the dependence of T on : i) length of pendulum ‘l’ and ii) mass of the bob ‘m’. 2
[ Total Score 5]
13. The working of Carnot’s heat engine is reversible.
a) If we reverse the direction of working of a heat engine, we get another device. What is it? 1
b) Explain the second law of thermodynamics . 3
c) A thermometer showed the body temperature of a person noted by a nurse as 1040F. Whether he
is suffering from fever if normal human body temperature is 380C. 2
[ Total Score 6]
OR
14. a) Mention the different modes of heat transfer. 2
b) Explain the natural phenomenon of Sea breeze and land breeze 1 ½
c) Given area of cross section of a metal rod is 2.5 m2 and conductivity of 406Wm-1 K-1 . At steady
state a temperature fall of 0.5 0C is existing over unit length. 2 ½
[ Total Score 6]

MODEL QUESTION PAPER PHYSICS +1

SET 4

2) Explain the reason for the following situations.
a. Cricketer moves his hands backwards while holding a catch.
b.The passengers in a stationary bus get thrown backward with a jerk when the
driver starts the bus suddenly.
c. Massaging is given immediately to a patient having heart attack. [1+1+1]
3 ) Two cars A & B traveling with speed 20 m/s & 10m/s respectively applies brakes,
so that
A comes to rest in 10 sec and B comes to rest in 15 Sec.
a) Draw the velocity time graph of A&B in the same graph
b) From the graph determine which of the 2 cars traveled further after brakes were
applied and by how much distance .
[2+2]
4) A frog saw an insect on the group at a horizontal distance of 30 m from it. The frog can jump
with a speed 20 m/s in any direction. It jump with this initial speed and land on the insect.
a. What is the type of motion made by the frog & Diffine.
b. Find the angle that frog’s initial velocity makes with the horizontal.
c. Find the minimum distance the insect have to keep from the frog, so that it can escape from
the frog. [2+2+2]
5.) Four person sitting in the back seat of a car at rest, is pushing on the front seat.
a. Does the car move. Why ?
b. State the law which help you to answer above question.
c. What are the significance of that law.
d. Long jumpers take a long run before the jump. Why ? [2+2+1+2]
6) A motor car traveling at 30 m/s on a circular road of radius 500m. It is increasing it’s speed at
the rate of 2m/s2.
a. What is the direction of centripetal acceleration?
(i) Along the tangent
(ii) Towards the centre
(iii) In the direction of linear velocity
(iv) In the direction of angular velocity
b. Find the Centripetal acceleration in the above case.
c. Find the total acceleration in the above case. Draw the direction of net acceleration [1+2+2]
7) Moment of inertia of a body about an axis is the sum of moments of inertia of each and every
particle of the body about the same axis.
a. What is meant by moment of inertia of a particle ?
b. Can you think of a body having the same moment of inertia for all possible axis ? If so give
an example and if not explain why this is not possible.
c. Can you think of a body that has the same moment of inertia for all axes passing through
certain point. If so give an example and indicate where the point is located. [2+1+1]
8) Moon is the only satellite of earth. Mass of moon is very much lower than that of earth.
a. Is there any difference in gravitational force of moon and earth ? Explain.
b. Deduce an equation for gravitational potential energy ?
c. A girl argues that even today if we visit moon we can see the foot steps of Neil Armstrong.
What is your opinion ? [1+2+2]
9) There is a story in Greek mythology, a stone thrown upward by the hero Hercules never comes
back.
a. What happens to the stone ?
b. Derive an expression for such a situation.
c. “A space craft consumes more fuel in going from the earth to the moon that it takes for a
returntrip”. Comment. [1+2+2]
10) a. Steel wire shows elastic properties. What you mean by elasticity.
b. Name the different modui of elasticity
c. What is the difference between pressure and stress?
d. "Steel is more elastic than rubber" comment on the statement. [1+1+2+1]
11) "Surface energy is numerically equal to surface tension"
a. Define surface tension
b. Establish the relation between surface energy and surface tension
c. "Small drops of a liquid are spherical while large drops are elliptical." Explain.
d. "What drop placed on a lotus leaf is spherical while the same drop spread on a plastic
plate". Justify? [1+1+1+2]
12) When a gas is contained in a closed vessel, it exerts pressure on the walls of the vessel.
a. It can be explained on the basis of
i) Einstein's theory of relativity
ii) Newton's laws of motion
iii) Kinetic theory of gases
iv) Bernoulli's theorem
b. Arrive at an expression for pressure exerted by a gas on the walls of the vessel.
c. How the pressure of a gas relates with the mass of its molecule. [1+2+1]
13) A boy fixed a string at one end and gave sudden jerks at the other end continuously in the up
and down directions.
a. What is the nature of the wave produced in the string and name the wave
b. Draw the wave form and explain amplitude, wave length and time period
c. A brass wire 1m long has a mass 6 x 10-3 Kg. If it is kept at a Tension 60N,
what is the speed of the wave on the wire. [1+2+1]

MODEL QUESTION PAPER PHYSICS +1

SET 3

1. Match the following
A B
(a) Force 10…..
(b) work N
(c) Micrometer M L T……
(D) Theory of relativity Thomas Alva Edison (4×1/2=2)
2. (a) If x=a+bt+ct…. Where ‘x’ is in meter and ‘t’ is in second, find the
dimensional formula of ‘b’ ? (1)
(b) The physical quantity ‘p’ is related is four observable a, b, c, & d as
{ equation} The percentage error of measurement in a, b, c, & d are
1%. 3%. 4% & 2% respectively. What us the percentage error in ‘P’.?
4. Two men are pulling a stone from to different mutually perpendicular
direction with the same force
(a) Which law can apply to find the direction of motion ?
(b) Derive an expression to find magnitude of resultant force ?
5. While firing a bullet ,like gun must be held tight to the shoulder.
(a) which law of conservation explains the recoil of gun ? (1/2)
(b) Show that recoil velocity is opposite to the muzzle velocity of the bullet (1)
(c) A gun of mass 5 kg, fire a bullet of mass 5 g, vertically upwards to a height of
100 m. calculate the recoil velocity of gun? (1)
(d) How weight is different from mass.
6. work is to be done is lift a body from the ground . Let the body be dropped
from certain height.
(a) State work –energy theorem
(b) Graphically represent the variation of KE and PE with respect to the body
(1 ½)
(c) from the graph where will you find
(1) Maximum PE and (2) Maximum KE (3)
6. Moment of inertia of a sphere about a diameter is
(a) Which is meant by moment of inertia (1)
(b) Which theorem of moment of inertia is used to calculate the moment of
inertia of sphere about a tangent AB
(c) State perpendicular axis theorem
(d) Calculate the moment of inertia of a sphere about a
tangent A B. Case necessary theorem
7.Mathematical form of perpendicular axis theorem is (a) I2-Ix+Iy………………
8. Value of g on earth varies from place to place and reduies as we go higher and
higher above the surface of earth
(1) Find the expression of ‘g’ at altitude
(2) At what height above the surface of the earth will the value of reduced to
g/4 ? (1)
(3) Derive an expression for the minimum velocity with which a satelite can
revolve around the earth in it’s orbit
(4) State- kepler’s puiodic law
11.Three moles an ideal gas kept at constant temp of 300K are compressed
from 6 litre to 2 litre
(a) which is the thermodynamic process involved ? (1)
(b) Calculate the work done required to compress ? (2)
12. The engine s of the motor vehicles convert thermal energy into
mechanical energy .They are called heat engines
a)discuss the construction and the different stages of working of a heat engine
c) Calculate the efficiency of the connot’s engine working b/w the steam
point and the …………. Point
(1)
12. A particle of mass ‘m’ Executing SHM
a) Arrive the differential equation ………………………………………. (2)
b) Arrive at an expression for tune period of a simple pendulum (3)
c) What do you mean by second’s pendulum (1)
13. consider a string stretched b/w two fixed support. A stationary wave can
be produced on the string by suitably exiting with a tuning fork.
(a)What is a stationary wave (1)
(b) Explain condition for the formation of a stationary wave
(c) Draw the fig:
………………………………………………………………………….harmonic of vibration of a
stretched string fixed at both ends (2)

MODEL QUESTION PAPER PHYSICS +1

SET 2

1. While discussing the period of oscillation of a simple pendulum, one student argues that the
period depends on mass of the bob.
a) What is your opinion?
b) How will you prove the argument dimensionally? [1+2=3]
2. The velocity – time graph of an object moving along a straight line is shown below.
a) Define uniform velocity.
b) Calculate the displacement of the object between O and 10 seconds.
c) Find the average velocity during the whole journey.
[1+2+2=5]
3. A body is fired with an average velocity of 320m/s at an angle of 30º with the horizontal.
a) What is the nature of the path of the projectile?
b) Find the time to reach its maximum height
c) Find the maximum height attained.
d) With the same velocity, what is the maximum range possible?
[1/2+11/2+11/2+11/2=5]
4. A circular track of radius 400m is kept with outer side of the track raised to make 5º with the
horizontal (Coefficient of friction= 0.2)
a) Name the track
b) What is the optimum speed to avoid wear and tear of tyre ?
c) What is the maximum speed with which the vehicle will move without skidding?[1+2+2=5]
5.
a) The velocity – time graph of an object is shown below. Find the sign of work done in the
following intervals.
10
V (m/s)
2 5 10
t (s)
E
D
C
A B
t (s)
V (m/s)
b) Two bodies of masses 1Kg and 4Kg have equal linear momenta. What is the ratio of their
Kinetic Energies? [2+3=5]
6. Moment of inertia of a ring about an axis passing through its centre and perpendicular to its
plane is MR2 where M is the mass of the body and R its radius.
a) What is meant by moment of inertia?
b) Explain the parallel axis theorem.
c) State perpendicular axis theorem.
d) Calculate the moment of inertia of a rin of mass 3Kg and radius 0.5m about a tangent in
its plane. [1+2+2+2=5]
7. When we throw a stone into air, it comes back to earth. But when we increase the speed of the
stone, it may escape from the gravitaztional field of earth.
a) What is the value of escape velocity of earth?
b) Obtain an expression for escape velocity.
c) Will a simple pendulum oscillate in an artificial satellite? [1+2+2=5]
8.
a) What is surface tension?
b) Why does a parachute descend slowly where as a stone dropped from the same height falls
rapidly?
c) What is the approximate volume strain of a cube when each edge of a cube shortens by
1%? [1+2+3=6]
9.
a) There are two wires of same material and same length while the diameter of the second
one is two times the diameter of the first one. Then what is the ratio of extension produced
in the wire by applying the same load?
b) Identify the type of modulus of elasticity in the above problem [2+1=3]
10. Thermodynamics is a branch of physics dealing with the inter-conversion of heat and energy.
a) What is meant by thermal equilibrium
b) State first law of thermodynamics.
c) State second law of thermodynamics.
11. Carnot engine is an ideal heat engine.
a) What is meant by heat engine?
b) What are the four stages of Carnot engine?
c) Obtain the equation for its efficiency.
d) Refrigerator is a heat engine. Is the statement correct? Substantiate. [1+2+1+1=5]
12.
a) While performing resonance column experiment, we can hear a cooing sound. What is the
physical concept involved in it?
b) Explain the normal modes of vibrations in the case of air in a closed pipe at both ends and
draw it graphically. [[2+2=4]

MODEL QUESTION PAPER PHYSICS +1

SET 1

1. A body is thrown vertically upward into air with an initial velocity ‘V0’
a) What will be the velocity at its maximum height. Why? (1)
b) Find the time taken to reach maximum height? (2)
c) When air resistance is taken into consideration, it is found that time of ascent is less than time of
descent. Is this statement true? Justify (2)
2. When a train traveling at a high speed with its whistle blowing, approaches to you on the platform, the
pitch of sound whistle appears to rise
a) Which is the scientific phenomenon behind it? (1)
b) State that phenomenon (1)
c) A person is standing on a railway platform. An engine while approaching the platform blow, a whistle
of pitch 660Hz. The speed of engine is 72Km/hr. Calculate the apparent pitch of whistle as heard by the
person. Velocity of sound is 340m/s. (3)
3. Modulus of elasticity of a material is the ratio of stress and strain
a) Young’s Modulus for a perfectly rigid body is------------------------ (1)
b) One end of a rope of length 4.5cm and diameter 6mm is fixed on the branch of a tree. A monkey
weighing 100N jump to catch tree. Find elongation (given Y=9.8x1011N/m) (3)
4. Two cricket balls are colliding with each other
a) Name the collision (1/2)
b) Say whether the law of conservation of kinetic energy hold good in this case. Why? (1)
c) State and prove other conservation law applicable here. (2 1/2)
5. Escape velocity of objects in a planet depends on mass and size of the planet
a) Write down the expression for escape velocity on the surface of earth (1)
b)Give reasons why the moon does not have an atmosphere around it (2)
6. a) Heat from the sun reaches the earth. Which method of heat transmission occurs in this case. (1/2)
b) Thermal conductivity of Aluminium is 205Jm-1s-1deg-1.What is meant by this (2)
c) A man wears some woolen cloth of thickness 3mm in winter. Thermal conductivity of the material of
cloth is 0.05Wm-1deg-1. If the body temperature and outside temperature are 350C and 100C
respectively, how much amount of heat is lost per square meter of the clothes from his body in one
hour? (3)
7. Water boils at 1000c and is converted into vapour
a) Which thermodynamic process involves in this statement. Explain thermodynamic process (1 1/2)
b) Obtain a mathematical formula for work done in the above thermodynamic process (2 1/2)
c) Three moles of ideal gas kept at a constant temperature of 300K are compressed from a volume of
4 litres to 1 litre. Calculate work done during this process. (2)
8. A mass is suspended at one end of a spring and the other end of the spring is firmly found at the ceiling.
If the mass is slightly depressed and released, it will execute oscillations.
a) Write down the expression for frequency of oscillation of the mass (1)
b) If the spring is cut into two equal halves and one half of the spring is used to suspend the same mass,
then obtain an expression for the ratio of periods of oscillation in two cases. (2)
c) If the system is completely immersed in water, then what happens to the oscillations? (2)
9. Give examples for the following
a) A dimensionless, unitless quantity (1/2)
b) A dimensionless physical quantity but having unit with SI system (1/2)
c) Two physical quantities which have the same dimensions (1)
10. Water cannot wet the feather of ducks. A physical quantity called angle of contact, determines
whether a liquid will spread on the surface of a solid or it will form droplets on it
a) Define angle of contact (1)
b) A wire of internal radius 3cm and external radius 3.2cm is rested on the surface of a liquid and
then raised. An extra pulling force equivalent to the weight 3.03gm is required before the film breaks than
it is after. Calculate surface tension of the liquid. (2)
c) Derive an expression for the capillary height of a liquid in a narrow tube. (3)
OR
To keep a piece of paper horizontal .You should blow over, not under it
a) Which is the principle behind it (1)
b) Stat the principle and derive it (3)
c) A cylindrical tube has a cross section of 8cm2 on one end and other end has a coss section of 12cm2. If
the liquid flows inside the tube is 0.5m/s. What is the speed of ejection of the liquid through the other
end. (2)
11. Moment of inertia of a disc about diameter is (MR2)/4. where M is the mass and R is the radius of the
disc.
a) What is the moment of inertia of the disc about a tangent in its plane (1)
b) Which theorem is used for the above calculation (1/2)
c) State the theorem (1 1/2)
12. a) State the law of equipartition of energy (1 1/2)
b) A flask contains argon and chlorine in the ratio of 2:1 by mass. The temperature of the mixture is 270C
Obtain the ratio of root mean square velocity of molecules of two gases. Atomic mass of argon=39.9U,
Molecular mass of Chlorine=70.9U (2)
13. A body is projected into the air with a velocity
a) Which component of velocity is constant throughout the projectile motion (1)
b) Obtain an expression for time of flight and horizontal range (2)
c) Find the minimum velocity with which a stone is projected in order to hit a target 20m away
(g=9.8m/s2) (2)

CHEMISTRY MODEL QUESTION PAPER

SET 5

1. Complete the following table
(3)
Volume at STP No. of moles Mass in gms
100 ml CO2 ------ ------
------ 0.5 mole of N2 -------
-------- ---------- 20 g of CH4
2. Emission spectrum or absorption spectrum is used as a finger print of an atom.
a. Give one difference between absorption and emission spectrum (1)
Yellow light emitted from a Na lamp has a wavelength ( λ ) of 550nm. Calculate the frequency
and waves of yellow light (2)
b. Illustrate Pauli’s exclusion principle with electronic configuration of ‘N’ atom. (2)
3. The hybridization of carbon in ethane,ethane and ethyne are different.
a. What is hybridization?
b. What are the different hybridization of carbon in ethane,ethane and ethyne (3)
4. Quantitative measure of tendency of element to lose electron is Ionization energy
a. Ionization energy of Nitrogen is greater than Oxygen. Why? (2)
b. Ionization energy decreases regularly down the group of periodic table.Why ?
5. VSEPR theory is used to determine the shape of molecule
a. Write the no. of bond pairs of electrons and lone pair electrons in NH3 molecule. (2)
b. o-nitrophenol is steam volatile where as p-nitrophenol is not. Justify your
Answer giving reason. (1)
6. The volume of air bubbles gradually increases as it rises up from the bottom of An aquarium.
a. Name and state the gas law that explains this phenomena. (2)
b.Can oxygen exist as a gas at -273.15º C. Write the significance of this temperature (2)
7 a. Calculate the eathalpy of formation of CO from C using the following data.
i) C + O2 􀃠 CO2, ΔH = -393.5 kj/mol.
ii) CO + ½ O2 􀃠 CO2, ΔH = 283 kj/mol (2)
8. Select the odd one out of the following set
a. Temparature, Pressure, Density (intensive property)
b. Human body , earth , water in a closed vessel (type of system)
c. Internal energy, work, enthalpy, entropy (state function) (3)
9. A redox reaction involves a simultaneous oxidation half reaction and a reduction half reaction
a. Write the electronic concept of oxidation and reduction: (1)
b. Identify the oxidising Agent and reducing agent in the following reaction.
Zn + CuSO4 􀃠 ZnSO4 + Cu (2)
10. A sample of hard water was found to lose its hardness on boiling. Explain the type of hardness.
(3)
11. a, K2CO3 cannot be prepared by solvay process. Why ?
(2)
b. A solution of Na2CO3 is alkaline. Why ? (2)
12. a, Graphite conduct electricity while diamond doesn’t Explain why?
(2)
b. Distinguish between silicons and silicates (2)
13. Hydrates of boron is called boranes. Discuss the structure and preparation of Diborane
(3)
14. Give the IUPAC name of
a. CH3 - CH2 – CH2 - CH2 – CH2 – COOH
b CH3 – CH – CH = CH2
CH3 (2)
15. Lassaignes’s test used to detect the N,P,S and X in organic compound. Discuss
The chemistry of Lassaigne’s test .
16. Addition of HBr to 3-methyl -1-butene yields a mixture of two alkyl bromides.
i. Write the structure of IUPAC name of those compounds. (2)
ii. Which is the major product in the reaction. Why ? (2)
17. Bayer’s test is used to detect unsaturation in organic compound ?
a. What is Bayer’s Reagent (1)
b. What is the product formed when ethylene treated with Bacyer’s regent. (2)

CHEMISTRY MODEL QUESTION PAPER

SET 4

1. When 2 g of H2 reacts with 32 g of O2 to form water. Hydrogen acts as limiting reagent.
a) What is a limiting reagent ? (1 Score)
b) Find the limiting reagent when 10 g of N2 reacts with 5g of H2. Find the mass of product
formed. Also find the limiting reagent (3 Scores)
OR
2. When sulphur reacts with oxygen two types oxides can be formed.
a) Explain which law of combination is applied here. (2 Scores)
b) Calculate the number of moles in the following.
i) 4g of CH4 ii) 12g of NaOH (2 Scores)
3. Chemical properties of an element is explained by its electronic configuration.
a) Give the electronic configuration of nitrogen. Name the principle behind this. (2 Scores)
b) Write the quantum number values of the valence electron of K. (1 Score)
c) What are the conclusions of Rutherford ‘s scattering experiment? (2 Scores)
4. The first ionization enthalpy value of group 13 elements are
B Al Ga In Tl
801 577 579 558 589
How would you explain this variation from the general trend? (3 Scores)
OR
5. Consider the following species
N3-,O2-, F-,Na+, Mg2+ and Al3+
a) What are iso electronic species? (1 Score)
b) Arrange the above species in the increasing order of their ionic radii ? (2 Scores)
6. Stability of a molecule can be explained by bond order.
a) Calculate the bond order of the following and discuss their stability.
i)He2 ii) O2
- (3 Scores)
b) Although geometries of NH3 and H2O molecules are distorted tetrahedral bond angle in
water is less than that of ammonia . Give reason. (2 Scores)
8. a) Calculate the standard enthalpy of formation of CH3OH(l) from the following data:
OR (3 Scores)
b) The reaction of cyanamide , NH2CN(s) ,with dioxygen was carried out in a bomb
calorimeter ,and ΔU was found to be – 742.7 KJ/mol at 298 K .Calculate the enthalpy
change for the reaction at 298 K.
NH2CN(g) + 3/2 O2(g) N2(g) + CO2 (g) + H2O(l) (3 Scores)
c) Give the relation between Gibbs energy change, enthalpy change and
temperature. (1 Score)
9. Blood is an example for buffer solution.
a) Explain the classification of buffer solution with suitable example (3 Scores)
b) Identify the conjugate acid – base pairs from the following reaction
(2 Scores)
c) Define PH of a solution (1 Score)
10. Redox reaction is one in which oxidation and reduction occurs simultaneously
a) Give an example for a redox reaction and Identify the oxidising and educing agent
(3 Scores)
b) Write the oxidation numbers of the under lined elements in the following.
i ) Mn O4
- ii) H2 S O4 (1 Score)
11. Heavy water is used in nuclear reactors.
a) Differentiate between ordinary water and heavy water. (1 1/2 Scores)
b) Classify the following hydrides
NH3, CaH2, CH4, NaH, NiH0.6- 0.7,LaH3 (1 1/2 Scores)
12. Gypsum and Plaster of Paris are Calcium sulphates.
a) How do they differ from each other. (1 Score)
b) Explain the preparation of plaster of paris (2 Scores)
13. Match the following.
A B C
Silicones B2H6 Water repellent
Borazine (R2SiO)n Cement
Silicates B3N3H6 Banana bond
Diborane SiO4
4- Inorganic benzene
(4 Scores)
14. Organic compounds exhibit isomerism
a) Give two conformational isomers of ethane (2 Scores)
OR
b) Give two stereo isomers of but-2-ene (2 Scores)
c) Give the IUPAC names of the following
i)
ii) (2 Scores)
d) How can you separate a mixture containing an orange and blue dye(2 Scores)
15. Complete the following reactions.
a) 2CH3CH2Br +2 Na ether
b) CH3CH2Br + Zn HCl
c) (3 Scores)
16. How are the following conversions carried out
i) Benzene to nitro benzene
ii) Butane to 1-bromo butane
iii) Ethanoic acid to methane (3 Scores)

CHEMISTRY MODEL QUESTION PAPER

SET 3

1 Copper oxide is obtained by heating copper carbonate or copper
nitrate contains Copper and Oxygen in the same ratio by weight
a) Which law is illustrated by this observation? 1
b) State the law. 2
2 a) Critical temperature of carbon dioxide and methane are
30.98 oC respectively. Which of these has strong intermolecular force
and why? 2
b) In terms of Charle’s, explain why -273 oC is the lowest possible
temperature. 2
3 a) Write the quantum numbers for the valence electrons of potassium
(19K). 3
b) Calculate the de Broglie wavelength of a body with mass 1 g
travelling at a velocity of 1.0 ms-1 2
c) State Heisenberg’s uncertainty principal. 2
4 The ionisation enthalpy increases from left to right in a period.
a) The ionisation enthalpy of Nitrogen and Oxygen is in the order
N > O. Why? 2
b) Arrange the following ions in the decreasing order of ionic radii.
Mg2+, N3-, F-, Na+, Al+, O2-. 3
5 a) Define bond order? 2
b) Ne2 molecule doesn’t exist. Why? 2
c) The shape of H2O molecule is bent. 2
6 Define entropy? 1
For the melting of ice at 25 oC, H2O (S)  H2O (l), The enthalpy of
fusion is 6.97 kJ mol-1 and entropy of fusion is 25.4 J mol-1K-1.
Calculate the Gibbs energy change and predict whether the process
is spontaneous or not at this temperature. 3
7 a) What are the conditions for getting maximum yield of ammonia?
Why? N2 + 3H2  2NH3 ΔH = -92.4kJ. 3
b) Classify the following compound as Lewis acids and bases.
FeCl3, BF3, NH3, Cl- 2
8 a) Assign oxidation number of the underlined elements
1. KMnO4 2. NaBH4 1
b) Justify that the following reaction is a redox reaction
CuO(S) + H2(g)  Cu(S) + H2O(g) 2
9 a) What causes the temporary and permanent hardness of water? 2
b) Explain one method for the removal of permanent hardness. 2
10 a) What is washing soda? How is it prepared? 3
b) Draw the structure of BeCl2 in vapour phase. 1
11 a) Classify the following oxides as neutral, acidic, basic or
amphoteric. CO, B2O3, SiO2, CO2, Al2O3 2
b) Give reasons.
1) Graphite is used as lubricant
2) Conc. HNO3 can be transported in aluminium containers. 2
12 a) Write the IUPAC name of the following.
1) Cl2CHCH2OH 2) CN
2
b) Which of the following carbocation is the most stable?
(CH3)3CC+H2, (CH3)3C+, CH3CH2C+H2, CH3C+HCH2CH3 1
c) Explain the chemistry of Dumas method. 1
13 a) Explain Markovnikov rule with suitable example. 3
b) Why benzene extra ordinarily stability though it contain 3 double
bonds? 2

CHEMISTRY MODEL QUESTION PAPER

SET 2

1. One gram mole of a substance contains 6.023 x 1023 molecules
a) Find out the number of molecules in 2.8 g of Nitrogen (1)
b) Which is heavier, one SO2 molecule or one CO2 molecule (1)
c) Under identical conditions of temperature and pressure, equal volume of
all gases contains equal number of molecules. Name the law (1)
d) An organic compound contain 52.2% Carbon, 13 % hydrogen and the rest Oxygen.
Find the empirical formulae of the compound (2)
2. a) The electronic configuration of an element with atomic number 7 is given below
1S2 2S2 2Px
2 2Py
1 2Pz
0
Do you agree with the above configuration. Justify (2)
b) Sketch the shape of S and P orbitals (1)
c) Write down the values of n, l, m and s for an electron in 3d orbital (1)
3. a) The properties of the elements are periodic functions of their atomic number.
Name the law. (1)
b) Which is bigger Cl or Cl- Why? (2)
4. a) Fill in the blanks (2)
Molecule
Hybridisation Shape
CH4 …………….. Tetrahedral
PCl5 SP3d ……………
BeF2 Sp ……………
………….. SP2 Trigonal Planar
b) Bond order gives an idea about the stability of the molecule. Calculate the bond order
of the following species and arrange them in the increasing order of bond length
O2, O2
+, O2
- (3)
OR
5. a) Using VSEPR theory explain the shape of Water molecule (2)
b) H2O is a liquid, while H2S is a gas a room temperature. Why? (1½ )
c) Which has higher dipolemoment NH3 or NF3? Why? (1½ )
6. a) Give vanderwaal’s equation and explain the terms. (2)
b) Arrange in the increasing order of viscosity
Honey, water, kerosene (1)
c) How is viscosity dependent on temperature (1)
7. a) Energy of an isolated system always remains constant.
Write the mathematical equation for the first law of thermodynamics (1)
b) Entropy of water is higher than that of ice. Give reason (1)
c) Classify the following as Extensive and Intensive properties
Temperature, Internal energy, density. Enthalpy (2)
8. a) PCl5 à PCl3 + Cl2 ΔH = negative.
What is the effect of temperature and pressure on the above equilibrium (2)
b) Write the conjugate acid – base pair
HCO3
-, HS- (2)
c) What happens when HCl gas is passed through a saturated solution of NaCl?
Which is the effect behind it? Define. (2)
9. a) Calculate the oxidation state of underlined atom
KMnO4, Cr2O7, H2S, NH3 (2)
b) Identify the oxidizing and reducing agent
CuS + O2 à Cu + SO2
c) In the above equation which has undergone oxidation and reduction (1)
10. a) Name the different types of Hydrides (1)
b) Name the isotopes of Hydrogen (1)
c) What is permanent hardness? How can it be removed? (2)
11. a) What are the similarities between Li and Mg? (2)
b) What is washing soda? How can it be prepared? (3)
12. a) What do you understand by (i) inert pair effect (ii) Catenation (2)
b) Explain the structure of Diborane (2)
13. a) Write the IUPAC names of the following compounds
(i) CH3 CO CH2 CH2 CH2 COOH
(ii) CH ≡ C ─ CH = CH ─ CH3 (2)
b) Name the test used (i) to detect the presence of Nitrogen in an organic compound (1)
(ii)to estimate Nitrogen in an organic compound. (1)
14. a) Complete the following (2)
(i) CH3 ─ CH = CH2 + HBr à ……………………………
(ii) 2CH3 ─ Cl + Na à ………… + …………….
b) Represent the two geometrical isomers of 2- butane (2)
c) How will you convert benzene to Nitro benzene (1)
15. a) What is photochemical smog? How can it be controlled? (1)
b) What is BOD ? (1)

CHEMISTRY MODEL QUESTION PAPER

SET 1

1. a. State the Law of Multiple Proportions (1)b. Among molarity and molality which is temperature dependent. (1)c. Calculate the mass percentage of all elements present in CaSO4 (2)2. Dual nature of matter was proposed by Louis De Broglie.a. Calculate the de Broglie wavelength associated with an electron with velocity 1.6X106ms-1 (3)b. State Paulis exclusion principle and Hunds rule of maximum multiplicity (3)3. a. Define Ionisation energy. Explain its variation along a period (2)b. What are representative elements? Write their general electronic configuration. (2)4. Bond order gives an idea about stability of a moleculea. Calculate the bond order of N2 molecule (2)b. Explain sp3 hybridisation using a suitable example (2)c. Draw the Lewis structures of BeF2 and H2S (1)5. a. Write any two postulates of kinetic theory of gases (2)b. Why mercury drops are spherical in shape? (1)c. Write Vander Waals equation for ‘n’ moles of a gas (1)6. a. Classify the following properties into extensive and intensiveVolume, Pressure, Temperature, Internal energy (2)b. What are the criteria for spontaneity of a reaction? (2)7. a. Classify the following as Lewis acids and bases.H2O, BF3, H+, NH4+ (2)b. pH of milk is 6.8. Calculate the concentration of H+ in it. (1)c. Predict whether the following salts are acidic, basic or neutral.KCl, NH4NO3, KF, CH3, COONa. (2)8. Calculate the odidation number ofa. 1. K in KMnO4. 2. P in H4P2O7 3. C in CO2 (1.5)b. Identify the oxidant and the reductant in the following reactions1. 2 Zn + O2  2 ZnO2. Zn + 2H+  Zn2+ + H2 (1.5)9. a. What are the causes of temporary and permanent hardness of water? (2)b. Using suitable examples show that water is amphoteric in nature. (2)10. a. Write the formula of : Gypsum, Washing Soda, Caustic Soda, Baking Soda (2)b. Explain the diagonal relationship with an example (2)11. a. Hybridisation of B in diborane is ____________ (1)b. CCl4 is not hydrolysable where as SiCl4 is hydrolysable. Why? (2)c. _________ is known as dry ice. (1)12. a. Draw the structures of :1. 2,2-dimethylpentane2. but-3-yn-1-ol3. 2-chloro-4-methyl pentane (3)b. Write the bond line representation of:1. Heptan-4-one2. 2,2-dimethyl butanol (2)c. Name the isomerism exhibited by CH3COOCH3 and CH3CH2OH (1)13. Complete the following.a. Anh.AlCl31. Benzene + CH3Cl ----------> ____________ + HClAnh.AlCl32. Benzene + 6Cl2 -------------> ____________ + 6HClDark (3)b. Write two examples for orthopara directing groups (1)c. Draw cis and trans isomers of CHCl=CHCl (1)14. a. What is Smog?b. What is BOD ?c. Write any two causes of water pollution. (3)