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]