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CHHANDAK SIR PHYSICS CLASSES
CODE-ADM/CSPC3
1. Mark the correct statements (s)
(a) Friction force is invariant in nature.
(b) Tension in string is an example of electromagnetic force.
(c) One can’t imagine a force in the absence of a physical object on which it is exerted.
(d) All of the above.
2. A block of mass 80 kg is to be lowered with the help of string whose breaking strength is 500 N. The minimum
acceleration with which the task would be performed so that string won’t break is [Take g = 10 m/s 2]
(a) 3.75 m/s2
(b) 16.25 m/s2
(c) 5 m/s2
(d) 10 m/s2
3. A body rolls down an inclined plane. If its kinetic energy of rotation is 40% of its kinetic energy of translation,
then the body is,
(a) solid cylinder
(b) solid sphere
(c) disc
(d) ring
4. In elastic collision
(a) both momentum and kinetic energies are conserved.
(b) both momentum and kinetic energies are not conserved.
(c) only energy is conserved.
(d) only mechanical energy is conserved.
5. An object is projected at an angle of 450 with the horizontal. The horizontal range and maximum height reached
will be in the ratio:
(a) 1:2
(b)2:1
(c) 1:4
(d) 4:1
6. A uniform metal chain is placed on a rough table such that one end of it hangs down over the edge of the table.
When one-third of its length hangs over the edge, the chain starts sliding. Then the coefficient of static friction
(a) 3/4
(b) 1/4
(c) 2/3
(d) 1/2
7. A player caught a cricket ball of mass 150g moving at the rate of 20m/s. If the catching process be completed in
0.1sec, the force of the blow exerted by the ball on the hands of the player is,
(a) 0.3N
(b) 30N
(c) 300N
(d) 3000N
8. A wire can be broken by applying a load of 200N. The force required to break another wire of the small length
and same material, but double in diameter.
(a) 200N
(b) 400N
(c) 600N
(d) 800N
9. The acceleration experienced by a moving boat after its engine is cut off, is given by a = - kv3, where k is a
constant. If v0 is the magnitude of velocity at cut off, then the magnitude of the velocity at time t after the cut off is,
𝑣
𝑣0
𝑣0
𝑣0
(a) 0
(b)
(c)
(d)
2
2𝑘𝑡𝑣0
1+2𝑘𝑡𝑣0
√1−2𝑘𝑣02
√1+2𝑘𝑡𝑣02
10.A passenger train is moving at 5m/s. An express train is travelling at 30m/s, on the same track and rear side of the
passenger train at some distance. The driver in the express train applied brakes to avoid collision. If the retardation
due to brakes is 4m/s2, the time in which the accident is avoided after the application of brakes is,
(a) 4.25s
(b) 5.25s
(c) 6.25s
(d) 7.25s
11. Two bodies A and B having masses in the ratio of 3:1, posses the same K.E. The ratio of the linear momentum
of B to A is:
(a) 1:3
(b) 3:1
(c) 1: √3
(d) √3 :1
12. The motor of an electrical train can give it an acceleration of 1m/s 2 and brakes can give a negative acceleration
of 3m/s2 . The shortest time in which the train can make a trip between two stations 1215m apart is,
(a) 14.2s
(b) 28.4s
(c) 56.8s
(d) 113.6s
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13. A rod is 8m wide. Its radius of curvature is 40m. The outer edge is above the lower edge by a distance of 1.2m.
This rod is most suited for a velocity of:
(a) 5.7m/s
(b) 7.7m/s
(c) 36.1m/s
(d) 9.7m/ s
14.A person aims a gun at a bird from a point, at a horizontal distance of 100m. If the gun can impart a speed of
500m/s to the bullet, at what height above the bird must he aim his gun in order to hit it? (g = 10m/s 2)
(a) 10cm
(b) 20cm
(c) 50cm
(d) 100cm
15. The height y and distance x along the horizontal plane of a projectile on a certain planet (with no surrounding
atmosphere) are given y = (8t – 5t2) m and x = 6t m, where t is in second. The angle with the horizontal at which the
projectile is projected, is:
3
4
3
(a) tan−1 ( )
(b) tan−1 ( )
(c) sin−1 ( )
(d) unpredictable
4
3
4
16. A force of 5N gives a mass M1 acceleration equal to 8m/s2 and M2 an acceleration equal to 24m/s2. What is the
acceleration, if both masses are tied together?
(a) 16m/s2
(b) 6 m/s2
(c) 12 m/s2
(d) 4 m/s2
17. A bullet is fired by a light rifle and the other with a heavy rifle by the same force. Which rifle will cause more
injury to the shoulder?
(a) light rifle
(b) Heavy rifle
(c) Both will cause the same injury
(d) The information is insufficient
18. The displacement x and time t for a particle are related to each other as t= √𝑥 +3. What is work done in first 6s of
its motion?
(a) 6J
(b) Zero
(c) 4J
(d) 2J
19. A ball falls vertically on to a floor, with momentum p, and then bounces repeatedly, the coefficient of restitution
is e. The total momentum imparted by the ball to the floor is:
𝑝
1+𝑒
1
(a) p(1+e)
(b)
(c)p( )
(d)p(1- )
1−𝑒
1−𝑒
𝑒
20.The magnitude of resultant of two equal forces is equal to either of two forces. The angle between forces is:
𝜋
2𝜋
𝜋
3𝜋
(a)
(b)
(c)
(d)
3
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ANSWERS
1. (D)
2.(A)
3.(B)
4.(A)
5.(D)
6.(D)
7.(B)
8.(D)
9.(D)
10.(C)
11.(C)
12.(C)
13.(B)
14.(B)
15.(B)
16.(B)
17.(A)
18.(B)
19.(C)
20.(B)
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