# PHYSICS QUESTIONS AND ANSWERS (7)

1. ​​ I. The earth is not spherical but elliptical in shape
II. Variation in latitude and longitude
III. Rotation of the earth on its axis
IV. Variation in the density of the earth

On which combination of the above does the weight of an object vary on the earth's surface?
A. I, II, III and IV
B. II, III and IV only
C. I, II and III only
D. I and II only

2. A rocket burns fuel at the rate of 10kgs-1 and ejects it with velocity of 5 x 103ms-1. The thrust exerted by the gas on the rock is
A. 2.5 x 10
7N
B. 5.0 x 10
4N
C. 5.0 x 10
2N
D. 2.0 x 10
-3N888

3. The force experienced by an object of mass 60.0kg in the moon's gravitational field is 1.002 x 102N. What is the intensity of the gravitational field?
A. 0.60Nkg
-1
B. 1.67Nkg
-1
C. 6.12 x 10
2Nkg-1
D. 9.81ms
-2

4. An object is projected for the height of 80 m above the ground with a velocity of 40ms-1 at the angle of 30° to the horizontal. The time of flight
A. 8 s
B. 4 s
C. 16 s
D. 10 s

5. The motion of smoke particles from a chimney is typical of?
A. random motion
B. circular motion
C. rotational motion
D. oscillatory motion

6. If the radius of the earth is 6.4 x 106m, the escape velocity of a satellite from the earth is?
[g = 10 ms
-2]
A. 1.13 x 10
4 ms-1
B. 9.00 x 10
3 ms-1
C. 8.00 x 10
3 ms-1
D. 1.27 x 10
4 ms-1 7. In the figure above, the coefficient of static friction is 0.5. If the tension in the string is T, the acceleration of the system in motion is
A. 5 ms
-2
B. 15 ms
-2
C. 3 ms
-2
D. 9 ms
-2

8. A car moves with an initial velocity of 25 ms-1 and reaches a velocity of 45 ms-1 in 10s. what is the acceleration of the car?
A. 2 ms
-2
B. 5 ms
-2
C. 20 ms
-2
D. 25 ms
-2467

9. The surfaces of conveyor belts are made rough so as to
A. protect them while carrying loads
B. prevent the loads from slipping
C. enable them to carry more load
D. make them stronger

10. A force F required to keep a 5 kg mass moving round a cycle of radius 3.5 m at a speed of 7 ms-1. What is the speed, if the force is tripled?
A. 4.0 ms
-1
B. 6.6 ms
-1
C. 12.1 ms
-1
D. 21.0 ms
-1560

11. A body of mass 4 kg resting on a smooth horizontal plane is simultaneously acted upon by two perpendicular forces 6N and 8N. Calculate the acceleration of the motion
A. 2.5 ms
-2
B. 3.0 ms
-2
C. 4.0 ms
-2
D. 4.5 ms
-2

12. A car accelerates uniformly from rest at 4 ms-2. How far will it travel in the fifth complete second?
A. 100 m
B. 50m
C. 32 m
D. 18 m
573

13. A body of mass 12kg traveling at 4.2ms-1 collides with a second body of mass 18kg at rest. Calculate their common velocity if the two bodies coalesce after collision
A. 1.5 ms
-1
B. 1.4 ms
-1
C. 2.1 ms
-1
D. 1.7 ms
-1

14. Which type of motion do the wheels of a moving car undergo?
A. Vibratory and translational motion
B. Random and translational motion
C. Rotational mand oscillatory motion
D. Translational and rotational motion
603

15. A car accelerates uniformly from rest at 3ms-2. Its velocity after traveling a distance of 24m is
A. 12ms
-1
B. 144ms
-1
C. 72ms
-1
D. 36ms
-1604

16. Calculate the escape velocity of a satellite launched from the earth's surface if the radius of the earth is 6.4 x 106m
A. 25.3kms
-1
B. 4.2kms
-1
C. 4.0kms
-1
D. 11.3kms
-1605

17. An object of weight 8kg on earth is taken to a planet where acceleration due to gravity is one-third of its value on earth. The weight of the object on the planet is
A. 48N
B. 12N
C. 27N
D. 36N

18. A bullet fired at a wooden block of thickness 0.15m manages to penetrate the block. If the mass of the bullet is 0.025kg and the average resisting force of the wood is 7.5 x 103N, calculate the speed of the bullet just before it hits the wooden block.
A. 450ms
-1
B. 400ms
-1
C. 300ms
-1
D. 250ms
-1

19. The distance xm travelled by a particle in time t seconds is described by the equation x = 10 + 12t2, Find the average speed of the particle between the time interval t = 2s and t = 5s
A. 60 ms
-1
B. 72 ms
-1
C. 84 ms
-1
D. 108 ms
-1770

20. A 5kg block is released from rest on a smooth plane inclined at an angle of 30o to the horizontal. What is the acceleration down the plane? [g = 10ms-2]
A. 5.0 ms
-2
B. 5.8 ms
-2
C. 8.7 ms
-2
D. 25.0 ms
-2

1. A

2. B

3. A

4. D

5. A

6. C

7. C

8. A

9. C

10. D

11. C

12. B/D

13. C

14. B

15. BONUS

16. B

17. A

18. C

19. D

20. A

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