General Science #39 Multiple Choice Questions (MCQ) : Assam Jobs Guide

GENERAL SCIENCE #39

MULTIPLE CHOICE QUESTIONS

General Science : Multiple Choice Questions (MCQ) : Assam Jobs Guide

1. When a body falls freely towards the earth, then its total energy ……………

(a) increases

(b) decreases

(c) remains constant

(d) first increases and then decreases

Answer: (c)

2. A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car ……………

(a) does not change

(b) becomes twice to that of initial

(c) becomes 4 times that of initial

(d) becomes 16 times that of initial

Answer: (a)

3. In case of negative work the angle between the force and displacement is …………

(a) 0°

(b) 45°

(c) 90°

(d) 180°

Answer: (d)

4. An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass is 3.5 kg. Both spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same ……………

(a) acceleration

(b) momentum

(c) potential energy

(d) kinetic energy

Answer: (a)

5. A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. The work done against the gravitational force will be ………… (g = 10 ms²)

(a) 6 × 10³ J

(b) 6 J

(c) 0.6 J

(d) zero

Answer: (d)

6. Which one of the following is not the unit of energy?

(a) Joule

(b) Newton metre

(c) Kilowatt

(d) Kilowatt hour

Answer: (c)

7. The work done on an object does not depend upon the ……………

(a) displacement

(b) force applied

(c) angle between force and displacement

(d) initial velocity of the object

Answer: (d)

8. Water stored in a dam possesses ……………

(a) no energy

(b) electrical energy

(c) kinetic energy

(d) potential energy

Answer: (d)

9. A body is falling from a height h. After it has fallen a height h/2, it will possess

(a) only potential energy

(b) only kinetic energy

(c) half potential and half kinetic energy

(d) more kinetic and less potential energy

Answer: (c)

10. The number of joules contained in 1 kWh is ……………

(a) 36 × 105 J

(b) 3.6 × 107 J

(c) 36 × 108 J

(d) 3.7 × 107 J

Answer: (a)

11. Two army persons A and B each of weight of 500 N climb up a rope through a height of 10 m. A takes 20 s while B takes 40 s to achieve this task. What is ratio of the powers of person A and B?

(a) 1 : 2

(b) 1 : 4

(c) 2 : 1

(d) 14 : 1

Answer: (c)

12. If speed of a car becomes 2 times, its kinetic energy becomes ……………

(a) 4 times

(b) 8 times

(c) 16 times

(d) 12 times

Answer: (a)

13. Work done by friction ……………

(a) increases kinetic energy of body

(b) decreases kinetic energy of body

(c) increases potential energy of body

(d) decreases potential energy of body

Answer: (b)

14. When a coil spring is compressed, the work is done on the spring. The elastic potential energy ……………

(a) increases

(b) decreases

(c) disappears

(d) remains unchanged

Answer: (a)

15. One joule work is said to be done when ……………

(a) a force of 1 N displaces a body by 1 cm

(b) a force of 1 N displaces a body by 1 m

(c) a force of 1 dyne displaces a body by 1 m

(d) a force of 1 dyne displaces a body by 1 cm

Answer: (b)

16. What is the SI unit of power?

(a) Watt

(b) Joule

(c) Newton

(d) Metre

Answer: (a)

17. Mechanical energy of a body includes ……………

(a) kinetic energy only

(b) potential energy only

(c) kinetic energy and potential energy

(d) None of the above

Answer: (c)

18. What is the commercial unit of energy?

(a) Joule

(b) KWh

(c) Watt

(d) Newton

Answer: (b)

19. Potential energy of a body depends on its ……………

(a) position

(b) configuration

(c) position and configuration

(d) mass and velocity

Answer: (c)

20. Work done is product of ………….. and distance moved the direction of the force.

(a) force

(b) time

(c) acceleration

(d) force, time

Answer: (a)

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