Work and Energy – MCQ’s

MCQ’s
Chapter 6 – Work & Energy
Class 9 Physics Notes
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Work and Energy – MCQ’s

  1. Product of force and distance covered in the direction of force is:

(a) Acceleration

(b) Resistance

(c) Work ✓

(d) Specific heat

  1. For work ———– conditions should be fulfilled:

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(a) 1

(b) 2   ✓

(c) 3

(d) 4

  1. Work is ————— quantity:

(a) Scalar  ✓

(b) Vector

(c) Base

(d) None of above

  1. Unit of work is:

(a) N

(b) Nm

(c) J

(d) Both b & c ✓

  1. Work done will be ———— if no force act on the body:

(a) Maximum

(b) Minimum

(c) Zero   ✓

(d) All of above

  1. Work done will be maximum if displacement is ———– to force:

(a) Parallel   ✓

(b) Perpendicular

(c) Tangent

(d) Normal

  1. Work done will be zero if displacement is ———– to force: (LHR 2016)

(a) Parallel

(b) Perpendicular   ✓

(c) Tangent

(d) Normal

  1. Work done will be one ———- if a force of one Newton acts on the body and it covers the distance of 1 meter in the direction of force:

(a) Watt

(b) Joule ✓

(c) Newton

(d) Coulomb

  1. One Mega joule is equal to: (LHR 2011)

(a) 106 J    ✓

(b) 103 J

(c) 109 J

(d) 102 J

  1. What will be the magnitude of work if a force of 25 N pulls a stone through a distance of 5 m in its direction:

(a) 25 J

(b) 50 J

(c) 75 J

(d) 125 J ✓

  1. Which unit is equal to kgm2s-2 in the units given below:

(a) Joule  ✓

(b) Newton

(c) Watt

(d) Meter

  1. Rate of doing work with respect to time is known as: (LHR 2016)

(a) Energy

(b) Power   ✓

(c) Momentum

(d) None of above

  1. Unit of power is:

(a) Watt ✓

(b) Joule

(c) Newton

(d) Coulomb

  1. How much power is used by a 40 kg athlete by climbing 10m high ladder in 10 s:

(a) 4 W

(b) 40 W

(c) 400 W ✓

(d) 4000 W

  1. What will be the power of a machine doing 10 J work in 5 seconds?

(a) 2 W  ✓

(b) 10 W

(c) 25 W

(d) 50 W

  1. Ability of a body to do work is known as: (LHR 2011)

(a) Force

(b) Momentum

(c) Power

(d) Energy ✓

  1. There are ———- basic kinds of energy:

(a) 1

(b) 2 ✓

(c) 3

(d) 4

  1. Energy is ——— quantity:

(a) Vector

(b) Scalar    ✓

(c) Base

(d) None of above

  1. Unit of Energy in System International is:

(a) Watt

(b) Joule   ✓

(c) Newton

(d) Coulomb

  1. Energy possessed by a body due to its motion is called ———- energy:

(a) Kinetic      ✓

(b) Potential

(c) Mechanical

(d) All of above

  1. A bowler during playing cricket throws a ball of mass 200 g with a velocity of 20 ms-1. Its kinetic energy will be:

(a) 4 J

(b) 40 J ✓

(c) 400 J

(d) 4000 J

  1. What will be the kinetic energy of a body if its velocity is doubled? (GRW 2011)

(a) Doubled

(b) Four times ✓

(c) Eight times

(d) Half

  1. What will be the kinetic energy of a body if its mass is doubled?

(a) Doubled   ✓

(b) Four times

(c) Eight times

(d) Half

  1. What will be the kinetic energy of a car of mass 1000 kg moving with a velocity of 20 ms–1?

(a) 2 x102 J

(b) 2 x103 J

(c) 2 x105 J  ✓

(d) 2 x107 J

  1. Ability of a body to do work due to its position is called ——— energy: (LHR 2011)

(a) Kinetic

(b) Potential ✓

(c) Mechanical

(d) All of above

  1. Ability of a body to do work due to its height from the surface of earth is called _________energy:

(a) Gravitational Potential   ✓

(b) Elastic Potential

(c) Chemical Potential

(d) Attraction

  1. When a ball is lifted to a height ‘h’ from the ground, it will posses ——energy:

(a) Kinetic

(b) Gravitational potential ✓

(c) Elastic potential

(d) Mechanical

  1. Total energy of the system:

(a) Increases

(b) Decreases

(c) Remains same ✓

(d) All of above

  1. For movement of our body ———— energy is used:

(a) Heat

(b) Electrical

(c) Chemical

(d) Mechanical ✓

  1. 1 hp =

(a) 726 W

(b) 736 W

(c) 746 W ✓

(d) 756 W

  1. For the propagation of signals in our body ———- energy is used:

(a) Heat

(b) Electrical ✓

(c) Chemical

(d) Mechanical

  1. For maintaining the body temperature ———— energy is used:

(a) Heat    ✓

(b) Electrical

(c) Chemical

(d) Mechanical

  1. Increase in K.E is equal to:

(a) Increase in P.E

(b) Decrease in P.E   ✓

(c) No effect

(d) Both a & b

  1. Increase in P.E is equal to:

(a) Increase in K.E

(b) Decrease in K.E   ✓

(c) No effect

(d) Both a & b

  1. Decrease in K.E is equal to:

(a) Increase in P.E    ✓

(b) Decrease in P.E

(c) No effect

(d) Both a & b

  1. Decrease in P.E is equal to:

(a) Increase in K.E   ✓

(b) Decrease in K.E

(c) No effect

(d) Both a & b

  1. A motor lift a weight of 5N up to the height of 2m in 4s. What will be the power of the motor?

(a) 2.5 W      ✓

(b) 5 W

(c) 20 W

(d) 10 W

  1. Energy of the water stored in the dam is: (GRW 2015)

(a) Elastic potential energy

(b) Gravitational potential energy ✓

(c) Kinetic energy

(d) Mechanical energy

  1. How many types of mechanical energy are?

(a) 1

(b) 2   ✓

(c) 3

(d) 4

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