Unit 4: Work, Energy and Power — Mcqs

11th Class Physics · Unit 4: Work, Energy and Power

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Multiple Choice Questions

1.A1 kg mass has potential energy of 1 joule relative to the ground when it is at a height of:

2.An iron sphere whose mass is 30 kg has the same diameter as an aluminium sphere whose mass is 10.5 kg. The spheres are simultaneously dropped from a cliff. When they are 10m from the ground, they have identical:

3.A body at rest may have:

4.The height above the ground of a child on a swing varies from 0.5 m of his lowest point to 1.5 m at his highest point. The maximum speed of the child is approximately:

5.When a ball is thrown vertically upward and then falls back to the ground, which force can be considered conservative in this scenario?

6.According to work-energy principle in linear motion, the work done on body is equal to:

7.Power of a lamp is 6 W. How much energy does a lamp give out in 2 min?

8.A dry battery can deliver 3000 J of energy to a 2 W small electric motor before the battery is exhausted. For how many minutes does the battery run?

9.The kinetic energy acquired by a mass m after travelling a fixed distance from rest under the action of a constant force is directly proportional to:

10.A body moves a distance of 10 m along a straight line under the action of 5 N force. If the work done is 25 J, the angle which the force makes with the direction of motion of the body is:

SLO Based Additional MCQs + Past papers MCQs of Punjab Boards

Work

1.When the force is parallel to the direction of motion of the body the work done is?

2.Gravity performs zero work when body moves:

3.If a body of mass 2kg is raised vertically through 2m then the work done will be:

4.Work done will be maximum when angle between F and dis:

5.Work has the dimensions as that of:

Conservative Field

6.If P = Pressure, ΔV = change in volume, PAV represents:

7.A field in which the work done in moving a body along a closed path is zero known as:

Unit of power

8.1 Kilowatt is equal =:

a 1000J/S
b 10^6 watt
c 0.1 × 10^3 watt
d 6.25 × 10^{25} J

Unit of energy

9.If an agent consumes a power of 1kW in one hour the work done is:

Absolute P.E.

10.The work done in lifting a body of mass m from surface of the earth to an infinite distance is:

11.Absolute P.E of a body of mass "m" at a distance "r" from earth centre is:

Power

12.The consumption of energy by a 60 watt bulb in 2 seconds is:

13.A force of 10N is required to overcome road friction and air resistance in propelling an automobile at 30m/sec. power developed by the engine:

14.Power can be defined as the scalar product of:

15.The dimension of power is:

Escape velocity

16.The escape velocity on the earth surface is:

17.Escape velocity depends upon:

Non-conservative force

18.Which of the following is non-conservative force?

Work energy principle

19.Work done on a body for increasing velocity results in:

20.A body of mass 0.2kg initially moving with velocity 10m/s comes to rest in 1m. how much retarding force acts on it?

Potential energy

21.A man carries a bucket of water of 1 kg for 10m height then work done is:

Relation between momentum and K.E.

22.Two bodies A and B of mass 1kg and 2kg respectively have same momentum. Which one has greater KE?

Characteristic of work

23.Which one of the following is/are correct?

Kinetic energy

24.If the velocity of the body becomes doubled and mass becomes half then its K.E:

Dimension of power and K.E.

25.Ratio of dimension of power and K.E is:

K.E.

26.A body of mass 1.0 kg drops from the top of a tower of height 50m, what will be its K.E, 10m below the top?

Force displacement graph

27.The area under the force-displacement graph represents:

Unit of work

28.Kilowatt hour is unit is: