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1st Year Physics Chapter 4 MCQs

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To get 1st Year Physics Chapter 4 MCQs with Answers Work and Energy, you have landed in the right place. In Physics, Work is done when a body is displaced from one place to another by a force. So, there is the concept of Work done by a constant force, by a variable force, and by gravitational force. Power is the rate at which work is done. Next, we have energy where we have Kinetic and Potential Energies. The next concept is the Interconversion of Potential and Kinetic Energies. Energy can’t be destroyed but it can be transformed from one form to another. This is the Law of Conservation of Energy. Some energy sources will be used in the future like energy from tides, energy from waves, Solar Energy, Energy from biomass, waste products, and geothermal energy. These are very useful to produce energy at very cheap rates. So, this is a brief introduction to this chapter. Now check out the quiz for this chapter below.

1st Year Physics Chapter 4 MCQs with Answers Work and Energy

1262

Physics Chapter 4

1 / 20

The average power and instantaneous power become equal if work is done at:

2 / 20

A 4 kg body is thrown vertically upward from the ground with a velocity of 5 ms–1. Its kinetic energy just before hitting the ground is

3 / 20

The kinetic energy of a body of mass 2 kg and momentum 2 Ns is

4 / 20

The work done is said to be negative if:

5 / 20

One watt-hour equals:

6 / 20

The engine of a car exerts a force of 2000 N and moves it with a constant velocity of 10 ms-1. The power developed by the engine is

7 / 20

Two bodies have the same kinetic energy. They are stopped by applying the same retarding force. Which body will stop earlier?

8 / 20

A body of mass 1000 kg traveling at 36 kmh-1  is brought to rest in 50 s. The average retarding force on the body will be

9 / 20

A man pushes a lawn mower with 75 N force directed at an angle of 30o from the vertical. The work done by the man as he cuts a strip of grass 20 m long is: 

10 / 20

The work done on a body is 49 J in raising it through 2.5 m, the mass of the body is:

11 / 20

A constant force F acting through a distance of 10 m changes the kinetic of a body from 30 J to 45 J. The magnitude of the force is

12 / 20

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

13 / 20

How much water a pump of 2 kW can raise in one minute to a height of 10 m (Take g = 10 ms–2)?

14 / 20

If the mass and speed of a body are halved then its K.E would:

15 / 20

One horsepower is equal to:

16 / 20

The commercial unit of electrical energy is:

17 / 20

The gravity does no work when the body moves

18 / 20

When the velocity of a body is doubled:

19 / 20

A child on a swing 1m above the ground at the lowest point and 6m above the ground at the highest point. The horizontal speed of the child at the lowest point of the swing is approximate.

20 / 20

If both mass and velocity are doubled then K.E would be:

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