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class-4-Science – Work, Force and Energy

class-4-Work, Force and Energy-1

1 / 20

Why we sprinkle talcum powder on a carom board?

2 / 20

What happens to the total energy of a moving object if all the applied forces are conserved?

3 / 20

As defined in physics, work is done:

4 / 20

When we throw a ball into the air, it falls back. The force responsible for this is:

5 / 20

Mark the action in which work is being done:

6 / 20

A ________ jet travels faster than sound.

7 / 20

In which of the following situations no work is done ?

8 / 20

If the resultant force acting on a body of constant mass is zero, the body's momentum is:

9 / 20

Look at the lever below.

Which object has the similar working principle as the above leves.

10 / 20

Electricity traveling through a wire is an example of

11 / 20

Two girls playing table tennis. First girl hit the ball over the net and at a Point say 'T', the other girl hit it back with a lot of force.
What would happen at point 'T'?

1) The force caused a change in the size of the ball.
2) The force caused a change in the direction of the ball.
3) The force caused the ball to stop moving

12 / 20

In which of these activities, the sense of hearing is least important?

13 / 20

The works by using fuel derived from living and dead biological organisms.

14 / 20

Choose the wrong statement among followings

15 / 20

Look at the following picture carefully. First identify the picture. The
machine is a combination of two simple machines. Which simple
machines combine to make it?

16 / 20

Rahul is applying force on a moving object in the same direction, the speed of the object:

17 / 20

Air pressure is measured with a(n)

18 / 20

The following is a diagram of a simple electromagnet.

How could this electromagnet be made stronger ?

19 / 20

These products of nature are limited. Resources such as coal and oil are which means that when they are gone, nature cannot make them again. It is very important to limit their use and find other resources to replace them.

20 / 20

While walking, some or all of the following types of energy and work are involved:

Your score is

The average score is 25%

0%

class-4-Work, Force and Energy -2

1 / 10

Which of the following is NOT an SI unit of measure ?

2 / 10

The mechanical energy of a freely falling object is the difference

3 / 10

To measure the weight of milk, which of the following units can be used ?

4 / 10

Which of the following gadget is used to measure temperature?

5 / 10

The part of a nuclear power plant that prevents thermal pollution of lakes or rivers is the :

6 / 10

What is Nuclear Energy ?

7 / 10

Blow at a plastic toy windmill and then hold it under a tap from which water is dripping. Which of the following, this activity is trying to show ?

8 / 10

Which of these contain(s) an electromagnet ?

9 / 10

A calorimeter is used for :

10 / 10

As you go up a mountain top, your weight :

Your score is

The average score is 35%

0%