Force and Motion

Q.

Which type of motion do the wheels of a moving car exhibit?

1. Oscillatory

2. Rotatory and translatory

3. Rectilinear

4. Circular

Q.

What is the difference between a running meter and meter?

Q.

A motion that repeats itself after equal intervals of time is known as:

1. Rectilinear motion.

2. Rotational motion.

3. Periodic motion.

4. Circular motion.

Q. A force cannot change:

1. the direction of a body.
2. the shape of a body.
3. the inertia of a body
4. the momentum of a body.

Q.

Assertion (A): In the process of nuclear fission, the amount of nuclear energy generated by the fission of an atom of uranium is so tremendous that it produces 10 million times the energy produced by the combustion of an atom of carbon from coal.

Reason (R): The nucleus of a heavy atom such as uranium, when bombarded with low-energy neutrons, splits apart into lighter nuclei. The mass difference between the original nucleus and the product nuclei gets converted to tremendous energy.

1. Both A and R are true and R is correct explanation of the Assertion

2. Both A and R are true but R is not the correct explanation of the Assertion

3. A is true but R is false

4. A is false but R is true.

Q.

Why can fusion and fission both produce energy?

Q.

The splitting of a heavy nucleus into two lighter nuclei is called ___________.

Q.

Match the contents of column (I) with contents of the column (II).

(i) Unit of mass	(a) Metre
(ii) Pendulum of clock	(b) Cicular motion
(iii) Point on the blade of a rotating fan	(c) kilogram
(iv) S.I. unit of length	(d) Periodic motion

1. (I)-b (II)-d (III)-c (IV)-a

2. (I)-a (II)-b (III)-c (IV)-d

3. (I)-c (II)-d (III)-b (IV)-a

4. (I)-c (II)-b (III)-d (IV)-a

Q.

A force produces an acceleration of $5m/s^2$. When it acts on the body of mass $30g.$ Find the force in newtons.

Q.

Write down the steps to measure the thickness of a one-rupee coin.

Q.

How much solar energy is received by India in one year?

Q.

A passenger in a moving car slips to one side of the seat when the car takes a sharp turn. Give a reason for it.

Q.

A boy standing on a bus is thrown towards the rear of the bus as it begins to move and to the front of it as it slows down. Why does this happen?

Q.

Define the term measurement.

Q.

Name the product of nuclear fission which is utilized to bring about further fission of ${}_{92}{}^{235}U$.

Q.

Inertia is dependent upon which of the following physical features of the object?

1. Velocity of the body

2. Acceleration applied

3. Mass of the body

4. Volume of the body

Q.

Give an example for each of the following

Oscillatory motion

Q. Solar energy can be directly utilised in __________.

1. drying food grains
2. rotating turbines
3. producing electricity
4. cooking food

Q.

Identify three kinds of motion exhibited by the Earth.

Q. Newton’s third law is applicable for __________.

1. both A and B
2. bodies in motion
3. bodies at rest
4. bodies with equal masses only

Q. Suppose two bodies of mass 2kg and 10kg are placed on a frictionless surface. The force required to move either of them is the same . Does that mean both bodies have same inertia ? Give reasons for your choice .

Q.

Explain nuclear fission reaction with an example.

Q.

A and B are two objects of masses 6 kg and 3 kg respectively, then inertia is more for object A.

1. 3 kg mass

2. 6 kg mass

Q. The wheel rotates half a cycle in the expansion stroke and rotates the other half because of ___

Q.

Wheels of a car have ____________ (rotatory/multiple) motions.

Q.

What forms tides in sea?

1. Gravitational pull of moon

2. Flow of wind over sea

3. Uneven heating of sea

4. None of the above

Q.

What is the standard unit of force?

Q. Which of the following has SI unit as $kgm{s}^{-2}$?

1. Force
2. Inertia
3. Momentum
4. Acceleration

Q.

A force produces an acceleration of $5.0cm{s}^{-2}$ when it acts on a body of mass $20g$. The force in Newton is:

1 dyne = $1gcm{s}^{-2}$

1. $2\times {10}^{-3}$

2. $4\times {10}^{-3}$

3. $1.0\times {10}^{-3}$

4. $5\times {10}^{-3}$

Q. For a rigid body, force cannot change its:

1. Speed
2. Shape
3. Direction
4. Position