Gravitation

1. Which of the following tools can be used to measure weight?

Measuring cylinder

C

Ruler

Watch

A spring balance is specifically designed to measure weight by utilizing the principle of Hooke's Law. It can accurately determine the force exerted by an object due to gravity, making it a suitable tool for weight measurement.

Explanation

A spring balance is specifically designed to measure weight by utilizing the principle of Hooke's Law. It can accurately determine the force exerted by an object due to gravity, making it a suitable tool for weight measurement.

2. The type of potential energy possessed by the ball, which allows it to fall, is

B. chemical

D

A. elastic

C. electrical

When a ball is dropped from a certain height, the potential energy it possesses is gravitational potential energy, which is converted into kinetic energy as it falls.

Explanation

When a ball is dropped from a certain height, the potential energy it possesses is gravitational potential energy, which is converted into kinetic energy as it falls.

3. The transfer of energy that takes place as the ball is dropped on the wooden platform is from the

Gravitational potential energy of the spring to the elastic potential energy of the ball

Gravitational potential energy of the ball to the gravitational potential energy of the spring

Elastic potential energy of the spring to the elastic potential energy of the ball

A

When the heavy ball is dropped, it loses gravitational potential energy as it falls and gains kinetic energy. Upon hitting the wooden platform, part of the kinetic energy is converted into elastic potential energy stored in the spring as it compresses.

Explanation

When the heavy ball is dropped, it loses gravitational potential energy as it falls and gains kinetic energy. Upon hitting the wooden platform, part of the kinetic energy is converted into elastic potential energy stored in the spring as it compresses.

4. Which statement about the mass and weight of the books is correct?

B

Mass of the books will vary with location.

Mass of the books is greater than their weight.

Weight of the books will not vary with location.

The weight of an object is the force of gravity acting on it, while mass is the amount of matter it contains. Weight is dependent on gravity and can vary based on location, but mass remains constant. In this scenario, since weight is measured first using a spring balance and then mass using a beam balance, the weight of the books will be greater than their mass.

Explanation

The weight of an object is the force of gravity acting on it, while mass is the amount of matter it contains. Weight is dependent on gravity and can vary based on location, but mass remains constant. In this scenario, since weight is measured first using a spring balance and then mass using a beam balance, the weight of the books will be greater than their mass.

5. When a ball is released from a height, it will fall because of gravitational force. The ball will fall with

Decreasing speed

C

Constant speed

Increasing acceleration

When a ball is released from a height, it will experience a constant acceleration due to gravity. This means that the velocity of the ball will increase at a constant rate as it falls.

Explanation

When a ball is released from a height, it will experience a constant acceleration due to gravity. This means that the velocity of the ball will increase at a constant rate as it falls.

6. A magnet released from a height falls on the ground because of the

Frictional force

Electrostatic force

D

Magnetic force

When an object is released from a height, it falls towards the ground due to the force of gravity, which is the attraction between two masses. It is not due to magnetic force, frictional force, or electrostatic force.

Explanation

When an object is released from a height, it falls towards the ground due to the force of gravity, which is the attraction between two masses. It is not due to magnetic force, frictional force, or electrostatic force.

7. Which row shows the mass and weight of the given satellite when it is in outer space?

B

C

D

A

In outer space, the satellite will still have a mass of 15 kg since mass is an intrinsic property of an object and does not change based on location. However, the weight of the satellite in outer space will be 0 N as weight depends on the gravitational force acting on an object, and there is negligible gravity in outer space.

Explanation

In outer space, the satellite will still have a mass of 15 kg since mass is an intrinsic property of an object and does not change based on location. However, the weight of the satellite in outer space will be 0 N as weight depends on the gravitational force acting on an object, and there is negligible gravity in outer space.

8. Mass and weight of an object are correctly defined in table

A

C.

B.

D.

In option A, mass is defined as the amount of material present in a body, while weight is defined as the gravitational force acting on a body. This is the correct definition of mass and weight.

Explanation

In option A, mass is defined as the amount of material present in a body, while weight is defined as the gravitational force acting on a body. This is the correct definition of mass and weight.

9. A substance weighs 100 kg. If acceleration due to gravity is 9.8 ms−2, then mass of the given substance will be

90 kg

40 kg

A

60 kg

The weight of the substance is given as 100 kg. Weight = mass * gravity. Therefore, mass = weight / gravity. Substituting the values, the correct mass of the substance is 100 kg / 9.8 ms^-2 = 10 kg.

Explanation

The weight of the substance is given as 100 kg. Weight = mass * gravity. Therefore, mass = weight / gravity. Substituting the values, the correct mass of the substance is 100 kg / 9.8 ms^-2 = 10 kg.

10. Two objects having masses m1 and m2 are separated by a distance r. The gravitational force between the two objects is inversely proportional to

D

A

C

B

The gravitational force between two objects is inversely proportional to the square of the distance between the objects, as described by Newton's law of universal gravitation.

Explanation

The gravitational force between two objects is inversely proportional to the square of the distance between the objects, as described by Newton's law of universal gravitation.