Test: Gravitation- Assertion & Reason Type Questions- 1 - Class 9 MCQ

Direction : In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : If the distance between two bodies of mass m1 and m2 is increased by a factor of 5, the gravitational force is reduced by 1/25.

Reason: The gravitational force is inversely proportional to the square of the distance between two bodies.

Direction : In each of the following questions, a statement of Assertion is given and a corresponding statement of Reason is given just below it. Of the statements, given below, mark the correct answer as:

Assertion : At the centre of earth, a body has a centre of mass but no centre of gravity.

Reason : Acceleration due to gravity at the centre of the earth is zero.

Direction : In each of the following questions, a statement of Assertion is given and a corresponding statement of Reason is given just below it. Of the statements, given below, mark the correct answer as:

Assertion : A man is sitting in a boat which floats on a pond. If the man drinks some water from the pond, the level of water in the pond will decrease.

Reason : The weight of the liquid displaced by the body is greater than the weight of the body.

Direction : In each of the following questions, a statement of Assertion is given and a corresponding statement of Reason is given just below it. Of the statements, given below, mark the correct answer as:

Assertion : A block of ice with a lead shot embedded in it floats on water contained in a vessels. The temperature of the system is kept at 0cC as the ice melts. When ice has melted completely, water level in the vessel rises.

Reason : The melted ice will raise the water level.

Direction : In each of the following questions, a statement of Assertion is given and a corresponding statement of Reason is given just below it. Of the statements, given below, mark the correct answer as:

Assertion : During a journey from the earth to the moon and back, maximum fuel is spent to overcome the earth’s gravity at take off.

Reason : Earth’s mass is much greater than that of the moon.

Direction : In each of the following questions, a statement of Assertion is given and a corresponding statement of Reason is given just below it. Of the statements, given below, mark the correct answer as:

Assertion : Kepler’s second law of planetary motion is also known as Kepler’s law of areas.

Reason : The line joining the planet and the sun sweeps equal areas in equal intervals of time.

Direction : In each of the following questions, a statement of Assertion is given and a corresponding statement of Reason is given just below it. Of the statements, given below, mark the correct answer as:

Assertion : It is the gravitational force exerted by the sun and the moon on the sea water that causes to the formation of tides in the sea.

Reason : Gravitational force of attraction is a strong force.