Assertion : A body falling freely under the force of gravity has constant acceleration (9.81 m/sec 2 ). Reason : Earth attracts every body towards its centre by the same force.

If both Assertion & Reason are False

If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion

If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion

If Assertion is True but the Reason is False

EASY

NEET

IMPORTANT

Earn 100

Assertion : For circular orbits, the law of periods is T² $\propto$ r³, where M is the mass of sun and r is the radius of orbit.
Reason : The square of the period T of any planet about the sun is proportional to the cube of the semi-major axis a of the orbit.

100% studentsanswered this correctly

Important Questions on Gravitation

EASY

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 11 - Gravitation>Exercise (Assertion & Reason)>Q 7

Assertion: If rotation of earth about its own axis suddenly stops, then acceleration due to gravity will increase at all places on the earth.
Reason: At height

h

from the surface of earth, acceleration due to gravity is,

g_{h} = g (1 - \frac{2 h}{R_{e}})

MEDIUM

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 11 - Gravitation>Exercise (Assertion & Reason)>Q 8

Assertion :If the earth stops rotating about its axis, the value of the weight of the body at equator will decrease.
Reason : The centripetal force does not act on the body at the equator.

EASY

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 11 - Gravitation>Exercise (Assertion & Reason)>Q 9

Assertion: Gravitational potential is maximum at infinity.
Reason: Gravitational potential is the amount of work done to shift a unit mass from infinity to a given point in gravitational attraction force field.

EASY

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 11 - Gravitation>Exercise (Assertion & Reason)>Q 10

Assertion : A person feels weightlessness in an artificial satellite of the earth. However a person on the moon (natural satellite) feels his weight.
Reason : Artificial satellite is a freely falling body and on the moon surface, the weight is mainly due to moon’s gravitational attraction.

EASY

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 11 - Gravitation>Exercise (Assertion & Reason)>Q 13

Assertion : The gravitational field of moon is much less than that of earth.
Reason : Gravitational field of a given mass (

M

) depends upon

\frac{M}{r^{2}}

, which is smaller for moon.

MEDIUM

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 11 - Gravitation>Exercise (Assertion & Reason)>Q 14

Assertion : In keplar’s law conservation of angular momentum does not take place.
Reason : Gravitation force acting between earth and the sun is perpendicular to line joining them.

EASY

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 11 - Gravitation>Exercise (Assertion & Reason)>Q 15

Assertion: On decreasing the distance between two masses potential energy increases.
Reason : Potential energy

U = \frac{G M m}{r}

MEDIUM

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 11 - Gravitation>Exercise (Assertion & Reason)>Q 16

Assertion : A body falling freely under the force of gravity has constant acceleration (9.81 m/sec²).
Reason : Earth attracts every body towards its centre by the same force.

Assertion : For circular orbits, the law of periods is T2 ∝ r3, where M is the mass of sun and r is the radius of orbit. Reason : The square of the period T of any planet about the sun is proportional to the cube of the semi-major axis a of the orbit.

Important Questions on Gravitation

Learn and Prepare for any exam you want !

Assertion : For circular orbits, the law of periods is T² $\propto$ r³, where M is the mass of sun and r is the radius of orbit.
Reason : The square of the period T of any planet about the sun is proportional to the cube of the semi-major axis a of the orbit.