[Class 11th - Physics - Gravitation - MERIT YARD]

[Class 11 - Gravitation]

Question 1 / 40Newton's Law of Gravitation states that force is directly proportional to:

A) Square of distance

B) Product of masses

C) Sum of masses

D) Difference of masses

Question 2 / 40The value of Universal Gravitational Constant (G) is:

A) 9.8 m/s²

B) 6.67 × 10¹¹ Nm²/kg²

C) 6.67 × 10⁻¹¹ Nm²/kg²

D) 6.67 × 10⁻¹⁹ Nm²/kg²

Question 3 / 40Gravitational force is:

A) Repulsive only

B) Always Attractive

C) Can be both

D) Depends on medium

Question 4 / 40Kepler's First Law is also known as:

A) Law of Periods

B) Law of Areas

C) Law of Orbits

D) Law of Gravity

Question 5 / 40Planets revolve around the Sun in which path?

A) Circular

B) Elliptical

C) Hyperbolic

D) Parabolic

Question 6 / 40Kepler's Second Law (Law of Areas) is a consequence of conservation of:

A) Linear Momentum

B) Energy

C) Angular Momentum

D) Mass

Question 7 / 40According to Kepler's Third Law:

A) T ∝ R

B) T² ∝ R³

C) T³ ∝ R²

D) T² ∝ R

Question 8 / 40Value of 'g' (acceleration due to gravity) on Earth's surface is approx:

A) 6.67 m/s²

B) 1.6 m/s²

C) 100 m/s²

D) 9.8 m/s²

Question 9 / 40If mass of both bodies is doubled, Gravitational Force becomes:

A) 2 times

B) 4 times

C) 8 times

D) Same

Question 10 / 40Relation between g and G is:

A) g = G M R²

B) g = G R / M

C) g = GM / R²

D) g = G / R²

Question 11 / 40Value of 'g' at the center of Earth is:

A) Maximum

B) 9.8 m/s²

C) Zero

D) Infinite

Question 12 / 40As we go to higher altitudes (height h), value of 'g':

A) Increases

B) Decreases

C) Remains same

D) Becomes zero immediately

Question 13 / 40As we go deep inside the Earth (depth d), value of 'g':

A) Increases

B) Decreases

C) Remains same

D) Becomes infinite

Question 14 / 40Value of 'g' is maximum at:

A) Equator

B) Poles

C) Center of Earth

D) Everywhere same

Question 15 / 40Gravitational Potential Energy at infinity is taken as:

A) Maximum

B) Minimum

C) Zero

D) Negative

Question 16 / 40Formula for Gravitational Potential Energy is:

A) GMm/r

B) -GMm/r

C) -GMm/r²

D) GM/r

Question 17 / 40Escape Velocity from Earth's surface is approx:

A) 9.8 km/s

B) 7.9 km/s

C) 11.2 km/s

D) 2.4 km/s

Question 18 / 40Formula for Escape Velocity is:

A) √gR

B) √2gR

C) 2gR

D) gR

Question 19 / 40Escape velocity depends on the mass of the body projected. True or False?

A) True

B) False (Independent of body's mass)

C) Depends on angle

D) Depends on shape

Question 20 / 40Orbital Velocity of a satellite very close to Earth is approx:

A) 11.2 km/s

B) 5 km/s

C) 8 km/s (7.9 km/s)

D) 3 km/s

Question 21 / 40Relation between Escape Velocity (Ve) and Orbital Velocity (Vo):

A) Ve = Vo

B) Ve = √2 Vo

C) Vo = √2 Ve

D) Ve = 2 Vo

Question 22 / 40Time period of a Geostationary Satellite is:

A) 12 Hours

B) 24 Hours

C) 365 Days

D) 48 Hours

Question 23 / 40Geostationary satellites appear ________ from Earth.

A) Moving Fast

B) Moving Slow

C) Stationary (Rest)

D) Oscillating

Question 24 / 40Weight of a body in a freely falling lift is:

A) mg

B) 2mg

C) Zero

D) Infinite

Question 25 / 40Gravitational Force is a ________ force.

A) Contact

B) Conservative

C) Non-conservative

D) Nuclear

Question 26 / 40Dimensional formula of Gravitational Constant 'G' is:

A) [MLT⁻²]

B) [M⁻¹ L³ T⁻²]

C) [M L² T⁻²]

D) [M⁻¹ L² T⁻²]

Question 27 / 40Work done by gravitational force in a closed loop is:

A) Positive

B) Negative

C) Zero

D) Infinite

Question 28 / 40If radius of Earth shrinks by 1% (mass constant), 'g' will:

A) Increase by 1%

B) Increase by 2%

C) Decrease by 2%

D) Decrease by 1%

Question 29 / 40Calculate force if two 1 kg masses are 1 m apart.

A) 1 N

B) 9.8 N

C) 6.67 × 10⁻¹¹ N (Equal to G)

D) Zero

Question 30 / 40Tides are caused by gravitational pull of:

A) Sun only

B) Moon only

C) Moon and Sun

D) Earth's core

Question 31 / 40Moon has no atmosphere because:

A) It is cold

B) Gas velocity > Escape velocity

C) It is far from sun

D) It has no water

Question 32 / 40Total energy of an orbiting satellite is:

A) Positive

B) Negative

C) Zero

D) Infinite

Question 33 / 40Weight of a person on Moon is ____ of weight on Earth.

A) 1/2

B) 6 times

C) 1/6

D) Equal

Question 34 / 40Height of a geostationary satellite from surface is approx:

A) 6400 km

B) 36,000 km

C) 1000 km

D) 24,000 km

Question 35 / 40Gravitational Potential (V) is given by:

A) -GM/r²

B) -GM/r

C) GM/r

D) GM/r²

Question 36 / 40The speed of a planet is maximum at:

A) Aphelion (Farthest point)

B) Perihelion (Nearest point)

C) Constant everywhere

D) Focus

Question 37 / 40If Earth stops rotating, 'g' at Equator will:

A) Decrease

B) Increase

C) Remain same

D) Become zero

Question 38 / 40Polar satellites are used for:

A) Communication

B) Remote Sensing / Weather

C) GPS only

D) TV broadcast

Question 39 / 40Which force keeps a satellite in orbit?

A) Electrostatic

B) Magnetic

C) Gravitational (providing Centripetal force)

D) Frictional

Question 40 / 40Two satellites in the same orbit must have same:

A) Mass

B) Velocity (Speed)

C) Kinetic Energy

D) Density

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