The areal velocity of a planet revolving around the sun, with an angular momentum of 10 kgm2s-1, and mass of 5000 kg, will be (Hint: use Kepler’s 2nd law)

• A) 0.001 m2 s-1
• B) 0.005 m2 s-1
• C) 0.01 m2 s-1
• D) 0.5 m2 s-1

If moment of inertia is increased by 4 time, the time period of torsional becomes,

• A) Half
• B) Double
• C) Quadruple
• D) Remains same

In the formula F= Gm1m2/r2, the quantity G:

• A) is a universal constant of nature
• B) is used only when Earth is one of the two masses
• C) is greatest at the surface of Earth
• D) depends on the local value of g

How does the gravitational potential change as you move farther away from a body on earth?

• A) It remains constant
• B) It increases linearly
• C) It decreases with increasing distance
• D) It becomes zero

If radius of earth is increased by Four time, the escape velocity becomes,

• A) Double
• B) Triple
• C) Quadruple
• D) Remains constant

If you double the height of an object above the Earth's surface, how does the gravitational potential energy change?

• A) It becomes zero
• B) It doubles
• C) It remains constant
• D) It halves

Schwarzschild radius of a black hole related to,

• A) Escape velocity
• B) Gravitational constant
• C) Mass of the black hole
• D) Orbital velocity

A satellite of mass 200 kg is in orbit around the Earth at an altitude of 500 km. The gravitational potential energy of the satellite will be,

• A) 1.2 MJ
• B) 2.4 MJ
• C) 4.8 MJ
• D) 3.6 MJ

The unit of areal velocity is,

• A) m2 s-2
• B) m s-1
• C) m2 s-1
• D) a. m2 s

A rocket ship is coasting toward a planet. Its captain wishes to know the value of g at the surface of the planet. This may be inferred by:

• A) measuring g the diameter of the planet
• B) observing the ship’s acceleration and correcting for the distance from the center of the planet:
• C) measuring the apparent weight of an object of known mass in the ship
• D) measuring the density of the planet

What is the escape velocity from Earth's surface?

• A) 11.2 m/s
• B) 618 m/s
• C) 11.2 km/s
• D) 11.2 km/h

If mass of earth is increased, what will be the effect on gravitational potential,

• A) Decreased
• B) Increased
• C) May be increase or decrease
• D) Remains same

Let F1 be the magnitude of the gravitational force exerted on the Sun by Earth and F2 be the magnitude of the force exerted on Earth by the Sun. Then:

• A) F1 is equal to F2
• B) F1 is much greater than F2
• C) F1 is slightly greater than F2
• D) F1 is slightly less than F2

If the gravitational potential energy of an object is 200 J and its mass is 20 kg, what is its height above the reference point? (Take g = 10 m/s2)

• A) 4 m
• B) 2 m
• C) 10 m
• D) 8 m

At center of the Earth, gravitational force is

• A) Double
• B) Random
• C) Zero
• D) Maximum

The orbital velocity of a satellite at an altitude of 500 km from the surface of earth is,

• A) 11.2 km/s
• B) 7660 m/s
• C) 6400 m/s
• D) 10 Km/s

Earth exerts a gravitational force on the Moon, keeping it in its orbit. The reaction to this force, in the sense of Newton’s third law, is:

• A) the centripetal force on the Moon
• B) the nearly circular orbit of the Moon
• C) the tides due to the Moon
• D) the gravitational force on Earth by the Moon

Which force is considered the weakest among all fundamental forces in nature?

• A) Gravity
• B) Friction force
• C) Electromagnetic force
• D) Weak nuclear force

Let M denote the mass of Earth and let R denote its radius. The ratio g/G at Earth’s surface is:

• A) R^2/M
• B) M/R^2
• C) M/R
• D) MR^2

According to Einstein's theory of general relativity, what is gravity attributed to?

• A) Exchange of virtual particles
• B) Curvature of spacetime
• C) Gravitational waves
• D) Gravitons