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

• R^2/M

• M/R^2

• M/R

• R/M

Two bodies of masses 100 kg and 10000 kg are at a distance 1 m apart. At which point on the line joining them a third body experiences the gravitational force zero

• 11 m
• 1/11 m
• 10 m
• 1/10 m

Escape velocity of a particle from the earth surface is approximately

• 7 km/s
• 1.1 km/s
• 11.2 km/s
• 112 km/s

Among the statements which is/ are correct? Acceleration due to gravity (1) Decrease from equator to poles (2) Decreases from poles to equator (3) is maximum at the centre of earth

• (1) only
• (2) and (3) only
• (3) only
• (2)only

An artificial satellite is moving in a circular orbit around the earth with a speed equal to the escape velocity from the earth of radius R. Then what is the height of the satellite above the surface of the earth ?

• R/2
• R
• 3R
• none of these

For no change in the mass of the earth, if its radius is halved the weight of an object of mass 10 kg will be

• 40 kg wt
• 10 kg wt
• 80 kg wt
• 20 kg wt

The weight of a body of mass 15 kg on moon is

• 24.5 N
• 2.45 N
• 245 N
• 0.245 N

The first artificial satellite was

• Sputnik 1
• Explorer 1
• Aryabhatta
• Luna 3

The weight of the body is 19.6 N, the mass of the same body is (g = 9.8 m/s^2)

• 19.6 kg
• 9.8 kg
• 4 kg
• 2 kg

Two bodies of masses 2 kg and 16 kg are separated by a distance of 4 m. The gravitational force between these two bodies is (G= 6.67 x 10^-11 N/m^2)

• 6.67 X 10^ -11 N
• 13.34 X 10^ -11 N
• 20.01 X 10^ -11 N
• 26.68 X 10^ -11 N