Gravitation - Olympiad Level MCQ, Class 9 Science - Class 9 MCQ

There are two bodies of masses 100 kg and 10000 kg separated by a distance 1m. At what distance from

the smaller body, intensity of gravitational field will be zero?

At what height, is the value of g half that on the surface of earth? (R = radius of the earth)

A planet of mass m moves around the sun of mass M in an elliptical orbit. The maximum and minimum distances

of the planet from the sun are r1 and r2 respectively. The time period ofthe planet is proportional to

On a planet (whose size is the same and mass 4 times as that of the earth), the energy needed to lift a

2 kg mass vertically upwards through 2 m distance on the planet is (g = 10 m/s² on the surface of the earth)

A satellite is revolving in a circular orbit at a distance of 2620 km from the surface of the earth. The time

period of revolution of the satellite is (Radius of the earth = 6380 km, mass of the earth = 6 × 10²⁴ kg,

G = 6.67 × 10^-11 N-m²/kg²)

On the surface of the earth, force of gravitational attraction between two masses kept at distance d apart

is 6 Newtons. If these two masses are taken to the surface of the moon and kept at the same distance d,

the force between them will be

Time period of simple pendulum in a satellite is

A ball is dropped from a spacecraft revolving around the earth at height of 120 km. What will happen to

the ball ?

The value of the acceleration due to gravity at a height of 12,800 km from the surface of the earth

The weight of a body of mass 5 kg is :-

The weight of the body at the surface of the earth is 20 N and the radius of the earth is 6400 km. The

weight of a body at a height 6400 km above is :-

Consider a heavenly body which has a mass twice that of the earth and a radius thrice that of the earth. The

weight of a book on this heavenly body, if its weight on the earth is 900 N will be :-

Two protons are kept at a separation of 1 femtometre (1 femtometre = 10^-15 m). The mass of a proton is

1.67 × 10^-27 kg. The gravitational force between them is :-

The mass of the sun is 2.0 × 10³⁶ kg and that of the earth is 6.0 × 10²⁴ kg. The distance between the

sun and the earth is 1.5 × 10¹¹ m. The gravitational force between the sun and earth is :-

A particle is taken to a height of 2R_e above the earth's surface, where R_e is the radius of the earth. If it is

dropped from this height, its acceleration is will be :-

Consider a heavenly body whose mass is 3 × 10²⁴ kg (half of that of the earth) and radius is 3200 km (half

of that of the earth). The acceleratin due to gravity at the surface of this heavenly body will be :-

Two bodies 'A' and 'B' having masses 'm' and '2m' respectively are kept at a distance 'd' apart. A small particle

is to be placed so that the net gravitational force on it, due to the bodies A and B, is zero. Its distance from

the mass A should be :-

Two bodies of masses 1 kg and 2 kg respectively are placed at a separation of 1 m. Find the accelerations

of the bodies assuming that only gravitational force acts between them :-

Communication satellites move in the orbits of radius 44,400 km around the earth. The acceleration of such

a satellite assuming that the only force acting on it is that due to the earth is :-

Two persons weighing 50 kg and 60 kg are seated across a table. If they are one metre apart, the

gravitational force between them is :-

The mass of a planet is twice and its radius is 3 times that of the earth. The weight of a body, which has

a mass of 5 kg on the surface of the earth, on that planet is :-

The height at which a body has one fourth of its weight when it is on the surface of the earth is :-