Gravitation Test

Result

Gravitation Test - 80

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Weekly Quiz Competition

Question 1
4 / -1

The ratio of the radius of a planet \'A\' to that of planet \'B\' is `r\'. The ratio of acceleration due to gravity on the planets is \'x\'. The ratio of the escape velocities from the two planets is

A

B

C

D
Question 2
4 / -1

The mass of the moon is about 1.2% of the mass of the earth. Compared to the gravitational force the earth exerts on the moon, the gravitational force the moon exerts on earth

A
Is the same

B
Is smaller

C
Is greater

D
Varies with its phase
Question 3
4 / -1

A clock S is based on oscillation of a spring and a clock P is based on pendulum motion. Both clocks run at the same rate on earth. On a planet having the same density as earth but twice the radius

A
S will run faster than P

B
P will run faster than S

C
They will both run at the same rate as on the earth

D
None of the above
Question 4
4 / -1

The ratio of the radius of the earth to that of the moon is10. The ratio of acceleration due to gravity on the earth and on the moon is 6. The ratio of the escape velocityfrom the earth\'s surface to that from the moon is

A
10

B
6

C
Nearly 8

D
1.66
Question 5
4 / -1

The mass of the moon is 1/81of the earth but the gravitational pull is 1/6 of the earth. It is due to the fact that

A

B

C
Moon is the satellite of the earth

D
None of the above
Question 6
4 / -1

A body falls freely under gravity. Its speed is v when it has lost an amount U of the gravitational energy. Then its mass is

A

B

C

D
Question 7
4 / -1

If a planet consists of a satellite whose mass and radius were both half that of the earth, the acceleration due to gravity at its surface would be(g on earth = 9.8 m/sec²)

A
4.9 m/sec²

B
8.9 m/sec²

C
19.6 m/sec²

D
29.4 m/sec²
Question 8
4 / -1

At a given place where acceleration due to gravity is \'g\'m/sec², a sphere of lead of density\'d\' kg/m³ is gently released in a column of liquid of density ‘ρ\' kg/m³. If d > ρ, the sphere will

A
Fall vertically with an acceleration 'g' m/sec²

B
Fall vertically with no acceleration

C

D
Question 9
4 / -1

g_e and g_p denote the acceleration due to gravity on thesurface of the earth and another planet whose mass and radius are twice as that of earth. Then

A
g_p = g_e

B
g_p = g_e / 2

C
g_p = 2g_e

D
g_p = g_e / 4
Question 10
4 / -1

At some point the gravitational potential and also the gravitational field due to earth is zero. The point is

A
On earth's surface

B
Below earth's surface

C
At a height R_e from earth's surface (R_e = radius of the earth)

D
At infinity