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d.

5.
The length of second’s pendulum on earth where the acceleration due to gravity is
10ms is nearly 1 meter. The length of second’s pendulum on a planet where g = 5
-2
2
m/s is
a. 0.5 m .

b. 0.2 m.
c. 0.1 m.

d. 0.05 m.

6.
A man falls 50 m distance in 1 minute near the surface of earth. The distance covered
by him near the moon’s surface in same time will be

a. 50 6 m.

b. 50 m.

c. 50 / 6 m.

d. 50 50 m.

7.
If the mass of the planet is doubled and radius is halved, the acceleration due to gravity
becomes

a. eight times the original value.

b. equal to the original value.

c. four times the original value.

d. twice the original value.

8.
An object weighs 72 N on earth. Its weight at a height of R/2 from earth is

a. 32 N.
b. 56 N.

c. 72 N.
d. 0.

9.
Assuming earth to be a sphere of mass M and radius R, the acceleration due to gravity
g is proportional to

a. R .
-2
b. R .
-1
c. R .
0
d. R .
1