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SAI INTERNATIONAL SCHOOL
CLASS-IX PHYSICS HOME ASSIGNMENT-13

OBJECTIVE

1. The mass of moon is about 0.012 times that of the earth and its diameter is about

0.25 times that of earth. The value of G on the moon will be:

(a) Same as that on the earth

(b) About one-fifth of that on the earth

(c) About one-sixth of that on the earth

(d) About one-fourth of that on the earth

2. An apple falls from a tree because of the gravitational attraction between the earth
and the apple. If F1 is the magnitude of the force exerted by the earth on the apple and
F2 is the magnitude of the force exerted by the apple on the earth, then

(a) F1 is very much greater than F2

(b) F2 is very much greater than F1

(c) F1 and F2 are equal

(d) F1 is only a little greater than F2

3. The earth and the moon are attracted to each other by gravitational force. The earth
attracts the moon with a force that is:

(a) More than that exerted by the moon

(b) Same as that exerted by the moon

(c) Less than that exerted by the moon

(d) Not related to that exerted by the moon

4. Two particles are placed at some distance. If the mass of each of the two particles is
doubled, keeping the distance between them unchanged, the value of gravitational force
between them will be:

(a) 1/4 times

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