10 Question-Answer on law of gravitation
1. If the universal gravitation constant was time dependent, then which of the following quantities would be conserved:
(a) Potential energy
(b) Kinetic energy
(c) Linear momentum
(d) Angular momentum
Ans: ( d)
2. If the distance between the sun and the earth is increased by three times then attraction between two will:
(a) Remains constant
(b) Decrease by 63%
(c) Decrease by 83%
(d) Decrease by 89%
Ans: (d)
3. The acceleration due to gravity on the planate is 1.96 ms2. If it is safe to jump from a height of 3 m on the earth, the corresponding height on the planate will be:
(a) 3 m
(b) 6 m
(c) 9 m
(d) 15 m
Ans : ( d)
4. The tidal wave in the sea are primarily due to gravitational effect of:
(a) Earth on the sea
(b) Sun on the earth
(c) Earth on the moon
(d) Moon on the earth
Ans: (d)
5. The ratio between masses of two planets is 2 : 3 and the ratio between their radii is 3 : 2. The ratio between acceleration due to gravity on these two planets is:
(a) 4:9
(b) 8:27
(c) 9:4
(d) 27:8
Ans: (b)
6. If ge and gp denote the acceleration due to gravity on the surface on the earth and another planet whose mass and radius are twice that of earth, then the ratio gp/ ge is:
(a) ½
(b) √2
(c) 1
(d) 2
Ans: ( a)
7. Two planets have the same density but different radii. The acceleration due to gravity would be:
(a) Same on both the planets
(b) Greater on the smaller planet
(c) Greater on the larger planet
(d) Depends of the distance of planet from the sun
Ans: (c)
8. If the radius of the earth were to shrink by two percent, its mass remaining the same, the acceleration due to gravity on the earth’s surface would:
(a) Decrease by 2%
(b) Increase by 2%
(c) Increase by 4%
(d) Decrease by 4%
Ans: ( c)
9. If earth suddenly shrinks by one third of its present radius, the acceleration due to gravity will be:
(a) 2g/3
(b) 3g/2
(c) 4g/9
(d) 9g/4
Ans: (d)
10- Two point masses at a given distance exert a gravitational interaction force on earth other equal to F. If one mass is doubled, the other is halved, and the distance between them is doubled, the resulting interaction force is:
(a) F/4
(b) F/2
(c) 2F
(d) 4F
Ans: (a)