10 QA on law of gravitation

10 QA on law of gravitation | Learn Physics

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

(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%

(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

(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

(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

(d) 27:8

Ans: (b)

6. If g_e and g_p 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 g_p/ g_e is:

(a) ½

(b) √2

(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

(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%

(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

(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

(d) 4F

Ans: (a)

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