Class 9 Science Chapter 10 Gravitation Questions

 📝Class 9 Science Chapter 10 Gravitation Questions

Q. The gravitational force between two objects is `F`. If masses of both objects are halved without changing distance between them, then the gravitational force would become

(a) `F/4` 

(b) `F/2` 

(c) `F` 

(d) `2 F`

Q. In the relation `F = G frac{M m}{d^2}`, the quantity G

(a) depends on the value of g at the place of observation

(b) is used only when the earth is one of the two masses

(c) is greatest at the surface of the earth

(d) is universal constant of nature

Q. 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 

(b) `4` times 

(c)`1/2` times 

(d) unchanged

Q. What is the magnitude of the gravitational force between the earth and a 1 kg object on its surface? (Mass of the earth is `6 × 10^24` kg and radius of the earth is `6.4 × 10^6` m.)

Q. The mass of the earth is `6 × 10^24` kg and that of the moon is `7.4 × 10^22` kg. If the distance between the earth and the moon is `3.84×10^5` km, calculate the force exerted by the earth on the moon. (Take `G = 6.7 × 10^{–11} N m^2 kg^{-2}`)