Gravitation

Gravitation Worksheet-4

11. An object is thrown vertically upwards with a velocity u, the greatest height h to which it will rise before falling back is given by :

A. u/g                 B. u²/2g             C. u²/g                D. u/2g

12. The mass of moon is about 0.012 times that of earth of and its diameter is about h 0.25 times that of earth. The value of G on the moon will be :

A. Less than that on the earth

B. More than that on the earth

C. Same as that on the earth

Gravitation Worksheet-5

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

A. 1/4 times      B. 1/2 times      C. 4 times          D. 2 times

22. In the relation F = G × M × m/d², 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 the greatest on the surface of the earth

D. Is of the same value irrespective of the place of observation

Gravitation Worksheet-6

31. An object weighs 10 N in air. When immersed fully in a liquid, it weighs only 8 N. The weight of liquid displaced by the object will be :

A. 2 N                 B. 8 N                 C. 10 N               D. 12 N

32. A rectangular wooden block has length, breadth and height of 50 cm, 25 cm and 10 cm, respectively. This wooden block is kept on ground in three different ways, turn by turn. Which of the following is the correct statement about the pressure exerted by this block on the ground?

A. The maximum pressure is exerted when the length and breadth form the base

B. The maximum pressure is exerted when length and height form the base