Question

15. The moment of inertia of a body is independent of the following factor

a) The angular speed

b) Mass of the body

c) Nature of the distribution of the mass

d) Location of the axis of rotation [ ]

16. Which of the following has the highest moment of inertia when each

of them has the same mass and same radius

a) A solid sphere about one of its diameter

b) A spherical shell about one of its diameter

c) A disc about its axis perpendicular to the plane of disc

d) A ring about its axis perpendicular to the plane of the disc [ ]

17. The gravitational force between two bodies is ‘F’. When the mass of

each body is doubled and the distance between them is halved, then

the force between them will be

a) F b) 4F c) 8F d) 16 F [ ]

18. The escape velocity of earth is 11.2 km/sec. If the earth is compressed

to half of its radius, then the escape velocity

a) Remains the same

b) Increases

c) Decreases

d) Depends on the mass of the body [ ]

19. Two samples A and B of a gas initially of the same temperature and

pressure are compressed from a volume V to a volume such that

A is compressed isothermally and B adiabatically. Then the final

pressure of

a) A is greater than that of B

b) A is equal to that of B

c) A is less than that of B

d) Relation between A and B can not be defined [ ]

20. Three liquids A, B, C of masses 200 g, 300 g, 400 g, are at 30 ºC, 40 ºC

and 50 ºC respectively. When A and B are mixed the resultant

temperature is 32 ºC. When B and C are mixed the resultant

temperature is 45 ºC. The resultant temperature when A and C are

mixed is :

a) 34 ºC b) 45 ºC c) 40 ºC d) 42 ºC​

Answer 1

15) b mass of the body

16)b a spherical shell

17)