force of gravity, solids and fluids - Category wise Question and Answer Practice Test with Solutions

Question : 21 [NDA]

The weight of a body is 9.8 N at the place where g = 9.8 ms–2. Its mass is

a) 10 kg

b) 9.8 kg

c) zero

d) 1 kg

Question : 22

If a gas is heated at constant pressure its isothermal compressibility

a) decreases with temperature

b) remains constant

c) increases with temperature

d) decreases inversely with temperature

Question : 23 [IAS Prelim]

Assertion (A) :
The weight of a body decreases with the increase of altitude on earth.
Reason (R) :
The earth is not a perfect sphere.

a) A is true but R is false

b) Both A and R are true but R is not a correct explanation of A

c) Both A and R are true and R is the correct explanation of A

d) A is false but R is true

Question : 24 [NDA]

The specific gravity of a substance is measured by a hydrometer at the sea level. If the measurement is done at the top of a mountain, what would be the specific gravity ?

a) Less than that measured at the sea level

b) More than that measured at the sea level

c) Zero

d) Same as that measured at the sea level

Question : 25

The substance which exhibits practically no elastic effect is

a) Fe

b) quartz

c) rubber

d) Cu