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

Question : 1 [NDA]

Consider two hollow glass spheres, one containing water and the other containing mercury. Each liquid fills about one-tenth of the volume of the sphere. In zero gravity environment

a) mercury forms a layer on the glass, while water floats

b) water forms a layer on the glass, while mercury floats

c) water and mercury float freely inside the sphere

d) water and mercury both form a layer on the glass

Question : 2

Assertion :
The value of ‘g’ is greater at the equator than at the poles.
Reason :
Radius is more at the equator than at the poles.

a) If Assertion is correct but Reason is incorrect.

b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.

c) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

d) If Assertion is incorrect but Reason is correct.

Question : 3

Assertion (A) :
Space rocket are usually launched in the equatorial line from west to east
Reason (R) :
The acceleration due to gravity is minimum at the equator.

a) A is true but R is false

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

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

d) A is false but R is true

Question : 4 [IAS Prelim]

The mass of a body on earth is 100 kg (acceleration due to gravity, $g_e = 10 m/{s}^2$. If acceleration due to gravity on the moon is $g_e$/ 6, then the mass of the body on the moon is :

a) 100 kg

b) 60 kg

c) 100/6 kg

d) 600 kg

Question : 5 [NDA ]

Two identical blocks of ice, A and B, float in water as shown in the figure given below. Which one among the following statements in this regard is correct?

a) Block B displaces a greater volume of water since its submerged end has a greater area in water

b) Block A displaces a greater volume of water since its submerged end is lower in the water.

c) Block A displaces a greater volume of water since the pressure acts on a smaller bottom area ce of Gravity, Solids & Fluids A-27

d) The two blocks displace equal volumes of water since they have the same specific gravity and same mass