set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

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 : 2

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 : 3

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

Question : 4

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