set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

A body floats in a liquid containing in a beaker. The whole system as shown in Fig. is falling under gravity. The upthrust on the body due to liquid is

a) equal to weight of body in air

b) zero

c) equal to weight of liquid displaced

d) equal to weight of immersed part of the body

Question : 2

Why it is easier to swim in the sea than in a river?

a) The sea water is deep

b) The sea water is heavier

c) The sea water is salty

d) The sea water is lighter

Question : 3

An ice cube is floating in a glass of water. What happens to the water level when the ice melts? It

a) Falls

b) Remains the same

c) Rises

d) First rises and then falls

Question : 4

A sudden fall in barometer reading indicates that the weather will be

a) Rainy weather

b) Cool dry weather

c) Stormy weather

d) Hot and humid weather

Question : 5

A container partly filled in a liquid is suspended from a spring balance. A small body is gently dropped in the container. The pointer of spring balance will

a) oscillate

b) read less

c) read the same

d) read more

Question : 6

Ideal liquid is that liquid

a) whose viscosity is zero

b) whose density is zero

c) which is compressible

d) None of these