set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied ?

a) Length = 100 cm, diameter = 1 mm

b) Length = 50 cm , diameter = 0.5 mm

c) Length = 200 cm, diameter = 2 mm

d) Length = 300 cm, diameter = 3 mm

Question : 2

The density of water will reach its maximum value at the temperature of

a) 4°C

b) 50°C

c) 0°C

d) 100°C

Question : 3

An iron needle floats on the surface of water due to

a) Surface tension

b) Viscosity

c) Upthrust of water

d) Gravitational force

Question : 4

Water is flowing through a horizontal pipe in streamline flow. At the narrowest part of the pipe

a) Pressure is maximum and velocity is minimum

b) Velocity is maximum and pressure is minimum

c) Both the pressure and velocity are maximum

d) Both the velocity and pressure are minimum

Question : 5

A boy carries a fish in one hand and a bucket of water in the other hand. If he places the fish in the bucket, the weight now carried by him.

a) is more than before

b) is less than before

c) is the same as before

d) depends upon his speed

Question : 6

In automobile hydraulic brakes work on

a) Newton’s law of motion

b) Bernoulli’s Principle

c) Archimedes Principle

d) Pascal’s Law