set 4 MCQ Questions & Answers Detailed Explanation

Question : 1

When water is heated from 0ºC to 10ºC. It’s volume

a) Decreases

b) Does not change

c) Increases

d) First decreases and then increases

Question : 2

The body temperature of a healthy man is

a) 37° Fahrenheit

b) 98.4° Celsius

c) 37° Celsius

d) 98.4° Kelvin

Question : 3

Consider telecommunication through optical fibres. Which of the following statement is not true?

a) Optical fibres are subject to electromagnetic interference from outside

b) Optical fibres can be of graded refractive index

c) Optical fibres have extremely low transmission loss

d) Optical fibres may have homogeneous core with a suitable cladding

Question : 4

An astronaut sees the colour of the sky as

a) Black

b) White

c) Blue

d) Red

Question : 5

Assertion (A):
Steam is more harmful for human body than the boiling water in case of burn.
Reason (R) :
Boiling water contains more heat than steam.

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

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

c) A is true, but R is false

d) A is false, but R is true

Question : 6

Consider the following statements.

1. If a person looks at a coin which is in a bucket of water, the coin will appear to be closer than it really is.
2. If a person underwater looks at a coin above the water surface, the coin will appear to be at a higher level than it really is.

a) Only 2

b) Only 1

c) 1 and 2

d) Neither 1 nor 2