Light, Sound and Heat TNPSC Group 1 Questions

Light, Sound and Heat MCQ Questions

7.
The process in which heat is transmitted without the aid of the intervening medium is
A.
Conduction
B.
Convection
C.
Radiation
D.
None of these
ANSWER :
C. Radiation
8.

When a mirror is rotated by an angle of Ѳ, the reflected ray will rotate by

A.

0o

B.

Ѳ/2

C.

Ѳ

D.

ANSWER :

D. 2Ѳ

9.
Sound is not audible in moon. Why?
A.
there is no plantation in moon
B.
moon does not have atmosphere
C.
moon is similar than earth
D.
none of these
ANSWER :
B. moon does not have atmosphere
10.
Heat waves are otherwise known as
A.
Infra-red rays
B.
Ultra-violent waves
C.
Solar radiation
D.
X-rays
ANSWER :
C. Solar radiation
11.
Light from the Laser is
A.
Monochromatic
B.
Composite
C.
Dispersed light
D.
Incoherent
ANSWER :
A. Monochromatic
12.
suppose a rocket ship is receding from the earth at a speed of 1/10 of velocity of light. A light in the rocket ship appears blue to the passengers on the ship. What colour would it appear to an observer on the earth?
A.
blue
B.
orange
C.
yellow
D.
yellow orange
ANSWER :
C. yellow