Top 500+ TNPSC Group 4 Physics Questions and Answers - 3

Question: 11

In a periscope, ___ mirrors are used.

(A) plane

(B) spherical

(C) convex

(D) concave

Question: 12

In which one among the following is the speed of sound maximum?

(A) Air at 0 deg C

(B) Air at 100 deg C

(C) Wood

(D) Water

Question: 13

The material which do not conduct electric charges is

(A) silver

(B) mica

(C) copper

(D) graphite

Question: 14

The audible frequency range is _____

(A) above 70,000 Hz

(B) below 20 Hz

(C) above 20,000 Hz

(D) between 20 Hz and 20,000 Hz

Question: 15

Sound cannot travel through ____

(A) vacuum

(B) gases

(C) liquids

(D) solids