Top 500+ TNPSC Group 4 Physics Questions and Answers - 2

Question: 6

The unit of frequency is

(A) hz

(B) m

(C) kg

(D) s

Question: 7

Unit of heat energy is

(A) degree

(B) joule

(C) metre

(D) kilogram

Question: 8

The geometric centre of the spherical surface of the mirror is called ___

(A) radius of curvature

(B) principal radius

(C) pole

(D) centre of curvature

Question: 9

Thermal expansion means expansion of bodies due to ___

(A) friction

(B) heat

(C) magnetism

(D) electric power

Question: 10

Pin hole camera is used ____

(A) as a microscope

(B) in automobiles

(C) in submarines

(D) in photographic camera