TRB Polytechnic Lecturer Exam Question Paper for Physics - 5

Question: 21

Core of transformer is made up of

(A) soft iron

(B) aluminium 

(C) steel

(D) copper

Question: 22

Which one of the following is printed on a commonly used fluorescent tube light?

(A) 220 k

(B) 273 k

(C) 6500 k

(D) 9000 k

Question: 23

The position of the object in a camera is

(A) At F

(B) At 2F

(C) Beyond 2F

(D) In between F and 2F

Question: 24

The sound produced by a bat is

(A) audible

(B) subsonic

(C) infrasonic

(D) ultrasonic

Question: 25

The mirror used by a dentist to examine the teeth of patients is

(A) Convex

(B) Concave

(C) Plane

(D) Cylindrical