Top 500+ TRB Physics Question Paper with Answers - 3

Question: 11

Ultrasonic’s are sound waves of frequency

(A) Less than 10,000 Hz

(B) Greater than 20,000 Hz

(C) Equal to 1000 Hz

(D) None of these

Question: 12

Wavelength range of visible light is

(A) 200-900 nm

(B) 300-800 nm

(C) 390-780 nm

(D) 600-780 nm

Question: 13

In automatic wrist watches energy is provided by

(A) Battery

(B) Liquid crystal

(C) Manual binding

(D) Different movements of our hand

Question: 14

Who invented the ball point pen?

(A) Oscar

(B) Wilson

(C) Waterman

(D) Lazlo Biro

Question: 15

______ is used as a coolant in nuclear reactors?

(A) Cadmium

(B) Liquid sodium

(C) Heavy water

(D) Graphite