Physics Gk Questions and Answers 2020-2021 - 2

Question: 6

Which one of the following is marked on the common use fluorescent tube light is

(A) 2800K

(B) 2930K

(C) 6500K

(D) 9999K

Question: 7

An electric motor runs on which principle?

(A) Changing magnetic field induces an electromotive force in a conductor

(B) Electrical energy can be converted into chemical energy in the presence of magnetic fields

(C) The current flowing through a conductor causes generation of heat that drives the engine

(D) A conductor carrying current in the direction perpendicular to the external magnetic field feels a force

Question: 8

Who discovered the electric bulb?

(A) Alexander Graham Bell

(B) Thomas Edison

(C) William Cook

(D) Terry Edison

Question: 9

The pitch or frequency of the siren of a coming train appears to be increasing because of

(A) Big bang theory

(B) Doppler’s effect

(C) Archemedes Principle

(D) Charles law

Question: 10

Magnets attract magnetic substance such as iron, nickel, cobalt etc. They can also repel

(A) Ferromagnetic substances

(B) Paramagnetic substances

(C) Diamagnetic substances

(D) Non magnetic substances