TRB Polytechnic Lecturer Exam Question Paper for Physics - 3

Question: 11

Electric iron uses wires of alloy as

(A) They do not burn at high temperatures

(B) They do not oxidize at high temperatures

(C) Both (a) and (b)

(D) Neither (a) nor (b)

Question: 12

What has its maximum density at

(A) O°C

(B) 4°C

(C) -4°C

(D) 100°C

Question: 13

The reason of mirage is

(A) Interference of light

(B) Diffraction of light

(C) Total internal reflection of light

(D) Polarization of light

Question: 14

When light enters from air to water, then its

(A) frequency increase and speed decrease

(B) frequency is decreases but the wavelength is smaller in water than in air

(C) frequency is same but the wavelength is greater in water than in air

(D) frequency is same but the wavelength is smaller in water than in air

Question: 15

The centripetal force required for a car or a bicycle to go round a circular curve depends on

(A) Speed and the radius of curvature of the curve

(B) The radius of curvature of the path only

(C) Speed of the vehicle only

(D) The angle of elevation of the curved track