Physics Top MCQs – 5

Rainbow is produced when sunlight fall on drops of rain. Which of the following physical phenomena are responsible for this?
I. Diffusion
II. Refraction
III. Internal reflection
(A) I, II and III
(B) I and II
(C) II and III
(D) I and III
Answer: Option C

Rain is falling vertically downwards. To a man running east-wards, the rain will appear to be coming from
(A) East
(B) West
(C) Northeast
(D) Southeast
Answer: Option A

Planets are
(A) Luminous heavenly bodies revolving around a star
(B) Non-luminous heavenly bodies
(C) Luminous heavenly bodies that twinkle
(D) Luminous heavenly bodies that do not twinkle
Answer: Option B

Intensity of sound has
(A) An object existence
(B) A subject existence
(C) No existence
(D) Both subjective and objective existence
Answer: Option A

Metals are good conductors of electricity because
(A) They contain free electrons
(B) The atoms are lightly packed
(C) They have high melting point
(D) All of the above
Answer: Option A

Find the maximum velocity for the overturn of a car moving on a circular track of radius 100 m.
The co-efficient of friction between the road and tyre is 0.2
(A) 0.14 m/s
(B) 140 m/s
(C) 1.4 km/s
(D) 14 m/s
Answer: Option D

The ozone layer restricts
(A) Visible light
(B) Infrared radiation
(C) X-rays and gamma rays
(D) Ultraviolet radiation
Answer: Option D

When a moving bus stops suddenly, the passenger are pushed forward because of the
(A) Friction between the earth and the bus
(B) Friction between the passengers and the earth
(C) Inertia of the passengers
(D) Inertia of the bus
Answer: Option C

The velocity of sound in air (under normal condition) is
(A) 30 m/sec
(B) 320 m/sec
(C) 343 m/sec
(D) 3,320 m/sec
Answer: Option C