Rainbow is produced when sunlight falls 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
Correct Answer
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
Correct Answer
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
Correct Answer
Answer: Option B
The intensity of sound has
(A) An object existence
(B) A subject existence
(C) No existence
(D) Both subjective and objective existence
Correct Answer
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
Correct Answer
Answer: Option A
Find the maximum velocity for the overturn of a car moving on a circular track of radius 100 m. The coefficient of friction between the road and tire is 0.2
(A) 0.14 m/s
(B) 140 m/s
(C) 1.4 km/s
(D) 14 m/s
Correct Answer
Answer: Option D
The ozone layer restricts
(A) Visible light
(B) Infrared radiation
(C) X-rays and gamma rays
(D) Ultraviolet radiation
Correct Answer
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) The inertia of the bus
Correct Answer
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
Correct Answer
Answer: Option C
The escape velocity of a rocket fired from the earth towards the moon is a velocity to get rid of the-
