The intensity of sound at a point is __________ its distance from the source.
(A) Directly proportional to
(B) Inversely proportional to
(C) Directly proportional to the square of
(D) Inversely proportional to the square of
Correct Answer
Answer: Option D
Out of the following pairs, which one does not have an identical dimension?
(A) Moment of inertia and moment of a force
(B) Work and Torque
(C) Angular momentum and Planck’s constant
(D) Impulse and Momentum
Correct Answer
Answer: Option A
On a stationary sail boat, air is blown from a fan attached to the boat. The boat
(A) Moves in opposite direction in which the air is blown
(B) Does not move
(C) Moves in the same direction in which air blows
(D) Spins around
Correct Answer
Answer: Option B
Isotopes of an element contain
(A) The same number of protons but different number of neutrons
(B) The same number of neutrons but different number of protons
(C) An equal number of protons and electrons
(D) An equal number of nucleons
Correct Answer
Answer: Option A
Identify the vector quantity from the following
(A) Heat
(B) Angular momentum
(C) Time
(D) Work
Correct Answer
Answer: Option B
An airplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically at a point ‘A’ on the ground a bomb is released from it. The bomb strikes the ground at point ‘B’. The distance ‘AB’ is
(A) 1200 m
(B) 0.33 km
(C) 3.33 km
(D) 33 km
Correct Answer
Answer: Option C
Photosynthesis takes place faster in
(A) Yellow light
(B) White light
(C) Red light
(D) Darkness
Correct Answer
Answer: Option B
It is more difficult to walk on a sandy road than on a concrete road because
(A) Sand is soft and concrete is hard in its nature
(B) The friction between sand and feet is less than that between concrete and feet
(C) The friction between sand and feet is more than that between concrete and feet
(D) The sand is grainy but concrete is smooth
Correct Answer
Answer: Option B
Radiocarbon is produced in the atmosphere as a result of
(A) A collision between fast neutrons and nitrogen nuclei present in the atmosphere
(B) The action of ultraviolet light from the sun on atmospheric oxygen
(C) The action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere
(D) Lightning discharge in the atmosphere
Correct Answer
Answer: Option A
Large transformers, when used for some time, become very hot and are cooled by circulating the oil. The heating of the transformer is due to
(A) The heating effect of current alone
(B) Hysteresis loss alone
(C) Both the heating effect of current and hysteresis loss