NDA Government Jobs Exams

The mirror used for the head light at a car is -
(A) spherical concave (B) plane
(C) cylindrical (D) parabolic concave

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NDA Other Question
A hot object loses heat to its surroundings in the form of heat radiation. The rate of loss of heat depends on
the
(A) temperature of the object
(B) temperature of the surroundings
(C) temperature difference between the object and its surroundings
(D) average temperature of the object and its surroundings An iron ball and a wooden ball of the same radius are released from a height 'H' in vacuum. The time taken to
reach the ground will be -
(A) more for the iron ball (B) more for the wooden ball
(C) equal for both (D) in the ratio of their weights