NDA Government Jobs Exams

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

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NDA Other Question

Yellow colour light is used as fog because yellow colour
(A) light is most scattered by fog
(B) has the longest wavelength among all colours
(C) has the longest wavelength among all colours except red and orange but the red colour is already used for
brake light and stop light where as organe colour is avoided due to its similarly with red
(D) has the shortest wavelength among all colours not already reserved for other purpose The mirror used for the head light at a car is -
(A) spherical concave (B) plane
(C) cylindrical (D) parabolic concave