The sun appears red at sunrise and sunset while it appears white at noon, because
(A) Of refraction
(B) It is cooler at sunrise and at sunset
(C) Of diffraction leading to red end of the spectrum reaching the earth.
(D) Of Scattering of light due to dust particles and air molecules.
A lake starts freezing because of the cold atmosphere It will first freeze
(A) At the bottom
(B) ln the middle pan
(C) At the top surface
(D) Uniformly throughout the water body
The beautiful color patterns exhibited by a peacock in its tail feathers are due to
(A) Selective absorption of light
(B) Selective re ection of light
(C) Sinterference of light
(D) Natural colour pattern of feathers
When a person enters a dark room from bright light he is not able to see clearly for a little while because the
(A) Eye is unable to adjust itself immediately
(B) Retina becomes insensitive momentarily
(C) Iris is unable to dilate the pupil immediately
(D) Distance between the lens and retina take time to adjust
Which part of the Camera is analogue to the retina in the human eye
(A) Lens
(B) Film
(C) Aperture
(D) Shutter
Dolly is the name of the
(A) First cloned sheep
(B) First cloned monkey
(C) First test-tube baby
(D) First human fossil
Dialysis is used for the treatment of__________
(A) Kidney failure
(B) Heart weakness
(C) Brain diseases
(D) None of these