Q. Supersonic plane fly with the speed
A.less than the speed of sound
B.of sound
C.greater than the speed of sound
D.of light
Q. Rainbow is due to
A.absorption of sunlight in minute water droplets
B.diffusion of sunlight through water droplets
C.ionisation of water deposits
D.refraction and reflection of sunlight by water droplets
Q. Liquid metal is
A. zinc
B. saline
C. lead
D. mercury
Q. Sound travels fast through
A. water
B. air
C. steel
D. vacuum
Q. The lens used to rectify long sight is
A. convex lens
B. concave lens
C. plano concave lens
D. plano convex lens
Q. When milk is churned cream gets separated due to
A. gravitational force
B. frictional force
C. centripetal force
D. centrifugal force
Q. We cannot see during a fog because of
A. refraction
B. internal reflection
C. scattering of light
D. reflection of light
Q. Who is the father of discoveries?
A. Edison
B. Pascal
C. Einstein
D. Archimedes
Q. X–rays travel with the velocity of
A. positive rays
B. sound
C. light
D. alpha rays
Q. Power of a lens is measured in
A. ultrasonic unit
B. decibel
C. dioptre
D. magnification
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