1. Rainbow is seen after rain because of hanging molecules of water which act as
(A) Lenses
(B) Mirrors
(C) Prisms
(D) Slabs
Ans : (B)
2. Which of the following is a good conductor of heat but a bad conduction of electricity ?
(A) Celluloid
(B) Rubber
(C) Asbestos
(D) Mica
Ans : (D)
3. Wich colour of light shows maximum deviatin when passed through a prism?
(A) Red
(B) Green
(C) Violet
(D) Yellow
Ans : (C)
4. The owl can see most clearly in total darkness because
(A) It has squint eyes
(B) It has large eyes with orbs directed forward, giving it binocular sight
(C) It has light bulbs in its eyes Provided by nature
(D) It produces Infrasonic sounds
Ans : (B)
5. In a refreigerator the cooling system should always be
(A) at the top
(B) at the bottom
(C) at the middle
(D) can be anywhere
Ans : (B)
6. Ocean Currents are an example of
(A) Convection
(B) Conduction
(C) Insulation
(D) Radiation
Ans : (A)
7. Radio activity is due to
(A) unstable nucleus
(B) stable nucleus
(C) stable electronic configuration
(D) stable electronic configu ra tion
Ans : (A)
8. The device which transfer the signal from low resistance region to high resistance region is
(A) diode
(B) transistor
(C) capacitor
(D) inductor
Ans : (B)
9. Forged document are detected by
(A) ultraviolet rays
(B) infra-red rays
(C) bata rays
(D) gamma rays
Ans : (B)
10. Which of the following optical Illusion?
(A) Rainbow
(B) Earthshine
(C) Halo
(D) Mirage
Ans : (D)
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