Tamil Nadu (English Medium) Std 8 Study Materials, Online Learning, Question Papers, Classnotes, Practice Test, MCQ | Smartindia Educational Program : www.smartindia.net.in

Question-1
If the angle of incidence is 40^o the angle of reflection is :

(A) 10^o	(B) 40^o
(C) 20^o	(D) 90^o

Question-2
Dogs have the ability to hear the sound of range :

(A) higher than 10kHz	(B) lower than 10kHz
(C) higher than 20kHz	(D) lower than 20kHz

Question-3
The light deviated away from the normal when it passes from :

(A) Rarer to denser medium	(B) Rarer to rarer medium
(C) Denser to denser medium	(D) Denser to rarer medium

Question-4
The lens in human eye is :

(A) Concave lens	(B) Convex lens
(C) Bi concave lens	(D) Bi convex lens

Question-5
Kaleidoscope works on which principle?

(A) Multiple refraction	(B) Multiple interference
(C) Multiple deflection	(D) Multiple reflection

Question-6
Stem and prongs are the parts of :

(A) Violin	(B) Tuning fork
(C) Sitar	(D) Sonometer

Question-7
For getting 5 images two plane mirrors are fix at which angle?

(A) 30^o	(B) 60^o
(C) 45^o	(D) 90^o

Question-8
A swimming pool appears more shallow than its actual depth because of :

(A) Refraction	(B) Reflection
(C) interference	(D) defraction

Question-9
In periscope mirrors are maintains at which angle?

(A) 90^o	(B) 0^o
(C) 45^o	(D) 60^o

Question-10
The principle behind the working of optical fiber is :

(A) Reflection	(B) Refraction
(C) Total internal reflection	(D) Multiple reflection

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Std 8

Tamil Nadu (English Medium)

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Light and Sound