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
For total internal reflection :

(A) i > c	(B) i = c
(C) i < c	(D) i ≤ c

Question-2
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-3
The vocal cords in men are about how many long?

(A) 20 mm	(B) 2 cm
(C) 15 mm	(D) 15 cm

Question-4
The loudness of the sound depends upon :

(A) Amplitude	(B) Frequency
(C) Time period	(D) Velocity

Question-5
The angle in between the reflected ray and the normal drawn from the point of incidence is called :

(A) Angle of reflection	(B) Angle of incidence
(C) Angle of refraction	(D) Angle of contact

Question-6
Pinna is a part of :

(A) Inner ear	(B) Ear tube
(C) Middle ear	(D) Outer ear

Question-7
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-8
A fruit appears to be bigger in a glass of water due to :

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

Question-9
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-10
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

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Std 8

Tamil Nadu (English Medium)

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