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
Which of the following is correct on the basic of their density?

(A) air > water > glass	(B) glass > water > air
(C) glass > air > water	(D) water > glass > air

Question-2
The to and fro motion of an object is called :

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

Question-3
For total internal reflection :

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

Question-4
In periscope mirrors are maintains at which angle?

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

Question-5
The principle behind the working of optical fiber is :

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

Question-6
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-7
Pinna is a part of :

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

Question-8
The lens in human eye is :

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

Question-9
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-10
For critical angle the angle of refraction is :

(A) 0^o	(B) 45^o
(C) 90^o	(D) 180^o

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Std 8

Tamil Nadu (English Medium)

Practice in Related Chapters
Measurements
Force and Pressure
Electricity and Heat
Light and Sound