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
The voice box of human being is called :

(A) Pharynx	(B) Vocal box
(C) Larynx	(D) Vocal chord

Question-2
The human ear can hear sound of range :

(A) 20Hz - 200kHz	(B) 20Hz - 20kHz
(C) 2Hz - 20kHz	(D) 20KHz - 200kHz

Question-3
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-4
Which will we get maximum number of images?

(A) Mirrors are placed parallel	(B) Mirrors are placed perpendicular
(C) Mirrors are placed at an angle 45^o	(D) Mirrors are placed at an angle 30^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
For total internal reflection :

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

Question-7
The sound of frequency above 20kHz is called :

(A) Inaudible sound	(B) Ultrasonic wave
(C) Infrared sound	(D) both 1 and 2

Question-8
The comfortable distance up to which the normal eye can read is :

(A) 25 cm	(B) 20 cm
(C) 5 cm	(D) 10 cm

Question-9
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-10
The to and fro motion of an object is called :

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

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Std 8

Tamil Nadu (English Medium)

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