CBSE Std 9 Study Materials, Online Learning, Question Papers, Classnotes, Practice Test, MCQ | Smartindia Educational Program : www.smartindia.net.in


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Problem Solving Assessment(PSA)

Question-1
How does the speed of sound change as temperature increases?

(A) Increases	(B) Decreases
(C) Does not change	(D) Unpredictable

Question-2
The sound collected by Pinna passes through the:

(A) Cochlea	(B) Eustachian tube
(C) Middle ear	(D) Auditory canal

Question-3
Which of these is a medical instrument used for listening to sounds produced within the body?

(A) Stethescope	(B) Periscope
(C) Thermometer	(D) Thermistor

Question-4
A sound wave has frequency 2 kHz and the wavelength 35 cm. How long will it take to travel 1.5 km?

(A) 3 s	(B) 3.1 s
(C) 2.5 s	(D) 2.1 s

Question-5
A soundwave has a frequency of 2 kHz and wave length 35 cm. How long will it take to travel
1.5 km?

(A) 600 m/s	(B) 700 m/s
(C) 500 m/s	(D) 7000 m/s

Question-6
The loudness and softness of a sound is determined basically by:

(A) Frequency	(B) Wavelength
(C) Momentum	(D) Amplitude

Question-7
A boat at anchor is rocked by waves whose troughs are 150 m apart and whose velocity is 30 m/s.How often do the crests reach the boat ?

(A) 0.2 s	(B) 10 s
(C) 0.5 s	(D) 5 s

Question-8
Find the time period of a wave whose frequency is 400 Hz?

(A) 0.0012 s	(B) 0.0025 s
(C) 0.0015 s	(D) 0.0010 s

Question-9
A sound wave has a frequency of 1000 Hz and a wave length of 34 cm.How long will it take to travel 1 km ?

(A) 3.20 s	(B) 2.94 s
(C) 5.94 s	(D) 3.10 s

Question-10
The process of forming image of heats from the reflection of ultrasonic waves is known as,

(A) Echocardiography	(B) X-ray
(C) Ultra sound scanning	(D) None of these

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Std 9

CBSE

Practice in Related Chapters
Motion
Gravitation
Force and Laws of Motion
Work and Energy
Sound