MCQ & Online Test – Sound – NCERT Class 9 Science Chapter 12

Online Test | MCQ Sound | NCERT Class 9 Science Chapter 12 | CBSE Syllabus

Every student of class 9 of NCERT/CBSE syllabus may take part this online test of NCERT Class 9 Science Chapter 12 MCQ Sound and verify his score to check preparedness

 

#1. What is the range of frequencies associated with infrasound

a) <20 Hz

b) <30 Hz

c) <40 Hz

d) <10 Hz

#2. A key of a mechanical piano struck gently & then struck again but much harder this time. In second case

a) sound will be louder but pitch will not be different

b) sound will be louder & pitch will also be higher

c) sound will be louder but pitch will lower

d) both loudness & pitch will remain unaffected

#3. In the diagram, half wavelength is

a) AB

b) BD

c) DE

d) AE

#4. What is the audible range of human

a) 16 Hz to 16000 Hz

b) 18 Hz to 18000 Hz

c) 20 Hz to 20000 Hz

d) 22 Hz to 22000 Hz

#5. When we change feeble sound to loud sound, we increase its

a) wavelength

b) velocity

c) frequency

d) amplitude

#6. Note is a sound

a) of mixture of two frequencies only

b) of a single frequency

c) of mixture of several frequencies

d) always unpleasant to listen

#7. What is the range of frequency associated with ultrasound

a) > 16 KHz

b) > 18 KHz

c) > 20 KHz

d) > 22 KHz

#8. In SONAR, we use

a) radio waves

b) ultrasonic waves

c) audible sound waves

d) infrasonic waves

#9. The physical quantity that will remain unchanged after reflection of sound wave

a) velocity

b) wavelength

c) frequency

d) all of these

#10. Sound travels in air if

a) there is no moisture in the atmosphere

b) particles of medium travel from one place to another

c) disturbance moves

d) both disturbance & particles of medium travel from one place to another

#11. The distance between two consecutive compression or rarefaction in wave is

a) λ

b) λ/2

c) λ/4

d) 2λ

#12. Note is a sound

a) of mixture of several frequencies

b) of mixture of two frequencies

c) of a single frequency

d) always unpleasant to listen

#13. Infrasound can be heard by

a) bat

b) rhinoceros

c) dog

d) human beings

#14. Earthquake produces which kind of sound before the main shock wave begins

a) ultrasound

b) infrasound

c) audible sound

d) none of the above

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Results

Congratulations. You scored above 60%.

Better luck next time. You scored below 60%.

Thank you for your participation

To Be Continued