MCQ Questions | Class 9 Science Chapter 12

MCQ Questions | Class 9 Science Chapter 12 | Sound with Answers 

MCQ Questions for Class9 Science Chapter 12 Sound

MCQ | Sound Class 9 | Part-2

Check the below NCERT MCQ Questions for Class 9 Science Chapter 12 Sound with Answers Pdf free download. MCQ Questions for Class 9 Science with Answers were prepared based on the latest exam pattern. We have Provided Sound Class 9 Science MCQs Questions with Answers to help students understand the concept very well.

Objective Question | NCERT Science Class 9

NCERT Solutions Class 9 Science
Book: National Council of Educational Research and Training (NCERT)
Board: Central Board of Secondary Education (CBSE)
Class: 9th
Subject: Science
Chapter: 12 ( Part-2 )
Chapters Name: Sound
Medium: English

Ncert Solutions for Class 9 Science | Objective Type Questions


You can refer to NCERT Solutions for Class 9 Science Chapter 12 Sound to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.
Sound | Class 9 Science | NCERT Solutions
Q1. Amplitude
A. wavelength
B. wave number
C. none of these
D. Amplitude
Ans: Which of the following is a mechanical wave?
Q2. Sound
A. Light
B. Radio waves
C. X-rays
D. Sound
Ans: Wave motion transfers
Q3. momentum
A. velocity
B. energy
C. mass
D. energy
Ans: The longitudinal waves can propagate only in :
Q4. Solids
A. Liquids
B. Gases
C. All the above
D. All the above
Ans: The sound waves which travel in the air are called:
Q5. Transverse waves
A. Longitudinal waves
B. Polarised waves
C. None of the above
D. Longitudinal waves
Ans: Infrasonic waves have frequencie
Q6. below 20 Hz
A. between 20 Hz and 20,000 Hz 
B. above 20,000 Hz
C. no upper or lower limit of frequencies
D. below 20 Hz
Ans: In the compression region of the medium in case of longitudinal wave:
Q7. The volume monetarily decreases
A. The density momentarily
B. The pressure monetarily increases
C. All the above
D. All the above
Ans: Which wave property determines loudness?
Q8. pitch
A. frequency
B. amplitude
C. All of these
D. amplitude
Ans: Force with which an object is made tovibrate
Q9. The speed of sound is greater in
A.Nickel
B.Ethanol
C.Air
D.Sulphur dioxide
Ans: Nickel
Q10. Horns of the vehicles are based on the principle of
A.Echo
B.Multiple reflections of sound
C.Ultrasound waves
D.None of these
Ans: Multiple reflections of sound
Q11. Children under age of 5 years can hear sound upto
A.10 kHz
B.20 2Hz
C.25 kHz
D.30 kHz
Ans: 25 kHZ
Q12. Rhinoceroses communicate using
A.Ultrasound waves
B.Infrasound waves
C.Audible sound waves
D.All of the above
Ans: Infrasound waves
Q13. The frequency of ultrasound waves is
A.Less than audible sound waves
B.Greater than audible sound waves
C.Equal to or less than sound waves
D.None of these
Ans: Greater than audible sound waves
Q14. If the pendulum oscillate 78 times in one minute then the frequency of that pendulum will be—
A.2 Hz
B.1.5 Hz
C.1.3 Hz
D.1.2 Hz
Ans: 1.3 Hz
Q15. Which is not the condition for hearing sound?
A. There must be a vibrating body capable of transferring energy
B. There must be a material medium to pick up and propagate energy
C. The medium must have a large density
D. There must be receiver to receive the energy and interpret it
Ans: The medium must have a large density
Q16. In case of transverse wave :
A. The hump on the + y axis is called crest
B. The hump on the – y axis is called crest
C. The highest point on the hump on + y axis is called crest
D. The highest point on the hump on the – y axis is called crest
Ans: The highest point on the hump on + y axis is called crest
Q17. Sound cannot travel throug
A. air
B. water
C. iron
D. space
Ans: space
Q18. In the bell jar experiment, as air is removed
A. intensity falls
B. speed of sound falls
C. both (a) and (b)
D. elasticity falls
Ans: intensity falls
Q19. A bat hears the echo of its squeak after 0.1 second. How far is the obstacle from the bat? Speed of sound is 344 m/s.
A. 170m
B. 17.2m
C. 180m
D. 18m
Ans: 17.2m
Q20. The method of detecting the presence, position and direction of motion of distant objects by reflecting a beam of sound waves is known as _____.
A. RADAR
B. SONAR
C. MIR
D. CRO
Ans: SONAR

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