Class 9 Science MCQ Chapter 12 Sound

# Class 9 Science MCQ Chapter 12 Sound

Sound Class 9 MCQ: CBSE Sound Class 9 MCQs with answers are designed according to the latest CBSE syllabus recommended by CBSE for Class 9. Multiple Choice Questions (MCQs) from Chapter 12, Sound, are crucial for Class 9 Science exams. Understanding this topic is essential for students as it forms a significant part of their science curriculum. These Class 9 Science MCQs provide a structured way for students to test their knowledge and prepare effectively for their exams. For more study material refer to our NCERT Solutions Class 9 Science Chapter 12 Sound, CBSE Class 9 Sound Notes, NCERT Exemplar Solutions Class 9 Chapter 12 Sound for better understanding of this chapter.

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## MCQ for CBSE Class 9 Science Chapter 12 Sound

Class 9 Science students can utilize the provided set of multiple-choice questions with answers for Chapter 12, Sound. These MCQs are designed to help students prepare effectively for their exams, enabling them to achieve commendable scores.

### Chapter 12 Sound MCQ Questions Class 9 Science with Answers (Easy Level)

Here are ten multiple-choice questions on sound for Class 9 Science along with their answers:

Q1. Which of the following is a longitudinal wave?
a) Water wave
b) Light wave
c) Sound wave

Q2. The frequency of a sound wave determines its:
a) Loudness
b) Speed
c) Wavelength
d) Pitch

Q3. The speed of sound is maximum in:
a) Air
b) Water
c) Steel
d) Vacuum

Q4. Which part of the ear amplifies sound vibrations?
a) Cochlea
b) Eardrum
c) Ear canal
d) Ear ossicles

Q5. The phenomenon of persistence of sound after the source has stopped is called:
a) Reverberation
b) Echo
c) Resonance
d) Reflection

Q6.The minimum distance from a sound-reflecting surface required to hear an echo is:
a) 10 meters
b) 17 meters
c) 20 meters
d) 34 meters

Q7. The SI unit of sound intensity is:
a) Decibel
b) Hertz
c) Pascal
d) Watt per square meter
Answer: d) Watt per square meter

Q8. Sound cannot travel through:
a) Solids
b) Liquids
c) Gases
d) Vacuum

Q9. Which of the following animals does not use echolocation?
a) Bat
b) Dolphin
c) Whale
d) Ostrich

Q10. The phenomenon of bending of sound waves around obstacles is called:
a) Refraction
b) Diffraction
c) Interference
d) Polarization

### Class 9 Science MCQ Chapter 12 Sound (Moderate Level)

Q1. A sound wave with a frequency of 2000 Hz and a wavelength of 0.35 meters, what is the speed of the sound wave?
(a) 700 m/s
(b) 70 m/s
(c) 7 m/s
(d) 0.7 m/s

Q2. At 0°C, the speed of sound in air is –
(a) 330 m/s
(b) 331 m/s
(c) 334 m/s
(d) 344 m/s

Q3. At 22°C, the speed of sound in air is
(a) 330 m/s
(b) 331 m/s
(c) 334 m/s
(d) 344 m/s

Q4. At 25°C, the speed of sound in water is –
(a) 4700 m/s
(b) 3980 m/s
(c) 1531 m/s
(d) 1498 m/s

Q5. The sensation of sound persists in our brain for about-
(a) 0.1 second
(b) 0.2 second
(c) 0.3 second
(d) 0.4 second

Q6. The minimum distance for hearing distinct echoes from the source is –
(a) 17.0 m
(b) 17.2 m
(c) 17.3 m
(d) 17.4 m

Q7. The audible range of sound for human beings extends from about
(a) 10Hz to 2000Hz
(b) 20Hz to 20000Hz
(c) 10Hz to 2000Hz
(d) 20Hz to 2000Hz
Ans: (b) 20Hz to 20000Hz

Q8. Which of the following is correct?
(a) 1Hz=4cycle/s
(b) 1Hz=3cycles
(c) 1Hz=2cycle/s
(d) 1Hz=1cycle/s
Ans: (d) 1Hz=1cycle/s.

Q9. Which of the following animals can hear a sound of the frequency up to 25000Hz?
(a) above 18 years old man
(b) above 14 years old
(c) above the age of 7 years old children
(d) under the age of 5 years children
Ans: (d) under the age of 5 years children.

Q10. Rhinoceroses communicate using infrasound of frequency as low as –
(a) 7Hz
(b) 6Hz
(c) 5Hz
(d) 4Hz
Ans: (c) 5Hz.

### Sound Class 9 MCQ with Answers (High Level)

Q1. Which of the following can hear high-frequency squeaks of the bat?
(a) rat
(b) ant
(c) moth
(d) lizard
Ans: (c) moth

Q2. Infrasound can be produced by –
(a) whales
(b) dolphins
(c) bats
(d) porpoise
Ans: (a) whales.

Q3. Which of the following animals play games by producing ultrasound?
(a) dolphin
(b) elephant
(c) bats
(d) rats
Ans: (d) rats.

Q4. Which of the following properties of a medium does not affect the speed of sound waves passing through it?
(a) Density of the medium
(b) Temperature of the medium
(c) Pressure of the medium
(d) Humidity of the medium
Answer: (c) Pressure of the medium

Q5. What is the phenomenon responsible for the bending of sound waves around obstacles?
(a) Diffraction
(b) Refraction
(c) Reflection
(d) Interference

Q6. Which of the following statements is true regarding the frequency of sound waves?
(a) Frequency determines the loudness of sound.
(b) Frequency is inversely proportional to wavelength.
(c) Frequency is measured in decibels (dB).
(d) Frequency affects the pitch of sound.
Answer: (d) Frequency affects the pitch of sound.

Q7. How does the loudness of sound perceived by a person change with an increase in distance from the source?
(a) It increases
(b) It decreases
(c) It remains constant
(d) It fluctuates

Q8. Which of the following materials is the best conductor of sound waves?
(a) Air
(b) Water
(c) Steel
(d) Wood

Q9. The speed of sound in a gaseous medium depends primarily on:
(a) Pressure and humidity
(b) Temperature and pressure
(c) Density and humidity
(d) Temperature and humidity