Question

Class 8 Science MCQ Questions of Sound with Answers?

Answer 1

Practicing these Class 8 Science MCQ Questions of Sound with Answers will help you to answer every question that is being asked in the exams. Class 8 Science MCQ Questions of sound with Answers is available here. CBSE MCQ Questions for Class 8 Science Sound assist the students to understand the concepts thoroughly and to score good marks.

We prepared these MCQ Questions on the basis latest exam Pattern and syllabus. Students can solve NCERT Class 8 Science objective types Questions before the exam to know their preparation level. At Sarthaks eConnect, you can get MCQ Questions for Class 8 Science of all Chapters with detailed Answers. Have a look at the below listed 2o Multiple Choice Question of Sound Chapter.

Practice Class 8 Science MCQ Questions chapter-wise

1. The voice box is also called as

(a) stomach
(b) heart
(c) larynx
(d) mouth

2. Sound is a kind of

(a) work
(b) energy
(c) force
(d) pressure

3. The hearing range of the human ear is

(a) 20 Hz to 20,000 Hz
(b) less than 20 Hz
(c) more than 20,000 Hz
(d) 20 Hz to 25,000 Hz

4. Pitch of sound is determined by its

(a) frequency
(b) speed
(c) amplitude
(d) loudness

5. The frequency of subsonic sound is

(a) more than 20 Hz
(b) 100 Hz
(c) less than 20 Hz
(d) more than 20,000 Hz

6. Cochlea is a part of

(a) hearing organ
(b) sound-producing organ
(c) muscular organ
(d) air pollution

7. 1 hertz is equal to

(a) 1 vibration per minute
(b) 10 vibrations per minute
(c) 60 vibrations per minute
(d) 600 vibrations per minute

8. Sound cannot travel through

(a) air
(b) water
(c) air
(d) vacuum

9. The sound in the audible range is called

(a) ultrasonic sound
(b) sonic sound
(c) subonic sound
(d) light sound

10. A pendulum oscillates 20 times in 4 seconds. Find its time period.

(a) 0.05 sec
(b) 0.001 sec
(c) 0.2 sec
(d) 0.1 sec

11. Loudness of sound is determined by

(a) pitch
(b) frequency
(c) amplitude
(d) time period

12. The number of vibrations made by a vibrating body in one second is

(a) frequency
(b) noise
(c) loudness
(d) pitch

13. Sound is produced by

(a) Non-Vibrating objects only
(b) Vibrating and non-vibrating objects
(c) Vibration has no relation to sound
(d) Vibrating objects only

14. Vibration is also known as

(a) Vibratory motion
(b) Translatory motion
(c) Oscillatory motion
(d)  None of these

15. Frequency is expressed in

(a) Kilometer
(b) Hertz
(c) gram
(d) Degree centigrade

16. Loudness becomes painful above how many decibels?

(a) 60 dB
(b) 250 dB
(c) 80 dB
(d) 20,000 dB

17. When the amplitude of vibration is large, the sound produced is

(a)  No sound
(b) feeble
(c) loud
(d) No relation between amplitude and sound

18. Voice of a man is heavy compared to a woman because

(a) Female vocal cord is longer
(b) Male vocal cord is shorter
(c) Male vocal cord is longer
(d) The concept is not related

19. The loudness of a sound depends on:

(a) its amplitude
(b) its frequency
(c) its time period
(d) its speed

20. An object is vibrating at 50 hertz. What is its time period?

(a) 0.02 s
(b) 2 s
(c) 0.2 s
(d) 20.0 s

21. Sound can travel through:

(a) gases only
(b) solids only
(c) liquids only
(d) solids, liquids, and gases

22. A shehnai produces sound from:

(a) vibrating strings
(b) vibrating membrane
(c) vibrating air column
(d) none of these

23. When the amplitude is small, the sound produced is:

(a) loud
(b) Moderate
(c) Faint
(d) Shrill

24. Which of the following is not caused due to noise pollution?

(a) lack of sleep
(b) hypertension
(c) Diabetes
(d) Anxiety

25. High frequency of sound vibrations will produce a:

(a) loud sound
(b) shrill
(c) meak sound
(d) low piched sound

Answer 2

1. Answer: (c) larynx

Explanation: The larynx, or voice box, is located in the neck and performs several important functions in the body.

2. Answer: (b) energy

Explanation: Sound energy is defined as the movement of vibrations through matter. Sound energy is produced when an object vibrates, which results in noise. 

3. Answer: (a) 20 Hz to 20,000 Hz

Explanation: While 20 to 20,000Hz forms the absolute borders of the human hearing range, our hearing is most sensitive in the 2000 - 5000 Hz frequency range.

4. Answer: (a) frequency

Explanation: The number of vibrations per second or frequency determines the pitch of a sound. Frequency is directly proportional to pitch. Higher the frequency, the higher the pitch.

5. Answer: (c) less than 20 Hz

Explanation: The range of frequency of subsonic vibration is less than 20 Hz. They cannot be perceived by the human ear. They are also referred to as infrasonic vibrations.

6. Answer: (a) hearing organ

Explanation: The cochlea, the hearing organ, is located inside the inner ear. The snail-like cochlea is made up of three fluid-filled chambers that spiral around a bony core, which contains a central channel called the cochlear duct. Inside the cochlear duct is the main hearing organ, the spiral-shaped organ of the Corti.

7. Answer: (c) 60 vibrations per minute

Explanation: Frequency is the rate at which the current changes its direction per second. One hertz is equal to one cycle per second and therefore 1 hertz is equal to 60 vibrations per minute.

8. Answer: (d) vacuum

Explanation: Sound can not travel through a vacuum. All the other options are given in the question, air, water, and iron sound can travel through them. Sound needs a medium to travel and all the other option like air, water, and iron provide a medium to the sound to travel through them.

9. Answer: (b) sonic sound

Explanation: The audio frequency is called audible frequency. Frequency is expressed in SI unit hertz (Hz). Sound below this audible range is called sub-sonic and the sound above this range is called ultrasonic.

10. Answer: (c) 0.2 sec

Explanation: Time period of pendulum = 0.2 seconds. Hence, the time period of the pendulum as per the given information is 0.2 seconds.

11. Answer: (c) amplitude

Explanation: Thus, the loudness of a sound depends on the amplitude which determines its loudness and volume. ∴ The loudness of the sound depends on its Amplitude. 

12. Answer: (a) frequency

Explanation: The number of vibrations exhibited by a vibrating particle in one second is called its frequency.

13. Answer: (d) Vibrating objects only

Explanation: Sound is produced by Vibrating objects only.

14. Answer: (c) Oscillatory motion

Explanation: A type of motion in which a particle vibrates about a fixed point is called vibratory motion. A type of motion in which a particle moves to and fro about a fixed point is called oscillatory motion.

15. Answer: (b) Hertz

Explanation: Frequency is expressed in Hertz.

16. Answer: (c) 80 dB

Explanation: When the loudness of a sound exceeds 80 dB, it becomes painful and intolerable.

17. Answer: (c) loud

Explanation: The large amplitude of sound vibrations will produce a loud sound. The intensity of sound is identified by loudness. The loudness of sound is proportional to the square of the amplitude of the vibration producing the sound. If the amplitude of vibration is large, the sound produced is loud.

18. Answer: (c) Male vocal cord is longer

Explanation: The voice of a man is heavy compared to a woman because the hormone testosterone elongates the vocal cord.

19. Answer: (a) its amplitude

Explanation: Loudness is directly proportional to the amplitude of sound waves. If the amplitude is high then the sound will be louder and the sound will be feeble if the amplitude is low.

20. Answer: (a) 0.02 s

Explanation: If an object is vibrating at 50 hertz

50 = 1/T

T = 1/50

T = 0.02s

Its time period will be 0.02 sec

21. Answer: (d) solids, liquids, and gases

Explanation: This movement is called vibration. Sound travels more quickly through solids than through liquids and gases because the molecules of a solid are closer together. Hence, sounds can travel in solids, liquids, and gases.

22. Answer: (c) vibrating air column

Explanation: A shehnai produces sound from a vibrating air column. A drum produces sound from a vibrating stretched membrane. The frequency of oscillations is the number of oscillations per second.

23. Answer: (c) Faint

Explanation: Amplitude is the magnitude of the sound produced. Therefore, if the magnitude of amplitude is small then the sound produced is faint, or if the amplitude is high then the sound produced is loud.

24. Answer: (c) Diabetes

Explanation: Diabetes is not caused by noise pollution, as diabetes is caused due to lack of insulin in the human body.

25. Answer: (b) shrill

Explanation: A high-pitched sound is called a shrill sound while a low-pitched sound is called a deep sound. Therefore, an object vibrating with high frequency produces a high-frequency sound wave, that is, it produces a shrill or high pitched sound.

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