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Important Questions: Sound - Class 8 MCQ


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20 Questions MCQ Test Science Class 8 - Important Questions: Sound

Important Questions: Sound for Class 8 2024 is part of Science Class 8 preparation. The Important Questions: Sound questions and answers have been prepared according to the Class 8 exam syllabus.The Important Questions: Sound MCQs are made for Class 8 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Important Questions: Sound below.
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Important Questions: Sound - Question 1

When we say that sound travels in a medium, what do we mean?

Detailed Solution for Important Questions: Sound - Question 1

 sound is a mechanical wave that needs a material medium to travel.

Important Questions: Sound - Question 2

Which of the following correctly represents the speed of sound in solids, liquids and gases in ascending order?

Detailed Solution for Important Questions: Sound - Question 2

The speed of sound in ascending order is minimum in gases, lesser in liquid and maximum in solids.
Gas :- 330-340 m/s
Liquid :- 1500 m/s
Solid :- 5000 m/s

Important Questions: Sound - Question 3

A person can hear an approaching train when he presses his ear to the railway track faster than one who simply stands on the tracks. What makes this possible?

Detailed Solution for Important Questions: Sound - Question 3

The velocity of sound in solids (railway tracks) is faster than that in air.

Important Questions: Sound - Question 4

A person can be identified by his voice. What determines this distinguishing feature?
(i) Amplitude
(ii) Pitch
(iii) Loudness

Detailed Solution for Important Questions: Sound - Question 4

The characteristics of a sound are :

(i) Loudness or intensity : it distinguishes between a loud or faint sound , and intensity , depends upon amplitude of sound waves .

(ii) Pitch : it distinguishes a sharp sound from a dull sound and pitch depends upon frequency.

(iii) Quality: it distinguishes between sounds generated by two sources .

Important Questions: Sound - Question 5

In human beings, which of the following produces the sound?

Detailed Solution for Important Questions: Sound - Question 5

Sound is produced by larynx or voice box.

Important Questions: Sound - Question 6

An object oscillates 50 times in one second. What is its frequency?

Detailed Solution for Important Questions: Sound - Question 6

The number of oscillations per second is called the frequency of oscillation, i.e. 50 Hz.

Important Questions: Sound - Question 7

In which of the three media does sound travel the fastest?

Detailed Solution for Important Questions: Sound - Question 7

Sound travels the fastest in solids, less in liquids and the least in gases.

Important Questions: Sound - Question 8

Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen. Why?

Detailed Solution for Important Questions: Sound - Question 8

 

Thunder is heard later because the speed of light (flash) is much greater (3×108ms−1) than the speed of sound (330ms−1).

Important Questions: Sound - Question 9

What is the cause for the difference in the voices of men, women and children?

Detailed Solution for Important Questions: Sound - Question 9

The primary cause for the difference in voices between men, women, and children is the difference in the size and shape of their vocal cords. The vocal cords, located within the larynx (voice box), vibrate to produce sound. In men, the vocal cords are typically longer and thicker, resulting in a lower-pitched voice. In women, the vocal cords are shorter and thinner, leading to a higher-pitched voice. Children have smaller vocal cords compared to adults, contributing to their higher-pitched voices. While factors such as the size and shape of the larynx, lungs, and windpipe also play a role, the primary determinant of voice differences is the vocal cords.

Important Questions: Sound - Question 10

Which of the following represents Hertz?

Detailed Solution for Important Questions: Sound - Question 10

Frequency = 1/time period. 

= 1/unitof time = second−1

Important Questions: Sound - Question 11

On what factors does the loudness or intensity of sound depend?

Detailed Solution for Important Questions: Sound - Question 11

Sound depends on the amplitude of the sound wave, distance from the sound source, the density of the medium and the surface area of vibrating bodies.

Important Questions: Sound - Question 12

On what factors does the pitch of sound depend?

Detailed Solution for Important Questions: Sound - Question 12

Pitch of sound depends on its frequency. 

Important Questions: Sound - Question 13

Which of the following produces sound in birds?

Detailed Solution for Important Questions: Sound - Question 13

Birds produce sounds by means of a ring of cartilage called syrinx, present at the beginning of their wind pipe. 

Important Questions: Sound - Question 14

Find the difference between a musical sound and noise.

Detailed Solution for Important Questions: Sound - Question 14

Musical sound is produced by regular vibrations whereas noise is produced by irregular vibrations.

Important Questions: Sound - Question 15

Which of the following are the effects of noise pollution?
(i) Insomnia
(ii) Hypertension
(iii) Hearing impairment

Detailed Solution for Important Questions: Sound - Question 15

Noise pollution is hazardous to health in many ways. Insomnia (lack of sleep), hypertension (high blood pressure) and hearing impairment (temporary or permanent hearing problem) are the effects of noise pollution.

Important Questions: Sound - Question 16

Which of the following frequencies cannot be heard by human beings?

Detailed Solution for Important Questions: Sound - Question 16

Human beings can hear only within the range of 20 Hz to 20 kHz. So, 100 kHz (1,00,000 Hz) cannot be heard.

Important Questions: Sound - Question 17

Identify the three delicate bones in the middle ear.

Detailed Solution for Important Questions: Sound - Question 17

The three delicate bones in the middle ear are the hammer, the anvil and the stirrup.

Important Questions: Sound - Question 18

Identify the nerve that carries the signals from the ear to the brain.

Detailed Solution for Important Questions: Sound - Question 18

The nerve that carries the signals from the ear to the brain is called the auditory nerve.

Important Questions: Sound - Question 19

Which of the following helps human beings in producing sounds?

Detailed Solution for Important Questions: Sound - Question 19

Vocal cords are a band of muscles within the larynx. These muscles vibrate to produce the sound.

Important Questions: Sound - Question 20

What is the number of vibrations made by a body in one second called?

Detailed Solution for Important Questions: Sound - Question 20

Frequency is the number of vibrations that pass through a point in space in one second by a body.

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