10th Class Physics Chapter 2 Short Questions with Answers Solved

Question: 1

Define loudness? On what factors loudness depends.

Answer: 1

1-21

"Loudness is the characteristics of sound by which loud and faint sounds cab be distinguished". Loudness depends upon a number of factors. Such as.

i. Amplitude of the vibrating body

ii. Araa of the vibrating body

iii. Distance from the vibrating body

iv. Physical condition of ear.

Question: 2

On what factors pitch depends.

Answer: 2

2-21

It depends upon the frequency. A higher pitch menas higher frequcney and vice verse.

Question: 3

Define wavelength of sound wave.

Answer: 3

3-21

Distance between two consecutive compressions or rarefactions is called the wavelengths of sound wave.

Question: 4

What is speed

Answer: 4

4-21

The distance covered in unit time is called speed.

Question: 5

Explain that noise is a nuisance?

Answer: 5

5-21

Noise is a nuisance because it causes offence annoyance, trouble or injury.

Question: 6

Difference Between the loudness and intensity of sound.

Answer: 6

6-21

Loudness: i. Characteristics of sound by which we can distinguish between loud and faint Sounds is called loudness.

ii. It is not physical quantity.

Question: 7

What is frequency.

Answer: 7

7-21

The number of vibration s per cycle of a vibrating body n one second is called frequency.

Question: 8

Why sound waves are called mechanical waves?

Answer: 8

8-21

Sound waves are called mechanical waves because they require material medium for their propagation.

Question: 9

Why ultrasound is useful in medical field?

Answer: 9

9-21

Ultrasonic waves carry more energy and short wavelength therefore ultrasonic waves are used to diagnose and treat different ailments.

Question: 10

What is diaphragm?

Answer: 10

10-21

the chest piece consists of a plastic disc called diaphragm in stethoscope.

Question: 11

Difference between echo and reflection of sound?

Answer: 11

11-21

the echo is formed through reflection but the reflection does not form echo. All sounds reflect back but it is not necessary that all reflections produce echo.

Question: 12

Why the voice of women is shriller than that of men?

Answer: 12

12-21

The frequency of the voice of ladies is higher than that of men.There fore, the voice of ladies is shrill and of high pitch.

Question: 13

Difference between frequency and pitch.

Answer: 13

13-21

Frequency: The number of vibration completed in one second is called frequency. Its unit is hertz.(Hz)

Question: 14

Which instrument is used to see the sound waves?

Answer: 14

14-21

By using an"Oscilloscope" we can see sound waves.

Question: 15

Define echo os sound.

Answer: 15

15-21

When sound is incident on the surface of a medium it bounces back into the first medium, This phenomenon is called echo or reflection of sound.

Question: 16

Define intensity and its unit.

Answer: 16

16-21

Sound energy passing per second through a unit area held perpendicular to the direction of propagation of sound waves is called intensity of sound.

Question: 17

What is musical sound?

Answer: 17

17-21

Sounds which are pleasant to our ears are called musical sounds. e.g. sounds of guitar and violin.

Question: 18

What is audible frequency range?

Answer: 18

18-21

The range of the frequencies which a human ear can hear is called the audible frequency range.

Question: 19

What is SONAR?

Answer: 19

19-21

SONAR is "sound navigation and ranging". It is a technique used to estimate the distance of object from the ocean surface.

Question: 20

What are sources of noise pollution?

Answer: 20

20-21

Transportation equipment, heavy machinery, loud vehicles horns and alarms are the source of noise pollution.

Question: 21

Difference between Quality and pitch.

Answer: 21

21-21

the property of sound by which we can distinguish between two sounds of same loudness and pitch is called quality.

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10th Class Chapter 2 Physics Short Questions

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