Sound Test

Result

Sound Test - 66

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

Both the amplitude and the frequency of a sound wave decrease. What happens to the sound heard?

A
The sound is louder and has a higher pitch

B
The sound is louder and has a lower pitch

C
The sound is quieter and has a higher pitch

D
The sound is quieter and has a lower pitch
Solution
- The loudness of a sound depends upon the amplitude. If the amplitude of sound decreases the loudness will also decrease.
- Also, the pitch of sound depends upon the frequency of sound. If the frequency of sound decreases the pitch of sound will also decrease. In simple words, the shrillness of sound will decrease.
Hence the sound will be quieter and has a lower pitch.
Question 2
1 / -0

A musical instrument is producing a continuous note. This note can not be heard by a person having a normal hearing range. This note must then be passing through:

A
water

B
wax

C
vacuum

D
empty vessel

Solution

Sound is a mechanical wave and it needs a medium for propagation.
The vacuum does not allow sound to propagate. Hence the note must be passing through vacuum.
Option (C) is correct.
Question 3
1 / -0

If the speed of a wave is $$340\, m/s$$ and its frequency is $$1700\, Hz,$$ then $$\lambda$$ for this wave in cm will be:

A
$$2$$

B
$$0.2$$

C
$$20$$

D
$$200$$

Solution

We know
$$V=f\times \lambda$$
Given:
$$V=340m/s\\f=1700Hz\\ \lambda=\dfrac{v}{f}\\ \lambda=\dfrac{340}{1700}\\ \lambda=0.2m=20cm$$
Question 4
1 / -0

The audible range for a normal human being is :

A
$$ 10 $$ Hz to $$ 20, 000 $$ Hz

B
$$ 20 $$ Hz to $$ 20 $$ KHz

C
$$ 10 $$ Hz to $$ 50 $$ KHz

D
$$ 20 $$ Hz to $$ 1000 $$ Hz

Solution

The audible range for a normal human being is $$ 20 $$ Hz to $$ 20 $$ KHz
Question 5
1 / -0

The loudness of sound is determined by the

A
Amplitude of vibration

B
The ratio of amplitude and frequency of vibration

C
Frequency of vibration

D
Product of amplitude and frequency of vibration

Solution

Loudness is directly proportional to amplitude of sound waves.
Question 6
1 / -0

We can hear sound of frequency

A
$$ 10 \,Hz $$

B
$$ 500 \,Hz $$

C
$$ 100,000\,Hz $$

D
$$ 50,000\,Hz $$

Solution

People can hear sounds at frequencies from about $$20\ Hz$$ to $$20,000\ Hz$$, though we hear sounds best from $$1,000\ Hz$$ to $$5,000\ Hz$$, where human speech is centered.

So, option B is correct as it is in the range from $$20\ Hz$$ to $$20,000Hz$$.
Question 7
1 / -0

Wavelength is measured in

A
kg

B
second

C
litre

D
meter

Solution

Wavelength is the distance between identical points (adjacent crests) in the adjacent cycles of a waveform signal propagated in space or along the wire.

Hence the unit of distance will be same as wavelength .

So, wavelength is measure in meter.
Question 8
1 / -0

The wavelength of ultrasonic waves in air is of the order of

A
$$100\ cm $$

B
$$ 10^{-8} \mathrm{cm} $$

C
$$ 10^{5} \mathrm{cm} $$

D
$$ 1.7\ cm $$

Solution

The frequency ($$\nu$$) of an ultrasonic wave is $$20\ kHz$$.
The speed ($$v$$) of an ultrasonic wave in air is $$340\ m/s$$.
We know that, $$v=\nu \times \lambda$$, where $$\lambda$$ is the wavelength.
$$\therefore \lambda=\dfrac{v}{\nu}=\dfrac{340}{20\times10^3}=17\times10^{-3}\ m = 1.7\ cm$$
Question 9
1 / -0

Sound travels in rocks in the form of

A
Longitudinal elastic waves only

B
Transverse elastic waves only

C
Both longitudinal and transverse elastic waves

D
Non-elastic waves

Solution

Sound travels in rocks in the form of both longitudinal and transverse waves, but in air, sound travels only in the form of longitudinal waves.
Question 10
1 / -0

A man can hear the sound of frequency:

A
$$1\,Hz$$

B
$$1000\,Hz$$

C
$$200\,kHz$$

D
$$5\,MHz$$

Solution

Frequencies in the range $$20 \ Hz-20 \ kHz$$ are audible to humans. Hence, option B $$1000 \ Hz$$ is correct.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Sound Test - 66

Result

Sound Test - 66

Score

-

Rank

-

SHARING IS CARING

Question 1

The sound is louder and has a higher pitch

The sound is louder and has a lower pitch

The sound is quieter and has a higher pitch

The sound is quieter and has a lower pitch

Solution

Question 2

water

wax

vacuum

empty vessel

Solution

Question 3

$$2$$

$$0.2$$

$$20$$

$$200$$

Solution

Question 4

$$ 10 $$ Hz to $$ 20, 000 $$ Hz

$$ 20 $$ Hz to $$ 20 $$ KHz

$$ 10 $$ Hz to $$ 50 $$ KHz

$$ 20 $$ Hz to $$ 1000 $$ Hz

Solution

Question 5

Amplitude of vibration

The ratio of amplitude and frequency of vibration

Frequency of vibration

Product of amplitude and frequency of vibration

Solution

Question 6

$$ 10 \,Hz $$

$$ 500 \,Hz $$

$$ 100,000\,Hz $$

$$ 50,000\,Hz $$

Solution

Question 7

kg

second

litre

meter

Solution

Question 8

$$100\ cm $$

$$ 10^{-8} \mathrm{cm} $$

$$ 10^{5} \mathrm{cm} $$

$$ 1.7\ cm $$

Solution

Question 9

Longitudinal elastic waves only

Transverse elastic waves only

Both longitudinal and transverse elastic waves

Non-elastic waves

Solution

Question 10

$$1\,Hz$$

$$1000\,Hz$$

$$200\,kHz$$

$$5\,MHz$$

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.