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Science M.C.Q. [1 M]

Sound · Gujarat Board (GSEB) STD 9 (GSEB - English Medium). 28 questions.

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M.C.Q. [1 M]

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28 questions · timed · auto-graded

Question 11 Mark
What type of waves are generated by SONAR device fixed to a fishing ship?
  1. Water waves.
  2. Radio waves.
  3. Sound waves.
  4. Infrared waves.
Answer
  1. Sound waves.

Explanation:

SONAR uses ultrasonic sound waves.

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Question 21 Mark
One of the following can hear infrasound. This one is:
  1. Dog.
  2. Bat.
  3. Rhinoceros.
  4. Humans.
Answer
  1. Rhinoceros.

Explanation:

Rhinoceros can hear infrasonic sounds.

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Question 31 Mark
The speed of highly penetrating ultrasonic waves is:
  1. Lower than those of audible sound waves.
  2. Higher than those of audible sound waves.
  3. Much higher than those of audible sound waves.
  4. Same as those of audible sound waves.
Answer
  1. Same as those of audible sound waves.

Explanation:

The speed of sound wave in air is independent of its frequency.

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Question 41 Mark
When we change a feeble sound to a loud sound, we increase its:
  1. Frequency.
  2. Amplitude.
  3. Velocity.
  4. Wave length.
Answer
  1. Amplitude.

Explanation:

Loudness: if a sound is directly proportional to its amplitude.

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Question 51 Mark
Which of the following device does not work on the multiple reflections of sound waves?
  1. Stethoscope.
  2. Hydrophone.
  3. Soundboard.
  4. Megaphone.
Answer
  1. Hydrophone.

Explanation:

Hydrophone does not work on the principle of multiple reflections.

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Question 61 Mark
Before playing the orchestra in a musical concert, a sitarist tries to adjust the tension and pluck the strings suitably. By doing so he is adjusting:
  1. Intensity of sound only.
  2. Amplitude of sound only.
  3. Frequency of the sitar string with the frequency of other musical instruments.
  4. Loudness of sound.
Answer
  1. Frequency of the sitar string with the frequency of other musical instruments.

Explanation:

A sitarist tries to adjust the tension in the strings as to adjust the frequency of sitar with the frequency of other musical instruments.

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Question 71 Mark
We can distinguish between the musical sounds produced by different singers on the basis of the characteristic of sound called:
  1. Frequency.
  2. Timbre.
  3. Pitch.
  4. Loudness.
Answer
  1. Pitch.

Explanation:

We can distinguish between the sounds of different singer by their pitch.

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Question 81 Mark
When the pitch of note produced by a harmonium is lowered, then the wavelength of the note:
  1. Decreases.
  2. First decreases and then increases.
  3. Increases.
  4. Remains the same.
Answer
  1. Increases.

Explanation:

When the pitch of the harmonium is lowered, then the frequency is also lowered. Wavelength is inversely proportional to the frequency.

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Question 91 Mark
The maximum speed of vibrations which produce audible sound will be in:
  1. Dry air.
  2. Sea water.
  3. Ground glass.
  4. Human blood.
Answer
  1. Ground glass.

Explanation:

Velocity of the longitudinal wave is directly proportional to the density of the medium.

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Question 101 Mark
If the speed of a wave is 340m/s and its frequency is 1700Hz, then $\lambda$ for this wave in cm will be:
  1. 2
  2. 0.2
  3. 20
  4. 200
Answer
  1. 20

Explanation:

Given: Velocity of the wave = 340m/s

Frequency of the wave = 1,700Hz

So, we can find the wavelength by $\lambda=\frac{\text{v}}{\text{f}},$

Where $\lambda$ is the wavelength, v the velocity, and f the frequency.

So,

$\lambda=\frac{340}{1700}\text{m}$

$=20\text{cm}$

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Question 111 Mark
The ultrasound waves can penetrate into matter to a large extent because they have:
  1. Very high speed.
  2. Very high frequency.
  3. Very high wavelength.
  4. Very high amplitude.
Answer
  1. Very high frequency.

Explanation:

Ultrasound waves can enter the metal surfaces because of their high frequency.

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Question 121 Mark
Which one of the following does not consist of transverse waves?
  1. Light emitted by a CFL.
  2. TV signals from a satellite.
  3. Ripples on the surface of a pond.
  4. Musical notes of an orchestra.
Answer
  1. Musical notes of an orchestra.

Explanation:

The waves produced by musical instruments are longitudinal in nature.

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Question 131 Mark
Which of the following frequency of sound can be generated by a vibrating simple pendulum as well as by the vibrating vocal cords of a rhinoceros?
  1. 5kHz
  2. 25Hz
  3. 10Hz
  4. 15,000Hz
Answer
  1. 10Hz

Explanation:

Rhinoceros can produce infrasonic sound waves.

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Question 141 Mark
The sound waves travel fastest:
  1. In solids.
  2. In liquids.
  3. In gases.
  4. In vacuum.
Answer
  1. In solids.

Explanation:

Velocity of the longitudinal wave is directly proportional to the density of the medium.

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Question 151 Mark
A key of mechanical piano is first struck gently and then struck again but much harder this time. In the second case:
  1. Sound will be louder but pitch will not be different.
  2. Sound will be louder and the pitch will also be higher.
  3. Sound will be luder but pitch will be lower.
  4. Both loudness and pitch will remain unaffected.
Answer
  1. Sound will be louder but pitch will not be different.

Explanation:

By pressing the key gently and then again by, some force, increasing the amplitude of the wave, but the frequency remains the same.

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Question 161 Mark
Sound travels in air:
  1. If particles of medium travel from one place to another.
  2. If there is no moisture in the atmosphere.
  3. If disturbance moves.
  4. If both, particles as well as disturbance move from one place to another.
Answer
  1. If disturbance moves.

Explanation:

Sound is a longitudinal wave in which the disturbance created by the vibrating body is carried out by the medium without the actual movement of the medium particles.

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Question 171 Mark
The velocities of sound waves in four media P. Q, R and S are 18,000km/h, 900km/h, 0km/h, and 1200km/h respectively. Which medium could be a liquid substance?
  1. P
  2. Q
  3. R
  4. S
Answer
  1. S

Explanation:

Velocity of sound in liquid medium is intermediate to the velocities in solid and gas medium.

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Question 181 Mark
The speeds of sound in four different media are given below. Which of the following is the most likely speed in m/s with which the two under water whales in a sea talk to each other when separated by a large distance?
  1. 340
  2. 5170
  3. 1280
  4. 1530
Answer
  1. 1530m/s

Explanation:

The speed of water in sound is 1530m/s.

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Question 191 Mark
Which of the following vibrates when a musical note is produced by the cymbals in an orchestra?
  1. Stretched strings.
  2. Stretched membranes.
  3. Metal plates.
  4. Air columns.
Answer
  1. Metal plates.

Explanation:

The metal plates vibrate when a musical note is produced by the cymbals.

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Question 201 Mark
An echo-sounder in a trawler (fishing boat) receives an echo from a shoal of fish 0.4s after it was sent. If the speed of sound in water is 1500m/s, how deep is the shoal?
  1. 150m
  2. 300m
  3. 600m
  4. 7500m
Answer
  1. 300m

Explanation:

Time taken to list the sent signal is 0.4s.

Speed of sound in water is 1,500m/s.

So,

$=\frac{1500\times0.4}{2}$

$=300\text{m}$

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Question 211 Mark
A musical instrument is producing a continuous note. This note cannot be heard by a person having a normal hearing range. This note must then be passing through:
  1. Water.
  2. Wax.
  3. Vacuum.
  4. Empty vessel.
Answer
  1. Vacuum.

Explanation:

Sound waves cannot propagate through vacuum.

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Question 221 Mark
At 20°C, the minimum distance of a person from a sound reflecting surface to hear an echo is:
  1. 12.2m
  2. 17.2m
  3. 15.2m
  4. 34.4m
Answer
  1. 17.2m

Explanation:

At room temperature, the minimum distance for echo is 17.2m.

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Question 231 Mark
Which kind of sound is produced in an earthquake before the main shock wave begins?
  1. Ultrasound.
  2. Infrasound.
  3. Audible sound.
  4. None of the above.
Answer
  1. Infrasound.

Explanation:

Infrasonic waves are formed before the major shock of earthquake.

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Question 241 Mark
‘Note’ os a sound:
  1. Of a mixture of several frequencies.
  2. Of mixture of only two frequencies.
  3. Of a single frequency.
  4. Always unpleasant to listen to.
Answer
  1. Of a single frequency.

Explanation:

Note is a sound of single frequency.

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Question 251 Mark
The frequencies of four sound waves are given below. Which of these sound waves can be used to measure the depth of sea by the echo method?
  1. 15,000Hz
  2. 10kHz
  3. 50kHz
  4. 10,000Hz
Answer
  1. 50kHz

Explanation:

Depth of sea can be measured using ultrasonic waves.

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Question 261 Mark
Which of the following can produce longitudinal waves as well as transverse waves under different conditions?
  1. Water.
  2. TV transmitter.
  3. Slinky.
  4. Tuning fork.
Answer
  1. Slinky.

Explanation:

Slinky can produce longitudinal as well as transverse waves.

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Question 271 Mark
Which of the following statement best describe frequency?
  1. The maximum disturbance caused by a wave.
  2. The number of complete vibrations per second.
  3. The distance between one crest of a wave and the next one.
  4. The distance travelled by a wave per second.
Answer
  1. The number of complete vibrations per second.

Explanation:

Frequency is defined as number of complete vibrations per second.

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Question 281 Mark
In SONAR we use:
  1. Ultrasonic waves.
  2. Infrasonic waves.
  3. Radio waves.
  4. Audible sound waves.
Answer
  1. Ultrasonic waves.

Explanation:

SONAR uses ultrasonic sound waves.

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