Question 1
Question: When a wave travels through a medium ______.
| 1. | particles are transferred from one place to another |
| 2. | energy is transferred in a periodic manner |
| 3. | energy is transferred at a constant speed |
| 4. | none of the above statements is applicable |
Answer: 3
Question 2
Question: The minimum distance between the source and the reflector, so that an echo is heard is approximately equal to ______.
| 1. | 10 m |
| 2. | 17 m |
| 3. | 34 m |
| 4. | 50 m |
Answer: 2
Question 3
Question: Bats detect the obstacles in their path by receiving the reflected ______.
| 1. | infrasonic waves |
| 2. | radio waves |
| 3. | electro-magnetic waves |
| 4. | ultrasonic waves |
Answer: 4
Question 4
Question: When sound travels through air, the air particles ______.
| 1. | vibrate along the direction of wave propagation |
| 2. | vibrate but not in any fixed direction |
| 3. | vibrate perpendicular to the direction of wave propagation |
| 4. | do not vibrate |
Answer: 1
Question 5
Question: The relation between wave velocity 'v', frequency 'f ', and wavelength 'l' is ______.
| 1. |  |
| 2. |  |
| 3. |  |
| 4. |  |
Answer: 2
Question 6
Question: The frequency of a wave travelling at a speed of 500 ms-1 is 25 Hz. Its time period will be ______. 
| 1. | 20 s |
| 2. | 0.05 s |
| 3. | 25 s |
| 4. | 0.04 s |
Answer: 4
Question 7
Question: The amplitude of a wave is ______.
| 1. | the distance the wave moves in one second |
| 2. | the distance the wave moves in one time period of the wave |
| 3. | the maximum distance moved by the medium particles on either side of the mean position |
| 4. | the distance equal to one wave length |
Answer: 3
Question 8
Question: Which of the following is not a characteristic of a musical sound?
| 1. | Pitch |
| 2. | Wavelength |
| 3. | Quality |
| 4. | Loudness |
Answer: 2
Question 9
Question: Sound waves do not travel through
| 1. | solids |
| 2. | liquids |
| 3. | gases |
| 4. | vacuum |
Answer: 4
Question 10
Question: The physical quantity, which oscillates in most waves, is
| 1. | mass |
| 2. | energy |
| 3. | amplitude |
| 4. | wavelength |
Answer: 3
Question 11
Question: Sound waves are
| 1. | longitudinal |
| 2. | transverse |
| 3. | partly longitudinal and partly transverse |
| 4. | sometimes longitudinal and sometimes transverse |
Answer: 1
Question 12
Question: The frequency which is not audible to the human ear is
| 1. | 50 Hz |
| 2. | 500 Hz |
| 3. | 5000 Hz |
| 4. | 50000 Hz |
Answer: 4
Question 13
Question: The speed of sound in medium depends upon
| 1. | amplitude |
| 2. | frequency |
| 3. | wavelength |
| 4. | properties of the medium |
Answer: 4
Question 14
Question: Which of the following will remain unchanged when a sound wave travels in air or in water?
| 1. | Amplitude |
| 2. | Wavelength |
| 3. | Frequency |
| 4. | Speed |
Answer: 3
Question 15
Question: A sound source sends waves of 400 Hz. It produces waves of wavelength 2.5 m. The velocity of sound waves is
| 1. | 100 m/s |
| 2. | 1000 m/s |
| 3. | 10000 m/s |
| 4. | 3000 km/s |
Answer: 2
Question 16
Question: The time period of a vibrating body is 0.05 s. The frequency of waves it emits is
| 1. | 5 Hz |
| 2. | 20 Hz |
| 3. | 200 Hz |
| 4. | 2 Hz |
Answer: 2
Question 17
Question: A source of frequency of 500 Hz emits waves of wavelength 0.4 m, how long does the waves take to travel 600 m?
| 1. | 3 s |
| 2. | 6 s |
| 3. | 9 s |
| 4. | 12 s |
Answer: 1
Question 18
Question: Sound and light waves both
| 1. | have similar wavelength |
| 2. | obey the laws of reflection |
| 3. | travel as longitudinal waves |
| 4. | travel through vacuum |
Answer: 2
Question 19
Question: The method of detecting the presence, position and direction of motion of distant objects by reflecting a beam of sound waves is known as _____.
| 1. | RADAR |
| 2. | SONAR |
| 3. | MIR |
| 4. | CRO |
Answer: 2
Question 20
Question: The technique used by bats to find their way or to locate food is _______.
| 1. | SONAR |
| 2. | RADAR |
| 3. | Echolocation |
| 4. | Flapping |
Answer: 3
Question 21
Question: An ultrasonic wave is sent from a ship towards the bottom of the sea. It is found that the time interval between the sending and receiving of the wave is 1.6 s. What is the depth of the sea, if the velocity of sound in the seawater is 1400 m/s?
| 1. | 1120 m |
| 2. | 560 m |
| 3. | 1400 m |
| 4. | 112 m |
Answer: 1
Question 22
Question: An example for mechanical wave.
| 1. | Radio wave |
| 2. | Light wave |
| 3. | Infrared radiation |
| 4. | Sound wave |
Answer: 4
Question 23
Question: Which of the following quantities is transferred during wave propagation?
| 1. | Speed |
| 2. | Mass |
| 3. | Matter |
| 4. | Energy |
Answer: 4
Question 24
Question: If a vibrator strikes the water 10 times in one second, then the frequency of wave is _________.
| 1. | 10 Hz |
| 2. | 0.5 Hz |
| 3. | 5 Hz |
| 4. | 0.1 Hz |
Answer: 1
Question 25
Question: Unit of wavelength is __________.
| 1. | newton |
| 2. | erg |
| 3. | dyne |
| 4. | angstrom |
Answer: 4
Question 26
Question: The distance between a compression and the next rarefaction of a longitudinal wave is __________.
| 1. |  |
| 2. | 2l |
| 3. |  |
| 4. |  |
Answer: 3
Question 27
Question: SI Unit of time period is __________.
| 1. | second |
| 2. | hour |
| 3. | minute |
| 4. | nanosecond |
Answer: 1
Question 28
Question: The vibrations or the pressure variations inside the inner ear are converted into electrical signals by the_________.
| 1. | cochlea |
| 2. | tympanic membrane |
| 3. | pinna |
| 4. | anvil |
Answer: 1
Question 29
Question: Vibrations inside the ear are amplified by the three bones namely the _________ in the middle ear.
| 1. | hammer, anvil and stirrup |
| 2. | hammer, anvil and pinna |
| 3. | hammer, cochlea and stirrup |
| 4. | auditory bone, anvil and stirrup |
Answer: 1
Question 30
Question: The persistence of audible sound due to the successive reflections from the surrounding objects even after the source has stopped to produce that sound is called _________.
| 1. | reflection |
| 2. | echo |
| 3. | reverberation |
| 4. | rarefaction |
Answer: 3
