Online Test — Sound
25 Questions • 15 min • Chapter MCQ
15:00
Question 1 of 25
Sound is produced by objects that:
Glow
Vibrate
Melt
Float
Explanation: Sound is produced by vibrating objects.
Question 2 of 25
In humans, sound is produced by the:
Lungs
Vocal cords
Heart
Stomach
Explanation: The vocal cords vibrate as air passes over them, producing the voice.
Question 3 of 25
Sound travels through a medium in the form of:
Light rays
Waves
Heat only
Magnets
Explanation: Sound travels as waves through a medium.
Question 4 of 25
Sound cannot travel through a:
Solid
Liquid
Gas
Vacuum
Explanation: A vacuum has no particles to carry the vibration, so sound cannot travel.
Question 5 of 25
The bell-in-a-jar experiment shows that sound needs a:
Battery
Medium to travel
Light source
Magnet
Explanation: As air is removed, the sound fades, showing sound needs a medium.
Question 6 of 25
The loudness of a sound depends on its:
Frequency
Amplitude
Quality
Speed
Explanation: Loudness depends on the amplitude of the vibration.
Question 7 of 25
The pitch of a sound depends on its:
Amplitude
Frequency
Loudness
Colour
Explanation: Pitch depends on the frequency of the vibration.
Question 8 of 25
Frequency is measured in:
Decibel
Hertz
Newton
Pascal
Explanation: Frequency is the number of vibrations per second, measured in hertz (Hz).
Question 9 of 25
A higher frequency produces a sound of:
Lower pitch
Higher pitch
Less loudness
More amplitude
Explanation: A higher frequency gives a higher pitch.
Question 10 of 25
The characteristic that lets us tell a flute from a violin is:
Loudness
Pitch
Quality (timbre)
Speed
Explanation: Quality (timbre) distinguishes sounds of the same loudness and pitch.
Question 11 of 25
Sound travels fastest through:
Gases
Liquids
Solids
Vacuum
Explanation: Sound travels fastest in solids, whose particles are tightly packed.
Question 12 of 25
The approximate speed of sound in air is:
34 m/s
340 m/s
3400 m/s
3 m/s
Explanation: The speed of sound in air is about 340 m/s.
Question 13 of 25
The repetition of a sound due to reflection is called a/an:
Vibration
Echo
Pitch
Frequency
Explanation: An echo is a repeated sound caused by reflection off a distant surface.
Question 14 of 25
We see lightning before hearing thunder because:
Sound is faster
Light travels much faster than sound
Thunder comes first
Light is slower
Explanation: Light travels much faster than sound, so it reaches us first.
Question 15 of 25
SONAR and ultrasound scans are based on the ______ of sound.
Production
Reflection
Absorption only
Colour
Explanation: They use the reflection of sound (echoes) to detect objects or form images.
Question 16 of 25
The human audible range of frequencies is about:
2–20 Hz
20–20,000 Hz
20,000–40,000 Hz
1–10 Hz
Explanation: Humans can hear sounds from about 20 Hz to 20,000 Hz.
Question 17 of 25
Sound with a frequency below 20 Hz is called:
Audible
Infrasonic
Ultrasonic
Echo
Explanation: Sound below 20 Hz is infrasonic (too low for humans).
Question 18 of 25
Sound with a frequency above 20,000 Hz is called:
Audible
Infrasonic
Ultrasonic
Loud
Explanation: Sound above 20,000 Hz is ultrasonic (too high for humans).
Question 19 of 25
Which animal uses ultrasonic sound to navigate in the dark?
Elephant
Bat
Whale
Cow
Explanation: Bats use ultrasound and its echoes (echolocation) to navigate.
Question 20 of 25
A "silent" dog whistle works because it produces:
Infrasound humans hear
Ultrasound dogs hear but humans don't
A bright light
No sound at all
Explanation: The whistle produces ultrasound, above human hearing but within a dog's range.
Question 21 of 25
The presence of excessive or unwanted harmful sound is called:
Music
Noise pollution
Echo
Vibration
Explanation: Noise pollution is excessive or unwanted (harmful) sound in the surroundings.
Question 22 of 25
Which of these is a major source of noise pollution?
Trees
Vehicle horns
Sunlight
Rain only
Explanation: Vehicle horns and engines are major sources of noise pollution.
Question 23 of 25
A harmful effect of noise pollution on health is:
Better sleep
Loss of hearing
Improved focus
More energy
Explanation: Long exposure to loud noise can cause loss of hearing and other harm.
Question 24 of 25
A sound that is unpleasant or unwanted is called a:
Musical sound
Noise
Echo
Pitch
Explanation: An unpleasant or unwanted sound is called a noise.
Question 25 of 25
Planting trees along roads helps to:
Increase noise
Absorb and reduce noise
Produce sound
Block sunlight only
Explanation: Trees absorb some sound, helping to reduce noise pollution.