WorksheetsSound- Class 8- Science
Total questions: 20
Worksheet time: 16mins
(a) is a form of energy which creates a sensation in our ears.
Sound can travel through
Solids
Liquids
Gases
Vacuum
None of the above
Sound is produced by
Non-vibrating objects only
Vibrating and non-vibrating objects
Vibrating objects only
None of the above
In humans, sound is produced by
(a) Larynx
(b) Pharynx
Both (a) and (b)
None of the above
How do sounds pass from the outer ear to the brain in humans?
Pinna → Auditory nerve → Hammer → Anvil → Stirrup → Ear drum → Cochlea → Ear canal → Brain
Ear drum → Ear canal → Pinna → Auditory nerve → Cochlea → Hammer → Anvil → Stirrup → Brain
Pinna → Ear canal → Ear drum → Hammer → Anvil → Stirrup → Cochlea → Auditory nerve → Brain
None of the above
An astronaut can't hear his companion at the surface of the moon because there is no medium for sound propagation.
True
False
The pitch of sound depends on:
Frequency
Amplitude
Both of the above
None of the above
Range of audible sound is
More than 20,000Hz
Less than 20Hz
20Hz to 20,000 Hz
More than 20Hz
When amplitude is small, sound produced is
Loud
Feeble
Low pitched
None of the above
Above ________ dB the sound becomes physically painfully.
60
40
120
80
Unwanted and unpleasant sounds are called:
Noise
Noise pollution
Music
Air pollution
Which of the following is not caused due to noise pollution?
Lack of Sleep
Hypertension
Diabetes
Anxiety
The unpleasant or unwanted sound is termed as music.
True
False
An object oscillates 50 times in one second. What would be its frequency?
0.2Hz
0.02Hz
0.002Hz
50Hz
Loudness of sound is determined by
Pitch
Frequency
Amplitude
Time period
The number of oscillations per second is called
Amplitude of oscillation
Pitch of oscillation
Frequency of oscillation
None of the above
Name this organ.
(a)
Two students are at two ends of a room. One of the students claps softly but other student is unable to hear the sound. The student takes a long metal rod and asks his friend to put the ear on the rod at the other end. The student taps the metal rod with the same intensity and the sound is heard by his friend. What can be concluded by this observation?
Particles in air are closer to one another to the sound travels faster.
Particles in air are farther from one another to the sound travels faster.
Particles in a solid substance are closer to one another so the sound travels faster.
Particles in a solid substance are farther from one another to the sound travels faster.
The two vocal cords in humans are stretched across the larynx leaving a narrow slit between them for the passage of air. When the lungs force air through the slit, the vocal cords rotate, producing sound.
True
False
1. → (i)
2. → (iii)
3. → (iv)
4. → (ii)
1. → (i)
2. → (iv)
3. → (ii)
4. → (iii)
1. → (iv)
2. → (iii)
3. → (i)
4. → (ii)
1. → (iv)
2. → (i)
3. → (iii)
4. → (ii)
