MCQ Questions for Class 8 Science Chapter 13 Sound
Here we are providing mcq questions for class 8 science. In this article, we are covering Class 8 Science Chapter 13 Sound.
Table of Contents
Question 1.
The hearing range of human ear is
(a) 20 Hz to 20,000 Hz
(b) less than 20 Hz
(c) more than 20,000 Hz
(d) 20 Hz to 25,000 Hz
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Answer: (a)Question 2.
Sound is a kind of
(a) work
(b) energy
(c) force
(d) pressure
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Answer: (b)Question 3.
Pitch of sound is determined by its
(a) frequency
(b) speed
(c) amplitude
(d) loudness
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Answer: (a)Question 4.
A pendulum oscillates 20 times in 4 seconds. Find its time period.
(a) 0.05 sec.
(b) 0.001 sec.
(c) 0.2 sec.
(d) 0.1 sec.
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Answer: (c)Question 5.
The frequency of subsonic sound is
(a) more than 20 Hz
(b) 100 Hz
(c) less than 20 Hz
(d) more than 20,000 Hz
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Answer: (c)Question 6.
1 hertz is equal to
(a) 1 vibration per minute
(b) 10 vibrations per minute
(c) 60 vibrations per minute
(d) 600 vibrations per minute
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Answer: (c)Question 7.
The voice box is also called as
(a) stomach
(b) heart
(c) larynx
(d) mouth
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Answer: (c)Question 8.
Sound cannot travel through
(a) air
(b) water
(c) iron
(d) vacuum
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Answer: (d)Question 9.
The sound in the audible range is called
(a) ultrasonic sound
(b) sonic sound
(c) subsonic sound
(d) light sound
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Answer: (b)Question 10.
Speed is
(a) Distance travelled / Time
(b) Time / Distance travelled
(c) Distance travelled × Time
(d) Time + Distance travelled
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Answer: (a)Question 11.
Loudness of sound is determined by
(a) pitch
(b) frequency
(c) amplitude
(d) time period
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Answer: (c)Question 12.
The number of vibrations made by a vibrating body in one second is
(a) frequency
(b) noise
(c) loudness
(d) pitch
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Answer: (a)Question 13.
The maximum displacement of a body from its mean position is called
(a) amplitude
(b) oscillation
(c) periodic motion
(d) frequency
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Answer: (a)Question 14.
Sound usually travels through which medium to reach our ears?
(a) Air
(b) Water
(c) Wood
(d) Asbestos
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Answer: (a)Question 15.
The human ear can hear sounds having frequency in range from
(a) 200 to 20,000 Hz
(b) 20 to 2000 Hz
(c) 200 to 2000 Hz
(d) 20 to 20,000 Hz
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Answer: (d)Question 16.
What is the speed of sound in air?
(a) 110 m/s
(b) 220 m/s
(c) 330 m/s
(d) 440 m/s
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Answer: (c)Question 17.
The velocity of sound at 20°C is approximately
(a) 3400 m/sec.
(b) 340 m/sec.
(c) 430 m/sec.
(d) 304 m/sec.
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Answer: (b)Question 18.
What is the length of vocal cords in men?
(a) 5 mm
(b) 10 mm
(c) 15 mm
(d) 20 mm
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Answer: (d)Question 19.
The voice box is also called as
(a) pharynx
(b) throat
(c) larynx
(d) windpipe
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Answer: (c)Question 20.
What is the length of vocal cords in women?
(a) 5 mm
(b) 10 mm
(c) 15 mm
(d) 20 mm
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Answer: (c)Question 21.
A vibrating body should oscillate minimum how many times per second to make a sound audible for humans?
(a) 10 times
(b) 20 times
(c) 30 times
(d) 40 times
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Answer: (b)Question 22.
Cochlea is a part of
(a) hearing organ
(b) sound producing organ
(c) muscular organ
(d) air pollution
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Answer: (a)Question 23.
Speed of sound in solids is the speed of sound in liquids.
(a) same as
(b) greater than
(c) less than
(d) both (b) and (c)
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Answer: (b)Question 24.
If we tighten the strings of an instrument, pitch will be
(a) higher
(b) lower
(c) constant
(d) no pitch
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Answer: (a)Question 25.
Sound having frequency below 20 Hz is called
(a) infrasound
(b) ultrasound
(c) megasound
(d) microsound
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Answer: (a)Question 26.
To and fro or back and forth motion of an object is termed as
(a) frequency
(b) amplitude
(c) vibration
(d) time period
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Answer: (c)Question 27.
The sound above ……………… is physically painful.
(a) 20 dB
(b) 40 dB
(c) 60 dB
(d) 80 dB
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Answer: (d)Question 28.
In dholak, sound is produced due to
(a) stretched membrane
(b) stretched strings
(c) air column
(d) none of these
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Answer: (a)Class 8 Science Chapter 13 Sound
Learning Objectives
- To know about sound and how it is produced.
- To understand the propagation of sound in a medium.
- To learn the types of waves.
- To learn the characteristics of sound.
- To learn the terms related to sound waves – Amplitude, frequency, time period.
- To know the frequency range of hearing in humans.
- To learn about noise pollution and measurements to limit noise pollution.
Importance of Practicing MCQ Questions for Class 8 Science
Solving MCQs can be an effective way for class 8 science students to understand concepts better. Here are some ways in which solving MCQs can help students understand science concepts:
- Encourages active learning: MCQs require students to actively engage with the material and think critically about the concepts they are studying. Rather than simply memorizing information, students must analyze the options presented and choose the most appropriate answer. This helps to reinforce the material in their minds and encourage active learning.
- Provides immediate feedback: MCQs provide immediate feedback to students. When students answer a question incorrectly, they can learn from their mistakes and identify areas where they may need additional support. This feedback is crucial for helping students to identify gaps in their understanding and make corrections quickly.
- Promotes retention of information: MCQs can also help students retain information more effectively. By repeatedly reviewing and answering questions about a particular concept, students can reinforce their understanding of the material and commit it to memory more easily.
- Helps students to organize their knowledge: When students are presented with a series of MCQs on a particular topic, they must organize their knowledge of the subject and identify the most important information. This process helps them to develop a deeper understanding of the material and strengthens their ability to recall key facts and concepts.
- Improves test-taking skills: Finally, solving MCQs can help students develop better test-taking skills. By practicing MCQs, students can learn how to eliminate incorrect answer choices, manage their time effectively, and avoid common mistakes that can cost them points on tests and exams.
Frequently Asked Questions (FAQs)
(1) What is Sound?
Ans. Sound is a form of energy which produces a sensation of hearing in our ears.
(2) How we hear sound?
Ans. Sound is produced by the vibration of an object. The vibrating object vibrates the particles of air surrounding it. This creates a disturbance which is passed to the adjacent particles and the process continues. This is how a sound wave is generated.
Sound waves are not visible. Sound waves reach our eardrum and make it vibrate. (Eardrum is like a stretched rubber sheet). The eardrum sends vibrations to the inner brain. From there, the signal goes to the brain. This is how we hear.
(3) What is Sound Wave?
Ans. A sound wave is a periodic disturbance which requires a material medium for its propagation.
(4) Do sound needs medium for its propagation?
Ans. Yes
(5) What properties medium must possess for the propagation of Sound?
Ans. The medium must possess the following properties for the propagation of waves.
- The medium should be able to return to its original position after being disturbed, i.e., the medium must possess elasticity.
- The medium must be capable of storing energy i.e., the medium must have inertia.
