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Class 8 Science Chapter 11 HOTS Questions - Sound
Q 1. A sound wave travels from east to west, in which direction do the particles of air move?
(A) East – west
(B) North - south
(C) Up and down
(D) None of these
Q 2. In which medium sound travels faster ?
(A) Solid
(B) Liquid
(C) Gas
(D) None of these
Q 3. What is the name of short duration wave?
(A) Pulse
(B) Frequency
(C) Time period
(D) Velocity
Q 4. What is the velocity of sound in water at room temperature?
(A) 1500 m/s
(B) 330 m/s
(C) 1500 km/s
(D) 330 km/s
Q 5. The unit of quantity on which pitch of the sound depends is :
(A) Hertz
(B) metre
(C) metre/second
(D) second
Q 6. The unit of quantity on which loudness of found depends is :
(A) metre
(B) Hertz
(C) metre/second
(D) second
Q 7. Nature of sound wave is :
(A) transverse
(B) longitudinal
(C) electromagnetic
(D) seismec
Q 8. Pitch of high frequency sound is :
(A) high
(B) low
(C) zero
(D) infinite
Q 9. Voice of a friend is recognized by its :
(A) Pitch
(B) quality
(C) Intensity
(D) velocity
Q 10. Sound waves in air are :
(A) Longitudinal waves
(B) Radio waves
(C) Transverse waves
(D) Electromagnetic waves
Ans: . 1-A 2-A 3-A 4-A 5-A 6-A 7-B 8-A 9-B 10-A
Objective: Fill in the blanks:
1. Pitch is the sensation of the ---------- of an emitted sound.
2. A high pitch sound is called a ------ sound
3. A low pitch sound is called a ----------- sound.
4. Loudness of sound wave is directly proportional to -------- amplitude
5. The sound energy transferred per unit area per unit time is called -------- of sound.
6. When a body moves with a speed which is greater than the speed of sound in air, it is said to be traveling at --------------
7. When wound waves traveling in air enter into the medium of water, ------- remains unchanged
8. Sound travels faster as the ------------ of the medium increases by 0.61 m/s with every 1 deg C
9. ----- is an apparatus which is used to find the depth of a sea or to locate the under water things.
10. A sound wave of single frequency is called ---------
Ans:
1. Frequency
2. shrill
3. hoarse
4. Square
5. intensity
6. supersonic speed
7. Frequency
8. temperature
9. Sonar
10.Tone
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FAQs on Class 8 Science Chapter 11 HOTS Questions - Sound
| 1. What is sound and how is it produced? |  |
Ans. Sound is a type of energy that is produced by the vibration of an object. When an object vibrates, it causes the surrounding air molecules to vibrate, which in turn creates pressure waves that travel through the air. These pressure waves are what we hear as sound.
| 2. What factors affect the speed of sound? | |
Ans. The speed of sound is affected by several factors including temperature, humidity, and altitude. Sound travels faster in warmer air, as the air molecules are more spread out, allowing the pressure waves to move more quickly. It also travels faster in humid air, as water molecules are lighter than air molecules and thus allow sound waves to travel faster. Finally, sound travels faster at higher altitudes, as the air pressure is lower and the air molecules are more spread out.
| 3. How does sound travel through different mediums? | |
Ans. Sound waves can travel through different mediums such as air, water, and solids. When sound waves travel through air, they cause the air molecules to vibrate and create pressure waves that move through the air. When sound waves travel through water, they cause the water molecules to vibrate and create pressure waves that move through the water. When sound waves travel through solids, they cause the molecules in the solid to vibrate and create pressure waves that move through the solid.
| 4. What is the difference between loudness and pitch of sound? | |
Ans. Loudness and pitch are two different properties of sound. Loudness refers to the intensity or amplitude of a sound wave, which determines how loud or soft a sound is. Pitch, on the other hand, refers to the frequency of the sound wave, which determines how high or low a sound is. Higher frequency sound waves have a higher pitch, while lower frequency sound waves have a lower pitch.
| 5. How is sound used in everyday life? | |
Ans. Sound is used in many different ways in everyday life, from communication to entertainment. We use sound to talk to each other, listen to music, watch movies, and even navigate our environment. Sound is also used in medical imaging, such as ultrasound, and in construction to detect flaws or defects in materials. Additionally, sound is used in many scientific and technological applications, such as sonar and seismology.
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