Physics
Grade-9
Easy
Question
For which of the following do the longitudinal waves exist?
- Vacuum
- Water
- Both (b) and (d)
- Air
Hint:
Longitudinal waves require medium to travel
The correct answer is: Both (b) and (d)
As longitudinal waves depend on motion of particles they require a medium
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Which of the following is carried by waves from one place to another?
- Mass
- Velocity
- Wavelength
- Energy
Which of the following is carried by waves from one place to another?
PhysicsGrade-9
- Mass
- Velocity
- Wavelength
- Energy
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Mechanical Waves cannot travel through:
- Air
- Water
- Steel
- Space
Mechanical Waves cannot travel through:
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- Air
- Water
- Steel
- Space
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Waves that travel perpendicular to the direction of vibrations are known as:
- Transverse wave
- Longitudinal wave
- Circular wave
- None of these
Waves that travel perpendicular to the direction of vibrations are known as:
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- Transverse wave
- Longitudinal wave
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Light waves are
- Longitudinal
- Transverse
- Partly longitudinal, partly transverse
- Sometimes longitudinal, sometimes transverse.
Light waves are
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- Longitudinal
- Transverse
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- Sometimes longitudinal, sometimes transverse.
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When a longitudinal wave travels through a medium, the particles of the medium show compression and Rarefaction. What happens when compression takes place in the medium?
- The Density of the medium decreases.
- The pressure of the medium decreases.
- The molecules of the medium come closer to each other.
- The Wavelength of the wave increases.
When a longitudinal wave travels through a medium, the particles of the medium show compression and Rarefaction. What happens when compression takes place in the medium?
PhysicsGrade-9
- The Density of the medium decreases.
- The pressure of the medium decreases.
- The molecules of the medium come closer to each other.
- The Wavelength of the wave increases.
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In which of the following media can non-mechanical waves travel?
- In a vacuum and in a medium
- In vacuum but not in a medium
- In a medium but not in a vacuum
- Neither in a medium nor a vacuum
In which of the following media can non-mechanical waves travel?
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- In a vacuum and in a medium
- In vacuum but not in a medium
- In a medium but not in a vacuum
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Longitudinal waves are those ___.
- In which the particles of the medium vibrate along the direction of motion of the wave.
- In which the particles of the medium vibrate perpendicular to the direction of motion of the wave.
- Which does not require a material medium for their propagation.
- None of the above
Longitudinal waves are those ___.
PhysicsGrade-9
- In which the particles of the medium vibrate along the direction of motion of the wave.
- In which the particles of the medium vibrate perpendicular to the direction of motion of the wave.
- Which does not require a material medium for their propagation.
- None of the above
Physics
In a medium, a mechanical wave travels. With the wave, which of the following quantities is moved from one point to another?
- Mass
- Speed
- Density
- Energy
In a medium, a mechanical wave travels. With the wave, which of the following quantities is moved from one point to another?
PhysicsGrade-9
- Mass
- Speed
- Density
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A longitudinal wave is produced by the vibration of an object. It travels through a medium such as air by forming alternate regions of compression and Rarefaction of air molecules. As a longitudinal wave travels through air, the regions of compression and Rarefaction in it can be shown as:
A longitudinal wave is produced by the vibration of an object. It travels through a medium such as air by forming alternate regions of compression and Rarefaction of air molecules. As a longitudinal wave travels through air, the regions of compression and Rarefaction in it can be shown as:
PhysicsGrade-9
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A pulse is a wave:
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- Of short duration
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- Which travels in solids only
A pulse is a wave:
PhysicsGrade-9
- Of high duration
- Of short duration
- Which travels in a vacuum only
- Which travels in solids only
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What are the two types of mechanical waves?
- Transverse and Longitudinal
- Transverse and Electromagnetic
- Electromagnetic and Longitudinal
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What are the two types of mechanical waves?
PhysicsGrade-9
- Transverse and Longitudinal
- Transverse and Electromagnetic
- Electromagnetic and Longitudinal
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Sound waves are:
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- Transverse
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Transverse waves have ________.
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- Trough
- Rarefaction
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Transverse waves have ________.
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- Crest
- Trough
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- Both a and b
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Choose the correct statements:
Assertion: Sine and cosine functions are periodic functions.
Reason: Sinusoidal functions repeat their values after a definite interval of time.
- Assertion is correct, the reason is correct; the reason is a correct explanation for assertion
- Assertion is correct, the reason is correct; the reason is not a correct explanation for assertion
- Assertion is correct, the reason is incorrect
- Assertion is incorrect, the reason is correct
Choose the correct statements:
Assertion: Sine and cosine functions are periodic functions.
Reason: Sinusoidal functions repeat their values after a definite interval of time.
PhysicsGrade-9
- Assertion is correct, the reason is correct; the reason is a correct explanation for assertion
- Assertion is correct, the reason is correct; the reason is not a correct explanation for assertion
- Assertion is correct, the reason is incorrect
- Assertion is incorrect, the reason is correct
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A 20 g particle moves in SHM with a frequency of 3 oscillations per second and an amplitude of 5 cm. The total distance does the particle move during one oscillation is:
- 10 cm
- 15 cm
- 20 cm
- 25 cm
A 20 g particle moves in SHM with a frequency of 3 oscillations per second and an amplitude of 5 cm. The total distance does the particle move during one oscillation is:
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- 10 cm
- 15 cm
- 20 cm
- 25 cm