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Q 1. If the speed of an object moving along a straight line keeps changing, its motion is said to be
uniform
non-uniform
circular
None of these
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Q 2. Which of the following relations is correct? distance
speed=distance x time
speed = distance {tex} \div {/tex} time
speed = distance = time
None of these
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Q 3. The basic unit of time is
an hour
a minute
a second
None of these
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Q 4. The symbol of kilometre is
kilo
km
kilo m
None of these
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Q 5. The symbols of all units are written in
plural
singular
both singular and plural
None of these
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Q 6. A speedometre records the speed directly in
m/s
km/s
km/h
m/min
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Q 7. A device that measures the distance by the vehicle is known as
a speedometre
an odometer
a barometer
None of these
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Q 8. Fig shows the distance-time graph for the motion of two vehicles A and B Which one of them is moving faster? {tex}
{/tex}
A
B
Both A and B are moving with same speed
None of these
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Q 9. In humans, sound is produced by
Oesophagus
Mouth
Larynx
Lungs
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Q 10. Sound is produced due to
Rotation
Gravitation
Vibration
Reflection
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Q 11. The sound can not travel through
Air
Water
Vacuum
Oil
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Q 12. The to & fro motion of an object is known as ______motion
Rotatory
Circular
Linear
Oscillatory
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Q 13. If T is the time period & F is the frequency then
T=1{tex} \div {/tex} F
F = T{tex}^2{/tex}
F = T
T = F{tex}^2{/tex}
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Q 14. Unit of frequency is
m/s
m/s2
Kg/m3
hertz
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Q 15. If a body completes 50 oscillations in 1 second, its frequency will be
2500 Hz
50 Hz
1/50 Hz
None
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Q 16. The range of audible frequencies for normal human ear
20 Hz to 2000 Hz
2 Hz to 20000 Hz
20 Hz to 20000 Hz
2 Hz to 2000 Hz
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Q 17. The speed of a wave in a certain medium is 960 m/s. If 3600 waves pass over certain point of the medium in 1 minute then the wavelength of wave is
2 metres
4 metres
8 metres
16 metres
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Q 18. The equation of a progressive wave is Y = a sin (200 t - x) where x and y in metre and t in second. The velocity of wave is:
200 m/sec
100 m/sec
50 m/sec
None of these
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Q 19. Sound waves in air are:
Transverse
Longitudinal
De-Broglie waves
All of these
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Q 20. Sound waves of frequency greater than that of audible sound are called:
Sonic sound
Seismic waves
Infrasonic waves
Ultrasonic waves
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Q 21. Velocity of sound in a gas is 360 msFT{tex}^{-1}{/tex} and the distance between a compression and the nearest rarefraction is 1m. Then the frequency of sound (CPS):
90
720
180
360
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Q 22. In wave motion:
Particles of the medium travel from one place to other.
Particles of the medium vibrate about their mean position.
Particles of the medium do not vibrate.
All are true
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Q 23. Sound waves are:
Longitudinal
Transverse
None of these
Both longitudinal and transverse
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Q 24. The audible frequency range is:
20 Hz to 2000 Hz
10 Hz to 20 Hz
20 Hz to 20,000 Hz
20 Hz to 100 Hz
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Q 25. Assertion: Sound propagates through air from one place to another.Reason: Air particles carry the sound waves from one place to another.
Both Assertion and Reason are true and Reason is the correct explanation of 'Assertion'
Both Assertion and Reason are true and Reason is not the correct explanation of 'Assertion'
Assertion is true but Reason is false
Assertion is false but Reason is true