Q481
Open questionEcholocation is an adaptation bats use to
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Q482
Open questionBats can sense obstacles because they produce
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Q483
Open questionA wavelength of 0.3 m is produced in air and it travels at a speed of 300 m/s. Then it will be an
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Q484
Open questionWhich term is not associated with sound wave?
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Q485
Open questionVelocity of sound in air does not depend on
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Q486
Open questionSpeed of sound in air is unaffected by change in
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Q487
Open questionRADAR is used for
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Q488
Open questionWhat is the minimum distance (in metres) required to hear an echo?
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Q489
Open questionSound travels fastest in
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Q490
Open questionWhich among the following determines the pitch of a sound?
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Q491
Open questionThe bats can fly in the dark because
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Q492
Open questionThe device used for locating submerged objects under sea is.
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Q493
Open questionThe sounds having a frequency of 20 Hertz to 20,000 Hertz are known as
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Q494
Open questionIn mirrors the back surface is coated with a thin layer of :
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Q495
Open questionA light ray travelling from denser to rarer medium at an angle of incidence more than critical angle of concerned media pair suffers.
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Q496
Open questionThe snow on the mountains does not melt all at once when it is heated by the sun because:
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Q497
Open questionCloudy nights are warmer compared to clear cloudless nights, because clouds mainly
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Q498
Open questionIn which one of the following the phenomenon of total internal reflection of light is used ?
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Q499
Open questionWhich type of mirror is used in the head lights of vehicles ?
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Q500
Open questionIf objects appear enlarged and inverted in a rear view mirror, then which type of mirror is used?
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