Q.1
On which principle does the hydraulic lift works?
Q.2
Echo is heard due to
Q.3
Why does'nt the hydrogen atom emit X-rays?
Q.4
Speed of sound in air is unaffected by change in
Q.5
Echolocation is an adaptation bats use to
Q.6
Bats can sense obstacles because they produce
Q.7
RADAR is used for
Q.8
What is the minimum distance (in metres) required to hear an echo?
Q.9
Which phenomenon is responsible for the echo of sound wave?
Q.10
Loudness of sound depends on
Q.11
A wavelength of 0.3 m is produced in air and it travels at a speed of 300 m/s. Then it will be an
Q.12
Which term is not associated with sound wave?
Q.13
Sound travels fastest in
Q.14
Which among the following determines the pitch of a sound?
Q.15
Which one of the following animals can hear ultrasonic sound ?
Q.16
The instrument which uses sound waves to measure the depth of oceans is
Q.17
Velocity of sound in air does not depend on
Q.18
Megahertz is a measurement of
Q.19
The velocity of sound is more in
Q.20
Why is it difficult to breathe at higher altitudes?
Q.21
The Hydraulic Break works on the principle of ________ .
Q.22
Propagation of sound can be visualised as propagation of ________ variations in the medium
Q.23
The velocity of sound in moist air is more than in dry air because the moist air has
Q.24
Reading of a barometer going down is an indication of
Q.25
The hydraulic brakes used in automobiles is a direct application of :
Q.26
If we want to calculate the pressure of a liquid at the bottom of a vessel, the quantity which is not required to determine it, is
Q.27
A person standing on a railway platform listens to the whistles of arriving and departing trains. The whistle heard is
Q.28
Hydraulic brakes work on the principle of
Q.29
What principle/law explains the working of the hydraulic brakes in automobiles ?
Q.30
Permissible noise level at Residential area during night time is :
Q.31
Calculate the time period (in seconds) of a sound wave of wavelength 4m traveling with a speed of 500m/s
Q.32
Which waves cannot be transmitted through vacuum?
Q.33
Which one among the following doesn't have any effect on velocity of sound ?
Q.34
Velocity of sound in air does not change with the change of
Q.35
Increased wind speed is accompanied by a reduced air ________
Q.36
A vacuum cleaner works on the principle of pressure difference. On the moon it will
Q.37
For which of the following game, players must have the knowledge of Pascal's law?
Q.38
Air pressure is usually highest when the air is
Q.39
The sound produced by a bat is–
Q.40
Sound is heard over longer distances on rainy days because
Q.41
Air moves from the region where the air ________
Q.42
Why do birds not have respiratory trouble at the time of flying at high altitude ?
Q.43
The sudden fall of atmospheric pressure indicates
Q.44
Hydraulic brakes in automobile work on
Q.45
Submerged objects can be located using
Q.46
If a barometric reading is falling, this usually indicates what
Q.47
The propagation of sound waves in a gas involves
Q.48
When two similar sources vibrate with slightly different frequencies, a regular rise and fall occurs in the loudness of tone. This phenomenon is known as
Q.49
Middle latitude cyclones are fueled by?
Q.50
Skating on ice is possible because
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