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Q.1
On which principle does the hydraulic lift works?
Newton's law
Pascal's law
Archimedes's law
Joule's law
Q.2
Echo is heard due to
Refraction
Scattering
Reflection
Interference
Q.3
Why does'nt the hydrogen atom emit X-rays?
It is very small in size
It has only one electron
Its energy levels are very close to each other
It is highly electropositive
Q.4
Speed of sound in air is unaffected by change in
Pressure
Humidity
Temperature
Volume
Q.5
Echolocation is an adaptation bats use to
Locate flowering plants
Hunt insects in flight
Find warm places for hibernation
All of the above
Q.6
Bats can sense obstacles because they produce
Supersonic sound waves
Ultrasonic sound waves
Infrasonic sound waves
Micro sound waves
Q.7
RADAR is used for
Detecting and locating the position of objects such as Aeroplanes
Locating submerged submarines
Locating geostationary satellites
Receiving a signals in a radio receiver
Q.8
What is the minimum distance (in metres) required to hear an echo?
10
13
17
21
Q.9
Which phenomenon is responsible for the echo of sound wave?
Reflection
Refraction
Interference
Polarisation
Q.10
Loudness of sound depends on
Frequency
Wavelength
Amplitude
Pitch
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
Audible wave
Infrasonic wave
Ultrasonic wave
Microwave
Q.12
Which term is not associated with sound wave?
Hertz
Decibel
Candela
Mach
Q.13
Sound travels fastest in
Vacuum
Air
Glass
Water
Q.14
Which among the following determines the pitch of a sound?
Amplitude
Frequency
Loudness
Wavelength
Q.15
Which one of the following animals can hear ultrasonic sound ?
Rat
Squirrel
Cat
Bat
Q.16
The instrument which uses sound waves to measure the depth of oceans is
Radar
Sonar
Altimeter
Venturimeter
Q.17
Velocity of sound in air does not depend on
Density of air
Temperature of air
Pressure of air
Humidity of air
Q.18
Megahertz is a measurement of
Frequency
Speed
Wavelength
Capacity
Q.19
The velocity of sound is more in
Water
Air
Steel
Wood
Q.20
Why is it difficult to breathe at higher altitudes?
Due to low air pressure
Due to low temperature
Due to ozone
Due to high humidity
Q.21
The Hydraulic Break works on the principle of ________ .
Pascal's Law
Boyle's law
Coulomb's law
Bernouli's law
Q.22
Propagation of sound can be visualised as propagation of ________ variations in the medium
Elasticity
Viscosity
Density
Porosity
Q.23
The velocity of sound in moist air is more than in dry air because the moist air has
Less density than dry air.
Less pressure than dry air.
More pressure than dry air.
More density than dry air.
Q.24
Reading of a barometer going down is an indication of
Storm
Rainfall
Snow
Intense heat
Q.25
The hydraulic brakes used in automobiles is a direct application of :
Archimedes' principle
Toricellian law
Bernoulli's theorem
Pascal's law
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
Height of the liquid column
Surface area of the bottom of the vessel
Density of the liquid
Acceleration due to gravity at the bottom of the vessel
Q.27
A person standing on a railway platform listens to the whistles of arriving and departing trains. The whistle heard is
The same in both cases in all respects
Of higher intensity when train arrives
Of higher pitch when train arrives
Of higher pitch when train departs
Q.28
Hydraulic brakes work on the principle of
Thomson's law
Newton's law
Bernoulli's theorem
Pascal's law
Q.29
What principle/law explains the working of the hydraulic brakes in automobiles ?
Bernoulli's law
Posieulle's principle
Pascal's law
Archimedes' principle
Q.30
Permissible noise level at Residential area during night time is :
45 dB (A)
55 dB (A)
75 dB (A)
80 dB (A)
Q.31
Calculate the time period (in seconds) of a sound wave of wavelength 4m traveling with a speed of 500m/s
2000
0.016
1000
0.008
Q.32
Which waves cannot be transmitted through vacuum?
Electromagnetic
Light
Sound
Heat
Q.33
Which one among the following doesn't have any effect on velocity of sound ?
Pressure
Temperature
Humidity
Density
Q.34
Velocity of sound in air does not change with the change of
Temperature of air
Pressure of air
Moisture content in air
Wind in the direction of propagation of sound
Q.35
Increased wind speed is accompanied by a reduced air ________
Humidity
Pressure
Density
Aridity
Q.36
A vacuum cleaner works on the principle of pressure difference. On the moon it will
Work as efficiently as on the earth
Not work at all
Work with reduced efficiency
Work with increased efficiency
Q.37
For which of the following game, players must have the knowledge of Pascal's law?
Climbing
Paragliding
Rafting
Scuba diving
Q.38
Air pressure is usually highest when the air is
Warm and moist
Cool and dry
Warm and dry
Cool and moist
Q.39
The sound produced by a bat is–
Audible
Subsonic
Infrasonic
Ultrasonic
Q.40
Sound is heard over longer distances on rainy days because
Sound travels slowly in moist air
Sound travels faster in moist air
Moist air does not absorb sound
Moist air absorbs sound
Q.41
Air moves from the region where the air ________
Humidity is high to the region where the humidity is low
Pressure is low to the region where the pressure is high
Pressure is high to the region where the pressure is low
Humidity is low to the region where the humidity is high
Q.42
Why do birds not have respiratory trouble at the time of flying at high altitude ?
Their lungs are very large
They fly inactively
They have extra air sacs
They use less oxygen
Q.43
The sudden fall of atmospheric pressure indicates
Fair weather
Storm
Rain
Cold weather
Q.44
Hydraulic brakes in automobile work on
Poiseuille's principle
Pascal's principle
Archimedes' principle
Bernoulli's principle
Q.45
Submerged objects can be located using
Radar
Sonar
Quasar
Pulsar
Q.46
If a barometric reading is falling, this usually indicates what
Increasing pressure
Decreasing pressure
No pressure
None
Q.47
The propagation of sound waves in a gas involves
Adiabatic compression and rarefaction
Isothermal compression and rarefaction
Isochoric compression and rarefaction
Isobaric compression and rarefaction
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
Doppler effect
Beats
Resonance
Echo
Q.49
Middle latitude cyclones are fueled by?
Air high in the atmosphere
Polar continental air masses
Energy from falling precipitation
All of the above
Q.50
Skating on ice is possible because
The surface of ice is smooth
Ice is cold
The pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water
The pressure on the ice due to skate raises its melting point
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