Q.1
Decibel is a term connected with :
Q.2
Decibel is the unit used for
Q.3
In SONAR which kind of wave is used?
Q.4
Sound waves cannot travel through
Q.5
Which determines the frequency of a sound wave?
Q.6
Which is best used as a sound absorbing material in partition walls ?
Q.7
Speed of sound is the greatest in :
Q.8
The unit of noise pollution (level) is :
Q.9
The speed of sound travel fastest through
Q.10
The number of waves per second in a sound is called ________ of that sound.
Q.11
Sound waves do not show the phenomenon of
Q.12
Sound becomes hazardous noise pollution at decibels?
Q.13
The speed of sound in air depends on
Q.14
An object at rest may have
Q.15
The pitch of sound depends on its
Q.16
What apparatus is used to locate a submerged object?
Q.17
Compressions and Rarefactions are characteristic of
Q.18
Least audible sound for most of the human ear is :
Q.19
Speed of sound is maximum in which among the following?
Q.20
The ringing of an electric bell in an enclosed evacuated glass bell jar is not heard outside because
Q.21
Which conservation principle is applicable in the case of the motion of a rocket?
Q.22
Rocket works on the principle of
Q.23
When a card placed over a tumbler is flicked with the finger, the coin placed over it falls in the tumbler.
Q.24
According to the Second Law of Motion, for a given force, acceleration is inversely proportional to the ________ of an object.
Q.25
Lightning heats the surrounding air to
Q.26
Which of the following is not an intrusive igneous body?
Q.27
A decibel is
Q.28
Hertz is a unit for measuring
Q.29
What is the full form of "RADAR" ?
Q.30
A man stands in a lift which accelerates upwards. The resultant reaction force on the floor of the lift is
Q.31
Who defined the law of gravitation ?
Q.32
When a bullet is fired from a gun
Q.33
The inability of a body to change its state of rest or uniform motion along a straight line is called its
Q.34
A passenger standing in a bus is thrown outward when the bus takes a sudden turn. This happens due to
Q.35
When a running car stops suddenly, the passengers tends to lean forward because of:
Q.36
Why does a cannon recoil after firing ?
Q.37
When a constant force acts on an object with a mass of 8 kg for a duration of 3 s. it increases the object's velocity from 4 m/s to 6 m/s . What is the magnitude of the applied force?
Q.38
The instrument for measuring intensity of earthquakes is called
Q.39
An instrument that records earthquakes is
Q.40
It is difficult to fix a nail on a freely suspended wooden frame. Which law supports this statement?
Q.41
One watt-hour is equivalent to
Q.42
In the Earth, the weight of a body is maximum at the
Q.43
The moment of inertia of a body does not depend upon its
Q.44
An athlete runs before long jump to get advantage on
Q.45
What is the gravity of moon as compared to the Earth
Q.46
Heat is transmitted from higher temperature to lower temperature through the actual motion of the molecules in
Q.47
When a ring of metal is heated what happens to its hole ?
Q.48
The base of an electric iron is brightly polished mainly
Q.49
A stone floor feels cold to the bare feet but a carpet on the same floor feels warm. This is because
Q.50
A body of mass 5 kg accelerates from 12 m/s to 20 m/s in 4 seconds due to the application of a force on it. Calculate the magnitude of this force (in N).
0 h : 0 m : 1 s