Q.1
Which process allows water to enter the atmosphere?
Q.2
When a barometer reading suddenly recedes, it indicates that climate–
Q.3
When a barometer is rising air pressure is
Q.4
When the barometer reading dips suddenly, it is an indication of
Q.5
A storm is predicted if atmospheric pressure
Q.6
Hydraulic machines work under the Principle of :
Q.7
Alcohol is more volatile than water because ________ is lower than water.
Q.8
Anemometer is an instrument meant for measuring ________
Q.9
A fountain pen works on the principle of
Q.10
The atmospheric air is held to the Earth by :
Q.11
The pressure exerted by a 760 mm column of mercury at 0°C is known as
Q.12
A manometer is used to measure
Q.13
Anemometer is used to measure
Q.14
A barometer is kept inside a bell jar. Air is slowly pumped out of the jar.
Q.15
The temperature at which water boils depends mainly on
Q.16
The pressure of a fluid varies with depth h as P = PQ+pgh, where p is the fluid density. This expression is associated with
Q.17
A parachute descends slowly whereas a stone dropped from the same height falls rapidly, because
Q.18
The instrument used to measure the speed of the wind is
Q.19
Air pressure is measured in which of the following units?
Q.20
Why does bleeding occur through the nose in high mountainous regions ?
Q.21
Which of the following instruments is used to measure humidity ?
Q.22
Which of these is true of all simple machines?
Q.23
What is the resistance (in ohm) of an electrical component if a current of 0.1 A passes through it on application of 5 V of potential difference across it?
Q.24
Which one of the following is used for sun glasses ?
Q.25
Radioactive elements can be traced out in living cell through a technique called
Q.26
The radiant energy having lowest energy is
Q.27
The modulus of elasticity for mild steel is approximately equal to
Q.28
The Hooke's law is valid for
Q.29
Instrument for measuring blueness of the sky or ocean is called ________
Q.30
Photosynthesis takes place faster in
Q.31
The mercury and sodium street lamps light up because of :
Q.32
Nuclear Reactors are based on which of the following phenomenon?
Q.33
Gas thermometers are more sensitive than the liquid thermometers because the gases
Q.34
What happens to a liquid, when the vapour pressure equals the atmospheric pressure?
Q.35
Which is a correct way to measure wavelength?
Q.36
The centre of gravity of a sprinter during the race lies
Q.37
Who enunciated the laws of planetary motion?
Q.38
In a bipolar junction transistor
Q.39
Addition of suitable impurities into semiconductor, is called
Q.40
The Capacity of a communication channel is measured in
Q.41
The frequency used in TV and radar system lies in
Q.42
The sharpness of a television image is termed as its
Q.43
Which of the following is the fastest communication channel?
Q.44
Which type of radiation has the lowest penetrating ability?
Q.45
An oil drop spreads over water because
Q.46
If the temperature of a place increases suddenly, the relative humidity
Q.47
If the phase difference between two points is 120° for a wave with velocity of 360 m/s and frequency 500 Hz, then path difference between the two points is
Q.48
Why are we able to hear short wave broadcasts better than long wave broadcasts ?
Q.49
The frequency of ultrasound wave is typically
Q.50
The tidal waves on sea is mainly due to
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