Q.1
To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor
Q.2
A person is hurt on kicking a stone due to
Q.3
Energy travels from Sun to Earth through
Q.4
Which best describes how air moves during convection?
Q.5
Ventilators are provided near the ceiling of the room because
Q.6
Wollen clothes keep the body warm because
Q.7
Heat from the Sun reaches the Earth by
Q.8
Heat transfer by conduction occurs when molecules
Q.9
The earth is a
Q.10
When temperature difference between liquid and its surroundings is doubled, the rate of loss of heat will:
Q.11
Global warming is expected to result in
Q.12
Moment of inertia is:
Q.13
Why two thin shirts can keep us warmer than a single thick shirt in winter ?
Q.14
A white and smooth surface is
Q.15
The atmosphere is heated mainly by
Q.16
Why does ice covered in sawdust not melt quickly ?
Q.17
Ice is packed in saw dust because
Q.18
When does land breeze occur?
Q.19
The cooling by a desert Cooler is based on:
Q.20
Plants are dried up in winter due to frost because
Q.21
A cup of hot coffee is placed on a metal table in a room. By which of the following methods does it lose heat?
Q.22
A body absorbs heat most if it is
Q.23
A black body can absorb radiations of :
Q.24
Hot water is poured simultaneously in four metallic tumblers painted outside with different points. After some time the water will be found to have cooled most in the tumbler painted.
Q.25
Which of the following criterion is used for any metal to be used as a cooking material ?
Q.26
The word ''insolation' means
Q.27
Tap water is placed in an open pad and allowed to evaporate. After some time the temperature of water
Q.28
Sun's heat reaches us by
Q.29
The direction of heat flow between two objects depends on
Q.30
Woollen cloth protects the body from cold because
Q.31
In general, which is the cause of a sea breeze?
Q.32
Outside of cooking utensils are generally left black from below because
Q.33
In general, which is the cause of a land breeze?
Q.34
The cover of a solar cooker is made of glass because
Q.35
Thermocouple consists of
Q.36
Water has maximum density at
Q.37
Heat from the sun reaches earth by the process of
Q.38
Hot water is poured simultaneously in four metallic tumblers painted outside with different paints. After some time the water will be found to have cooled most in the tumbler painted.
Q.39
Heat transfer by radiation mainly depends upon
Q.40
When water freezes its density
Q.41
What type of heat transfer is boiling water?
Q.42
Which of the following are methods of heat transfer?
Q.43
Heat energy is transferred by conduction whenever molecules
Q.44
Of the following natural phenomena, tell which one known in Sanskrit as 'deer's thirst'?
Q.45
In which of the following industries is mica as a raw material?
Q.46
Radiocarbon dating technique is used to estimate the age of
Q.47
ML2T-2 is the dimensional formula for
Q.48
Solar eclipse will take place when
Q.49
On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because
Q.50
Supersonic plane fly with the speed
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