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Quiz 22
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Q.1
To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor
Should be made of a good conductor but can be of any shape
Should be in the form of a vertical rod
Can be of any shape
Should be made of a good conductor like copper with sharp-pointed edges
Q.2
A person is hurt on kicking a stone due to
Inertia
Velocity
Reaction
Momentum
Q.3
Energy travels from Sun to Earth through
Conduction
Convection
Radiation
Modulation
Q.4
Which best describes how air moves during convection?
Cool air falls down
Warm air falls down
Cool air is replaced by warm air
Air always falls down
Q.5
Ventilators are provided near the ceiling of the room because
The exhaled warmer air rises up and goes out
These provide cross ventilation in the room
These provide some sunlight in the room
These do not look nice in the lower part
Q.6
Wollen clothes keep the body warm because
Wool increases the temperature of the body
Wool is a bad conductor
Wool absorbs radiant heat from outer objects
Wool rejects heat from the outer objects
Q.7
Heat from the Sun reaches the Earth by
Reflection
Conduction
Radiation
Convection
Q.8
Heat transfer by conduction occurs when molecules
Collide
Combine
Heated
None of the above
Q.9
The earth is a
Good reflector of heat
Non-absorber of heat
Good absorber and good radiator of heat
Bad absorber and bad radiator of heat
Q.10
When temperature difference between liquid and its surroundings is doubled, the rate of loss of heat will:
Remain same
Double
Three times
Four times
Q.11
Global warming is expected to result in
Increase in level of sea
Change in crop pattern
Change in coast line
All of the above
Q.12
Moment of inertia is:
Vector
Scalar
Phasor
Tensor
Q.13
Why two thin shirts can keep us warmer than a single thick shirt in winter ?
Two thin shirts become thicker so prevent transmission of heat
Air layer between two shirts works as good conductor
Air layer between two shirts behaves like insulating media
No radiation of heat takes place
Q.14
A white and smooth surface is
Good absorber and good reflector of heat
Bad absorber and good reflector of heat
Good absorber and bad reflector of heat
Bad absorber and bad reflector of heat
Q.15
The atmosphere is heated mainly by
Insolation
Conduction
Radiation
Convection
Q.16
Why does ice covered in sawdust not melt quickly ?
Sawdust does not allow the air to touch the ice
The water is absorbed by sawdust
Sawdust is a bad conductor of heat
Sawdust is good conductor of heat
Q.17
Ice is packed in saw dust because
Saw dust will not get melted easily.
Saw dust is poor conductor of heat.
Saw dust is a good conductor of heat.
Saw dust does not stick to the ice.
Q.18
When does land breeze occur?
Fall
Winter
Both A & B
Hot summer
Q.19
The cooling by a desert Cooler is based on:
Hot air replacement
Air dehydration
Evaporative Cooling
Air Rehydration
Q.20
Plants are dried up in winter due to frost because
Evaporation does not take place
Photosynthesis does not take place at such low temperature
Respiration does not take place at low temperature
There is mechanical loss of tissues and drought condition prevails
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?
Conduction and convection only
Conduction and radiation only
Convection and radiation only
Conduction, convection and radiation
Q.22
A body absorbs heat most if it is
Black and rough
Black and smooth
White and rough
White and smooth
Q.23
A black body can absorb radiations of :
Lower wavelengths only
Intermediate wavelengths only
Higher wavelengths only
All wavelengths
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.
Rough white
Rough black
Shining white
Shining black
Q.25
Which of the following criterion is used for any metal to be used as a cooking material ?
More specific heat
More thermal conductivity
Less thermal conductivity
Less electrical conductivity
Q.26
The word ''insolation' means
Matters which insulate
Incoming solar radiation
Insoluble matters
None of the above
Q.27
Tap water is placed in an open pad and allowed to evaporate. After some time the temperature of water
Increases to a great extent
Increases slightly
Decreases slightly
Decreases rapidly
Q.28
Sun's heat reaches us by
Conduction
Convection
Radiation
Reflection
Q.29
The direction of heat flow between two objects depends on
Their masses
Their heat contents
Their temperatures
Whether they are in solid, liquid or gaseous state
Q.30
Woollen cloth protects the body from cold because
It is a good conductor of heat
It is a poor conductor of heat
External heat rays enter into the body through the woollen cloth
It reflects heat
Q.31
In general, which is the cause of a sea breeze?
Pressure
Specific heat
Heat
All the above
Q.32
Outside of cooking utensils are generally left black from below because
It is difficult to clean daily.
Black surface is a good conductor of heat.
Black surface is a poor conductor of heat.
Black surface is a good absorber of heat.
Q.33
In general, which is the cause of a land breeze?
Pressure
Heat
Temperature
None of the above
Q.34
The cover of a solar cooker is made of glass because
It absorbs sun's rays
It reflects sun's rays
It retains the heat inside by the green house effect
It rediates heat better than metals
Q.35
Thermocouple consists of
Two dissimilar metals
Two similar metals
Metal and a semiconductor
Metal and an insulator
Q.36
Water has maximum density at
100°C
0°C
4°C
273°C
Q.37
Heat from the sun reaches earth by the process of
Conduction
Convection
Radiation
All of the above
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.
Rough white
Rough black
Shining white
Shining black
Q.39
Heat transfer by radiation mainly depends upon
Kind and extent of its surface
Its temperature
Nature of the body
All of the above
Q.40
When water freezes its density
Decreases
Becomes Zero
Remains constant
Increases
Q.41
What type of heat transfer is boiling water?
Radiation
Conduction
Convection
None of the above
Q.42
Which of the following are methods of heat transfer?
Convection
Evaporation
Revolution
Thermal Expansion
Q.43
Heat energy is transferred by conduction whenever molecules
Collide each other
Means of photons
Particles replaces there places
All of the above
Q.44
Of the following natural phenomena, tell which one known in Sanskrit as 'deer's thirst'?
Rainbow
Earthshine
Halo
Mirage
Q.45
In which of the following industries is mica as a raw material?
Cement
Glass and Pottery
Iron and Steel
Electrical
Q.46
Radiocarbon dating technique is used to estimate the age of
rocks
monuments
soil
fossils
Q.47
ML
2
T
-2
is the dimensional formula for
moment of inertia
pressure
elasticity
couple acting on a body
Q.48
Solar eclipse will take place when
the sun is between the moon and the earth
the earth is between the moon and the sun
the moon is between the sun and the earth
the moon does not lie on the line joining the sun and the earth
Q.49
On a cold day when a room temperature is 15
o
C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15
o
C, because
metals have higher thermal capacity than plastics
plastics have a lower density than metals
metals are good conductor of heat
plastics have a higher thermal conductivity than metals
Q.50
Supersonic plane fly with the speed
less than the speed of sound
of sound
greater than the speed of sound
of light
0 h : 0 m : 1 s
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