-
question_answer1)
Which of the following conditions enables heat to flow from one body to another identical body?
A)
The difference in the temperatures of the two bodies done
clear
B)
The difference in the pressures exerted on the two bodies done
clear
C)
The difference in the densities of the two bodies done
clear
D)
The difference in the sizes of the two bodies done
clear
View Solution play_arrow
-
question_answer2)
When you heat water in a pot, it boils. What can you infer from the above observation?
A)
Heat is a form of energy. done
clear
B)
Water can boil by itself. done
clear
C)
Water develops heat on its own. done
clear
D)
Water is a universal solvent. done
clear
View Solution play_arrow
-
question_answer3)
What must be done to enable mercury in a glass thermometer to respond quickly to changes in temperature?
A)
The bore should be narrow. done
clear
B)
The wall of stem should be thin. done
clear
C)
The bulb should contain a lot of mercury. done
clear
D)
The wall of glass bulb should be thin. done
clear
View Solution play_arrow
-
question_answer4)
Why do cooking vessels usually have copper bottoms?
A)
Copper has low melting point. done
clear
B)
Copper is an insulator of heat. done
clear
C)
Copper is a good conductor of heat. done
clear
D)
Copper is cheap. done
clear
View Solution play_arrow
-
question_answer5)
For the effective radiation of heat by an electric room heater, which of the following needs to be done?
A)
Keep it clean. done
clear
B)
Polish it to shine. done
clear
C)
Paint it green. done
clear
D)
Paint it black. done
clear
View Solution play_arrow
-
question_answer6)
What is the measure of the degree of hotness or coldness of a body called?
A)
Heat energy done
clear
B)
Celsius done
clear
C)
Kelvin done
clear
D)
Temperature done
clear
View Solution play_arrow
-
question_answer7)
Why are two thin blankets piled together warmer than a single one of the same total thickness as the two?
A)
Air is enclosed in between them. done
clear
B)
The outer thin blanket transfers heat faster. done
clear
C)
Air acts as medium to transfer the energy. done
clear
D)
There is a decrease in the sensation of touch. done
clear
View Solution play_arrow
-
question_answer8)
Conduction of heat does not take place in
A)
copper. done
clear
B)
iron. done
clear
C)
aluminium. done
clear
D)
vacuum. done
clear
View Solution play_arrow
-
question_answer9)
Why are asbestos sheets used for laying the roofs of some houses?
A)
They are good conductors of heat. done
clear
B)
They are bad conductors of heat. done
clear
C)
They are costly. done
clear
D)
They have nice look. done
clear
View Solution play_arrow
-
question_answer10)
Why is mercury widely used in clinical thermometers?
(i) Mercury is easily available in pure form. |
(ii) Mercury is opaque. |
(iii) Mercury has a constant coefficient of expansion. |
A)
Only (i) and (ii) done
clear
B)
Only (ii) and (iii) done
clear
C)
Only (i) and (iii) done
clear
D)
(i), (ii) and (iii) done
clear
View Solution play_arrow
-
question_answer11)
Why is it hotter over the top of a fire than at the same distance on the sides?
A)
Due to convection of heat done
clear
B)
Due to conduction of heat done
clear
C)
Due to radiation of heat done
clear
D)
Due to conduction, convection and radiation of heat done
clear
View Solution play_arrow
-
question_answer12)
Which of the following is NOT a scale of temperature?
A)
Kelvin scale done
clear
B)
Celsius scale done
clear
C)
Fahrenheit scale done
clear
D)
Richter scale done
clear
View Solution play_arrow
-
question_answer13)
How many parts does a Celsius scale have?
A)
100 done
clear
B)
273 done
clear
C)
180 done
clear
D)
50 done
clear
View Solution play_arrow
-
question_answer14)
What is the range of a clinical thermometer?
A)
\[0-100{{\,}^{o}}C\] done
clear
B)
\[32-214{{\,}^{o}}F\] done
clear
C)
\[0-273\text{ }{{\,}^{o}}C\] done
clear
D)
\[35-42\text{ }{{\,}^{o}}C\] done
clear
View Solution play_arrow
-
question_answer15)
Identify the normal human body temperature.
A)
\[32{{\,}^{o}}F\] done
clear
B)
\[212{{\,}^{o}}F\] done
clear
C)
\[100.4{{\,}^{o}}F\] done
clear
D)
\[~98.4{{\,}^{o}}F\] done
clear
View Solution play_arrow
-
question_answer16)
X is the mode of transmission of heat that takes place by the movement of hot particles. Identify X.
A)
Conduction done
clear
B)
Convection done
clear
C)
Radiation done
clear
D)
Expansion done
clear
View Solution play_arrow
-
question_answer17)
By which mode of transmission of heat does air get heated up?
A)
Conduction done
clear
B)
Convection done
clear
C)
Radiation done
clear
D)
Diffusion done
clear
View Solution play_arrow
-
question_answer18)
In cold countries, why are steam pipes covered with asbestos or glass wool?
A)
To prevent bursting due to expansion done
clear
B)
To prevent heat loss due to conduction done
clear
C)
To prevent radiation done
clear
D)
All of the above done
clear
View Solution play_arrow
-
question_answer19)
Windows having double glass panes with some space between them is called double glazing. Why do windows in cold countries have double glazing?
A)
For the conduction of heat done
clear
B)
For the insulation of heat done
clear
C)
For the radiation of heat done
clear
D)
All of the above done
clear
View Solution play_arrow
-
question_answer20)
Which of these phenomena is caused due to convection?
A)
Ventilation done
clear
B)
Trade winds done
clear
C)
Ocean currents done
clear
D)
All of the above done
clear
View Solution play_arrow
-
question_answer21)
Which of the following is a good conductor of heat?
A)
Plastic done
clear
B)
Water done
clear
C)
Glass done
clear
D)
Copper done
clear
View Solution play_arrow
-
question_answer22)
What is the mode by which heat is transferred in solid substances?
A)
Conduction done
clear
B)
Convection done
clear
C)
Radiation done
clear
D)
Insulation done
clear
View Solution play_arrow
-
question_answer23)
Which of the following is a bad conductor of heat?
A)
Wood done
clear
B)
Aluminium done
clear
C)
Iron done
clear
D)
Bronze done
clear
View Solution play_arrow
-
question_answer24)
When two objects are in thermal contact, how is the heat from one body to the other body transferred?
A)
Conduction done
clear
B)
Convection done
clear
C)
Radiation done
clear
D)
Insulation done
clear
View Solution play_arrow
-
question_answer25)
How is heat conducted in solids?
A)
From a high pressure to a low pressure region done
clear
B)
From a colder to a hotter region done
clear
C)
From a hotter to a colder region done
clear
D)
From a low pressure to a high pressure region done
clear
View Solution play_arrow
-
question_answer26)
Which is the best conductor of heat?
A)
Silver done
clear
B)
Iron done
clear
C)
Aluminium done
clear
D)
Copper done
clear
View Solution play_arrow
-
question_answer27)
Why are tea cups never made of metals?
A)
Metals are good conductors of heat. done
clear
B)
Metals are lustrous. done
clear
C)
Metals are expensive. done
clear
D)
Metals have high melting point. done
clear
View Solution play_arrow
-
question_answer28)
In which of the following is the rate of heat transfer more?
A)
Glass done
clear
B)
Copper done
clear
C)
Plastic done
clear
D)
Wood done
clear
View Solution play_arrow
-
question_answer29)
Rooms are fitted with ventilators to let hot air out. What is the phenomenon involved in the above?
A)
Conduction done
clear
B)
Convection done
clear
C)
Radiation done
clear
D)
Condensation done
clear
View Solution play_arrow
-
question_answer30)
What enables birds to glide effortlessly in the air?
A)
Conduction of heat in the air done
clear
B)
Radiation through the atmosphere done
clear
C)
Convection currents of air done
clear
D)
More sugar in their body cells done
clear
View Solution play_arrow
-
question_answer31)
When we touch a steel rod and a sheet of paper simultaneously, why do we feel that the steel rod is colder than the sheet of paper?
A)
Steel, being a good conductor, absorbs heat from our body. done
clear
B)
Paper being a good conductor, absorbs more heat from our body. done
clear
C)
Heat flows from steel to our body. done
clear
D)
Heat flows from the paper to our body. done
clear
View Solution play_arrow
-
question_answer32)
What is the energy conversion taking place in an electric heater?
A)
Chemical energy is converted to electrical energy. done
clear
B)
Electrical energy is converted to chemical energy. done
clear
C)
Heat energy is converted to electrical energy. done
clear
D)
Electrical energy is converted to heat energy. done
clear
View Solution play_arrow
-
question_answer33)
Which of the following statements is true about convection?
A)
In solids, heat is transferred only by convection. done
clear
B)
Convection occurs in cold liquids. done
clear
C)
Convection requires a medium for transmission. done
clear
D)
Heat flows from the cold end to the hot end in a substance. done
clear
View Solution play_arrow
-
question_answer34)
Riaz needs a box which can absorb the heat from the sun very fast but lose it very slowly. How should the outer and the inner surface of the box be colored so that he gets the best result?
A)
Outer-Silver/Inner-Silver done
clear
B)
Outer-Black/Inner-Black done
clear
C)
Outer - Silver, Inner ? Black done
clear
D)
Outer - Black, Inner ? Silver done
clear
View Solution play_arrow
-
question_answer35)
Which part of a thermos flask prevents loss of heat through radiation?
A)
Vacuum done
clear
B)
Cork stopper done
clear
C)
Double glass walls done
clear
D)
Shiny/silvery wall done
clear
View Solution play_arrow
-
question_answer36)
A What happens when the temperature of a substance is increased?
A)
Kinetic energy of the molecules of the substance increases. done
clear
B)
Kinetic energy of the molecules of the substance decreases. done
clear
C)
The amplitude of vibrations of molecules of the substance about their mean position decreases. done
clear
D)
It does not cause any change. done
clear
View Solution play_arrow
-
question_answer37)
What is temperature?
A)
The rate of expansion of an object done
clear
B)
The loss of heat energy done
clear
C)
The volume of a gas occupied done
clear
D)
The degree of hotness or coldness of a body done
clear
View Solution play_arrow
-
question_answer38)
Why do solar panels have black surfaces?
A)
Because they are good absorbers of heat done
clear
B)
Because they are bad absorbers of heat done
clear
C)
Because they are good reflectors of heat done
clear
D)
Because they are bad radiators of heat done
clear
View Solution play_arrow
-
question_answer39)
There are four cups made of different materials: Silver, aluminium, wood and copper. In which of them will tea remain warm for a longer time?
A)
Silver cup done
clear
B)
Aluminium cup done
clear
C)
Wooden cup done
clear
D)
Copper cup done
clear
View Solution play_arrow
-
question_answer40)
The base of a cooking vessel is usually black and dull. Why is it made this way?
A)
Black is a favorite color of most of the consumers. done
clear
B)
Dull surface prevent slipping of vessels. done
clear
C)
Black and dull surfaces are good absorbers of heat. done
clear
D)
Black and dull surfaces are good reflectors of heat. done
clear
View Solution play_arrow