Water equivalent is equal to the product of

Latent heat and volume of water

While measuring the thermal conductivity of a liquid, we keep the upper part hot and the lower part cool because

Radiation gets stopped in this way

Heat conduction is easier downwards

Convection gets stopped in this way

Radiation gets stopped in this way

It is easier and more convenient to do so

The critical temperature of a gas is the temperature

Below which the gas cannot be liquefied

At which Boyle's law is strictly obeyed

At which the gas liquefies at a pressure of one atmosphere

Above which the gas cannot be liquefied

Below which the gas cannot be liquefied

Heat capacity of substance is infinite. It means

No change in temperature whether heat is taken in or give out

The unit of temperature adopted by the SI (international system of units) is the celsius and kelvin scales. It is based on the

Temperature at which solid, liquid and gaseous water are all in equilibrium, i.e., -273 C

Triple point of water corresponding to -0.01 C

Temperature at which solid, liquid and gaseous water are all in equilibrium, i.e., -273 C

Which one of the following statements is correct. Transfer of heat energy from a heater coil to the cooking vessel takes place through the process of

Convection, conduction and radiation

Two bodies A and B are of same mass and same amount of heat is given to both of them.

Both A and B have the same specific heat capacity but A has greater thermal conductivity

The specific heat capacity of A is more than that of B

The specific heat capacity of A is less than that of B

Both A and B have the same specific heat capacity but A has greater thermal conductivity

Both A and B have the same specific heat capacity but B has greater thermal conductivity

During melting process the heat given to a body is utilised in

Increasing the kinetic energy of the molecules

Increasing the density of the material

Increasing the potential energy of the molecules

Increasing the kinetic energy of the molecules

At normal temperature, due to a puncture, the compressed air inside the tube of a car wheel suddenly starts coming out. Then the air inside the tube

May become hotter or cooler depending on the amount of water vapour present in the air

Remains at the same temperature

May become hotter or cooler depending on the amount of water vapour present in the air

How can boiling point of a liquid be reduced?

By adding a solid of lower melting point

By dissolving a soluble solid in it

By increasing the pressure on the liquid

By decreasing the pressure on the liquid

Low temperatures (cryogenise) find application in

Surgery, magnetic levitation and telemetry

Space travel, surgery and magnetic levitation

Surgery, magnetic levitation and telemetry

Space travel, surgery and telemetry

Space travel, magnetic levitation and telemetry

A polished metal plate with rough black spot on it is heated to about 2000 K and quickly taken to a dark room. Then the spot

Will appear darker than the plate

Will appear brighter than the plate

Will appear darker than the plate

And the plate will appear equally bright

The water from a hand-pump is warm in winter because

The pumping process causes friction which warms up the water

Our body is cold in winter and water appears to be warm

The temperature inside the earth is higher than the atmospheric temperature

The pumping process causes friction which warms up the water

Inside water comes out and absorbs heat from the environment

The specific heat of a gas at constant pressure is greater than the specific heat at constant volume because

Work is done in the expansion of the gas at constant volume

Work is done in the expansion of the gas at constant pressure

Work is done in the expansion of the gas at constant volume

The attraction between the molecules increases at constant pressure

The molecular collision increases at constant pressure

According to Newton's law of cooling, the rate of cooling of a body is proportional to the

difference of the temperature of the body and its surroundings

The product of the pressure and volume of an ideal gas is

Inversely proportional to its temperature

Approximately equal to the universal gas constant

directly proportional to its temperature

Inversely proportional to its temperature

The pressure exerted on the walls of the container by a gas is due to the fact that the gas molecules

Are accelerated towards the walls

Change their momenta due to collision with the walls

Two blocks of ice when pressed together join to form one block because

Of heat produced during pressing

Of cold produced during pressing

Melting point of ice increases with increase of pressure

Melting point of ice decrease with increase of pressure

It is difficult to cook at high altitudes because

There is less oxygen in the air

Due to falling temperature, more heat has to be given

Due to decrease in atmospheric pressure, the boiling point of water decreases

When an ideal gas under goes an isothermal expansion, the pressure of the gas in the enclosure falls. This is due to

Decrease in the frequency of collision and the change of momentum per collision

Decreased in the change of momentum per collision

Decrease in the frequency of collision

Decrease in the frequency of collision and the change of momentum per collision

Decrease in neither the frequency of collision nor the change of momentum per collision

In a pressure cooker the cooking is fast because

The boiling point of water is lowered by the increased pressure

The boiling point of water is raised by the increased pressure inside the cooker

The boiling point of water is lowered by the increased pressure

More steam is available to cook the food at 1000 C

A cooking pot should have

Low specific heat and low conductivity

High specific heat and low conductivity

High specific heat and high conductivity

Low specific heat and low conductivity

Low specific heat and high conductivity

A piece of metal and a piece of wood are kept at temperature of 45 C on touching the two of them with hand

The distinction in the hotness will not be possible

The two will appear equally hot

The piece of wood will appear hotter than the piece of metal

The piece of metal will appear hotter than the piece of wood

The distinction in the hotness will not be possible

A solid sphere of radius R and a hollow sphere of inner radius R / 2 and outer radius R, made of copper, are heated to the same temperature and are allowed to cool in the same environment. Then

Both the spheres attain room temperature at the same time

A solid cube and solid sphere of the same material have equal surface areas. Both are at the same temperature of 120 C then

The sphere will cool down faster than the cube

Both of them will cool down at the same rate

The cube will cool down faster than the sphere

The sphere will cool down faster than the cube

If a graph is plotted taking the temperature in fahrenheit along the Y-axis and the corresponding temperature in celsius along X-axis it will be straight line

Having a positive intercept on X-axis

Having a positive intercept on the Y-axis

Having a positive intercept on X-axis

Having negative intercepts on both the axes

A glass container cracks when very hot tea is poured into it. A probable reason for this is the

High thermal conductivity of glass

Low thermal conductivity of glass

High thermal conductivity of glass

If the thermal capacity of a body is infinite, then

Heat can never be extracted from it

The temperature of the body can not be altered by adding or extracting any amount of heat

A closed bottle containing water at room temperature is taken to the moon and then the lid is opened. The water will

Decompose into hydrogen and oxygen

PV / T = constant is true for

Neither isothermal nor adiabatic changes

Both isothermal and adiabatic changes

Neither isothermal nor adiabatic changes

If is hotter for the same distance over the top of a flame than it is on one side of it because

Of some reason other than the above three

A piece of blue glass heated to a high temperature and piece of red glass at room temperature are taken inside dimly-lit room Then

Both the pieces will look red but the blue piece will be dimmer

The blue piece will look blue and the red piece will red as usual

Both the pieces will look equally red

The blue piece will look brighter red as compared to the red piece

Both the pieces will look red but the blue piece will be dimmer

In the winter season if we touch two blocks one of iron and another of wood in the early morning then the block of iron appears to be more cold because

Iron is a bad conductor of heat in comparison of the wood

The temperature of the iron block is less than that of the wooden block

Iron is a good conductor of heat in comparison of the wood

Iron is a bad conductor of heat in comparison of the wood

The block of iron is heavier than the wooden block

Woollen clothes keep the body warm because

Wool absorbs radiant heat from outer objects

Wool increases the temperature of the body

Wool is the bad conductor of the heat so it does not allow heat to flow out of the body

Wool absorbs radiant heat from outer objects

Wool rejects heat from outer objects

An electric heater, kept in vacuum, is heated continuously by passing electric current. Its temperature

Will stop rising after some time as it will lose heat to the surrounding by conduction

Will become constant after some time because of loss of heat due to radiation

A large iceberg melts at the base but not at the top because

Ice at the top is different kind

The base of iceberg remains in warmer conditions

Ice at the base contains impurities

Higher pressure at the base lowers the melting point of ice

Ice at the top is different kind

Equal in solids, liquids and gases

Faster in solids than in liquids and gases

Faster in gases than in solids and gases

Faster in gases than in liquids and gases

Equal in solids, liquids and gases

205 + Mcqs in Heat in Physics Page 4 McqOptions

151.	Water equivalent is equal to the product of
A.	Mass and Avogadro number
B.	Mass and gas counstant
C.	Mass and specific heat
D.	Latent heat and volume of water
Answer» D. Latent heat and volume of water

Discussion

152.	While measuring the thermal conductivity of a liquid, we keep the upper part hot and the lower part cool because
A.	Heat conduction is easier downwards
B.	Convection gets stopped in this way
C.	Radiation gets stopped in this way
D.	It is easier and more convenient to do so
Answer» C. Radiation gets stopped in this way

Discussion

153.	The critical temperature of a gas is the temperature
A.	At which Boyle's law is strictly obeyed
B.	At which the gas liquefies at a pressure of one atmosphere
C.	Above which the gas cannot be liquefied
D.	Below which the gas cannot be liquefied
Answer» D. Below which the gas cannot be liquefied

Discussion

154.	Heat capacity of substance is infinite. It means
A.	Infinite heat is given out
B.	Infinite heat is taken in
C.	No change in temperature whether heat is taken in or give out
D.	All of the above
Answer» D. All of the above

Discussion

155.	The unit of temperature adopted by the SI (international system of units) is the celsius and kelvin scales. It is based on the
A.	Melting point of ice
B.	Boiling point of water
C.	Triple point of water corresponding to -0.01 C
D.	Temperature at which solid, liquid and gaseous water are all in equilibrium, i.e., -273 C
Answer» D. Temperature at which solid, liquid and gaseous water are all in equilibrium, i.e., -273 C

Discussion

156.	Which one of the following statements is correct. Transfer of heat energy from a heater coil to the cooking vessel takes place through the process of
A.	Convection only
B.	Conduction and convection only
C.	Radiation and convection only
D.	Convection, conduction and radiation
Answer» D. Convection, conduction and radiation

Discussion

157.	Two bodies A and B are of same mass and same amount of heat is given to both of them.
A.	The specific heat capacity of A is more than that of B
B.	The specific heat capacity of A is less than that of B
C.	Both A and B have the same specific heat capacity but A has greater thermal conductivity
D.	Both A and B have the same specific heat capacity but B has greater thermal conductivity
Answer» C. Both A and B have the same specific heat capacity but A has greater thermal conductivity

Discussion

158.	During melting process the heat given to a body is utilised in
A.	Increasing the temperature
B.	Increasing the density of the material
C.	Increasing the potential energy of the molecules
D.	Increasing the kinetic energy of the molecules
Answer» D. Increasing the kinetic energy of the molecules

Discussion

159.	At normal temperature, due to a puncture, the compressed air inside the tube of a car wheel suddenly starts coming out. Then the air inside the tube
A.	Starts becoming hotter
B.	Starts becoming hotter
C.	Remains at the same temperature
D.	May become hotter or cooler depending on the amount of water vapour present in the air
Answer» D. May become hotter or cooler depending on the amount of water vapour present in the air

Discussion

160.	How can boiling point of a liquid be reduced?
A.	By adding a solid of lower melting point
B.	By dissolving a soluble solid in it
C.	By increasing the pressure on the liquid
D.	By decreasing the pressure on the liquid
Answer» E.

Discussion

161.	Low temperatures (cryogenise) find application in
A.	Space travel, surgery and magnetic levitation
B.	Surgery, magnetic levitation and telemetry
C.	Space travel, surgery and telemetry
D.	Space travel, magnetic levitation and telemetry
Answer» B. Surgery, magnetic levitation and telemetry

Discussion

162.	A polished metal plate with rough black spot on it is heated to about 2000 K and quickly taken to a dark room. Then the spot
A.	Will appear brighter than the plate
B.	Will appear darker than the plate
C.	And the plate will appear equally bright
D.	None of the above
Answer» B. Will appear darker than the plate

Discussion

163.	Metal tea pots have wooden handless because
A.	Wood is bad conductor of heat
B.	It prevents electric shock
C.	It gives beauty to the pots
D.	It is hygienic
Answer» B. It prevents electric shock

Discussion

164.	The water from a hand-pump is warm in winter because
A.	Our body is cold in winter and water appears to be warm
B.	The temperature inside the earth is higher than the atmospheric temperature
C.	The pumping process causes friction which warms up the water
D.	Inside water comes out and absorbs heat from the environment
Answer» C. The pumping process causes friction which warms up the water

Discussion

165.	The specific heat of a gas at constant pressure is greater than the specific heat at constant volume because
A.	Work is done in the expansion of the gas at constant pressure
B.	Work is done in the expansion of the gas at constant volume
C.	The attraction between the molecules increases at constant pressure
D.	The molecular collision increases at constant pressure
Answer» B. Work is done in the expansion of the gas at constant volume

Discussion

166.	Which of the following statement (s) is (are) true about thermal radiations?
A.	(i), (ii) and (iii)
B.	(ii), (iii) and (iv)
C.	(iii) and (iv)
D.	All of them
Answer» E.

Discussion

167.	According to Newton's law of cooling, the rate of cooling of a body is proportional to the
A.	Temperature of the body
B.	Temperature of the surrounding
C.	difference of the temperature of the body and its surroundings
D.	None of the above
Answer» D. None of the above

Discussion

168.	The product of the pressure and volume of an ideal gas is
A.	A constant
B.	Approximately equal to the universal gas constant
C.	directly proportional to its temperature
D.	Inversely proportional to its temperature
Answer» D. Inversely proportional to its temperature

Discussion

169.	The pressure exerted on the walls of the container by a gas is due to the fact that the gas molecules
A.	Lose their kinetic energy
B.	Stick to the walls
C.	Are accelerated towards the walls
D.	Change their momenta due to collision with the walls
Answer» E.

Discussion

170.	Two blocks of ice when pressed together join to form one block because
A.	Of heat produced during pressing
B.	Of cold produced during pressing
C.	Melting point of ice increases with increase of pressure
D.	Melting point of ice decrease with increase of pressure
Answer» E.

Discussion

171.	It is difficult to cook at high altitudes because
A.	There is less oxygen in the air
B.	Due to falling temperature, more heat has to be given
C.	Due to decrease in atmospheric pressure, the boiling point of water decreases
D.	Of high moisture content there
Answer» D. Of high moisture content there

Discussion

172.	Which of the following statements are true regarding heat?
A.	1, 2 and 3
B.	2, 3 and 4
C.	1, 2 and 4
D.	1, 3 and 4
Answer» E.

Discussion

173.	When an ideal gas under goes an isothermal expansion, the pressure of the gas in the enclosure falls. This is due to
A.	Decreased in the change of momentum per collision
B.	Decrease in the frequency of collision
C.	Decrease in the frequency of collision and the change of momentum per collision
D.	Decrease in neither the frequency of collision nor the change of momentum per collision
Answer» C. Decrease in the frequency of collision and the change of momentum per collision

Discussion

174.	In a pressure cooker the cooking is fast because
A.	The boiling point of water is raised by the increased pressure inside the cooker
B.	The boiling point of water is lowered by the increased pressure
C.	More steam is available to cook the food at 1000 C
D.	None of the above
Answer» B. The boiling point of water is lowered by the increased pressure

Discussion

175.	A cooking pot should have
A.	High specific heat and low conductivity
B.	High specific heat and high conductivity
C.	Low specific heat and low conductivity
D.	Low specific heat and high conductivity
Answer» C. Low specific heat and low conductivity

Discussion

176.	A piece of metal and a piece of wood are kept at temperature of 45 C on touching the two of them with hand
A.	The two will appear equally hot
B.	The piece of wood will appear hotter than the piece of metal
C.	The piece of metal will appear hotter than the piece of wood
D.	The distinction in the hotness will not be possible
Answer» D. The distinction in the hotness will not be possible

Discussion

177.	A piece of glass is heated to high temperature and then allowed to cool. If it cracks, a possible reason for this is the following property of glass
A.	Low thermal conductivity
B.	High thermal conductivity
C.	High specific heat
D.	Low specific heat
Answer» B. High thermal conductivity

Discussion

178.	A solid sphere of radius R and a hollow sphere of inner radius R / 2 and outer radius R, made of copper, are heated to the same temperature and are allowed to cool in the same environment. Then
A.	Hollow sphere cools faster
B.	Both the spheres attain room temperature at the same time
C.	Solid sphere cools faster
D.	None of the above
Answer» B. Both the spheres attain room temperature at the same time

Discussion

179.	A solid cube and solid sphere of the same material have equal surface areas. Both are at the same temperature of 120 C then
A.	Both of them will cool down at the same rate
B.	The cube will cool down faster than the sphere
C.	The sphere will cool down faster than the cube
D.	None of the above
Answer» C. The sphere will cool down faster than the cube

Discussion

180.	If a graph is plotted taking the temperature in fahrenheit along the Y-axis and the corresponding temperature in celsius along X-axis it will be straight line
A.	Having a positive intercept on the Y-axis
B.	Having a positive intercept on X-axis
C.	Passing through origin
D.	Having negative intercepts on both the axes
Answer» B. Having a positive intercept on X-axis

Discussion

181.	A glass container cracks when very hot tea is poured into it. A probable reason for this is the
A.	Low thermal conductivity of glass
B.	High thermal conductivity of glass
C.	Low specific heat of glass
D.	None of the above
Answer» B. High thermal conductivity of glass

Discussion

182.	During adiabatic compression of a gas its temperature
A.	Remains constant
B.	Becomes zero
C.	Falls
D.	Rises
Answer» E.

Discussion

183.	If the thermal capacity of a body is infinite, then
A.	Heat can never be added to it
B.	Heat can never be extracted from it
C.	The temperature of the body can not be altered by adding or extracting any amount of heat
D.	It has infinite amount of heat
Answer» D. It has infinite amount of heat

Discussion

184.	A closed bottle containing water at room temperature is taken to the moon and then the lid is opened. The water will
A.	Freeze
B.	Boil
C.	Decompose into hydrogen and oxygen
D.	Not change at all
Answer» C. Decompose into hydrogen and oxygen

Discussion

185.	The energy that can harness heat stored below the earth's surface is known as
A.	Thermal energy
B.	Nuclear energy
C.	Tidal energy
D.	Geo-thermal energy
Answer» E.

Discussion

186.	The amount of heat required to raise the temperature of a body through 1 K is called its
A.	Thermal capacity
B.	Entropy
C.	Specific heat
D.	Water equivalent
Answer» B. Entropy

Discussion

187.	The first operation involved in a Carnot cycle is
A.	Isothermal expansion
B.	Adiabatic expansion
C.	Isothermal compression
D.	Adiabatic compression
Answer» B. Adiabatic expansion

Discussion

188.	PV / T = constant is true for
A.	Isothermal changes only
B.	Adiabatic changes only
C.	Both isothermal and adiabatic changes
D.	Neither isothermal nor adiabatic changes
Answer» D. Neither isothermal nor adiabatic changes

Discussion

189.	In which of the following process the internal energy of a system remains constant?
A.	Adiabatic
B.	Isothermal
C.	Isobaric
D.	None of these
Answer» C. Isobaric

Discussion

190.	A body cools from 85 C to 80 C in 5 minutes. The time taken to cool from 80 C to 75 C is
A.	Less than 5 minutes
B.	More than 5 minutes
C.	5 minutes
D.	None of these
Answer» C. 5 minutes

Discussion

191.	If the atmospheric temperature and the due point are nearly equal then
A.	The relative humidity is 100%
B.	The relative humidity is zero
C.	The relative humidity is 50%
D.	None of the above
Answer» B. The relative humidity is zero

Discussion

192.	A body cools from 60 C to 50 C in 10 minutes when kept in air at 30 C. In the next 10 minutes its temperature will be
A.	Below 40 C
B.	40 C
C.	Above 40 C
D.	Can not be predicted
Answer» D. Can not be predicted

Discussion

193.	A sample of gas expands from volume V
A.	Iso-thermal
B.	Isobaric
C.	Adiabatic
D.	Equal in all cases
Answer» C. Adiabatic

Discussion

194.	If is hotter for the same distance over the top of a flame than it is on one side of it because
A.	More heat is radiated upwards
B.	Air conducts more heat upwards
C.	Convection takes heat upward
D.	Of some reason other than the above three
Answer» D. Of some reason other than the above three

Discussion

195.	A piece of blue glass heated to a high temperature and piece of red glass at room temperature are taken inside dimly-lit room Then
A.	The blue piece will look blue and the red piece will red as usual
B.	Both the pieces will look equally red
C.	The blue piece will look brighter red as compared to the red piece
D.	Both the pieces will look red but the blue piece will be dimmer
Answer» D. Both the pieces will look red but the blue piece will be dimmer

Discussion

196.	In the winter season if we touch two blocks one of iron and another of wood in the early morning then the block of iron appears to be more cold because
A.	The temperature of the iron block is less than that of the wooden block
B.	Iron is a good conductor of heat in comparison of the wood
C.	Iron is a bad conductor of heat in comparison of the wood
D.	The block of iron is heavier than the wooden block
Answer» C. Iron is a bad conductor of heat in comparison of the wood

Discussion

197.	Woollen clothes keep the body warm because
A.	Wool increases the temperature of the body
B.	Wool is the bad conductor of the heat so it does not allow heat to flow out of the body
C.	Wool absorbs radiant heat from outer objects
D.	Wool rejects heat from outer objects
Answer» C. Wool absorbs radiant heat from outer objects

Discussion

198.	An electric heater, kept in vacuum, is heated continuously by passing electric current. Its temperature
A.	Will go on rising with time
B.	Will stop rising after some time as it will lose heat to the surrounding by conduction
C.	Will become constant after some time because of loss of heat due to radiation
D.	None of the above
Answer» D. None of the above

Discussion

199.	A large iceberg melts at the base but not at the top because
A.	The base of iceberg remains in warmer conditions
B.	Ice at the base contains impurities
C.	Higher pressure at the base lowers the melting point of ice
D.	Ice at the top is different kind
Answer» D. Ice at the top is different kind

Discussion

200.	Rate of diffusion is
A.	Faster in solids than in liquids and gases
B.	Faster in gases than in solids and gases
C.	Faster in gases than in liquids and gases
D.	Equal in solids, liquids and gases
Answer» D. Equal in solids, liquids and gases

Discussion

Explore topic-wise MCQs in Physics.

Water equivalent is equal to the product of

While measuring the thermal conductivity of a liquid, we keep the upper part hot and the lower part cool because

The critical temperature of a gas is the temperature

Heat capacity of substance is infinite. It means

The unit of temperature adopted by the SI (international system of units) is the celsius and kelvin scales. It is based on the

Which one of the following statements is correct. Transfer of heat energy from a heater coil to the cooking vessel takes place through the process of

Two bodies A and B are of same mass and same amount of heat is given to both of them.

During melting process the heat given to a body is utilised in

At normal temperature, due to a puncture, the compressed air inside the tube of a car wheel suddenly starts coming out. Then the air inside the tube

How can boiling point of a liquid be reduced?

Low temperatures (cryogenise) find application in

A polished metal plate with rough black spot on it is heated to about 2000 K and quickly taken to a dark room. Then the spot

Metal tea pots have wooden handless because

The water from a hand-pump is warm in winter because

The specific heat of a gas at constant pressure is greater than the specific heat at constant volume because

Which of the following statement (s) is (are) true about thermal radiations?

According to Newton's law of cooling, the rate of cooling of a body is proportional to the

The product of the pressure and volume of an ideal gas is

The pressure exerted on the walls of the container by a gas is due to the fact that the gas molecules

Two blocks of ice when pressed together join to form one block because

It is difficult to cook at high altitudes because

Which of the following statements are true regarding heat?

When an ideal gas under goes an isothermal expansion, the pressure of the gas in the enclosure falls. This is due to

In a pressure cooker the cooking is fast because

A cooking pot should have

A piece of metal and a piece of wood are kept at temperature of 45 C on touching the two of them with hand

A piece of glass is heated to high temperature and then allowed to cool. If it cracks, a possible reason for this is the following property of glass

A solid sphere of radius R and a hollow sphere of inner radius R / 2 and outer radius R, made of copper, are heated to the same temperature and are allowed to cool in the same environment. Then

A solid cube and solid sphere of the same material have equal surface areas. Both are at the same temperature of 120 C then

If a graph is plotted taking the temperature in fahrenheit along the Y-axis and the corresponding temperature in celsius along X-axis it will be straight line

A glass container cracks when very hot tea is poured into it. A probable reason for this is the

During adiabatic compression of a gas its temperature

If the thermal capacity of a body is infinite, then

A closed bottle containing water at room temperature is taken to the moon and then the lid is opened. The water will

The energy that can harness heat stored below the earth's surface is known as

The amount of heat required to raise the temperature of a body through 1 K is called its

The first operation involved in a Carnot cycle is

PV / T = constant is true for

In which of the following process the internal energy of a system remains constant?

A body cools from 85 C to 80 C in 5 minutes. The time taken to cool from 80 C to 75 C is

If the atmospheric temperature and the due point are nearly equal then

A body cools from 60 C to 50 C in 10 minutes when kept in air at 30 C. In the next 10 minutes its temperature will be

A sample of gas expands from volume V

If is hotter for the same distance over the top of a flame than it is on one side of it because

A piece of blue glass heated to a high temperature and piece of red glass at room temperature are taken inside dimly-lit room Then

In the winter season if we touch two blocks one of iron and another of wood in the early morning then the block of iron appears to be more cold because

Woollen clothes keep the body warm because

An electric heater, kept in vacuum, is heated continuously by passing electric current. Its temperature

A large iceberg melts at the base but not at the top because

Rate of diffusion is