Heat: MCQ Test (25 questions)

Question 1 of 25

Bolometer is a device for measuring—

Aof pressure
Bgrowth in plants
Cof thermal radiation
Dof wind speed

Question 2 of 25

If water is cooled from 10°C to 0°C then-

AThe volume of water will decrease up to 4°C and then increase.
BThe density of water will continue to increase and reach a maximum at 4°C
CThe volume of water will continuously decrease and will reach its minimum at 4°C
DThe density of water will decrease up to 4°C and then increase.

Question 3 of 25

The liquid in a thermos flask remains hot or cold for a long time because there is no loss or gain of heat.

AOperation
Bconvection and radiation
Cboth a and B
DNone of these

Question 4 of 25

Mercury is generally used in thermometers because it has-

Ahave high liquidity
Bhas a high density
Chas high conductivity
DHas a high specific heat (SSC)

Question 5 of 25

The heat required to convert a substance from liquid to gas without any change in temperature is called its latent heat?

AEvaporation
BUplift
Ccompaction
Devaporation

Question 6 of 25

In cold countries, alcohol is preferred as a thermometer liquid instead of mercury because-

AAlcohols have lower melting points
BAlcohol is a better conductor of heat
CAlcohol is cheaper than mercury
DWorld production of alcohol exceeds that of mercury.

Question 7 of 25

Which of the following is used as a substitute for mercury in thermometers?

AArsenic
BGaliston
CSelenium
Dbromine

Question 8 of 25

The change of state of matter from solid to liquid is called-

Amelting
BEvaporation
Cboiling
DNone of these

Question 9 of 25

Very high temperatures are measured by-

Aplatinum resistance thermometer
Bfrom a thermocouple thermometer
Cfrom a total radiation pyrometer
Dnitrogen gas thermometer

Question 10 of 25

Which of the following is the most appropriate colour combination for an umbrella to protect from the sun?

Ablack on top white on bottom
Bwhite on top black on bottom
CBlack top and bottom
DWhite top and bottom

Question 11 of 25

The value of latent heat of fusion of ice is-

A0.8 Cal/g
B8 Cal/g
C80 Cal/g
D536Cal/g

Question 12 of 25

Why is the outer bottom of cooking utensils left black?

AIt is difficult to clean it daily.
BBlack surface is a good conductor of heat
CBlack surface is a bad conductor of heat
DBlack surfaces are good heat absorbers

Question 13 of 25

Food is cooked in less time in a pressure cooker because-

AThe temperature of boiling water decreases due to high pressure.
BIt is closed from all sides and hence does not have any effect on air.
CDue to high pressure the temperature of boiling water increases.
DEvaporation of the water used is very low.

Question 14 of 25

When some water is continuously churned, its temperature increases. In this process-

AHeat energy is converted into thermal energy.
BThermal energy is converted into heat energy.
Cmechanical energy is converted into thermal energy
Dthermal energy is converted into mechanical energy

Question 15 of 25

Which is the method of heat transfer in which the particles of the medium do not move?

Aconduction
Bconvection
Cradiation
Dall of which

Question 16 of 25

Increasing the pressure on ice increases its melting point (mp)

Awill decrease
Bwill increase
Cwill remain unchanged
Dwill become zero

Question 17 of 25

Which of the following is the best conductor of heat?

Acold water
Bhot water
Csea water
Ddistilled water

Question 18 of 25

What is the process called when a liquid changes into its vapor before its boiling point?

Aevaporation
Bcompaction
Cfreezing
Dnone of these

Question 19 of 25

The temperature of an object indicates that on contact the heat-

Awill flow from that object to an object at a higher temperature
Bflow from an object of relatively lower temperature to that object
Cflow from that object to the earth
Dflow from the Earth to that object

Question 20 of 25

At what temperature is the density of water maximum?

Aat 0°C
Bat 4°C
Cat -4°C
Dat 100°C

Question 21 of 25

Water is used to cool the radiator of an automobile because-

Awater has a high specific heat
Bthe density of water is low
CWater is cheap
DWater is available at low temperature.

Question 22 of 25

The Sun's heat reaches the Earth through which of the following types of transmission medium?

Aconvection
Bradiation
CSannayan
Dheat exchange

Question 23 of 25

Ice skating demonstrates that increasing the pressure lowers the melting point of ice.

Aincreases
Bremains unchanged
Chappens to
Dfirst decreases then increases

Question 24 of 25

Which temperature measured in Celsius is equal to 300 K?

A30°C
B27°C
C300°C
DNone of these

Question 25 of 25

Even when the temperature reaches 46°C in summer, the camel feels relief from the heat by-

ASitting in the shade of desert plants
BRaising your body temperature to 42°C
Cstoring water in your body
Dnone of the above