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Heat Transfer

Free 92+ Heat Transfer MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Practise below with answers and explanations.

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Heat Transfer — MCQs for Pakistan government job tests

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Heat Transfer

Practice questions

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1.According to Wien's displacement law, the wavelength at which a blackbody emits maximum radiation is directly related to which of the following?

The absolute temperature (T)The square of the current (I²)Frequency (f)Time (t)The reciprocal of radius (1/r)

2.Under what condition, based on radiative characteristics, is a material considered opaque?

p = 0, x = 0, and a = 1p = 1, x = 0, and a = 0p = 0, x = 1, and a = 0x = 0, and the sum of a and p equals 1a = 0, and the sum of x and p equals 1

3.Under which condition based on radiative characteristics does an object appear white?

p = 0, x = 0, and a = 1p = 1, x = 0, and a = 0p = 0, x = 1, and a = 0x = 0, with a + p = 1a = 0, with x + p = 1

4.Which principle states that the ratio of a body's emissive power to its absorptive power is constant for all materials and equals the emissive power of an ideal black body?

Kirchhoff’s lawStefan’s lawWien’s lawPlanck’s lawBlack body radiation law

5.How do the thermal diffusivities of solids typically compare to those of liquids and gases?

Lower than the thermal diffusivity of gasesSmaller than that of liquidsHigher than those of both liquids and gasesApproximately equal to the values for liquids and gasesNone of the above

6.According to Stefan's law, the total energy radiated per second per unit area by a black body is directly proportional to which of the following?

The absolute temperatureThe square of the temperature (T²)The fifth power of the temperature (T⁵)The fourth power of the temperature (T⁴)The reciprocal of the temperature (1/T)

7.Under which conditions related to radiative properties is a body considered black?

p = 0, x = 0, and a = 1p = 1, x = 0, and a = 0p = 0, x = 1, and a = 0x = 0, with a + p = 0a = 0, with x + p = 1

8.The total emissive power refers to the total radiation energy emitted by a black body per unit of what?

temperaturematerial thicknesssurface areatime intervalsurface area and time

9.A thermally transparent material reflects 40% of the incoming radiant energy on its surface. If the material's transmissivity is 0.15, what is the emissivity of its surface?

0.450.550.400.750.60

10.Which factors influence the emissive power of a material?

Its temperatureThe wavelength involvedThe material's physical propertiesAll of these factorsNone of these factors

11.What term describes the ratio of energy absorbed by a surface to the total energy incident upon it?

absorptive poweremissive powerabsorptivityemissivitynone of these

12.The quantity of radiation emitted primarily depends on which of the following factors?

the physical properties of the objectthe object's temperaturethe characteristics of the object's surfaceall the factors mentioned abovenone of these factors

13.Under which condition does a body's absorptivity equal its emissivity?

At every temperatureOnly at a specific temperatureWhen the system reaches thermal equilibriumAt the critical temperatureFor a highly reflective surface

14.Under what conditions related to radiative properties does a body become transparent?

p = 0, x = 0, and a = 1p = 1, x = 0, and a = 0p = 0, T = 1, and a = 0x = 0, with a + p = 1a = 0, with x + p = 1

15.Two parallel plates separated by 150 mm are kept at temperatures of 1000°C and 70°C respectively. Which mode of heat transfer predominantly occurs between them?

ConvectionNatural convectionForced convectionThermal radiationCombination of radiation and convection

16.How is heat transferred in a regenerator-type heat exchanger?

By mixing the hot and cold fluids directlyBy keeping hot and cold fluids entirely separateBy passing hot and cold fluids alternately over the same surfaceBy repeatedly producing heat internallyThrough indirect heat conduction

17.When the temperature of a solid surface increases from 27°C to 627°C, by what factor does its emissive power change?

3 times6 times9 times27 times81 times

18.What defines a perfect black body in terms of heat radiation?

Has a black appearanceReflects all incident thermal radiationAllows all heat radiation to pass throughAbsorbs heat radiation of every wavelength that strikes itCompletely blocks light transmission

19.Planck's law is applicable to which type of objects?

Ideal black bodiesShiny metallic surfacesVarious colored materialsAll the mentioned optionsNone of the above

20.What characterizes the absorptivity of a grey body?

It changes depending on the temperatureIt depends on the wavelength of the incoming radiationIt varies with both temperature and wavelengthIt remains constant regardless of temperature and wavelengthNo such characteristic exists

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How to prepare with Heat Transfer MCQs

Work through questions topic by topic, then revisit any you answered incorrectly.
Read explanations carefully—they often cover facts that repeat across PPSC, FPSC, and NTS papers.
Pair subject practice with past papers to see how Heat Transfer appears in real exam conditions.

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