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MCQs 1: Which phenomenon is related to the term radiation?

magnetic phenomenon gravity electromagnetic phenomenon none of the above
Answer Explanation

MCQs 2: Thermal radiation takes place from a body by electromagnetic waves as a result of

the weight of the body the magnetic power of the body the temperature of the body none of the above
Answer Explanation

MCQs 3: The range of waves within which all possible frequencies of electromagnetic radiation are represented is called as

electromagnetic frequencies electromagnetic spectrum electromagnetic range none of the above
Answer Explanation

MCQs 4: How is the wavelength of radiation (λ) calculated, when propagation velocity (C) and frequency (ν) of the radiation is given?

λ = C x ν λ = C / ν λ = ν / C none of the above
Answer Explanation

MCQs 5: What is the approximate wavelength range of thermal radiation?

0.1 to 100 μm (micrometer) 0.1 to 100 nm (nanometer) 0.1 to 100 cm (centimeter) none of the above
Answer Explanation

MCQs 6: The wavelength range of the visible light is about

350 to 750 μm (micrometer) 350 to 750 nm (nanometer) 350 to 750 cm (centimeter) none of the above
Answer Explanation

MCQs 7: Which of the following bodies will not be able to emit radiation continuously?

a body with very high temperature placed in air medium a body with temperature 0 °C placed in air medium a body with temperature 0 °C placed in vacuum none of the above
Answer Explanation

MCQs 8: When a body receives radiation in the wavelength range of 0.1 to 100 μm (micrometer), then its temperature

increases decreases does not change unpredictable
Answer Explanation

MCQs 9: What is emissive power of a body?

total radiation emitted by the body per unit volume and time total radiation emitted by the body per unit temperature and time total radiation emitted by the body per unit area and time none of the above
Answer Explanation

MCQs 10: Which of the following is NOT a type of condensation heat transfer process?

drop-wise condensation bulk-wise condensation film-wise condensation none of the above
Answer Explanation

MCQs 11: Which surface does the drop-wise condensation occur on?

wettable surface non-wettable surface both a. and b. none of the above
Answer Explanation

MCQs 12: How can the rates of heat transfer from drop-wise condensation and film condensation be compared?

the rate of heat transfer from drop-wise condensation is lower than that of film condensation the rate of heat transfer from drop-wise condensation is higher than that of film condensation the rate of heat transfer from drop-wise condensation is equal to that of film condensation unpredictable
Answer Explanation

MCQs 13: Film condensation occurs on a surface when

condensate can wet all the surface condensate cannot wet the surface both a. and b. none of the above
Answer Explanation

MCQs 14: The thermal resistance for heat transfer is low in

drop-wise condensation film condensation both drop-wise and film condensation unpredictable
Answer Explanation

MCQs 15: The conduction heat transfer with combination of transfer of material also is called as

material conduction heat transfer convection heat transfer solid convection heat transfer none of the above
Answer Explanation

MCQs 16: According to the Fourier's law of heat conduction, the rate of heat transfer by conduction depends upon

area of cross section normal to the heat flow temperature gradient both a. and b. none of the above
Answer Explanation

MCQs 17: What is the temperature gradient in the conduction heat transfer?

change in temperature per unit change in time change in temperature per unit change in distance in the direction of heat flow change in temperature per unit change in cross-sectional area normal to the direction of heat flow change in temperature per unit change in cross-sectional area parallel to the direction of heat flow
Answer Explanation

MCQs 18: Why is the negative sign introduced in the equation of Fourier's law of heat conduction? q = – kA (dT / dx)

because heat transfer rate is inversely proportional to temperature gradient because value of thermal conductivity k is negative because heat is transferred from higher temperature to lower temperature none of the above
Answer Explanation

MCQs 19: The value of thermal conductivity k depends upon

the material through which the heat is transferred the intensity of heat energy which is being transferred the area which is parallel to the heat transfer all of the above
Answer Explanation

MCQs 20: The materials which have low thermal conductivity are called as ____________

thermal conductors thermal resistors thermal insulators none of the above
Answer Explanation

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