Thermal Radiation - MCQs with Answers

Thermal Radiation – MCQs with Answers

1. The radiation takes place

a. through molecular communication
b. through vacuum
c. both a. and b.
d. none of the above

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2. Which phenomenon is related to the term radiation?

a. magnetic phenomenon
b. gravity
c. electromagnetic phenomenon
d. none of the above

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3. Thermal radiation takes place from a body by electromagnetic waves as a result of

a. the weight of the body
b. the magnetic power of the body
c. the temperature of the body
d. none of the above

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4. The range of waves within which all possible frequencies of electromagnetic radiation are represented is called as

a. electromagnetic frequencies
b. electromagnetic spectrum
c. electromagnetic range
d. none of the above

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

a. λ = C x ν
b. λ = C / ν
c. λ = ν / C
d. none of the above

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6. What is the approximate wavelength range of thermal radiation?

a. 0.1 to 100 μm (micrometer)
b. 0.1 to 100 nm (nanometer)
c. 0.1 to 100 cm (centimeter)
d. none of the above

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7. The wavelength range of the visible light is about

a. 350 to 750 μm (micrometer)
b. 350 to 750 nm (nanometer)
c. 350 to 750 cm (centimeter)
d. none of the above

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8. Which of the following bodies will not be able to emit radiation continuously?

a. a body with very high temperature placed in air medium
b. a body with temperature 0 ^oC placed in air medium
c. a body with temperature 0 ^oC placed in vacuum
d. none of the above

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

a. increases
b. decreases
c. does not change
d. unpredictable

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