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Thermal Properties of Matter · Question 47

AIPMT 2000MCQEasy📈 Topic in 0% papers+4−1
1

Gravitational force is required for

  1. stirring of liquid
  2. convection
  3. conduction
  4. radiation

Answer

(2) convection

Solution

In convection, the heated part of a fluid becomes less dense and rises while the denser, colder part sinks.

This rising and sinking is due to buoyancy, which exists only because of gravity.

Natural convection needs gravitational force; conduction and radiation do not.

Answer: (2)

AIPMT 2000

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2

A black body emits maximum energy at wavelength m at 2000 K. Its corresponding wavelength at 3000 K will be

  1. 32 m
  2. 23 m
  3. 1681 m
  4. 8116 m
AIPMT 2000

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