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Thermal Properties of Matter · Question 46

AIPMT 2001MCQEasy📈 Topic in 38% papers+4−1
1

A cylindrical rod has temperatures T1 and T2 at its ends. The rate of flow of heat is Q1 cal/s. If all the linear dimensions are doubled keeping the temperatures constant, then the rate of flow of heat Q2 will be

  1. 4Q1
  2. 2Q1
  3. Q14
  4. Q12

Answer

(2) 2Q1

Solution

Rate of heat flow: Q = KA(T1 - T2)L, with A = r2

Doubling the linear dimensions: r 2r A 4A; L 2L

Q2Q1 = 4A/2LA/L = 2

Q2 = 2Q1

Answer: (2)

AIPMT 2001

Keep practising — Thermal Properties of Matter

2

Gravitational force is required for

  1. stirring of liquid
  2. convection
  3. conduction
  4. radiation
AIPMT 2000
3

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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