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Thermal Properties of Matter · Question 42

AIPMT 2002MCQEasy📈 Topic in 38% papers+4−1
1

Consider two rods of same length and different specific heats (S1, S2), conductivities (K1, K2) and area of cross-sections (A1, A2) and both having temperatures T1 and T2 at their ends. If rate of loss of heat due to conduction is equal, then

  1. K1A1 = K2A2
  2. K1A1S1 = K2A2S2
  3. K2A1 = K1A2
  4. K2A1S2 = K1A2S1

Answer

(1) K1A1 = K2A2

Solution

Rate of heat flow by conduction: Qt = KA(T1 - T2)L

L and (T1 - T2) are the same for both rods and the rates are equal

K1A1(T1 - T2)L = K2A2(T1 - T2)L

K1A1 = K2A2 (specific heat does not enter the steady-state rate)

Answer: (1)

AIPMT 2002

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2

For a black body at temperature 727 , its radiating power is 60 watt and temperature of surrounding is 227 . If temperature of black body is changed to 1227 then its radiating power will be

  1. 304 W
  2. 320 W
  3. 240 W
  4. 120 W
AIPMT 2002
3

Which of the following is closest to an ideal black body?

  1. lamp black
  2. cavity maintained at constant temperature
  3. platinum black
  4. a lump of charcoal heated to high temperature.
AIPMT 2002
4

The Wien's displacement law expresses relation between

  1. wavelength corresponding to maximum energy and temperature
  2. radiation energy and wavelength
  3. temperature and wavelength
  4. colour of light and temperature.
AIPMT 2002
5

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
AIPMT 2001
6

Gravitational force is required for

  1. stirring of liquid
  2. convection
  3. conduction
  4. radiation
AIPMT 2000
7

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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