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Thermal Properties of Matter · Question 38

AIPMT 2005MCQEasy📈 Topic in 38% papers+4−1
1

Which of the following rods, (given radius r and length l) each made of the same material and whose ends are maintained at the same temperature will conduct most heat?

  1. r = r0, l = l0
  2. r = 2r0, l = l0
  3. r = r0, l = 2l0
  4. r = 2r0, l = 2l0

Answer

(2) r = 2r0, l = l0

Solution

As per NCERT, rate of heat flow H = KA(T1 - T2)l with A = r2

Same material and same temperature difference, so H r2l

(1) r02l0 (2) 4r02l0 (3) r022l0 (4) 4r022l0 = 2r02l0

The rod with r = 2r0, l = l0 conducts the most heat.

Answer: (2)

AIPMT 2005

Keep practising — Thermal Properties of Matter

2

If m denotes the wavelength at which the radiative emission from a black body at a temperature T K is maximum, then

  1. m T4
  2. m is independent of T
  3. m T
  4. m T-1
AIPMT 2004
3

Consider a compound slab consisting of two different materials having equal thicknesses and thermal conductivities K and 2K, respectively. The equivalent thermal conductivity of the slab is

  1. 23K
  2. 2K
  3. 3K
  4. 43K
AIPMT 2003
4

Unit of Stefan's constant is

  1. watt m2 K4
  2. watt m2/K4
  3. watt/m2 K
  4. watt/m2K4
AIPMT 2002
5

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
AIPMT 2002
6

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
7

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
8

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
9

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
10

Gravitational force is required for

  1. stirring of liquid
  2. convection
  3. conduction
  4. radiation
AIPMT 2000
11

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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