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Thermal Properties of Matter

AIPMT 2008MCQEasyNot asked in last 5 yrs+4−1
Ques. 1AIPMT 2008

On a new scale of temperature (which is linear) and called the W scale, the freezing and boiling points of water are 39 and 239 respectively. What will be the temperature on the new scale, corresponding to a temperature of 39 on the Celsius scale ?

  1. 200
  2. 139
  3. 78
  4. 117

Answer

(4) 117

Solution

For two linear scales, W - 39239 - 39 = C - 0100 - 0

W - 39200 = 39100

W - 39 = 78

W = 117

Answer: (4)

Keep practising — Thermal Properties of Matter

Ques. 2AIPMT 2007

Assuming the sun to have a spherical outer surface of radius r, radiating like a black body at temperature t C, the power received by a unit surface, (normal to the incident rays) at a distance R from the centre of the sun is where is the Stefan's constant.

  1. r2 (t+273)44 2
  2. 16 2r2 4R2
  3. r2 (t+273)4R2
  4. 4 2 4R2
Ques. 3AIPMT 2007

A black body is at 727 . It emits energy at a rate which is proportional to

  1. (1000)4
  2. (1000)2
  3. (727)4
  4. (727)2
Ques. 4AIPMT 2006

A black body at 1227 emits radiations with maximum intensity at a wavelength of 5000 A. If the temperature of the body is increased by 1000 , the maximum intensity will be observed at

  1. 3000 A
  2. 4000 A
  3. 5000 A
  4. 6000 A
Ques. 5AIPMT 2005

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
Ques. 6AIPMT 2004

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
Ques. 7AIPMT 2003

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
Ques. 8AIPMT 2002

Unit of Stefan's constant is

  1. watt m2 K4
  2. watt m2/K4
  3. watt/m2 K
  4. watt/m2K4
Ques. 9AIPMT 2002

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
Ques. 10AIPMT 2002

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
Ques. 11AIPMT 2002

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.

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