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Thermal Properties of Matter Test - 11
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Thermal Properties of Matter Test - 11

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  • Question 1/10
    4 / -1
    Two spherical black bodies of radii r1 and r2 and with surface temperatures T1 and T2 respectively radiate the same power. Then, the ratio of r1 and r2 will be
  • Question 2/10
    4 / -1
    The temperatures of two bodies A and B are respectively 727°C and 327°C. The ratio HA : HB of the rates of heat radiated by them is
  • Question 3/10
    4 / -1
    Three very large plates of same area are kept parallel and close to each other. They are considered as ideal black surfaces and have very high thermal conductivity. The first and third plates are maintained at temperatures 2T and 3T respectively. The temperature of the middle (i.e. second ) plate under steady state condition, is
  • Question 4/10
    4 / -1
    Two spheres of radii 8 cm and 2 cm are cooling. Their temperatures are 127°C and 527°C respectively. Find the ratio of energy radiated by them in the same time
  • Question 5/10
    4 / -1
    'Good emitters are good absorbers' is a statement concluded from
  • Question 6/10
    4 / -1
    A black body at a temperature of 227°C radiates heat at the rate of 5 cal cm-2s -1. At a temperature of 727°C, the rate of heat radiated per unit area in cal cm 2s-1 is
  • Question 7/10
    4 / -1
    The wavelength X. = 5.5 × 10-7m when temperature of the sun is 5500 K. If the furnace has wavelength λm equal to 1 is 10-7m, then temperature of furnace is
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  • Question 8/10
    4 / -1
    We consider the radiation emitted by the human body. Which of the following statement is true?
  • Question 9/10
    4 / -1
    The temperature at which a black body ceases to radiate energy, is
  • Question 10/10
    4 / -1
    In which mode of transmission, the heat waves travel along straight line with the speed of light?
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