1:   A black strip of metal is heated by radiation from a point source. The temperature of point source T and its distance from the strip is d. It is found that the strip receives power P. If both the temperature and distance be doubled, then the power received by the strip will be
Options:
  1. P
  2. 2P
  3. 4P
  4. 16 P

Answer: Option 3

Explanation:

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2:   A body takes T minute to cool from 62 degree C to 61 degree C, when temperature of the surroundings is 30 degree C. In the same surroundings the time taken by the body to cool from 46 degree C to 45.5 degree C will be
Options:
  1. more than T
  2. equal to T
  3. less than T
  4. half of T

Answer: Option 2

Explanation:

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3:   Tea in a cup cools from 80 degree C to 60 degree C in first one minute, when the temperature of surroundings is 30 degree C. Time taken for cooling from 60 degree C to 50 degree C will be ---- sec.
Options:
  1. 30
  2. 60
  3. 50
  4. 70

Answer: Option 3

Explanation:

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4:   A black body is emitting heat at the rate of 5 cal/cm2 x sec at 127 degree C. The rate of emission at 927 degree C will be ----- cal/cm2 X sec
Options:
  1. 405
  2. 45
  3. 450
  4. 35

Answer: Option 1

Explanation:

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5:   Hot water initially cools from 60 degree C to 50 degree C in 10 minutes and the next 10 minute it cools down to 42 degree C. The temperature of surroundings will be ---- degree C
Options:
  1. 5
  2. 15
  3. 10
  4. 25

Answer: Option 3

Explanation:

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6:   The formula for efficiency of Carnot engine is
Options:
  1. T2/T1
  2. T1/T2
  3. 1 - (T2/T1)
  4. none of these

Answer: Option 3

Explanation:

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7:   Unit of J is
Options:
  1. J X cal
  2. Cal / J
  3. J / cal
  4. none of these

Answer: Option 2

Explanation:

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8:   An electric fan is operating in a closed room. The air in the room
Options:
  1. gets cool
  2. gets hot
  3. maintains its temperature
  4. none of these

Answer: Option 2

Explanation:

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9:   The efficiency of a Carnot's engine may be 100% if temperature of its sink is
Options:
  1. 0 K
  2. 0 C
  3. 273 K
  4. 0 F

Answer: Option 1

Explanation:

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10:   In the isothermal expansion of an ideal gas
Options:
  1. work done on the gas is zero
  2. heat is drawn from the gas
  3. energy stored in gas remains constant
  4. none of these

Answer: Option 3

Explanation:

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If you want what's in the package you should at least know how to get the string off, is what I say.
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