Lakshya Education MCQs

Question: Which of the following statement is wrong?
Options:
A. The heat transfer in liquid and gases takes place according to convection
B. The amount of heat flow through a body is dependent upon the material of the body
C. The thermal conductivity of solid metals increases with rise in temperature
D. Logarithmic mean temperature difference is not equal to the arithmetic mean temperature difference
Answer: Option C
Explanation :

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More Questions on This Topic :

Question 1. A perfect black body is one which
  1.     Is black in colour
  2.     Reflects all heat
  3.     Transmits all heat radiations
  4.     Absorbs heat radiations of all wave lengths falling on it
Answer: Option D
Explanation :
Question 2. Planck’s law holds good for
  1.     black bodies
  2.     polished bodies
  3.     all coloured bodies
  4.     all of the above
Answer: Option A
Explanation :
Question 3. Thermal conductivity of a material may be defined as the
  1.     Quantity of heat flowing in one second through one cm cube of material when opposite faces are maintained at a temperature difference of 1°C
  2.     Quantity of heat flowing in one second through a slab of the material of area one cm square, thickness 1 cm when its faces differ in temperature by 1°C
  3.     Heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces
  4.     All of the above
Answer: Option D
Explanation :
Question 4. A perfect black body is one which
  1.     Is black in colour
  2.     Reflects all heat
  3.     Transmits all heat radiations
  4.     Absorbs heat radiations of all wave lengths falling on it
Answer: Option D
Explanation :
Question 5. Which of the following statement is wrong?
  1.     The heat transfer in liquid and gases takes place according to convection
  2.     The amount of heat flow through a body is dependent upon the material of the body
  3.     The thermal conductivity of solid metals increases with rise in temperature
  4.     Logarithmic mean temperature difference is not equal to the arithmetic mean temperature difference
Answer: Option C
Explanation :
Question 6. Planck’s law holds good for
  1.     black bodies
  2.     polished bodies
  3.     all coloured bodies
  4.     all of the above
Answer: Option A
Explanation :

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