Lakshya Education MCQs

Question: Reynolds number is the ratio of
Options:
A. Energy transferred by convection to that by conduction
B. Kinematic viscosity to thermal diffusivity
C. Inertia force to viscous force
D. None of the above
Answer: Option C
Explanation :

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Question 1. Kirchhoff's law states that
  1.     The total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature
  2.     The wave length corresponding to the maximum energy is proportional to the absolute temperature
  3.     The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body
  4.     None of the above
Answer: Option C
Explanation :
Question 2. Metals are good conductors of heat because
  1.     Their atoms collide frequently
  2.     Their atoms are relatively far apart
  3.     They contain free electrons
  4.     They have high density
Answer: Option A
Explanation :
Question 3. Kirchhoff's law states that
  1.     The total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature
  2.     The wave length corresponding to the maximum energy is proportional to the absolute temperature
  3.     The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body
  4.     None of the above
Answer: Option C
Explanation :
Question 4. Metals are good conductors of heat because
  1.     Their atoms collide frequently
  2.     Their atoms are relatively far apart
  3.     They contain free electrons
  4.     They have high density
Answer: Option A
Explanation :
Question 5. If the temperature of a solid surface changes form 27°c to 627°c, then its emissive power changes in the ratio of
  1.     3
  2.     9
  3.     270
  4.     81
Answer: Option D
Explanation :
Question 6. Kirchhoff's law states that
  1.     The total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature
  2.     The wave length corresponding to the maximum energy is proportional to the absolute temperature
  3.     The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body
  4.     None of the above
Answer: Option C
Explanation :

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