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MCQs

Heat Radiation, Thermal Properties Of Matter, Dual Nature Of Matter

Total Questions : 247 | Page 21 of 25 pages
Question 201. The value of solar constant varies between
  1.    1123 and 1237 W/m²
  2.    1345 and 1453 W/m²
  3.    1987 and 2346 W/m²
  4.    1335 and 1815 W/m²
 Discuss Question
Answer: Option D. -> 1335 and 1815 W/m²
Answer: (d).1335 and 1815 W/m²
Question 202. The heat energy absorbed by a known area in a fixed time is determined with the help of an instrument called
  1.    Psychrometer
  2.    Pyrheliometer
  3.    Thermometric well
  4.    Any instrument
 Discuss Question
Answer: Option B. -> Pyrheliometer
Answer: (b).Pyrheliometer
Question 203. The total amount of heat energy received by the sphere of radius r is
  1.    2 π R² S
  2.    6 π R² S
  3.    4 π R² S
  4.    π R² S
 Discuss Question
Answer: Option C. -> 4 π R² S
Answer: (c).4 π R² S
Question 204. The temperature of the photosphere, referred to as the effective temperature of the sun, is usually taken as
  1.    3000 K
  2.    4000 K
  3.    5000 K
  4.    6000 K
 Discuss Question
Answer: Option D. -> 6000 K
Answer: (d).6000 K
Question 205. Amount of heat energy radiated by unit surface of the sun in the same time workout as
Take, R = mean distance of earth from the sun and r = radius of sun
  1.    E = π R² S/4 π R²
  2.    E = 4 π R² S/4 π R²
  3.    E = 4 π R²
  4.    E = 4 π R² S
 Discuss Question
Answer: Option B. -> E = 4 π R² S/4 π R²
Answer: (b).E = 4 π R² S/4 π R²
Question 206. The approximate distribution of the flow of sun’s energy to the earth’s surface is
  1.    53% is reflected back to space
  2.    53% is transmitted to the earth
  3.    9% is scattered
  4.    22% is absorbed in the atmosphere
 Discuss Question
Answer: Option C. -> 9% is scattered
Answer: (c).9% is scattered
Question 207. Temperature of sun can be workout from
  1.    Wein’s displacement law
  2.    Stefan-Boltzmann law
  3.    Kirchhoff’s law
  4.    All of the Mentioned
 Discuss Question
Answer: Option A. -> Wein’s displacement law
Answer: (a).Wein’s displacement law
Question 208. Engineering problems of practical interest are involved with heat exchange between two or more surfaces, and this exchange is strongly dependent upon
(i) Radiative properties
(ii) Temperature levels
(iii) Surface geometrics
Identify the correct statements
  1.    1 and 2
  2.    1 and 3
  3.    2 and 3
  4.    1, 2 and 3
 Discuss Question
Answer: Option D. -> 1, 2 and 3
Answer: (d).1, 2 and 3
Question 209. A thin shield of emissivity E3 on both sides is placed between two infinite parallel plates of emissivities E1 and E2 and temperatures T1 and T2. If E1 = E2 = E3, then the fraction radiant energy transfer without shield takes the value
  1.    0.25
  2.    0.50
  3.    0.75
  4.    1.25
 Discuss Question
Answer: Option B. -> 0.50
Answer: (b).0.50
Question 210. The fraction of the radiative energy that is diffused from one surface element and strikes the other surface directly with no intervening reflections is called
(i) Radiation shape factor
(ii) Geometrical factor
(iii) Configuration factor
Choose the correct answer
  1.    1 only
  2.    2 only
  3.    1, 2 and 3
  4.    3 only
 Discuss Question
Answer: Option C. -> 1, 2 and 3
Answer: (c).1, 2 and 3

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