MCQs
Heat Radiation, Thermal Properties Of Matter, Dual Nature Of Matter
Total Questions : 247
| Page 25 of 25 pages
Answer: Option C. -> The value of D is (1 – α1) (1 – α2)² E 1
Answer: (c).The value of D is (1 – α1) (1 – α2)² E 1
Answer: (c).The value of D is (1 – α1) (1 – α2)² E 1
Answer: Option B. -> 0.04
Answer: (b).0.04
Answer: (b).0.04
Answer: Option A. -> True
Answer: (a).True
Answer: (a).True
Answer: Option D. -> 227.27 W/m²
Answer: (d).227.27 W/m²
Answer: (d).227.27 W/m²
Answer: Option C. -> 436.40 W/m²
Answer: (c).436.40 W/m²
Answer: (c).436.40 W/m²
Answer: Option A. -> 3.9 * 10¯¹ to 7.8 * 10¯¹ micron meter
Answer: (a).3.9 * 10¯¹ to 7.8 * 10¯¹ micron meter
Answer: (a).3.9 * 10¯¹ to 7.8 * 10¯¹ micron meter
Question 247. A thin metal plate of 4 cm diameter is suspended in atmospheric air whose temperature is 290 K. This plate attains a temperature of 295 K when one of its face receives radiant energy from a heat source at the rate of 2 W. If heat transfer coefficient on both surfaces of the plate is stated to be 87.5 W/m² K, workout the reflectivity of the plate
Answer: Option B. -> 0.45
Answer: (b).0.45
Answer: (b).0.45
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