- (A) is black in colour
- (B) reflects all heat
- (C) transmits all heat radiations
- (D) abslprbs heat radiations of all wave lengths falling on it
- (E) fully opaque
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- (A) black bodies
- (B) polished bodies
- (C) all coloured bodies
- (D) all of the above
- (E) none of the above
- (A) varies with temperature
- (B) varies with the wave length of incident ray
- (C) varies with both
- (D) does not vary with temperature and wave length of the incident ray
- (E) there is no such criterion
- (A) absolute temperature (T)
- (B) I2
- (C) f
- (D) t
- (E) 1/r
- (A) p = 0, x = 0 and a = 1
- (B) p=l,x = 0anda = 0
- (C) p = 0, x = 1 and a = 0
- (D) x – 0, a + p = 1
- (E) a=0,x + p= 1.
- (A) p = 0, x = 0 and a = 1
- (B) p=l,T = 0anda = 0
- (C) p = 0, x = 1 and a = 0
- (D) x = 0, a + p = 1
- (E) a = 0, x + p = 1.
- (A) Krichoff’s law
- (B) Stefan’s law
- (C) Wien’ law
- (D) Planck’s law
- (E) Black body law
- (A) less than those for gases
- (B) jess than those for liquids
- (C) more than those for liquids and gases
- (D) more or less same as for liquids and gases
- (E) zerci
- (A) absolute temperature
- (B) T2
- (C) T5
- (D) t
- (E) l/T
- (A) p = 0, x = 0 and a = 1
- (B) p= l,T = 0anda = 0
- (C) p = 0, x = 1 and a = 0
- (D) x = 0, a + p = 0
- (E) a = 0,x + p= 1. where a = absorptivity, p == reflectivity, X = transmissivity
