(b) Stefan"s law
   (c) Planck"s law
   (d) None of these
Ans: (a)
244. Temperature upto the order of 106K is measured through:
   (a) Thermometer
   (b) Pyrometer
   (c) Thermocouple
   (d) None of these
Ans: (b)
245. Good absorbers are good emitters. This is the statement of:
   (a) Kirchhoff"s law
   (b) Prevost"s theory of heat exchange
   (c) Stefan"s law
   (d) Wein"s law
Ans: (a)
246. On which one of the following thermometric scales only positive
   temperature is measured:
   (a) thermodynamical scale
   (b) platinum resistance scale
   (c) celsius scale
   (d) None of these
Ans: (a)
247. The Bernoulli"s theorem is :
   (a) energy conservation
   (b) mass conservation
   (c) Both of these
   (d) None of these
Ans: (a)
248. In which one of the following is the speed of sound the maximum? [IAS
   (Pre) 2006]
   (a) in the air of 0°C