(a) 0 K
   (b) 273 K
   (c) 373 K
   (d) 100 K
Ans: (b)
104. For accurate scientific work, temperatures are often measured by
   (a) mercury thermometers
   (b) alcohol thermometers
   (c) platinum resistance thermometers
   (d) thermoelectric thermometers
Ans: (c)
105. Pyrometers are instruments used
   (a) for measuring the velocity of wind
   (b) in the manufacture of fireworks
   (c) in finding the coefficient of apparent expansion of a liquid
   (d) for measuring high temperatures
Ans: (d)
106. A solid ball of metal has a spherical cavity inside it. When the ball is
   heated the volume of the cavity will
   (a) increase
   (b) decrease
   (c) remain unaffected
   (d) have its shape changed
Ans: (a)
107. Fish and other aquatic creatures can live inside a deep frozen pond
   (a) fish are cold-blooded animals
   (b) ice is a bad conductor of heat
   (c) there will always be water just beneath the ice level
   (d) they can adapt themselves to live in ice
Ans: (c)
108. Expansion of a rod when heated