(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
because
(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
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