Class VIII

Concrete roads on hot days do
  1. expand
  2. contracts
  3. both a and b
  4. break
Water expansion occurs when
  1. freezing
  2. heating
  3. both a and b
  4. boiling
When metal ball loses heat and cools, its volume
  1. increases
  2. decreases
  3. remains same
  4. raised
Uneven expansion of bimetallic strip is used in
  1. thermostats
  2. thermometer
  3. barometers
  4. spectrometers
Instruments which are used to measure temperature are called
  1. barometer
  2. mercury
  3. spectrometer
  4. thermometer
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