Class X

Handle of soldering iron rod is made up of plastic because plastic is a
  1. Good conductor of heat
  2. Good insulator of heat
  3. Bad insulator of heat
  4. Good conductor of electricity
If specific latent heat of fusion of ice is 340 kJ ⁄ kg, heat required to melt ice of 100 g would be
  1. 34 J
  2. 3400 J
  3. 34000 J
  4. 34 MJ
Friction and resistance cause energy loss in form of
  1. Electrical energy
  2. Potential Energy
  3. Thermal energy
  4. Kinetic energy
 Speed that you check for a moment on speed-o-meter is termed as
  1. Instantaneous speed
  2. Average speed
  3. Uniform speed
  4. Variable speed
Boiling point of mercury is equal to 630 K. This temperature in Celsius is equal to
  1. 357 °C
  2. 630 °C
  3. 903 °C
  4. None of above
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