Main source of heating energy is……………
a) Sun
b) Coal
c) Gas
d) Oil
A very good conductors of heat contains……
a) Liquids
b) Metals
c) Non-metals
d) Gases
Railway tracks have gaps between them to deal with expansion………
a) Hot days
b) Cold days
c) Winter
d) Snow fall
Heat loss may help matter to…………………
a) Expand
b) Contract
c) Spread
d) Stable
A joint which is made between adjoining rails to expand without bending is called
a) Rail joint
b) Sliding joint
c) Expansion joint
d) none of these
In melting of ice cube heat gain……...............
a) Melts ice
b) Increase temperature
c) Gain energy
d) Release energy
