A glass stopper stuck in the neck of a bottle can be removed by pouring hot water on the neck of the bottle.
A cement floor is laid in small pieces with gaps in between.
Explain the following:
The telephone wires break in winter.
The gaps are left between the successive rails on a railway track.
Write true or false
Telephone wires are kept tight between the two poles in winter.
Fill in the blank
Iron expands ............ than copper.
select the correct alternative
Two rods A and B of the same metal, but of length 1 m and 2 m respectively, are heated from 0°C to 100°C. Then