Question

D. Tick () the most appropriate answer
1. The increase in length of a solid when
heated is called :
(a) thermal expansion
(b) linear expansion
(c) superficial expansion
(d) cubical expansion
2. The increase in volume of a substance
when heated, is called :
(a) thermal expansion
(b) linear expansion
(c) superficial expansion
(d) cubical expansion
3. Small gaps are left between railway lines
because :
(a) rails of very long length are not
available
(b) expansion of rails during summer
(c) contraction of rails during summer
(d) both (b) and (c)
4. The bimetallic strip made from brass and
iron bends when heated. When it's bent
the shape is :
(a) brass on the outer side
(b) iron on the inner side
(c) iron on the outer side
(d) both (a) and (b)
5. Which of the following expand(s) in volume
only when heated?
(a) Solid
(b) Liquid
(c) Gas
(d) Both (b) and (c)​

Answer 1

Answer:

When a substance is heated, its constituent particles begin moving more, thus maintaining a greater average separation with their neighboring particles. The degree of expansion divided by the change in temperature is called the material's coefficient of thermal expansion; it generally varies with temperature.

Explanation:

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