1.

If a substance is heated or cooled, the linear expansion occurs along the axis is

Answer»

X or- X
Y or- Y
both (a) and (b)
(a) or (b)

Solution :When substance is heated its EXPANSION is positive i.e., can be taken along EITHER +X or + Y direction. But when substance is cooled its either length, or area or VOLUME decreases i.e. with respect expansion it is OPPOSITE direction i.e. either-X or -Y direction respectively,


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