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Question
Choose the correct statement(s) from the following:
1. If the coefficient of linear expansion of copper is 1.7×10−5 ∘C−1, then its coefficient of superficial expansion is 3.4×10−5∘C−1.
2. When a body is heated, its length, breadth and height increases in superficial expansion.
Choose the correct statement(s) from the following:
1. If the coefficient of linear expansion of copper is 1.7×10−5 ∘C−1, then its coefficient of superficial expansion is 3.4×10−5∘C−1.
2. When a body is heated, its length, breadth and height increases in superficial expansion.
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Solution
The correct option is B Only statement 1 is correct.
Coefficient of linear expansion of copper α=1.7×10−5 ∘C−1.
Coefficient of superficial expansion of copper β=2×1.7×10−5 ∘C−1=3.4×10−5 ∘C−1.
Therefore statement 1 is correct. When a body is heated, only its length and breadth will increase in a superficial expansion. In volumetric expansion, when the body is heated it expands in all directions i.e. its length, breadth and height increases. Therefore statement 2 is incorrect.
Coefficient of linear expansion of copper α=1.7×10−5 ∘C−1.
Coefficient of superficial expansion of copper β=2×1.7×10−5 ∘C−1=3.4×10−5 ∘C−1.
Therefore statement 1 is correct. When a body is heated, only its length and breadth will increase in a superficial expansion. In volumetric expansion, when the body is heated it expands in all directions i.e. its length, breadth and height increases. Therefore statement 2 is incorrect.
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