Two rods of the same material and same mass have different lengths. When they are heated :

Through same rise in temperature, longer rod expands more.

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Through same rise in temperature, shorter rod expands more.

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If same quantity of heat is supplied, longer rod expands more.

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If same quantity of heat is supplied, shorter rod expands more.

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Solution

The correct options are
A Through same rise in temperature, longer rod expands more.
C If same quantity of heat is supplied, longer rod expands more.
Given: same material=>same $α$
different length=> $l_{1}$ & $l_{2}$
and let $l_{1} > l_{2}$
same $Δ t$
formula & concept:
$Δ l = l_{0} α (Δ t)$
$Δ l =$ change m length
$l_{0} =$ metal length
$Δ t =$ change in temp.
Ans)
Since $l_{1} > l_{2}$
$Δ l_{1} > Δ l_{2}$ .

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