A block of wood is floating on water at $0^{\circ} C$ with volume $V_0$ above water. When the temperature of water increases from $0$ to $10^{\circ} C$, the change in the volume of the block that is above water is best described schematically by the graph.

  • [KVPY 2018]
  • A
    210701-a
  • B
    210701-b
  • C
    210701-c
  • D
    210701-d

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A student records the initial length $l$, change in temperature $\Delta T$ and change in length $\Delta l$ of a rod as follows :

S.No. $l(m)$ $\Delta T{(^o}C)$ $\Delta l(m)$
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$(2)$ $1$ $10$ $4\times 10^{-4}$
$(3)$ $2$ $20$ $2\times 10^{-4}$
$(4)$ $3$ $10$ $6\times 10^{-4}$

If the first observation is correct, what can you say about observations  $2,\,3$ and $4$.

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When a bimetallic strip is heated, it

  • [AIPMT 1990]

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