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ICSE Class 10 Physics Question 1 of 27

Solved Sample Paper 1 — Question 1

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Question 1(i)

A certain mass of solid substance is heated for a period of 50 min. Its heating curve is shown below :

A certain mass of solid substance is heated for a period of 50 min. Its heating curve is shown. From the graph, which one of the statement is correct? Physics Sample Paper Solved ICSE Class 10.

From the graph, which one of the following statement is correct?

  1. The boiling point of the given substance is 40°C.
  2. The specific latent heat of fusion of substance is the same as the specific latent heat of vaporisation.
  3. The substance has a higher specific heat capacity in solid state than that in liquid state.
  4. The substance has a lower specific heat capacity in solid state than that in liquid state.
Answer

The substance has a higher specific heat capacity in solid state than that in liquid state

Reason — From graph, 40°C is the melting point of the substance. It takes 10 mins for melting for temperature change of 20°C (i.e.,40°-20°) and takes 10 mins for boiling for temperature change of 40°C (i.e., 80°-40°).

Hence, the latent heat of fusion is less than the latent heat of vapourisation

From relation,

Q = m x c x △T

C ∝ 1ΔT\dfrac{1}{\Delta\text{T}}

So, from graph, the specific heat capacity in solid state is greater than that in liquid state.