Question

A given object (initially at a temperature θ₀) is being heated by a ‘heat source’ that supplies it heat at a constant rate. The graph, showing the variation of temperature of the object, with time, would then be the graph labelled as graph

Answer 1

Correct answer is (2)

Let the temperature of the object (mass = m; specific heat capacity = s), rise by an amount Δθ when it receives an amount of heat ΔH . We then have

∴ The graph of θ, against t, is a straight line with a slope k and an intercept (on the θ-axis) of θ₀ .