DP Physics (first assessment 2025)

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Question 22N.1A.SL.TZ0.8

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Date November 2022 Marks available [Maximum mark: 1] Reference code 22N.1A.SL.TZ0.8
Level SL Paper 1A Time zone TZ0
Command term Question number 8 Adapted from N/A
8.
[Maximum mark: 1]
22N.1A.SL.TZ0.8

A block of glass of mass 5 kg and temperature 30°C is brought into contact with a block of asphalt of mass 20 kg and temperature 75°C. The specific heat capacity of asphalt is twice that of glass. No energy is transferred to the surroundings. What is the final temperature of both blocks?


A.  35°C

B.  45°C

C.  60°C

D.  70°C

[1]

Markscheme

D

Examiners report

A challenging question, with incorrect alternatives B and C both picked more often than the correct D. By combining the effect of mass and specific heat capacity of both materials, the change of temperature of the glass block is 8× greater than that of the asphalt. Therefore, the difference between the initial temperatures has to be divided into 9 equal parts and the final temperature is one such part below the initial temperature of the asphalt.

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