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Very short answer·Routine exam skill (2/5)·No calculator

Difficulty guide

The label describes the problem, not your ability.

1/5 - Foundational

Warm-up setup; checks one basic idea.

2/5 - Routine exam skill

Normal syllabus skill; usually one main rule or interpretation.

3/5 - Standard multi-step

Exam-style problem with multiple steps or a common trap.

4/5 - Hard exam skill

High-end exam problem; combines methods carefully.

5/5 - Challenge

Stretch problem beyond normal exam pressure.

Question

A 0.20 kg0.20\text{ kg} metal piece at 80∘C80^\circ\text{C} is mixed with 0.30 kg0.30\text{ kg} of the same metal at 20∘C20^\circ\text{C} in an insulated vessel. Find the final temperature.
Total: 1 mark

(a) Calculate the final temperature. (1 mark)

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cbse-physics-11.u7.t7-5.vsaq.001

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