Advanced Science Primary 4 Energy

Two beakers, P and Q, were filled with 200ml of water at 90°C. Beaker P was wrapped in wool, and Beaker Q was left unwrapped. Which graph correctly shows the temperature change over 30 minutes?

A Both cool down at the same rate.
B P stays at 90°C throughout.
C P cools down faster than Q.
D Q cools down faster than P.
Show Worked Solution

Worked Solution

Step 1: Wool is a poor conductor/insulator. Step [2-9]: Insulators slow down heat loss to the surroundings. Step [2-9]: Beaker Q (unwrapped) loses heat faster.

Correct answer: Q cools down faster than P.

Want more questions like this? Superholic Lab has 10,000+ MOE-aligned questions with full worked solutions.

Start Free Trial — 7 Days Free