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PIMSO 2025 - Science - Primary 6 - National Round Question 15

PIMSO Science · PIMSO 2025 - Science - Primary 6 - National Round

Question 15

Samson wanted to find out the electrical conductivity of 3 rods, P, Q and R, made of different materials. He inserted the rods into the circuit at positions A, B, and C as shown below. The table below shows the results collected at the end of the experiment.
At A, B, C: P, Q, R → bulbs 1, 2, 3: yes, yes, yes.
At A, B, C: Q, R, P → bulbs 1, 2, 3: no, no, no.
At A, B, C: R, P, Q → bulbs 1, 2, 3: yes, no, yes.
Based on the data above, which one of the following conclusions is correct?

Question illustration
  1. Only rod R is a non-conductor of electricity.
  2. Only rods Q and R are non-conductors electricity.
  3. Only rod P is a non-conductor of electricity.
  4. Rods P and Q are better conductors of electricity than rod R.