Singapore G3 Science Physics and Chemistry free practice questions with answers
Read question 1 and its full worked answer from paper 1 of our 20-paper Singapore G3 Science Physics and Chemistry set, then download the 5-page PDF. These are original practice questions, not official past papers. Page updated 3 November 2026.
Convert 3.2 mg to kg. [1 mark]
A 3.2 × 10−⁶ kg
B 3.2 × 10−⁷ kg
C 3.2 × 10⁶ kg
D 3.2 × 10−⁹ kg
Correct answer: A — 3.2 × 10−⁶ kg
- 1 mg = 10−⁶ kg.
- 3.2 mg = 3.2 × 10−⁶ kg.
- Why the other options are wrong:
- B (3.2 × 10−⁷ kg): a factor of ten is too many
- C (3.2 × 10⁶ kg): the power of ten has the wrong sign
- D (3.2 × 10−⁹ kg): the wrong prefix size was used
Prefixes: n 10−⁹, µ 10−⁶, m 10−³, c 10−², k 10³, M 10⁶, G 10⁹: replace the prefix by its power of ten.
Your sample is downloading. Liked it? Singapore G3 Science Physics and Chemistry Paper 1 is the full paper: Paper 1 (40 multiple-choice questions, 40 marks) and a 65-mark structured paper for each science, each with a 55-mark Section A and a Section B choice of one from two; no practical Paper 5, with a worked solution for every question.
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Questions about this sample
What is in the Singapore G3 Science Physics and Chemistry free sample?
The first 3 questions from paper 1 of the set, in the real exam layout, followed by the step-by-step worked answers. It is a 5-page PDF; this page shows question 1 with its answer.
How many full Singapore G3 Science Physics and Chemistry papers are there?
20 original papers for Singapore secondary students preparing for SEC G3 Science (Physics, Chemistry) (K326) from 2027. Each is Paper 1 (40 multiple-choice questions, 40 marks) and a 65-mark structured paper for each science, each with a 55-mark Section A and a Section B choice of one from two; no practical Paper 5, with a worked solution for every question. Papers start at A$11.99 and download instantly as a PDF.
Are these official past papers?
No. The sample is taken from our own original practice paper and is not an official past paper or affiliated with any exam authority.