Free Cambridge International AS & A Levels Exam Questions and Answers
Cambridge International AS & A Levels is a Cambridge certification exam. This page has free practice questions for it with answers and explanations, set out the way the real exam asks them, plus a timed practice test that scores you against the pass mark.
Candidates comparing Cambridge International AS & A Levels exam dumps, ExamTopics and other practice tests use this page for the answers and explanations behind each question. Download the free PDF, then sit the timed exam simulation before booking with Cambridge.
Last updated: October 20, 2026
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Question #1
Biology 9700, Paper 1. Bacteria were grown for many generations in a medium containing only 15N, so all of their DNA was heavy. They were transferred to a medium containing only 14N and allowed to replicate their DNA exactly twice. Assuming DNA replication is semi-conservative, which statement describes the DNA molecules after the second replication?
Correct answer: D
Explanation
After one round every molecule is hybrid (15N/14N). In the second round each hybrid separates into one 15N strand, which pairs with new 14N, and one 14N strand, which pairs with new 14N. This gives half hybrid molecules and half with two 14N strands. Two 15N strands never reappear because the original strands are not rejoined.
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Question #2
Physics 9702, Paper 1. A cell of e.m.f. 9.0 V and negligible internal resistance is connected across two resistors in series, of resistance 3.0 kΩ and 6.0 kΩ. Without a voltmeter, the potential difference across the 6.0 kΩ resistor is 6.0 V. A voltmeter of resistance 6.0 kΩ is now connected in parallel with the 6.0 kΩ resistor. What is the reading on the voltmeter?
Correct answer: C
Explanation
The 6.0 kΩ resistor in parallel with the 6.0 kΩ voltmeter gives 3.0 kΩ. The total resistance is 3.0 + 3.0 = 6.0 kΩ, so the p.d. across the parallel pair is 9.0 x 3.0/6.0 = 4.5 V. Reading 6.0 V ignores the loading effect of the voltmeter.
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Question #3
Biology 9700, Paper 1. A diploid cell from a plant has 24 chromosomes. How many chromatids are present in one cell of this plant at metaphase of mitosis?
Correct answer: D
Explanation
DNA has replicated before mitosis, so each of the 24 chromosomes consists of two sister chromatids. This gives 24 x 2 = 48 chromatids. The number 24 is the chromosome count, which is the usual slip.
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Question #4
Physics 9702, Paper 1. Which one of the following is an SI base unit?
Correct answer: D
Explanation
The SI base units include the metre, kilogram, second, ampere, kelvin and mole. The newton, volt and pascal are derived units, for example the newton is kg m s^-2.
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Question #5
Biology 9700, Paper 1. A photomicrograph of a cell has a magnification of ×400. The length of the cell in the photomicrograph is 3.6 mm. What is the actual length of the cell?
Correct answer: A
Explanation
Actual size = image size ÷ magnification = 3.6 mm ÷ 400 = 0.009 mm. Multiplying by 1000 to convert millimetres to micrometres gives 9 µm. The usual error is a slip of a factor of 10 in the unit conversion.
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Question #6
Chemistry 9701, Paper 1. 2.40 g of magnesium (Ar = 24.0) reacts completely with excess dilute hydrochloric acid. Mg + 2HCl → MgCl2 + H2 What is the volume of hydrogen produced, measured at room temperature and pressure? (The molar volume of a gas at room temperature and pressure is 24.0 dm3 mol^-1.)
Correct answer: B
Explanation
Moles of Mg = 2.40 ÷ 24.0 = 0.100 mol. The equation shows a 1:1 ratio of Mg to H2, so 0.100 mol of H2 forms. Volume = 0.100 × 24.0 = 2.40 dm3. Doubling the volume comes from wrongly using the 2 in front of HCl.
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Question #7
Biology 9700, Paper 1. In a sample of double-stranded DNA, 28% of the bases are adenine. What is the percentage of the bases that are adenine or thymine?
Correct answer: D
Explanation
Complementary base pairing means thymine equals adenine, so thymine is also 28%. Adenine plus thymine is 28 + 28 = 56%. The remaining 44% is split equally between guanine and cytosine, 22% each.
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Question #8
Physics 9702, Paper 1. A box is pulled 5.0 m along a horizontal floor by a constant force of 40 N. The force acts at 60° above the horizontal. What is the work done by the force on the box?
Correct answer: B
Explanation
Work done = F s cos θ, using the component of force along the direction of motion. W = 40 × 5.0 × cos 60° = 100 J. Using sin 60° gives about 170 J, which is the vertical component and not the one that does work along the floor.
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Question #9
Chemistry 9701, Paper 1. Ammonia is made in the Haber process. N2(g) + 3H2(g) ⇌ 2NH3(g) ΔH = -92 kJ mol^-1 Which change increases the equilibrium yield of ammonia?
Correct answer: C
Explanation
Removing ammonia lowers its concentration, so the equilibrium position moves right to replace it, raising the yield. A catalyst only increases rate. A higher temperature favours the endothermic (reverse) direction, and lower pressure favours the side with more gas molecules, which is the reactants.
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Question #10
Physics 9702, Paper 1. A stretched string of length 1.2 m is fixed at both ends. Waves travel along the string at a speed of 60 m s^-1. What is the frequency of the fundamental mode of vibration of the string?
Correct answer: A
Explanation
In the fundamental mode, the string length is half a wavelength, so λ = 2 × 1.2 = 2.4 m. Using f = v ÷ λ gives f = 60 ÷ 2.4 = 25 Hz. Taking λ equal to the string length gives 50 Hz, which is the second harmonic.
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FAQ
Learn More: https://www.cambridgeenglish.org/exams-and-tests/
- Q1: What is the Cambridge International AS & A Levels exam?
- A: Cambridge International AS & A Levels is a professional examination.
- Q2: Are there practice questions for Cambridge International AS & A Levels?
- A: Yes. The first ten are free to read with their answers and no account is needed; the rest of the bank and the practice test come with access to the exam.
- Q3: How should I prepare for Cambridge International AS & A Levels?
- A: Start from the official Cambridge exam objectives, which define what is actually tested, and practise against questions written to them rather than to a syllabus someone has guessed at.
- Q4: Where do I register for Cambridge International AS & A Levels?
- A: Registration is handled by the awarding body — see https://www.cambridgeenglish.org/exams-and-tests/ for the current fee, the testing options and the booking process.