UK A-Level Revision Practice Test — Questions and Answers

Question 1: What is the relationship between energy and mass in Einstein's special relativity?

E = mc
E = mv²
E = m/c²
E = mc² (Correct answer)

Correct answer: E = mc²

Einstein's famous equation E = mc² shows that mass and energy are equivalent and interconvertible. A small mass corresponds to an enormous amount of energy (c ≈ 3 × 10⁸ m/s, so c² ≈ 9 × 10¹⁶). This underpins nuclear energy and particle physics.

Question 2: The Demographic Transition Model (DTM) describes which of the following?

How urbanisation affects birth rates over time
How birth and death rates change as a country develops economically (Correct answer)
The movement of people from rural to urban areas
Changes in average household size across generations

Correct answer: How birth and death rates change as a country develops economically

The DTM shows how both birth rates and death rates decline as countries undergo economic and social development, moving through four or five stages.

Question 3: What is the role of ATP in cellular processes?

The enzyme that catalyses glycolysis
The structural component of cell membranes
The universal energy currency that transfers energy between exergonic and endergonic reactions in cells (Correct answer)
Long-term energy storage only

Correct answer: The universal energy currency that transfers energy between exergonic and endergonic reactions in cells

ATP (adenosine triphosphate) is the universal cellular energy currency. It is synthesised in respiration (exergonic) and hydrolysed to ADP + Pi (endergonic reactions), releasing energy for cellular work such as active transport, muscle contraction, and synthesis.

Question 4: During meiosis, when does crossing over occur?

Metaphase I
Anaphase II
Telophase I
Prophase I (Correct answer)

Correct answer: Prophase I

Crossing over occurs during prophase I when homologous chromosomes pair up (synapsis) and form bivalents. Sections of non-sister chromatids exchange, producing recombinant chromosomes and increasing genetic variation.

Question 5: What is the fluid mosaic model of the cell membrane?

A model showing a rigid, impermeable barrier
A model describing the cytoskeleton
A model describing the membrane as a phospholipid bilayer with mobile proteins embedded in it (Correct answer)
A model for the nuclear envelope only

Correct answer: A model describing the membrane as a phospholipid bilayer with mobile proteins embedded in it

The fluid mosaic model (Singer & Nicolson, 1972) describes the plasma membrane as a phospholipid bilayer in which proteins are embedded and can move laterally (fluid), forming a mosaic pattern. Cholesterol adds stability.

Question 6: What is an action potential?

The refractory period of a nerve fibre
A chemical signal at a synapse
A temporary reversal of the electrical charge across a neurone's membrane, allowing a nerve impulse to travel (Correct answer)
The resting potential of a neurone

Correct answer: A temporary reversal of the electrical charge across a neurone's membrane, allowing a nerve impulse to travel

An action potential is a rapid, all-or-nothing depolarisation of the neurone membrane. Na⁺ channels open (depolarisation → +40mV), then K⁺ channels open (repolarisation), followed by a refractory period. The threshold is approximately −55mV.

Question 7: What is the strong nuclear force?

The short-range force that holds protons and neutrons together in the nucleus, overcoming electrostatic repulsion between protons (Correct answer)
The force of gravity between protons
The force between electrons
The force responsible for beta decay

Correct answer: The short-range force that holds protons and neutrons together in the nucleus, overcoming electrostatic repulsion between protons

The strong nuclear force (strong interaction) acts between quarks and holds nucleons (protons and neutrons) together in the nucleus. It is very short-range (< ~3 fm) but extremely powerful, overcoming the electrostatic repulsion between protons.

Question 8: What is the 'multiplier effect' in economic geography?

The increase in population due to rural-to-urban migration
The spreading of industrial activity from city centres to suburbs
A method for calculating GDP growth rates
The way in which one economic investment generates further economic activity and jobs (Correct answer)

Correct answer: The way in which one economic investment generates further economic activity and jobs

The multiplier effect describes how an initial investment or job creation generates additional economic activity as money circulates through the local economy, creating further employment and income.

Question 9: Which coastal landform is produced when a headland is eroded on both sides until the two caves meet, forming a tunnel through the rock?

Stump
Wave-cut platform
Stack
Arch (Correct answer)

Correct answer: Arch

A natural arch forms when caves on either side of a headland are eroded until they break through, leaving a tunnel or archway of rock.

Question 10: What is the difference between mRNA, tRNA, and rRNA?

mRNA carries genetic code from DNA to ribosomes; tRNA brings specific amino acids; rRNA is a structural component of ribosomes (Correct answer)
They are all the same type of RNA
rRNA carries genetic information
tRNA is made in the nucleus; mRNA is made in the ribosome

Correct answer: mRNA carries genetic code from DNA to ribosomes; tRNA brings specific amino acids; rRNA is a structural component of ribosomes

mRNA (messenger RNA) carries the genetic code from DNA to the ribosome. tRNA (transfer RNA) has an anticodon and carries a specific amino acid to the ribosome during translation. rRNA (ribosomal RNA) forms part of the ribosome structure.

Question 11: Solve: 2sin²θ − sinθ − 1 = 0 for 0° ≤ θ ≤ 360°

θ = 90°, 210°, 330° (Correct answer)
θ = 30°, 150°
θ = 30°, 150°, 270°
θ = 60°, 120°, 270°

Correct answer: θ = 90°, 210°, 330°

Let u = sinθ: 2u² − u − 1 = 0 → (2u + 1)(u − 1) = 0. So sinθ = −1/2 or sinθ = 1. sinθ = 1 → θ = 90°. sinθ = −1/2 → θ = 210°, 330°. So θ = 90°, 210°, 330°.

Question 12: What is codominance in genetics?

When one allele completely masks another
When recessive alleles skip a generation
When both alleles in a heterozygote are fully expressed, producing a phenotype distinct from either homozygote (Correct answer)
When genes are on the X chromosome

Correct answer: When both alleles in a heterozygote are fully expressed, producing a phenotype distinct from either homozygote

Codominance occurs when both alleles in a heterozygote are expressed fully and simultaneously. Neither is dominant over the other. Example: AB blood type — both Iᴬ and Iᴮ alleles are expressed equally.

Question 13: What does ∫(3x² + 2x) dx equal?

3x³ + x² + C
x³ + x² + C (Correct answer)
x³ + 2x + C
6x + 2 + C

Correct answer: x³ + x² + C

Integrate term by term: ∫3x² dx = x³ and ∫2x dx = x². Add constant C. So ∫(3x² + 2x) dx = x³ + x² + C.

Question 14: What is the 'first-past-the-post' (FPTP) electoral system?

A system used for European elections
A proportional system where seats match vote shares
A system where multiple candidates are ranked
A plurality system where the candidate with the most votes in a constituency wins, regardless of whether they have a majority (Correct answer)

Correct answer: A plurality system where the candidate with the most votes in a constituency wins, regardless of whether they have a majority

FPTP is used for UK general elections. Each constituency returns one MP — the candidate with the most votes wins (plurality, not necessarily majority). It often produces large majorities on less than half the vote and disadvantages smaller parties.

Question 15: What is the condition for two lines in 3D to be perpendicular?

The cross product equals zero
The dot product of their direction vectors equals zero (Correct answer)
Their direction vectors are parallel
They have the same y-intercept

Correct answer: The dot product of their direction vectors equals zero

Two lines with direction vectors a and b are perpendicular if a · b = 0 (dot product equals zero). The dot product a · b = |a||b|cos θ; if θ = 90°, cos 90° = 0, so a · b = 0.

Question 16: What does the de Broglie equation describe?

The energy levels in a hydrogen atom
The wave-like behaviour of matter: λ = h/mv (wavelength of a particle) (Correct answer)
The energy of photons
The speed of electrons in an orbit

Correct answer: The wave-like behaviour of matter: λ = h/mv (wavelength of a particle)

The de Broglie equation λ = h/p = h/mv links the wavelength of a particle to its momentum. It demonstrates wave-particle duality: all matter has associated wavelength. At low mass/high speed (electrons), the wavelength is measurable.

Question 17: What is photorespiration and why is it a problem for plants?

The process of respiration in the dark
An alternative name for light-dependent reactions
A wasteful process in C3 plants where RuBisCO fixes oxygen instead of CO₂, reducing photosynthetic efficiency (Correct answer)
The beneficial process of absorbing sunlight

Correct answer: A wasteful process in C3 plants where RuBisCO fixes oxygen instead of CO₂, reducing photosynthetic efficiency

Photorespiration occurs in C3 plants when RuBisCO, the main CO₂-fixing enzyme, reacts with O₂ instead of CO₂ (especially at high temperatures or low CO₂). This produces no useful sugar, wasting energy and reducing yield.

Question 18: What is the principle of superposition of waves?

Waves cannot pass through each other
When two waves meet at a point, the resultant displacement is the algebraic sum of the individual displacements (Correct answer)
Waves always cancel each other out
Superposition only applies to light waves

Correct answer: When two waves meet at a point, the resultant displacement is the algebraic sum of the individual displacements

The principle of superposition states that when two or more waves overlap, the total displacement at any point is the vector (algebraic) sum of individual displacements. This produces constructive interference (crests align) or destructive interference (crest meets trough).

Question 19: What is meant by 'urban heat island' effect?

The reduction of green space in city centres
The increased flooding risk in built-up urban environments
Higher temperatures recorded in urban areas compared to surrounding rural areas (Correct answer)
The concentration of industry on the outskirts of cities

Correct answer: Higher temperatures recorded in urban areas compared to surrounding rural areas

The urban heat island effect occurs because built surfaces absorb and retain more heat than natural landscapes, making cities measurably warmer than surrounding rural areas.

Question 20: In a food chain, approximately what percentage of energy is typically transferred from one trophic level to the next?

50%
90%
10% (Correct answer)
1%

Correct answer: 10%

Approximately 10% of energy transfers between trophic levels. The remaining ~90% is lost through respiration, heat, excretion, and egestion, limiting food chains to typically 4-5 levels.

Question 21: What is the significance of the lac operon in bacteria?

It permanently switches off gene expression
It encodes proteins for photosynthesis
It is found only in eukaryotic cells
It is an example of gene regulation where lactose-metabolising genes are switched on only when lactose is present and glucose is absent (Correct answer)

Correct answer: It is an example of gene regulation where lactose-metabolising genes are switched on only when lactose is present and glucose is absent

The lac operon (E. coli) demonstrates inducible gene regulation. In the absence of lactose, a repressor binds to the operator, blocking transcription. Lactose (as allolactose) binds the repressor, removing it and allowing transcription of lactase genes.

Question 22: What is ecological succession?

Random migration of species
The daily changes in an ecosystem
A type of nutrient cycling
The process by which communities of organisms change and develop over time in a habitat, from pioneer species to a climax community (Correct answer)

Correct answer: The process by which communities of organisms change and develop over time in a habitat, from pioneer species to a climax community

Ecological succession is the directional change in a community over time. Primary succession starts on bare substrate (e.g., rock after a glacier). Species modify the habitat, allowing new species to establish, eventually reaching a stable climax community.

Question 23: What is the role of the enzyme rubisco in the Calvin cycle?

It splits water molecules during the light-dependent stage
It reduces GP to G3P using ATP and NADPH
It regenerates RuBP from G3P molecules
It catalyses the fixation of CO₂ by combining it with ribulose bisphosphate (RuBP) (Correct answer)

Correct answer: It catalyses the fixation of CO₂ by combining it with ribulose bisphosphate (RuBP)

Rubisco (ribulose bisphosphate carboxylase/oxygenase) catalyses the carboxylation of RuBP, combining it with CO₂ to form two molecules of glycerate-3-phosphate (GP). It is the most abundant enzyme on Earth.

Question 24: In DNA replication, what is the function of DNA helicase?

Unwinding the double helix by breaking hydrogen bonds between base pairs (Correct answer)
Adding complementary nucleotides to the template strand
Joining Okazaki fragments on the lagging strand
Proofreading newly synthesised DNA for errors

Correct answer: Unwinding the double helix by breaking hydrogen bonds between base pairs

DNA helicase unwinds the double helix by breaking the hydrogen bonds between complementary base pairs, creating two single-stranded templates at the replication fork.

Question 25: Which of the following is an example of a push factor in migration?

Political persecution in the country of origin (Correct answer)
Higher wages in a destination country
Employment opportunities in an urban centre
Better healthcare facilities available abroad

Correct answer: Political persecution in the country of origin

Push factors are negative conditions at the origin that encourage people to leave, such as political persecution, conflict, or poverty.

Question 26: What is a standing wave and what conditions are needed to form one?

A wave with no frequency
A wave that travels faster than sound
A wave only found in solids
A stationary pattern formed by superposition of two identical waves travelling in opposite directions, forming nodes and antinodes (Correct answer)

Correct answer: A stationary pattern formed by superposition of two identical waves travelling in opposite directions, forming nodes and antinodes

Standing waves form when two waves of equal frequency and amplitude travel in opposite directions and superpose. They have fixed nodes (zero displacement) and antinodes (maximum displacement). They form in resonating systems like strings, pipes, and cavities.

Question 27: In George Orwell's 'Animal Farm', the pigs gradually becoming indistinguishable from humans is an example of which literary device?

Alliteration
Simile
Allegory (Correct answer)
Oxymoron

Correct answer: Allegory

Animal Farm is an allegory for the Russian Revolution and the rise of Stalinism. The pigs represent the Communist Party leaders, and their transformation into human-like figures allegorises how revolutionary leaders became indistinguishable from the oppressors they replaced.

Question 28: In the context of glacial landforms, what is an 'arête'?

A pyramidal peak formed where three or more corries meet
A broad, flat-floored valley formed by glacial erosion
A narrow, knife-edge ridge formed between two corries or glacial valleys (Correct answer)
A roche moutonnée with a steep plucked face

Correct answer: A narrow, knife-edge ridge formed between two corries or glacial valleys

An arête is a sharp, narrow ridge formed when two adjacent glaciers or corries erode the land from either side, leaving a thin rock wall between them.

Question 29: On a velocity-time graph, what does the area under the line represent?

Force
Acceleration
Speed
Displacement (Correct answer)

Correct answer: Displacement

The area under a velocity-time graph gives the displacement of the object. This is because displacement = velocity × time, which corresponds to the area calculation. Areas below the time axis represent displacement in the negative direction.

Question 30: Inter-observer reliability is best established by:

Having two or more observers independently code the same behaviour and correlating their results (Correct answer)
Asking participants to rate their own behaviour
Giving the same test to participants on two different occasions
Splitting a test into two halves and correlating the scores

Correct answer: Having two or more observers independently code the same behaviour and correlating their results

Inter-observer reliability checks whether different observers produce consistent results when coding the same behaviour. A correlation of r = 0.80 or above is generally considered acceptable. This is essential in observational studies to ensure objectivity.

UK A-Level Revision Practice Test

UK A-Level (Advanced Level) qualifications are subject-specific exams taken by students aged 16-18, assessing in-depth knowledge across sciences and humanities. This multi-subject revision practice test covers Biology, Chemistry, and Geography based on AQA exam board specifications.

Questions

35 min

Time Limit

70%

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These practice questions were written with AI tools. They are not real exam questions. Exam facts are checked against the official sources listed below. Not reviewed by a subject-matter expert. Editorial policy

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aqa.org.uk — Fees · verified Oct 2026