Cambridge Past Paper Questions
Browse 23,045questions from 25 years of O-Level & A-Level exams. Click any question to practice.
Hydrogen iodide, HI, is a colourless gas at room temperature.
(a) Table 1 gives physical data for some of the Period 3 elements. [Figure 2.1]
Compound T is an isomer of C₆H₁₂. [Figure 3.1 shows the structure of T, 2,3-dimethylbut-2-ene]
The reaction scheme shows some reactions of calcium. [Figure: Reaction scheme showing Ca(s) to Ca(NO₃)₂(aq) via HNO₃ (reaction 1), then to Ca(OH)₂(...
Compound B is a liquid with a fruity smell. [Structure of B: an ethyl ester of bromoethanoic acid, CH₃CHBrCOOCH₂CH₃] The reaction scheme shows how ...
In this experiment you will titrate a solution of the hydroxide of a Group 1 element, Z, with sulfuric acid. The equation for the reaction is shown...
Group 1 metal carbonates have the formula M₂CO₃. The identity of the metal ion, M⁺, may be determined by a gravimetric method. The metal carbonate ...
The identity of a Group 1 metal carbonate may also be found by a titration method. M⁺ in this question may or may not be the same cation as that in...
When dilute sulfuric acid is electrolysed, water is split into hydrogen and oxygen. 2H2O(l) → 2H2(g) + O2(g) A current of xA is passed through the ...
Solution Y is hydrochloric acid, HCl(aq). Solution Z is aqueous 4-chlorobutanoic acid, Cl(CH2)3CO2H(aq). The pKa of Cl(CH2)3CO2H(aq) is 4.52. The p...
Some data relating to calcium and oxygen are listed. Select relevant data from this list for your answers to parts (c), (d) and (e). [Table of proc...
A student has drawn a cell structure as seen using a light microscope. The magnification of the drawing is ×600. The length of the structure on the...
The electron micrograph shows part of a eukaryotic cell. Which of the labelled organelles is a site of protein synthesis? [Figure 2.1]
Inside a cell, a damaged mitochondrion can be surrounded and enclosed by a membrane to form a vesicle. What happens after the fusion of a lysosome ...
Which units are the most appropriate to record the diameter of a lymphocyte and a red blood cell? [Figure 4.1]
Which structures will be present in a cell that causes cholera? 1 circular DNA 2 naked DNA 3 70S ribosomes
What may take place during a hydrolysis reaction? 1 a molecule of water is produced 2 a glycosidic bond is broken 3 a sucrose molecule is split int...
The table shows some information about four carbohydrate polymers. Which two polymers form starch? [Figure 7.1]
Which molecule in the key is sucrose? [Figure 8.1]
Which statements about triglycerides and phospholipids are correct? 1 Triglycerides and phospholipids both have a hydrophobic region. 2 Triglycerid...
When proteins are mixed with some organic solvents, hydrophobic interactions and hydrogen bonding are changed in the protein molecules. Which level...
The rate of enzyme-catalysed reactions in human cells is regulated. What may be involved in such regulation? 1 a change in enzyme concentration 2 a...
The graphs show the effects of temperature and pH on enzyme activity. Which statement is a correct explanation of the enzyme activity? [Figure 12.1]
Which statement correctly describes the action of competitive enzyme inhibitors?
Which row correctly links molecules in the cell surface membrane with their roles? [Figure 14.1]
Antimycin is a chemical that inhibits the function of mitochondria. Which methods of transport across the cell surface membrane would be inhibited ...
Which statements about the cell cycle are correct? 1 The cell cycle consists of both interphase and mitosis. 2 DNA replication takes place in inter...
The diagram shows cells in different stages of the cell cycle. Which is the last stage before cytokinesis? [Figure 17.1]
How many of the listed structures typically contain genetic material that has telomeres? • bacterial cell • chloroplast • mitochondrion • nucleus
What does the enzyme DNA polymerase synthesise in a cell?
21.2% of the bases in a molecule of DNA are cytosine. What percentage would be adenine?
One gene provides the code for the production of which type of molecule?
The table shows the mode of action of two antibacterial drugs that can affect the synthesis of proteins. If bacteria are treated with both drugs, w...
The diagrams show transverse sections of parts of a plant. In the transverse sections, which tissues transport sucrose? [Figure 23.1]
Which statement describes movement through a plant in the apoplast pathway?
Which changes to the water potential and the volume of liquid in the phloem occur when sucrose is moved from the phloem sieve tube to an actively d...
The diagram shows the results of an experiment using leaves with the same surface area from two different species of plant. Each leaf was left on a...
Which evidence supports the cohesion-tension theory for the movement of water in flowering plants? 1 When the rate of transpiration of a tree is at...
Cardiac muscle is made up of many fibres that form the walls of the chambers of the heart. When the heart contracts, these fibres shorten in length...
Which reactions take place at a higher rate in a capillary in an alveolus than in a capillary in active muscle? 1 carbon dioxide + water → carbonic...
The diagram shows the effect of three different concentrations of carbon dioxide on the oxygen dissociation curve for human haemoglobin. What effec...
The graph shows the changes that take place in the volume of the left ventricle during one cardiac cycle. Which point on the graph represents the s...
The following tissues carry an electrical impulse during the cardiac cycle. 1 atrioventricular node 2 muscle wall of atria 3 Purkyne tissue 4 sinoa...
Some of the effects of smoking are listed. 1 It causes coughing. 2 It increases blood pressure. 3 It decreases the transport of oxygen. 4 It increa...
The photomicrograph shows a section through part of a bronchus wall. What is the function of the tissue labelled X? [Figure 34.1]
Which of the following increase the risk of contracting TB? 1 drinking unpasteurised milk 2 eating shellfish which have fed on raw sewage 3 living ...
One control method to reduce the spread of malaria is to use an insecticide. It can be used to treat mosquito nets. Another control method is to co...
What is not an example of antibiotic action?
Which row correctly identifies the roles of B-lymphocytes and T-lymphocytes? [Figure 38.1]
A person's blood group is determined by antigens present on the red blood cells. The table shows the antigens and antibodies in the blood of people...