The table below gives some information about the number and biomass of organisms in thefood chain:rose bush → aphid → ladybirdorganism number oforganismsbiomass at eachlevel(arbitrary units)rose bush 1 800aphid 4000…
PQRS is a kite. Points P, Q and R are plotted on the diagram.P is the point (0, 1) and R is the point (4, 5).angle PQR = 90°The point…
A diver of mass 45 kg jumps from a diving board and reaches a maximum height of 10 m above the surface of the water in a swimming pool. Assume…
Propene is an alkene. The structural formula of propene is shown. A polymer can be made from propene. What is the correct structural formula of this polymer? Answer: 18) D…
Six test tubes were set up. Two different solutions were added to each test tube as shown in the table.The temperature, pH and all concentrations were optimal.Which three mixtures would…
The graphs of the following functions are drawn:y= 2x-1 y= 1-x2 y= (1-x)2 y=2-xWhich two graphs do not intersect? Answer: 16) E The best way to solve this question is…
Thorium-232 ( Th) is an unstable nuclide that decays through a sequence of radioactive emissions to form a stable nuclide of lead. All of the emissions during this sequence are…
Four metals, labelled R, T, X and Z, have the following characteristics: R fizzes when added to dilute hydrochloric acid. T is precipitated when R reacts with an aqueous solution…
Several processes can change the proportion of gases in the atmosphere by adding or removing carbon dioxide or oxygen. Which row is correct? Answer: 13) D This is fairly simple.…
Triangle PQR is equilateral with sides of length 10 cm. P, Q, and R are points on the circumference of a circle with centre O. Which one of the following…