The movement of air in and out of the lungs can be measured using a spirometer. The graph is a trace from a spirometer Which lettered arrow represents the tidal…

The sum of the roots of a quadratic equation is 7, the product of the roots is 9. What is theequation? Answer: 27) C To solve this, we need to…

The list below describes some events that occur during nuclear division. Indicate, by shading the appropriate circles on the answer sheet, which events occur during mitosis and which occur during…

For a rigid body performing small oscillations about a fixed horizontal axis, the period of oscillations is given by. where h is the distance of the centre of mass from…

The diagram shows the leg muscles of an athlete leaving the starting blocks for a race. Which muscles contract and which relax to bring about the change from position 1…

In water, the Fe^2+ ion bonds with water to form Fe(H2O)6^2+. In haemoglobin in the blood, five of the water molecules have been displaced. In the presence of air, the…

Nuclide P decays by emission of ionising radiation to produce nuclide Q. This new nuclide then decays by further emission into nuclide R. The process is shown below, with the…

Which blood vessel will have capillaries at both ends? Answer: 21) D The Hepatic portal vein is the only blood vessel which carries nutrient rich blood from one organ to…

Which one of the following is not a measure of electrical power? (V = potential difference, I = current, Q = charge, t = time, R = resistance) Answer: 20)…

The diagram shows three sperm and three ova containing sex chromosomes X and Y (notdrawn to scale). Indicate the letters (A to F) of all the sex cells which are…