During metabolism, two molecules of pyruvic acid, C3H4O3, are formed from one moleculeof glucose, C6H12O6. Answer: 7) A You will realise that the number of hydrogen atoms do not add…

Using the formula:z = xy^2 Answer: 6) C z = xy² y² = 1.2 x 10¹³         3 x 10⁻⁶ 1.2 x 10¹³ = 3 x 10⁻⁶ (y²) y²…

Smoking cigarettes can lead to emphysema. This occurs because. Answer: 5) A Emphysema is a condition in which lungs and air sacs are damaged, causing breathlessness. Breathlessness is caused by shortage…

Four 1000Ω resistors are connected as shown in the following circuit. Two of the resistors are changed to 900Ω. Changing which pair of resistors would make a current flow in…

One type of fission of 23892 U gives 9538 Sr and 13954 Xe as the main products.What else would be given off in the fission reaction? Answer: 3) D We…

You are told that three different gas jars contain carbon dioxide, hydrogen and oxygenrespectively.Which single method of testing for gases will enable you to identify all three gases? Answer: 2)…

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…