A uniform beam of length 60cm weighs 10N. Its centre of gravity (the point where its weight can be assumed to act) is at its centre. A weight of 800N…

Two variables are connected by the relation: A∝ 1/B2 B is increased by 40%. Describe the change in A in percentage terms Answer: 9) C Increase by 40% = 140%…

The length of a person’s eyelashes is controlled by a single gene. The diagram shows the inheritance of this feature in a family. Which individual, A, B, C, D, or…

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…