A pulse of frequency 100kHz is emitted from an ultrasound scanner, and is reflected from a fetus 10cm below the transmitter placed on the mother’s abdomen. The speed of sound…

Rearrange the following equation to give x in terms of y. Answer: 13) A y = ⎡x² + 2ax⎤½       ⎣     b       ⎦ y²…

Which row of the table shows what occurs in the eye when you watch a bird flying away from you? Answer: 12) B Don’t worry if you do not know…

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…