The diagram shows three similar right-angled triangles. What is the area of the largest triangle? Answer: 20) B Let hypotenuse of smaller triangle = HLet hypotenuse of larger triangle = ALet hypotenuse of largest triangle =…
The diagram below shows three identical resistors and a battery that supplies a constant 12 V. With the switch open, as shown, the current in resistor Y is 20 mA.…
The total surface area of a cylinder is numerically the same as its volume. The radius of the cylinder is r cm, the height is h cm. Express h in…
Five identical resistors are connected to a cell as in the diagram. The potential differences across R1 , R2 and R3 are V1, V2 and V3 respectively. What is the…
The table shows the concentrations, in arbitrary units, of four substances. These substances are present in each of two animal cells, K and L, whose cell membranes are in contact.…
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)…