Question Library

(a) State the principle of operation of fibre optics. (b) State two applications of fibre optics in medicine.

Which of the following waves is not mechanical?

Which of the following cases cannot produce total internal reflection? A light ray travelling from

In which of the following media is the speed of sound the least?

When ultraviolet light is incident on certain metallic p articles are emitted. These particles are called

In the diagram above, the time taken to trace a wave between P and Q is?

You are provided with a converging lens and holder, a screen, a ray box containing an illuminated object pin, and a meter rule.(See illustration above) i. Place the lens in its holder such that it is facing a distant object seen through a well-lit laboratory window. Move the screen to and fro until a sharp image of the distant object is formed on it. Measure the distance, \(f_0\), between the screen and the lens. ii. Clamp the meter rule securely to the table. Place the illuminated object pin at the end R of the meter rule. iii. Place the lens at a position P such that X = RP = 20cm. iv. Move the screen to a position Q to receive a sharp image of the object. Measure the distance Y = PQ. v. Evaluate Z = (X+Y) vi. Repeat the procedure for five other values of x = 25cm. 3Ocm, 35cm, 40cm and 45cm. In each case, record X,Y and evaluate Z. vii. Tabulate the results. viii. Plot a graph with Z on the vertical axis and X on the horizontal axis. Draw a smooth curve through the points. ix. Determine from your graph the minimum value of Z=\(Z_0\) and its corresponding distance x. Evaluate W = ½ (\(\frac{Z_0}{4} + \frac{X_0}{2}\)) xi. State two precautions taken to ensure accurate results. (b) i. Draw a ray diagram to show how a Convex lens forms an image of magnification less than one. ii. Name two pairs of features in the human eye and a lens camera that performs similar functions.

Which of the following does NOT describe the Image formed by a plane minor?

A narrow beam of white light can be split up into different Colours by a glass prism. The correct explanation is that

Which of the following may be used to explain a mirage? I. Layers of air near the road surface have varying refractive indices in hot weather II. Road surfaces sometimes becomes invisible in hot weather III. Light from the sky can be refracted upwards after coming close to the road surface.

Convex mirrors are used as driving mirrors because images formed are

Musical instruments playing the same note can be distinguished from one another owing to the difference in their

An object is placed 20cm from a concave mirror of focal length 10cm. The linear magnification of the image produced is?

Which of the following concepts is not an evidence of the particles nature of matter?

A man hears his echo from a nearby hill 2s after he shouted. If the frequency of his voice is 260Hz and the wavelength is 1.29m, how far away is the hill?