Question Library

A potential difference of 12V is applied across the ends of a 6\(\Omega\) resistor for 10 minutes. Determine the quantity of heat generated

Which of the following particles are termed nucleons in a neutral atom?

Which of the following statements about the use of radioisotopes is not correct? They are used to

You are provided with a constantan wire, a2 \(\Omega\)standard resistor, an accumulator E, an ammeter A, a key K, and other necessary apparatus. Measure and record the emf of the accumulator provided Connect a circuit as shown in the diagram above. Close the key, read and record the ammeter reading \(l_o\) when the crocodile clip is not in contact with the Constantan wire. Open the key with the clip making contact with the wire, when d=90cm, close the key. Read and record the ammeter reading l. Evaluate d\(^{_1}\) Repeat the procedure for four other values of d=80, 70, 60, and 50 cm In each case, read and record the ammeter reading and evaluatre d\(^{_1}\). Tabulate your readings. Plot a graph with I on the vertical axis and d\(^{_1}\) on the horizontal aXIS. Determine the slope, S of the graph and its intercept, c, on the vertical axis. Evaluate k = \(\frac{c}{s}\) Using your graph, determine the current I when d=55cm. State two precautions taken to obtain accurate results. (b)i. Explain what is meant by the potential difference between two points in an electric circuit. ii. State two factors on which the resistance of a wire depends.

Name one use of 'LASER' in each of the following areas: (a) communication; (b) medicine; (c) security

The accelerating potential in a cathode ray oscilloscope is 2.5 kV. Calculate the maximum speed of the accelerated electrons. [ e = 1.6 x 10\(^{-19}\) C; Me = 9.1 x 10\(^{-31}\) kg]

(a) what is Brownian motion? (b) State the two inferences that can be drawn from Brownian motion experiment.

Name the three basic components P, Q and R that make up a cathode ray tube, as illustrated in the diagram above

In order to remove the error of parallax when taking measurements with a metre rule, the eye should be focused

Calculate the total distance covered by a train before coming to rest if its initial speed is 30ms-1 with a constant retardation of 0.1m-2

If a freely suspended object is pulled to one side and released, it oscillates about the point of suspension because the

An object of mass 20kg slides down an inclined plane at an angle of 30o to the horizontal. The coefficient of static friction is? [g = 10ms-2]

I. It is a rapid, constant and irregular motion of tiny particles. II. It gives evidence that tiny particles of matter called molecules exist. III. It takes place only in gases. IV. It gives evidence that molecules are in a constant state of random motion. which of the combinations above is correct about Brownian notion?

A pinhole camera is placed 300m in front of a building so that the image is formed on a screen 5cm from the the pinhole. If the image is 2.5cm high, the height of the building will be

A glass block of thickness 10cm is placed on an object. If an observer views the object vertically, the displacement of the object is