Question Library

(a) State Faraday’s second law of electrolysis. (b) An electric charge of 9.6 x 10\(^4\) C liberates 1 mole of substance containing 6.0 x 10\(^{23}\) atoms. Determine the value of the electronic charge

The d.c generator has essentially the same components as the a.c generator except the presence of?

\(^{14}_7\)N + \(^4_2\)He → \(^{17}_8\)O + X In the equation above, the particles X is?

The design of the thermostat of an electric iron is based on the

The diagram above illustrates a bar magnet near a coil connected to a galvanometer, When the magnet is rapidly moves towards the coil i. e.m.f. is induced in the coil ii. the galvanometer needle deflects iii. the magnet is attracted by the coil. Which of the statements above is/are correct?

A negatively charged rod is held close to an uncharged metal ball on an insulating stand. The ball will

If the charge on an object is measured as 4.0 x 10-18C, how many excess electrons does the object possess, given that the charge of an electron is 1.6 x 10-18C

A transformer is required to supply 12 Vrms to operate a toy train set from a 240 Vrms. If the number of turns in the in the secondary coil is 100, calculate the number of turns required in the primary coil

Which of the following is a unit of the time rate of flow of electric charges?

A wire 1.0m long and with cross-sectional area 2.0 x 10-7 m2 has a resistance of 0.1\(\Omega\). Calculate the electrical conductivity of the wire

A voltmeter is a device that

In an electrolysis experiment, the ammeter records a steady current of 1 A. The mass of copper deposited in 30 minutes is 0.66 g. Calculate the error in the ammeter reading. [ Electrochemical equivalent of copper = 0.00033 g C\(^{-1}\)]

(a) Define electrolysis. (b) Classify each of the following substances as an electrolyte or a non-electrolyte (i) sugar solution; (ii) kerosene; (iii) alkaline solution (iv) lemon fruit juice.

You are provided with two resistance wires labeled A and B, a1\(\Omega\) standard resistor Rx, and other necessary apparatus. Connect \(R_x\) in the left-hand gap of the metre bridge, a length L= 100cm of wire A in the right-hand gap, and the other apparatus as shown in the diagram above. Determine and record the balance point P on the bridge wire NQ. Measure and record \(l_x\) = NP and \(l_y\) = PQ. Evaluate \(R_1\) = \(\frac{I_{y}}{L_{x}}\) = \(R_x\) Repeat the procedure for four other values of L= 95, 85, 75 and 65cm. In each case, determine and record the balance point P and the length \(l_x\) and \(l_y\). Also, evaluate \(R_1\). Repeat the experiment with the second wire B. Obtain the balance points P and the values of and \(l_x\) and \(l_y\). Evaluate \(R_1\) = \(\frac{I_{y}}{L_{x}}\) = \(R_x\) in each case. Tabulate your readings. Plot a graph of \(R_2\) on the vertical axis against \(R_1\) on the horizontal axis. Determine the slope, s, of the graph. Evaluate k = \(\sqrt s \). State two precautions taken to obtain accurate results. (b)i. State two advantages of using a potentiometer over a voltmeter for measuring the potential difference. ii. Define the internal resistance of a cell.

A charge 50 µc has electric field strength of 360 NC-1 at a certain point. The electric field strength due to another charge 120 µc kept at the same distance apart and in the same medium is?