Question Library

Three capacitors each of capacitance 1.5\(\mu F\) are connected in series. The total capacitance in the circuit is

A voltmeter is a device that

Which of the following actions will not increase the sensitivity of a moving coil galvanometer?

Nuclear fission is preffered to nuclear fusion in the generation of energy because

Control in nuclear reactors is effected with boron rods because rhe rods have the ability to

A radioactive element has a decay constant of 0.077s-1. Calculate its half-life

The diagram above shoes three forces F1, F2 and F3, which of the following ewuations is correct?

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 wire gradually stretched by loading it until it snaps. (a) Sketch a load-extension graph for the wire (b) Indicate on the graph the (i) elastic limit (E); (ii) yield point (Y); (iii) breaking point (B).

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\(^{-1}\)]

The horizontal component of the initial speed of a particle projected at 30^\circ to the horizontal is 50 m\(^{-1}\). If the acceleration of free fall due to gravity is 10 ms\(^{-2}\), determine its; (a) initial speed; (b) speed at the maximum height reached.

Explain plane polarized light

A ball bearing falls through a viscous liquid (a) Using a labelled diagram of a tall vessel, show all the forces acting on it (b) When will it attain terminal velocity?

Use the diagram to answer question; Camphor is a chemical that sub-limes and interacts with water reducing the surface tension where it is put. Explain why the toy boat illustrated above would move forward with the camphor placed at the back of it but would be stationary before the placement of the camphor.

An electron of charge 1.60 x 10\(^{-19}\)C is accelerated under a potential difference of 1.0 x 10\(^{5}\) V. Calculate the energy of the electron in joules.