Question Library

In the wiring of houses, the fuse is connected to the wire coloured

Which of the following factors does not affect the electric resistance of wire?

Which of the following factors will increase the sensitivity of moving coil meter?

The amplitude of a sound wave determines its

As the air column of length L in an air pipe decreases, the frequency of the sationary wave emitted

A positively charged glass rod is placed near the cap of a positively charged electroscope. The divergence of the leaf is observed to

Capacitors are used in the following devices, except

Use the diagram above to calculate the current, I.

Oxidation of the filament in a light bulb is prevented by the introduction of

In a cathode ray tube, the function of the x-plates is to

A nuclide represented as \(^{70}_{32}X\) has a neutron-proton ratio of

Neutrons are used to induce artificial radioactivity because they

The radioisotope \( ^{235}_{92}U \) decays by emitting two alpha particles, three beta particles and a gamma ray. What is the mass and atomic number of the resulting element?

You are provided with a voltmeter V, a chemical cell/ battery E; two standard resistors R, and R a potentiometer a key K a jockey, and other necessary materials. Set up a circuit as shown in the diagram above. Close the key K. Make contact with the potentiometer wire AB using the jockey at a point C such that AC = x = 20cm Read and record the voltmeter reading Evaluate x\(^{-1}\) and v\(^{-1}\) Repeat the procedure for other values of x= 30, 40, 50, 60 and 80cm. Tabulate your readings. Plot a graph with V\(^{-1}\) on the vertical axis and x\(^{-1}\) on the horizontal axis, starting both axes from the origin (0, 0). Determine the: (a) slope, s, of the graph; (b) intercept, c, on the vertical axis. State two precautions taken to ensure accurate results. (b)i. State the two devices in which ohm's law does not apply. ii. A current of 1 A is supplied to two resistors of resistance 2\(\Omega\) and 3\(\Omega\) connected in parallel. Calculate the current in each resistor.

A force of 40 N is applied at the free end of a wire fixed at one end to produce an extension of 0.24 mm. If the original length and diameter of the wire art., 3 m and 2.0 mm respectively, calculate the: (a) stress on the wire; (b) strain in the wire.