Question Library

You are provided with a battery of e.m.f, E, a standard resistor, R, of resistance 2 \(\Omega\), a key, K, an ammeter, A, a jockey, J, a potentiometer, UV, and some connecting wires. (i) Measure and record the emf, E, of the battery. (ii) Set up the circuit as shown in the diagram above with the key open. (iii) Place the jockey at the point, U, of the potentiometer wire. Close the key and record the reading, i, of the ammeter. (iv) Place the jockey at a point T on the potentiometer wire UV such that d = UT = 30.0 cm. (v) Close the circuit, read and record the current, I, on the ammeter, (vi) Evaluate I\(^{1}\). (vi) Repeat the experiment for four other values of d = 40.0 cm, 50.0 cm, 60.0 cm and 70.0 cm. In each case, record I and evaluate I\(^{1}\). (vii) Tabulate the results (ix) Plot a graph with d on the vertical axis and I on the horizontal axis stalling both axes from the origin (0,0). (x) Determine the slope, s, of the graph. (xi) From the graph determine the value \(I_1\), of I when d = 0. (ci) Given that=s, calculate 8. (xii) State two precautions taken to ensure accurate results. (xii) Given that \(\frac{E}{\delta}\) = s, calculate \(\delta\). (b)(i) Write down the equation that connects the resistance, R, of a wire and the factors on which it depends. State the meaning of each of the symbols. (ii) An electric fan draws a current of0.75 A in a 240 V circuit. Calculate the cost of using, the fan for 10 hours if the utility rate is $ 0.50 per kWh.

Water is not a good thermometric liquid because it?

Which of the units of the following physical quantities are derived? I. Area II. Thrust III. Pressure IV. Mass

A car of mass 800kg attains a speed of 25m/s in 20secs. The power developed in the engine is?

Which of the following quantities is not an example of force?

The acceleration of a moving object can be determined from the?

The handle of a screw jack is 35 cm long and the pitch of the screw is 0.5 cm. What force must be applied at the end of the handle to lift a load of 2000N, if the efficiency of the jack is 30% [\pi = \(\frac{22}{7}\)]?

A current of 2A passes through a wire of resistance 4\Omega for 3 minutes. Calculate the energy lost.

Which of the following statements best describes the particles in a solid at room temperature? They are

A force of 10 N, acting continuously, increases the kinetic energy of an object from 20.J to 60 J. Find the distance moved by the object.

The following statements about a loudspeaker are correct except?

An ice cube has mass of 20 g at 5^\circC. Calculate the energy required to raise its temperature to 0^\circC. [Specific heat capacity of ice = 2.1 J/g^\circc]

A stone is thrown horizontally with initial velocity 15m/s from a tower 20 m high. How long does it take to reach the ground? [g= 10m/s\(^2\)

According to Pascal's principle, the pressure in a fluid is always?

(a)(i) State Hooke's law. (ii) A spring has a length of 0.20 m when a mass of 0.30 kg hangs on it, and a length of 0.75 nm when a mass of 1.95 kg hangs on it. Calculate the: (i) force constant of the spring; (ii) length of the spring when it is unloaded. [g = 10m/s\(^2\)] (b)(i) What is diffusion? (ii) State two factors that affect the rate of diffusion of a substance. (iii) State the exact relationship between the rate of diffusion of a gas and its density. (c) A satellite of mass, m orbits the earth of mass. M with a velocity, v at a distance R from the centre of the earth. Derive the relationship between the period T, of orbit and R.