Find the weight of the pendulum bob by using the following apparatuses: retort stand, clamps, metre rule, cotton thread, wood pads and stopwatch. Conduct an experiment through the given procedures and then answer the questions that follow. Procedures: (a) Set the experiment in such a way that the pendulum bob is at a height, (H) = 100 cm from the ground to the centre of the bob and a length, l of the thread be 60 cm from the point of suspension to the centre of the pendulum bob. (b) Slightly displace the pendulum bob at a small angle and release to allow it swing and measure the time t required to complete 20 oscillations and calculate its periodic time T. (c) Repeat the procedure in 1(b) by increasing the length of thread, l = 70 cm, 80 cm, 90 cm, 100 cm and 120 cm each time recording the values of H and t and hence its corresponding periodic time T. (d) Finally, measure the mass m in kg of the pendulum bob, by using a beam balance.

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Conduct an experiment to verify whether wire Q has high conductivity or the same as that of copper. Follow the procedures provided and then answer the questions that follow. Procedures: (a) Connect a dry cell, an ammeter, a voltmeter, a key K and rheostat in series. (b) Join a voltmeter across the battery terminal. (c) With the Key K open, record the voltmeter reading. (d) With the Key K closed, adjust the rheostat so that the ammeter pointer is at exactly 0.2 A and record its corresponding voltmeter reading in volts. (e) Repeat procedure 3 (d) with ammeter readings of 0.4, 0.6, 0.8 and 1.0 A.

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