Physics Past Questions and Answers

Which of the following statements about a three-pin plug is/are correct. i. The brown wire is the live wire. ii. The fuse is connected to the live wire. iii. The earth wire is coloured blue

The symbol illustrated above is that of a resistor

A wire of cross-sectional area 0.60mm<sup style='font-size: smaller;'>2</sup> has a restivity of 7.2 x 10<sup style='font-size: smaller;'>-7</sup> \(\Omega\). Calculate the length of wire that will have a resistance of 3\(\Omega\).

A battery of emf 24V is connected to three resistor P, Q and R as illustrated in the given diagram. Determine the voltage across the resistor Q.

The mass of the earth is 6.0 x 10<sup style='font-size: smaller;'>24</sup>kg and that of the moon is 7.0 x 10<sup style='font-size: smaller;'>22</sup>kg. If the distance between them is 4.0 x 10<sup style='font-size: smaller;'>8</sup>m, calculate the force of attraction between them. [G = 6.7 x 10<sup style='font-size: smaller;'>-11</sup>Nm<sup style='font-size: smaller;'>2</sup>kg<sup style='font-size: smaller;'>-2</sup>]