1995 - JAMB Physics Past Questions and Answers - page 4
If a resistance is halved in value and the potential difference across it is tripled, then the ratio of the new current to the old one is
A 12V battery has an internal resistance of 0.5W.If a cable of 1.0W resistance is connected across the two terminals of the battery, the current drawn from the battery is
The purpose of a dielectric material in a parallel plate capacitor is to
An electric current of 2 amperes flows in a heating coil of resistance 50 ohms for 3 minutes 20 seconds. Determine the heat produced
If the maximum voltage across a 100ohms resistor is 20V, then the maximum power it can dissipate is
Which of the following is required to convert a milliammeter to an ammeter?
The primary winding of a transformer has 400 turns and its secondary has 100 turns. If a source of e.m.f. of 12V is applied to the primary, the secondary e.m.f. will be
A light of energy 5eV falls on a metal and the electrons with a maximum kinetic energy of 2eV are ejected. The work function of the metal is
The half-life of a radio-active element is 9 days, what fraction of atoms has decayed in 36 days?
An alternating source is connected in series to a capacitor of capacity reactance ( 10^3 \sqrt{3} ) and a resistor of resistance 103 Ohms. The Impedance of the circuit is...