Physics Past Questions and Answers

At different locations on the earth's surface, the earth's magnetic field is

A The same in magnitude and direction
B The same in magnitude but different in direction
C Different in both magnitude and direction
D Different in magnitude but different in direction

Question 32:

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 1 : 6
B 1 : 3
C 2 : 1
D 6 : 1

Question 33:

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

A 16.0A
B 8.0A
C 0.8A
D 0.4A

Question 34:

The purpose of a dielectric material in a parallel plate capacitor is to

A Increase its capacitance
B Decrease its capacitance
C Insulate the plate from each other
D Increase the magnetic field between the plates

Question 35:

An electric current of 2 amperes flows in a heating coil of resistance 50 ohms for 3 minutes 20 seconds. Determine the heat produced

A 0.5kJ
B 8.0kJ
C 20.0kJ
D 40.0kJ