Physics Past Questions and Answers

Which of the following methods CANNOT be used to produce a steel magnet? The

A Passing of an electric current through a solenoid
B Repeated stroking of the specimen with a magnet
C Repeated stroking of the specimen in opposite directions with magnets
D Heating of the specimen
E Hammering of the specimen in the earth's magnetic field

Question 362:

A cell gives a current of 0.15A through a resistance of 8\(\Omega\) and 0.3A. When the resistance is changed to 3\(\Omega\) the internal resistance of the cell is

A 0.05\(\Omega\)
B 1.00\(\Omega\)
C 1.50\(\Omega\)
D 2.00\(\Omega\)
E 2.50\(\Omega\)

Question 363:

Which of the following will convert a milliammeter to a voltmeter?

A Low series resistance
B Low parallel resistance
C High series resistance
D High parallel resistance
E Parallel resistance equal to milliammeter resistance

Question 364:

A wire P has half the diameter and half the length of a wire Q of similar material. The ratio of the resistance of P to that of Q is

A 8 : 1
B 4 : 1
C 2 : 1
D 1 : 1
E 1 : 4

Question 365:

An electric kettle, connected to a 240V mains, produces 6.0 x 10<sup style='font-size: smaller;'>5</sup>J of heat energy to boil a quantity of water in 5 minutes. Find the resistance of the kettle.

A 14.4\(\Omega\)
B 28.8\(\Omega\)
C 144\(\Omega\)
D 288\(\Omega\)
E 2880\(\Omega\)