Physics Past Questions and Answers

I. Low pressure.
II. High pressure.
III. High p.d.
IV. Low p.d.
Which combination of the above is true of the conduction of electricity through gases?

A I and IV only
B I and III only
C II and IV only
D II and III only

Question 102:

The current through a resistor in an a.c circuit is given as 2 sin wt. Determine the d.c. equivalent of the current

A A/âˆš2
B 2/√A
C 2 A
D âˆš2 A

Question 103:

I. Low pressure.
II. High pressure.
III. High p.d.
IV. Low p.d.
Which combination of the above is true of the conduction of electricity through gases?

A I and IV only
B I and III only
C II and IV only
D II and III only

Question 104:

The current through a resistor in an a.c circuit is given as 2 sin wt. Determine the d.c. equivalent of the current

A A/âˆš2
B 2/√A
C 2 A
D âˆš2 A

Question 105:

The primary coil of a transformer has N turns and is connected to a 120 V a.c. power line. If the secondary coils has 1 000 turns and a terminal voltage of 1 200 volts, what is the value of N?

A 120
B 100
C 1 000
D 1 200