Jamb Physics 2012 Past Questions and Answers

Question 101:

• JAMB 2012

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:

• JAMB 2012

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/√2
B. 2/√A
C. 2 A
D. √2 A

Question 103:

• JAMB 2012

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:

• JAMB 2012

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/√2
B. 2/√A
C. 2 A
D. √2 A

Question 105:

• JAMB 2012

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