Physics 2001 Jamb Past Questions and Answers

Question 26 :

• JAMB 2001

A cell can supply current of 0.4 A and 0.2 A through a 4.0Ω and 10.0Ω resistors respectively.
This internal resistance of the cell is

A. 2.0Ω
B. 1.0Ω
C. 2.5Ω
D. 1.5Ω

Question 27 :

• JAMB 2001

The particles emitted when \( ^{39}_{19}K \text{ decay to } ^{39}_{19}K \) is

A. Gamma
B. Beta
C. Electron
D. Alpha

Question 28 :

• JAMB 2001

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 29 :

• JAMB 2001

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 30 :

• JAMB 2001

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