Jamb Physics 1990 Past Questions and Answers

Question 36:

• JAMB 1990

Which of the following is most suitable for protecting the circuit of 2000W electric iron connected to a 250V mains?

A. 13A
B. 8A
C. 5A
D. 3A

Question 37:

• JAMB 1990

Electrical power is transmitted at a high voltage rather than low voltage because the amount of energy loss is reduced due to

A. Heat dissipation
B. Production of eddy currents
C. Excessive current discharge
D. Excessive voltage distance

Question 38:

• JAMB 1990

A lamp is rated 240V, 60W. The resistance of the filament is

A. 960\(\Omega\)
B. 16\(\Omega\)
C. 15\(\Omega\)
D. 4\(\Omega\)

Question 39:

• JAMB 1990

A 0 - 10mA galvanometer with a coil resistance of 30\(\Omega\) can be converted to a 0 - 10A ammeter by using

A. 0.03\(\Omega\) series resistor
B. 0.03\(\Omega\) shunt resistor
C. 9.99\(\Omega\) shunt resistor
D. 9.99\(\Omega\) series resistor

Question 40:

• JAMB 1990

The number of neutrons contained in the nucleus \(^{238}_{92}U\) is

A. 92
B. 146
C. 238
D. 330