Physics 2006 Jamb Past Questions and Answers

Question 41 :

• JAMB 2006

A conductor has a diameter of 1.00 mm and length 2.00m. if the resistance of the material is 0.1Ω, its resistivity is?

A. 2.55 x 10⁵ Ωm
B. 2.55 x 10² Ωm
C. 3.93 x 10^-6 Ωm
D. 3.93 x 10^-8 Ωm

Question 42 :

• JAMB 2006

A 40 kW electric cable is used to transmit electricity through a resistor of resistance 2.0Ω at 800 V. The power loss as internal energy is?

A. 4.0 x 10²W
B. 5.0 x 10²W
C. 4.0 x 10³W
D. 5.0 x 10³W

Question 43 :

• JAMB 2006

The instrument that measures both a.c and d.c is?

A. A current balance
B. A moving current ammeter
C. A moving iron ammeter
D. An inverter

Question 44 :

• JAMB 2006

A 120 V, 60 W lamp is to be operated on 220 V a.c. the supply mains. calculate the values of non-inductive resistance that would be required to ensure that the lamp is run on current value.

A. 100 Ω
B. 200 Ω
C. 300 Ω
D. 500 Ω

Question 45 :

• JAMB 2006

A radioactive substance has a half-life of 20 days what fraction the original radiation nuclei will remain after 80 days?

A. (1)/32
B. (1)/16
C. (1)/ 8
D. (1)/4