Jamb Physics 2007 Past Questions and Answers

Question 46:

• JAMB 2007

A 40KW electric cable was uses to transmit electricity through a resistor of resistance 2.00Ω at 800V. 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 47:

• JAMB 2007

The instrument that measures both ac and dc is called

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

Question 48:

• JAMB 2007

two long parallel wires X and Y carry currents 3A and 5A each. if the force experienced by unit length is 5 x 10^-5N. the force per unit length experienced by wire Y is

A. 3 x 10^-5
B. 3 x 10^-6
C. 5 x 10⁵
D. 5 x 10^-5

Question 49:

• JAMB 2007

Lenz's law is a law of conservation of

A. Electric charge
B. Electric current
C. Energy
D. Momentum

Question 50:

• JAMB 2007

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

A. 100Ω
B. 200Ω
C. 300Ω
D. 500Ω