Jamb Physics 2003 Past Questions and Answers

Question 26:

• JAMB 2003

The operation of an optical fibre is based on the principal of

A. Dispersion of light
B. Interference of light
C. Refraction of light
D. Polarization of light

Question 27:

• JAMB 2003

I the diagram above, what would happen to the current I, if another resistor, R₂, is connected in parallel to R₁?

A. It will increase because the equivalent resistance will increase
B. It will decrease if R₂ is greater than R₁
C. It will increase because the effective resistance will decrease
D. It will decrease if R₂ is less than R₁

Question 28:

• JAMB 2003

A wire of 5Ω resistance is drawn out so that its new length is two times the original length. If the resistivity of the wire remains the same and the cross-sectional area is halved, the new resistance is

A. 40Ω
B. 20Ω
C. 10Ω
D. 5Ω

Question 29:

• JAMB 2003

An electron of charge 1.6 x 10^-19C is accelerated between two metal plates. If the kinetics energy of the electron is 4.8 x 10^-17J, the potential difference between the plate is

A. 30V
B. 40V
C. 300V
D. 400V

Question 30:

• JAMB 2003

A magnetic field is said to exist at a point if a force is

A. Exerted on a stationary charge at the point
B. Exerted on a moving charge at the point
C. Deflected at the point
D. Strengthened at the point