Post Utme Physics Past Questions and Answers

Question 6:

An a.c voltage is connected to an RLC series circuit of resistance \(5 \Omega\), inductance \(3 \mathrm{mH}\) and a capacitance of \(0.05 \mu \mathrm{F}\). Calculate the resonance frequency.

A. \(11.0 \mathrm{kHz}\)
B. \(12.0 \mathrm{kHz}\)
C. \(13.0 \mathrm{kHz}\)
D. \(14.0 \mathrm{kHz}\)

Question 7:

An electric heater converts \(1 \mathrm{KJ}\) of electrical energy to heat energy every 2 second with \(100 \%\) efficiency. The power produced is ____________

A. \(0.5 \mathrm{KW}\)
B. \(2 \mathrm{KW}\)
C. \(1 \mathrm{KW}\)
D. \(10 \mathrm{~W}\)

Question 8:

Complete the following statement: The electromotive force is ____________

A. The maximum potential difference between the terminals of a battery.
B. The force that accelerates electrons through a wire when a battery is connected to it.
C. The force that accelerates protons through a wire when a battery is connected to it.
D. The maximum capacitance between the terminals of a battery.

Question 9:

If a charged body is moving in a circle on a horizontal plane, what is the general direction of the resulting magnetic field?

A. In the plane of the circle.
B. At an angle 450 to the plane of motion.
C. Along the perpendicular axis through the center of the circle.
D. Along the tangent to the circle.

Question 10:

If a resistor is halved in magnitude and the potential across it is tripled, then the ratio of the old current to the new current is ____________

A. \(1: 3\)
B. \(3: 1\)
C. \(6: 1\)
D. \(1: 6\)