Post Utme Physics Past Questions and Answers

Question 1311:

An electric cell has an internal resistance of \(2 \Omega\). A current of \(0.5 A\) was measured when a resistor of resistance \(5 \Omega\) was connected across it. Determine the electromotive force of the cell.

A. \(3.5 V\)
B. \(2.5 V\)
C. \(4.5 V\)
D. \(2.35 V\)

Question 1312:

The speed of light in air is \(3 \times 10^{8} ms ^{-1}\). If the refractive index of light from air to water is \(4 / 3\), calculate the speed of light in water.

A. \(2.25 \times 10^{8} ms ^{-2}\)
B. \(2.25 \times 10^{8} ms ^{-1}\)
C. \(4.00 \times 10^{8} ms ^{-1}\)
D. \(4.33 \times 10^{8} ms ^{-1}\)

Question 1313:

It is known that an atomic nucleus comprises of positive charged protons. Which of the following also exist in the nucleus?

A. A beta particle
B. An alpha particle
C. A neutron
D. An electron

Question 1314:

The silver wall of a vacuum flask prevents heat loss due to ____________

A. Conduction
B. Convection
C. Radiation
D. Diffraction

Question 1315:

The electromagnetic waves that are sensitive to temperature changes are ____________

A. Ultra - violet rays
B. Gamma - rays
C. Infra-red rays
D. \(X\) - rays