Post Utme Physics Past Questions and Answers

Question 1311:

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

A. $3.5V$
B. $2.5V$
C. $4.5V$
D. $2.35V$

Question 1312:

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

A. $2.25\times {10}^{8}m{s}^{-2}$
B. $2.25\times {10}^{8}m{s}^{-1}$
C. $4.00\times {10}^{8}m{s}^{-1}$
D. $4.33\times {10}^{8}m{s}^{-1}$

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