Post Utme Physics Past Questions and Answers

Question 251:

Which of the following expressions give the relationship between the acceleration due to gravity at the earth's surface \(g\) and the universal constant of gravitation G?

A. \(\mathrm{g}=G M / 2 R\)
b. \(\mathrm{g}=G M m / R\)
B. \(\mathrm{g}=G M m / R^{2}\)
C. \(\mathrm{g}=G M / R 2\)

Question 252:

The number of protons in an element increased by one after a radioactive decay. The element must have decayed by emitting ____________

A. A gamma ray
B. A beta particle
C. An alpha particle
D. A neutron

Question 253:

From the kinetic theory of gases, temperature is a ____________

A. Form of energy and is proportional to the total kinetic energy of the molecules.
B. Form of energy and is proportional to the average kinetic energy of the molecules.
C. Physical property and is proportional to the total kinetic energy of the molecules.
D. Physical property and is proportional to the average kinetic energy of the molecules.

Question 254:

A 20-toothed gear wheel drives a 60 -toothed one. If the angular speed of the smaller wheel is 120 rev \(\mathrm{s}^{-1}\) the angular speed of the larger wheel is ____________

A. \(3 \mathrm{rev} \mathrm{s}^{-1}\)
B. \(40 \mathrm{rev} \mathrm{s}^{-1}\)
C. \(360 \mathrm{rev} \mathrm{s}^{-1}\)
D. \(2400 \mathrm{rev}^{-1}\)

Question 255:

The speed of sound in air at sea-level is \(340 \mathrm{~ms}^{-1}\), while that of light is \(300000 \mathrm{~km}^{-1}\).

How far (to the nearest meter) from the centre of a thunderstorm is an observer who hears a thunder \(2 \mathrm{~s}\) after a lightening flash?

A. \(170 \mathrm{~m}\)
B. \(340 \mathrm{~m}\)
C. \(600 \mathrm{~m}\)
D. \(680 \mathrm{~m}\)