Post Utme Physics Past Questions and Answers

Question 821:

The range of wavelengths of the visible spectrum is \(400 \mathrm{~nm}, 700 \mathrm{~nm}\). The wave length of gamma rays is ____________

A. Longer than \(700 \mathrm{~nm}\)
B. Shorter than \(700 \mathrm{~nm}\) but longer than \(400 \mathrm{~nm}\)
C. \(550 \mathrm{~nm}\)
D. Shorter than \(400 \mathrm{~nm}\)
E. Infinite

Question 822:

If the pressure in \(100 \mathrm{~cm}^{3}\) of an ideal gas is doubled while its Kelvin temperature is halved, then the new volume of the gas will become

A. \(25 \mathrm{~cm}^{3}\)
B. \(50 \mathrm{~cm}^{3}\)
C. \(100 \mathrm{~cm}^{3}\)
D. \(200 \mathrm{~cm}^{3}\)
E. \(16 \mathrm{~m} / \mathrm{s}\)

Question 823:

A train has an initial velocity of \(44 \mathrm{~m} / \mathrm{s}\) and an acceleration of \(4 \mathrm{~m} / \mathrm{s}^{2}\) its velocity after 10 seconds is ____________

A. \(2 \mathrm{~m} / \mathrm{s}\)
B. \(4 \mathrm{~m} / \mathrm{s}\)
C. \(8 \mathrm{~m} / \mathrm{s}\)
D. \(2 \mathrm{~m} / \mathrm{s}\)

Question 824:

A man of mass \(50 \mathrm{~kg}\) ascends a flight of stairs \(5 \mathrm{~m}\) high in 5 seconds. If acceleration due to gravity is \(10 \mathrm{~ms} 10 \mathrm{~ms} 2\) the power expanded is ____________

A. \(100 \mathrm{~W}\)
B. \(300 \mathrm{~W}\)
C. 250W
D. \(400 \mathrm{~W}\)
E. \(500 W\)

Question 825:

The distance travelled by a particle starting from rest Is plotted against the square of the time elapsed from the commencement of motion. The resulting graph is Ilnear. The slope of this graph is a measure of ____________

A. Initlal displacement
B. Initlal velocity
C. Acceleration
D. Half the acceleration
E. Half initial velocity