Post Utme Physics Past Questions and Answers

Question 21:

An air bubble trapped at a depth in a liquid rises to the surface. Which of the following is true about its mass and density as it rises?

A. Its mass and density increase
B. Its mass is constant while its density decreases
C. Its mass and density is constant
D. Its mass is constant while its density increases

Question 22:

Complete the following sentence: The operation of a hydraulic jack is an application of ____________

A. Pascal's principle
B. Archimedes' principle
C. Bernoulli's principle
D. Irrotational flow

Question 23:

Complete the following statement: Today, the standard meter is defined in terms of ____________

A. The distance from the earth's equator to the north pole.
B. The wavelength of light emitted from a krypton atom.
C. The wavelength of light emitted from a sodium atom.
D. The speed of light.

Question 24:

Convert 30 metre per second to centimeter per minute ____________

A. \(20,000 \mathrm{~cm} / \mathrm{min}\)
B. \(180,000 \mathrm{cm} / \mathrm{min}\)
C. \(120,000 \mathrm{~cm} / \mathrm{min}\)
D. \(150,000 \mathrm{~cm} / \mathrm{min}\)

Question 25:

During a football match, player A kicks the ball \(40 \mathrm{~m}, 30^{\circ} \mathrm{E}\) of \(\mathrm{S}\) to player \(\mathrm{B}\) who instantly kicks it \(30 \mathrm{~m}, 60^{\circ} \mathrm{E}\) of \(\mathrm{N}\). What is the magnitude of the resultant displacement of the ball?

A. \(30 \mathrm{~m}\)
B. \(40 \mathrm{~m}\)
C. \(50 \mathrm{~m}\)
D. \(60 \mathrm{~m}\)