Post Utme Physics Past Questions and Answers

Question 801:

a metal of volume \(40 \mathrm{~cm}^{3}\) is heated from \(30^{\circ} \mathrm{C}\) to \(90^{\circ} \mathrm{C}\), the increase in volume is

[linear exparisivity of metal \(=2.0 \times 105 \mathrm{k}\).

A. \(0.12 \mathrm{~cm}^{3}\)
B. \(4.00 \mathrm{~cm}^{3}\)
C. \(1.20 \mathrm{~cm}^{3}\)
D. \(0.40 \mathrm{~cm}^{3}\)

Question 802:

When the human eyes loses its power of accommodation, the defect is known as ____________

A. Short-sightedness
B. Presbyopia
C. Astigmatism
D. Long-sightedness

Question 803:

A length of wire has a frequency of \(255 \mathrm{~Hz}\) when stretched by a force 225 . If the force increases by \(324 \mathrm{~N}\), what is the new frequency of vibration?

A. \(306 \mathrm{~Hz}\)
B. \(512 \mathrm{~Hz}\)
C. \(488 \mathrm{~Hz}\)
D. \(356 \mathrm{~Hz}\)

Question 804:

A certain far sighted person cannot see near objects that are closer to the eye than \(50 \mathrm{~cm}\) clearly. Determine the power of the converging lens which will enable him to see at \(25 \mathrm{~cm}\).

A. \(0.06 \mathrm{D}\)
B. \(0.02 \mathrm{D}\)
C. \(0.03 \mathrm{D}\)
D. \(0.04 \mathrm{D}\)

Question 805:

Which of the following electromagnetic waves as the highest frequency?

A. Ultra-violet rays
B. Radio wave
C. X-rays
D. Infrared rays