Post Utme Physics Past Questions and Answers

Question 616:

Which of the following is usually used to capture excess neutron produced in a nuclear reactor?

A. Boron rods
B. Steel rods
C. Graphite rods
D. X-rays

Question 617:

A generator manufacturing company was contracted to produce an a.c dynamo but inadvertently produced a d.c dynamo. To correct the error, the ____________

A. Armature coil should be made of aluminium
B. Armature coil should be made of silver
C. Commutator should be made of silver
D. Commutator should be replaced with rings

Question 618:

Which of the following statements are true of Isotopes?
I. Isotopes of an element has the same properties
II. Isotopes of elements are normally separated using physical methods
III. Isotopes of an element has the same number of protons in their nucleus

A. I and II only
B. I and III only
C. II and III only
D. I, II and III

Question 619:

In an a . c circuit that contains only a capacitor, the current voltage lags behind by ____________

A. \(30^{\circ}\)
B. \(60^{\circ}\)
C. \(90^{\circ}\)
D. \(180^{\circ}\)

Question 620:

On a fairly cool rainy day when the temperature is 20˚C, the length of a steel rail road track is 20cm. What will be its length on a hot dry day when the temperature is \(40^{\circ} \mathrm{C}\) ?

[Coefficient of linear exjpression of steel \(\left.=11 \times 10^{-6} \mathrm{~K}^{-1} \right]\)

A. \(20.009 \mathrm{~m}\)
B. \(20.004 \mathrm{~m}\)
C. \(20.013 \mathrm{~m}\)
D. \(20.002 \mathrm{~m}\)