Post Utme Physics Past Questions and Answers

Question 261:

Which of the following methods CANNOT be used to produce a steel magnet? The ____________

A. Passing of an electric current through a solenoid
B. Repeated stroking of the specimen with a magnet
C. Repeated stroking of the specimen in opposite directions with two magnets
D. Heating of the specimen.
E. Hammering of the specimen in the earth's magnetic fields

Question 262:

Of the following derived units, the one that is not a unit of power is ____________

A. Joule/second
B. Ampere volt
C. Ampere \({ }^{2}\) ohm
D. \(\mathrm{ohm}^{2} /\) volt
E. Volts \({ }^{2} / \mathrm{ohm}\)

Question 263:

Which of the following may be used to determine the relative humidity in a physics laboratory?
I. Manometer
II. Wet and dry bulb hygrometer
III. Hair Hygrometer
IV. Hydrometer

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

Question 264:

A machine has a velocity ratio of 5. It requires a \(50 \mathrm{~kg}\) weight to overcome a \(200 \mathrm{~kg}\) weight. The efficiency is ____________

A. \(4 \%\)
B. \(5 \%\)
C. \(40 \%\)
D. \(50 \%\)
E. 80 %

Question 265:

Two mirror \(M 1\) and \(M 2\) are inclined at right angles as shown above. Calculate the angle of reflection of the ray of light at mirror M2.

A. \(30^{\circ}\)
B. \(45^{\circ}\)
C. \(60^{\circ}\)
D. \(90^{\circ}\)