Post Utme Physics Past Questions and Answers

Question 1221:

Five 100 - watt bulbs are put on for 45 days during which the home - owner is on vacation. If \(1 KW\) - hour of electricity costs \(\# 7.50\), how much does it cost the home owner?

A. # \(168.75\)
B. # \(90.00\)
C. # \(4050.00\)
D. # \(810.00\)

Question 1222:

To convert an a.c. generator to a d.c. generator, one needs to ____________

A. Remove the brush touching the slip rings
B. Laminate the armature
C. Replace the permanent magnets with soft iron-core armature
D. Replace the slip rings with split rings

Question 1223:

A student afraid that the substance near him is radioactive places his lecture note between him and the substance. It truly the substance is radioactive, which of the following radiations can the notebook shield him from?

A. Gamma rays
B. Neutrons
C. Alpha particles
D. Energetic beta ray

Question 1224:

A body of mass \(M\) slides down an inclined plane with constant velocity. If the angle of the incline is \(\vartheta\), the coefficient of kinetic friction between the body and the plane is ____________

A. \(\cot \theta\)
B. \(\cos \theta\)
C. \(\tan \theta\)
D. \(\sin \theta\)

Question 1225:

The density of sea water is \(1030 kg / m ^{3}\). What is the pressure at a depth of \(80 m\) below sea surface? [Atmospheric pressure is \(1.013 \times 10^{5} Pa\) and acceleration due to gravity is ____________
\(\left.10 m / s ^{2}\right]\).

A. \(9.25 \times 10^{5} Pa\)
B. \(8.24 \times 10^{5} Pa\)
C. \(7.23 \times 10^{5} Pa\)
D. \(8.34 \times 10^{9} Pa\)