Post Utme Physics Past Questions and Answers

Question 246:

The force constant of the load extension graph of a spring is given by the ____________

A. Slope of the linear portion of the graph
B. Length of the linear portion of the graph
C. Area under the linear portion of the graph
D. Area under the entire graph

Question 247:

Which of the following properties is exclusive to electromagnetic waves?

A. Reflection
B. Refraction
C. Polarization
D. Diffraction

Question 248:

Which of the following is FALSE about gases in kinetic theory of gases?

A. Gases have large molecules
B. The molecules of a gas are all identical
C. The molecules of a gas collide with one another and with the walls of the container
D. As temperature increases, the number of collisions made by the gas molecules increase

Question 249:

For a long-sighted person, light rays from a point on a very distant object is focused ____________

A. In front of the retina
B. Behind the-retina
C. On the retina,
D. Behind the retina by a diverging lens

Question 250:

A copper wire has a resistance of \(25 \mathrm{~m} \Omega\) at \(20^{\prime} \mathrm{C}\) When the wire is carrying current, heat produce by the current causes it's temperature to increase by \(27^{\circ} \mathrm{C}\). What is the change in the wire's resistance? [take temperature coefficient of resistivity of copper, \(\left.a=6.8 \times 10^{-3}\right]\)

A. \(1.2 \mathrm{~m} \Omega\)
B. \(11.8 \mathrm{~m} \Omega\)
C. \(2.3 \mathrm{~m} \Omega\)
D. \(4.6 \mathrm{~m} \Omega\)