Post Utme Physics Past Questions and Answers

Question 586:

On a rainy day of \(20^{\circ} \mathrm{C}\), the length of a steel track is \(20 \mathrm{~m}\). what will be its length on a hot day with temperature of \(40^{\circ} \mathrm{C}\) ?

[Coefficient of linear expansion of steel \(\left.=1.1 \times 10^{6} \mathrm{~K}^{-1}\right]\)

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

Question 587:

One of the following phenomena must occur whenever white light is dispersed

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

Question 588:

The count rate of a radioactive material is 800 count/min. If the half-life of the material is 4 days what would the count rate be 16 days later?

A. 50 count/min
B. 25 count/min
C. 200 count/min
D. 100 count/min

Question 589:

The force on a charge moving with a velocity \(v\) in a magnetic field \(B\) is half of the maximum force when the angle between wave B is ____________

A. \(0^{\circ}\)
B. \(90^{\circ}\)
C. \(45^{\circ}\)
D. \(30^{\circ}\)

Question 590:

The vertical displacement experienced by a vibrating body during wave motion is called ____________

A. Period
B. A cycle
C. Amplitude
D. Displacement
E. Distance