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 $=1.1\times {10}^6{\mathrm{K}}^{-1}]$

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