Post Utme Physics Past Questions and Answers

Question 1006:

When white light is dispersed by a spectrometer, the component having the shortest wavelength is ____________

A. Orange
B. Green
C. Red
D. Violet
E. Black

Question 1007:

Which of the following media allow the transmission of sound waves through them ____________
I Air
II Liquid
III Solid

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

Question 1008:

The power dissipated in an a.c circuit with an r.m.s of \(5 A\), r.m.s voltage of \(10 V\) and a phase angle of \(60^{\circ}\) is ____________

A. SOW
B. \(120 W\)
C. \(125 W\)
D. \(25 W\)
E. \(12 W\)

Question 1009:

A light of energy \(5 eV\) falls on a metal and the electrons with a maximum kinetic energy of \(2 eV\) are ejected.
The work fraction of the metal is ____________

A. \(0.4 eV\)
B. \(7.0 eV\)
C. \(2.5 eV\)
D. \(3.0 eV\)
E. \(1.0 eV\)

Question 1010:

In semiconductors, the carriers of current at temperature are ____________

A. Electrons only
B. Electrons and holes
C. Holes only
D. Electrons and ions
E. Lons only