Post Utme Physics Past Questions and Answers

Question 1141:

The process by which a solid changes directly to vapour is called ____________

A. Evaporation
B. Fusion
C. Condensation
D. Sublimation

Question 1142:

A resonance tube is \(40 cm\) long. The second resonance is heard when the tube is three - quarter full. What is the frequency of the tuning fork placed near the mouth of the tube?
[Velocity of sound in air is \(334 m / s\) ]

A. \(2511 Hz\)
B. \(1670 Hz\)
C. \(835 Hz\)
D. \(345 Hz\)

Question 1143:

A \(326 g\) object is attached to a spring and executes simple harmonic motion with a period of \(0.250 s\). If the total energy of the system is \(5.8 J\), what is the maximum speed of the object?

A. \(2.34 m / s\)
B. \(3.38 m / s\)
C. \(5.98 m / s\)
D. \(2.25 m / s\)

Question 1144:

Rectifiers are used to convert

A. Direct current to alternating current
B. Alternating to direct current
C. High voltage to low voltage
D. Low voltage to high voltage

Question 1145:

Which of the following frequencies is/are higher harmonic(s) of a string with fundamental frequency of \(150 Hz\) ?

A. \(200 Hz\)
B. \(300 Hz\)
C. \(400 Hz\)
D. \(500 Hz\)