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 $40cm$ 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 $334m/s$ ]

A. $2511Hz$
B. $1670Hz$
C. $835Hz$
D. $345Hz$

Question 1143:

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

A. $2.34m/s$
B. $3.38m/s$
C. $5.98m/s$
D. $2.25m/s$

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 $150Hz$ ?

A. $200Hz$
B. $300Hz$
C. $400Hz$
D. $500Hz$