Post Utme Physics Past Questions and Answers

Question 476:

A bullet of mass 20 g is fired horizontally at a stationary wooden block of mass 380 g with a velocity of 200 m/s.
If the bullet embeds itself in the block, their common velocity is ____________

A. 10.0 m/s
B. 0.1 m/s.
C. 4.0 m/s
D. 0.0 m/s

Question 477:

The velocity ratio of a simple machine is defined as ____________

A. The ratio of the distance moved by effort to the distance moved by load
B. The ratio of the distance moved by load to the distance moved by effort
C. The ratio of the useful work output of the machine to the total work input
D. None of the above

Question 478:

A machine has a velocity ratio of 6 and is 80% efficient.
The effort needed to lift a load of 300 N with the aid of the machine is ____________

A. 4.8 N.
B. 300 N
C. 62.5 N
D. 63.5N

Question 479:

An open organ pipe has a length of 6 m. If the speed of sound in air is 340 m/s and neglecting the end- corrections, the frequency of its first overtone is

A. 56.67 Hz
B. 28.33 Hz
C. 85 Hz
D. 1.3 kHz

Question 480:

A piano wire 0.5 m long has a total mass of 0.01 kg and is stretched with a tension of 800 N.
The frequency of its fundamental note is ____________

A. 400 Hz
B. 100 Hz
C. 200 Hz
D. 300 Hz