Physics Past Questions and Answers

A pipe open at both ends, produces a fundamental note. If the velocity of sound in air is V and L the length of the pipe, which of the following expresses the frequency of the note? Neglect end correction

A 2V/L
B V/2L
C V/3L
D V/4L
E V/5L

Question 572:

Which of the following statements is not correct?

A The pitch of a note depends on the frequency of the vibrating source
B The loudness of a note depends on its intensity
C The velocity of sound in air does not depend on the intensity of the note producing it
D The overtones present in a note determine its quality
E Wind speed effects on the speed of sound in air

Question 573:

A progressive wave has a wavelength of 50cm. calculate the phase difference between two points at a distance of 20cm apart.

A 10/3Ï€
B 5/2 π
C 4/5 Ï€
D 2/3 Ï€
E Ï€/3

Question 574:

An alternating current with a peak value of 5A passes through a resistor of resistance 10â„¦. Calculate the rate at which energy is dissipated in the resistor

A 250W
B 125W
C 50W
D 35.4W
E 12.5W

Question 575:

The invisible part of the spectrum of a white light consists of the following colors

A Red, orange and yellow only
B Infra-red, ultraviolet and blue only
C Indigo and green only
D Violet and red only
E Ultra violet and infra-red only