Physics Past Questions and Answers

Which of the following statements is true of the diagram shown above?

A The two point, A and B are in phase
B Distance AB is halgf the wavelength of the wave
C AC and BD are the amplitude of the wave
D The two points A and B represents the wave crests
E The wave has four crests

Question 212:

A man standing 300m away from the wall sounds a whistle. The echo from the wall reaches him 1.8sec. later, calculate the velocity of sound in air

A 540.0ms^-1
B 333.3ms^-1
C 270.0ms^-1
D 166.7ms^-1
E 83.3ms^-1

Question 213:

In which of the following is a stationary wave produced? i. A vibrating turning fork held near the end of a resonance tube closed at one end. ii. A string tightly stretched between two points and plucked at its middle. iii. The tuning fork vibrating in air

A I only
B Ii only
C I and ii only
D Ii and iii only
E I, ii and iii

Question 214:

A particle of charge q and mass m moving with a velocity v enters a uniform magnetic field b in the direction of the field. The force on the particle is

A QvB
B MqvB/m
C MvB/q
D O

Question 215:

If the frequency of the e.m.f. source in the a.c. circuit illustrated above is \(\frac{500}{\pi}\)Hz. What is the reactance of the inductor?

A 450
B 0.9
C 900
D 567
E 43