Waves

Waves

These MCQs are intended for checking your Physics subject, Chapter Waves knowledge.

The extension in a string, obeying Hookes law is X. The speed of sound in the stretched string is V. If the extension in the string is increased to 1.5 X, the speed of sound will be

The frequency of the note produced by plucking a given string increases as

A resonating column of air contains

To demonstrate the phenomenon of beats we need

A resonance air column of length 40 cm resonates with a tuning fork of frequency 450 Hz. Ignoring end correction, the velocity of sound in air will be

Energy is not carried by

Energy is to be carried from one place to another. Which one of the following cannot be used?

Four wires of identical lengths, diameters and material and stretched on a sonometer box. The ratio of their tension is 1 : 4 : 9 : 16. the ratio of their fundamental frequencies is

Transverse are generated in two uniform wires A and B by attaching their free ends to a vibrating source of frequency 600 Hz. The diameter of wire A is one-third that of wire B and tension in the wire A is double that in wire B. What is the ratio of velocities of waves of waves in wire A and B?

A siren placed at a railway platform is emitting sound of frequency 5 kHz. A passenger sitting in a moving train A records a frequency of 5.5 kHz while the train approaches the siren. During his return journey in a different train B he records a frequency of 6.0 kHz while approaching the same siren. The ratio of velocity of train B to that of train A is

String is in fundamental mode of vibration then velocity is directly proportional to _______

A whistle giving out 450 Hz approaches a stationary observer at a speed of 33 m/s. The frequency heard by the observer in Hz is

The equation of wave traveling along string is y = 3 cos p (100t – x) in C.G.S. unit then wavelength is

To demonstrate the phenomenon of beats we need

An observer is moving towards a stationary source of frequency 250 Hz with a velocity of 40 m/s. If the velocity of sound is 330 m/s, the apparent frequency heard by the observer will be

When a compression is incident on rigid wall it is reflected as

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