Waves - Online Test (07-01-2017) - Class 11 MCQ

A horizontal stretched string, fixed at two ends, is vibrating in its fifth harmonic according to the equation, y(x, t) = (0.01)m sin[(62.8m^-1)] x cos[(628s^-1)t]. the correct statement is

Which one of the following cannot represent a traveling wave

The equation of a progressive wave traveling on a stretched string is y = 10 sin where x and y are in cm and t is in sec. what is the speed of the wave?

A sound wave is represented by

y = a sin (1000πt - 3x). the distance between two points having a phase difference of 60° is

A siren emitting a note of frequency n is fitted on a police van, traveling towards a stationary listener. What is the velocity of the van, if the frequency of the note heard by the listener is double the original frequency?

A wave is represented by the equation

y = A sin (10πx + 15πt + π/3), where x is in meters and t is in seconds. The expression represents

A person speaking normally produces a sound intensity of 40 dB at a distance of 1m. if the threshold intensity for reasonable audibility is 20 dB, the maximum distance at which he can be heard clearly is

Two waves are y₁ = 0.25 sin 316t, y₂ = 0.25 sin 310t are traveling in same direction. The number of beats produced per second will be

The displacement y (in cm) produced by a simple harmonic wave is given bythe periodic time and maximum velocity of the particles in the medium will respectively be

Two sounding bodies producing progressive wave given by y₁ = 4 sin 400 pt and y₂ = 4 sin 404 pt are situated very near to the ears of a person who will hear

56 tuning forks are so arranged in series, that each fork gives 4 beats/second with the previous one. If the frequency of the last fork is 3 times that of the first, then the frequency of the first fork will be

If the amplitude of sound is doubled and the frequency reduced to one-fourth, the intensity of sound at the same point will be

A whistle giving out 450 Hz approaches a stationery observer at a speed of 33 m/s. the frequency heard by the observer in Hz is (velocity of sound = 330 m/s)

The fork A of frequency 100 Hz is sounded with an other tuning fork B. the number of beats produced is 2. on putting some wax on the prong of B. the number of beats reduces to 1. the frequency of the fork B is

There are three sources of sound of equal intensity with frequencies 400, and 401 and 402 vibrations/sec. the number of beats heard per second is

In a wave motion, the velocity of the wave (V) and the maximum particle velocity (V_P) are related as

The phase difference between two points is π/3. If the frequency of wave is 50 Hz. Then what is the distance between two points (Given n = 330 m/s)

When a string is divided into three segments of length L₁, L₂ , L₃, the fundamental frequencies of these three segments are respectively. The original fundamental frequency (v) of the string is :

A speeding motorcyclist sees traffic jam ahead of him. He slows down to 36 km/h. he finds that traffic has eased and a car moving ahead of him at 18 km/h is honking at a frequency of 1392 Hz. If the speed of sound is 343 m/s, the frequency of the honk as heard by him will be:

The equation of a wave on a string of linear mass density 0.04 kg/m is given by:

The tension in the string is:

An open organ pipe of length L vibrates in its fundamental mode. The pressure variation is maximum:

If the length of a closed organ pipe is 1 m and velocity of sound is 330 m/s, then the frequency of 1^st overtone is:

A wave represented by the equation : y = acos (kx - ωt) is superposed with another wave to form a stationary wave such that the point x = 0 is a node. The equation of the other wave is:

A pipe open at both ends has a fundamental frequency f in air. The pipe is dipped vertically in water so that half of it is in water. The fundamental frequency of the air column is now

If the tension of a sonometer wire increases four times then the fundamental frequency of the wire will increase by

Speed of a wave in a string forming a stationary wave do not depend on

Two monoatomic ideal gasses 1 and 2 of molecular masses m₁ and m₂ are enclosed in separate columns kept at the same temperature. The ratio of the speed of sound in gas 1 to that in gas 2 is given by