EASY
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How much intense is 80 dB sound in comparison to 40 dB?

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Important Questions on Sound

MEDIUM
A uniform rope of length L and mass m1, hangs vertically from a rigid support. A block of mass m2 is attached to the free end of the rope. A transverse pulse of wavelength λ1 is produced at the lower end of the rope. The wavelength of the pulse when it reaches the top of the rope is λ2. The ratio λ2λ1 is:
MEDIUM
A man playing a flute is able to produce notes of different frequencies. If he closes the holes near his mouth, will the pitch of the note produced, increase or decrease? Give a reason.
EASY
It is observed that during march-past we hear a base drum distinctly from a distance compared to the side drums. Give a reason for the above observation.
MEDIUM
A hearing test is conducted on an aged person. It is found that her threshold of hearing is 20 dB at 1 kHz, and it rises linearly with frequency to, 60 dB at, 9 kHz. The minimum intensity of sound that the person can hear at, 5 kHz is,
MEDIUM
The intensity of sound during the festival season increased by, 100 times. This could imply a decibel level rise from-
MEDIUM
A string of length 1 m and mass 5 g is fixed at both ends. The tension in the string is 8.0 N. The string is set into vibration using an external vibrator of frequency 100 Hz. The separation between successive nodes on the string is close to
EASY

It is observed that during march-past we hear a base drum distinctly from a distance compared to the side drums.
Name the characteristic of sound associated with the above observation.

EASY

A uniform string of length 20 m is suspended from a rigid support. A short wave pulse is introduced at its lowest end. It starts moving up the string. The time taken to reach the support is 

(Take, g=10 m s-2)

EASY
The intensity of a sound appears to an observer to be periodic. Which of the following can be the cause of it?
EASY
Two waves of the same pitch have amplitudes in the ratio 1:3. What will be the ratio of their intensities?
MEDIUM
A simple harmonic motion is represented by:
y=5sin3πt+3cos3πt cm
The amplitude and time period of the motion are:
EASY
Bass control in stereo system increases the power of
HARD
Two vectors A and B are defined as A=ai^ and B=acosωti^+sinωtj^, where a is a constant and ω=π6 rad s-1. If A+B=3A-B at time t=τ for the first time, the value of τ in seconds, is_______
EASY
A travelling harmonic wave is represented by the equation yx, t=10-3sin50t+2x, where x and y are in meter and t is in seconds. Which of the following is a correct statement about the wave?
HARD
A particle performing S.H.M. starts from the equilibrium position and its time period is 16 s. After 2 s its velocity is π m s-1. Amplitude of oscillation is cos45o=12
MEDIUM
The pressure wave, P=0.01sin1000t-3xN m2 , corresponds to the sound produced by a vibrating blade on a day when atmospheric temperature is 0°C . On some other day when temperature is T , the speed of sound produced by the same blade and at the same frequency is found to be 336 m s1 . Approximate value of T is:
MEDIUM
A tunning fork of frequency 480 Hz is used in an experiment for measuring speed of sound v in air by resonance tube method. Resonance is observed to occur at two successive lengths of the air column, l1=30cm and l2=70  cm. Then, ν is equal to:
EASY
Two waves of the same pitch have amplitudes in the ratio 1:3. What will be the ratio of their frequencies?
EASY
Which characteristic of sound, makes it possible to recognize a person by his voice without seeing him?
MEDIUM
A small speaker delivers 2 W of audio output. At what distance from the speaker will one detect 120  dB intensity sound? [Given reference intensity of sound as 10-12 W/m2 ]