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QUIZ 1: Waves(#Free Test Series)


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15 Questions MCQ Test | QUIZ 1: Waves(#Free Test Series)

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QUIZ 1: Waves(#Free Test Series) - Question 1

 Two identical straight wires are stretched so as to produce 6 beats per second when vibrating simultaneously. On changing the tension in one of them, the beat frequency remains unchanged. Denoting by T1,T2  the higher and the lower initial tensions in the strings, then it could be said that while making the above change in tension 

QUIZ 1: Waves(#Free Test Series) - Question 2

An open pipe is in resonance in its 2nd harmonic with tuning fork of frequencyf1. Now it is closed at one end. If the frequency of the tuning fork is increased slowly from f1 then again a resonance is obtained with a frequency f2. If in this case the pipe vibrates nth harmonics then 

QUIZ 1: Waves(#Free Test Series) - Question 3

 Vibrating tuning fork of frequency n is placed near the open end of a long cylindrical tube. The tube has a side opening and is fitted with a movable reflecting piston. As the piston is moved through   8.75 cm, the intensity of sound changes from a maximum to minimum. If the speed of sound is 350 m/s. Then n is 

QUIZ 1: Waves(#Free Test Series) - Question 4

 A stone is hung in air from a wire which is stretched over a sonometer. The bridges of the sonometer are L cm apart when the wire is in unison with a tuning fork of frequency N. When the stone is completely immersed in water, the length between the bridges is ℓ cm for re-establishing unison, the specific gravity of the material of the stone is

Detailed Solution for QUIZ 1: Waves(#Free Test Series) - Question 4

https://doubtnut.com/question-answer-physics/a-stone-is-hung-in-air-from-a-wire-which-is-stretched-over-a-sonometer-the-bridges-of-the-sonometer--16002861

QUIZ 1: Waves(#Free Test Series) - Question 5

Two pulses in a stretched string whose centres are initially 8 cm apart are moving towards each other as shown in the figure. The speed of each pulse is 2 cm/s. After 2 seconds, the total energy of the pulses will be 

Detailed Solution for QUIZ 1: Waves(#Free Test Series) - Question 5

After 2 secs
Pulse 1 will travel 4 cm to the right and pulse 2 will travel 4 cm to the left and both of them will cancel out.
But this only cancels out the PE we still have KE and hence D is correct.

QUIZ 1: Waves(#Free Test Series) - Question 6

 A source of sound of frequency f1 is placed on the ground. A detector placed at a height is released from rest on this source. The observed frequency f(Hz) is plotted against time t(sec). The speed of sound in air is 300 m/s. Find f1(g=10m/s2) 

QUIZ 1: Waves(#Free Test Series) - Question 7

 When beats are produced by two progressive waves of nearly the same frequency, which one of the following is correct?

QUIZ 1: Waves(#Free Test Series) - Question 8

 Which of the following statements is correct for stationary waves?

Detailed Solution for QUIZ 1: Waves(#Free Test Series) - Question 8

B is not correct because nodes have 0 intensity whereas rarefactions don’t have 0 intensity.
They are somewhat similar but not analogous and hence incorrect.

QUIZ 1: Waves(#Free Test Series) - Question 9

 A string is under tension so that its length is increased by 1/n times its original length. The ratio of fundamental frequency of longitudinal vibrations and transverse vibrations will be

Detailed Solution for QUIZ 1: Waves(#Free Test Series) - Question 9

QUIZ 1: Waves(#Free Test Series) - Question 10

 A closed organ pipe and an open organ pipe of same length produce 2 beats when they are set into vibration simultaneously in their fundamental mode. The length of the open organ pipe is now halved and of the closed organ pipe is doubled; the number of beats produced will be

QUIZ 1: Waves(#Free Test Series) - Question 11

 The linear density of a vibrating string is10-4 kg/m. A transverse wave is propagating on the string, which is described by the equationy=0.02sin(x+30t), where x andy are in metres and time t in seconds. Then tension in the string is

QUIZ 1: Waves(#Free Test Series) - Question 12

 In sports meet the timing of a 200 m straight dash is recorded at the finish point by starting an accurate stop watch on hearing the sound of starting gun fired at the starting point. The time recorded will be more accurate

QUIZ 1: Waves(#Free Test Series) - Question 13

 A tuning fork produces 4 beats per second with another fork of frequency 288 cps. A little wax is placed on the unknown fork and it then produces 2 beats per second. The unknown frequency is

QUIZ 1: Waves(#Free Test Series) - Question 14

A tuning fork of known frequency 256 Hz makes 5 beats per second with the vibrating string of a piano. The beat frequency decreases to 2 beats per second when the tension in the piano string is slightly increased. The frequency of the piano string before increasing the tension was

QUIZ 1: Waves(#Free Test Series) - Question 15

 While measuring the speed of sound by performing a resonance column experiment, a student gets the first resonance condition at a column length of 18 cm during winter. Repeating the same experiment during summer, he measures the column length to be x centimeter for the second resonance. Then 

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