1

JEE Main 2019 (Online) 12th January Evening Slot

MCQ (Single Correct Answer)

+4

-1

A resonance tube is old and has jagged end. It is still used in the laboratory to determine velocity of sound in air. A tuning fork of frequency 512 Hz produces first resonance when the tube is filled with water to a mark 11 cm below a reference mark, near the open end of the tube. The experiment is repeated with another fork of frequency 256 Hz which produces first resonance when water reaches a mark 27 cm below the reference mark. The velocity of sound in air, obtained in the experiment, is close to :

2

JEE Main 2019 (Online) 12th January Morning Slot

MCQ (Single Correct Answer)

+4

-1

A travelling harmonic wave is represented by the equation y(x,t) = 10

^{–3}sin (50t + 2x), where, x and y are in mater and t is in seconds. Which of the following is a correct statement about the wave ?3

JEE Main 2019 (Online) 11th January Morning Slot

MCQ (Single Correct Answer)

+4

-1

Equation of travelling wave on a stretched string of linear density 5 g/m is y = 0.03 sin(450 t – 9x) where distance and time are measured in SI units. The tension in the string is :

4

JEE Main 2019 (Online) 10th January Morning Slot

MCQ (Single Correct Answer)

+4

-1

Out of Syllabus

A train moves towards a stationary observer with speed 34 m/s. The train sounds a whistle and its frequency registered by the observer is ƒ

_{1}. If the speed of the train is reduced to 17 m/s, the frequency registered is ƒ_{2}. If speed of sound is 340 m/s, then the ratio ƒ_{1}/ƒ_{2}is -Questions Asked from Waves (MCQ (Single Correct Answer))

Number in Brackets after Paper Indicates No. of Questions

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