1

JEE Main 2018 (Offline)

MCQ (Single Correct Answer)

+4

-1

A granite rod of 60 cm length is clamped at its middle point and is set into longitudinal vibrations. The
density of granite is 2.7 $$\times$$ 10

^{3}kg/m^{3}and its Young’s modulus is 9.27 $$\times$$ 10^{10}Pa. What will be the fundamental frequency of the longitudinal vibrations ?2

JEE Main 2018 (Online) 15th April Evening Slot

MCQ (Single Correct Answer)

+4

-1

5 beats / econd are heard when a tuning fork is sounded with a sonometer wire under tension, when the length of the sonometer wire is either 0.95 m or 1 m. The frequency of the fork will be :

3

JEE Main 2018 (Online) 15th April Morning Slot

MCQ (Single Correct Answer)

+4

-1

A tuning fork vibrates with frequency $$256$$ $$Hz$$ and gives one beat per second with the third normal mode of vibration of an open pipe. What is the length of the pipe ? (Speed of sound in air is $$340\,m{s^{ - 1}}$$)

4

JEE Main 2017 (Online) 9th April Morning Slot

MCQ (Single Correct Answer)

+4

-1

A standing wave is formed by the superposition of two waves travelling in
opposite directions. The transverse displacement is given by

y(x, t) = 0.5 sin $$\left( {{{5\pi } \over 4}x} \right)\,$$ cos(200 $$\pi $$t).

What is the speed of the travelling wave moving in the positive x direction ?

(x and t are in meter and second, respectively.)

y(x, t) = 0.5 sin $$\left( {{{5\pi } \over 4}x} \right)\,$$ cos(200 $$\pi $$t).

What is the speed of the travelling wave moving in the positive x direction ?

(x and t are in meter and second, respectively.)

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