1

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 $$340\,m{s^{ - 1}}$$)

2

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.)

3

JEE Main 2017 (Online) 9th April Morning Slot

MCQ (Single Correct Answer)

+4

-1

In an experiment to determine the period of a simple pendulum of length 1 m, it is attached to different spherical bobs of radii r

_{1}and r_{2}. The two spherical bobs have uniform mass distribution. If the relative difference in the periods, is found to be 5×10^{−4}s, the difference in radii, $$\left| {} \right.$$r_{1}$$-$$ r_{2}$$\left| {} \right.$$ is best given by :4

JEE Main 2017 (Online) 8th April Morning Slot

MCQ (Single Correct Answer)

+4

-1

Two wires W

_{1}and W_{2}have the same radius r and respective densities $$\rho $$_{1}and $$\rho $$_{2}such that ρ_{2}= 4$$\rho $$_{1}. They are joined together at the point O, as shown in the figure. The combination is used as a sonometer wire and kept under tension T. The point O is midway between the two bridges. When a stationary wave is set up in the composite wire, the joint is found to be a node. The ratio of the number of antinodes formed in W_{1}to W_{2}is :Questions Asked from Waves (MCQ (Single Correct Answer))

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