1

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 :2

JEE Main 2017 (Offline)

MCQ (Single Correct Answer)

+4

-1

Out of Syllabus

An observer is moving with half the speed of light towards a stationary microwave source emitting waves
at frequency 10 GHz. What is the frequency of the microwave measured by the observer? (speed of light =
3 ×10

^{8}ms^{–1})3

JEE Main 2016 (Online) 10th April Morning Slot

MCQ (Single Correct Answer)

+4

-1

Out of Syllabus

A toy-car, blowing its horn, is moving with a steady speed of 5 m/s, away from a wall. An observer, towards whom the toy car is moving, is able to hear 5 beats per second. If the velocity of sound in air is 340 m/s, the frequency of the horn of the toy car is close to :

4

JEE Main 2016 (Online) 9th April Morning Slot

MCQ (Single Correct Answer)

+4

-1

Out of Syllabus

Two engines pass each other moving in opposite directions with uniform speed of 30 m/s. One of them is blowing a whistle of frequency 540 Hz. Calculate the
frequency heard by driver of second engine before they pass each other. Speed of sound is 330 m/sec :

Questions Asked from Waves (MCQ (Single Correct Answer))

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