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1
JEE Main 2021 (Online) 17th March Morning Shift
MCQ (Single Correct Answer)  +4  -1
For what value of displacement the kinetic energy and potential energy of a simple harmonic oscillation become equal ?
A
x = $${A \over 2}$$
B
x = $$\pm$$ A
C
x = $$\pm$$ $${A \over {\sqrt 2 }}$$
D
x = 0
2
JEE Main 2021 (Online) 26th February Evening Shift
MCQ (Single Correct Answer)  +4  -1
A tuning fork A of unknown frequency produces 5 beats/s with a fork of known frequency 340 Hz. When fork A is field, the beat frequency decreases to 2 beats/s. What is the frequency of fork A?
A
335 Hz
B
345 Hz
C
338 Hz
D
342 Hz
3
JEE Main 2021 (Online) 25th February Morning Slot
MCQ (Single Correct Answer)  +4  -1
A student is performing the experiment of resonance column. The diameter of the column tube is 6 cm. The frequency of the tuning fork is 504 Hz. Speed of the sound at the given temperature is 336 m/s. The zero of the metre scale coincides with the top end of the resonance column tube. The reading of the water level in the column when the first resonance occurs is :
A
13 cm
B
18.4 cm
C
16.6 cm
D
14.8 cm
4
JEE Main 2021 (Online) 24th February Evening Slot
MCQ (Single Correct Answer)  +4  -1
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Which of the following equations represents a travelling wave?
A
y = Aexcos($$\omega$$t $$-$$ $$\theta$$)
B
y = Ae$$-$$x2(vt + $$\theta$$)
C
y = A sin (15x $$-$$ 2t)
D
y = A sinx cos$$\omega$$t
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