1
JEE Main 2017 (Offline)
+4
-1
A particle is executing simple harmonic motion with a time period T. At time t = 0, it is at its position of equilibrium. The kinetic energy – time graph of the particle will look like:
A
B
C
D
2
JEE Main 2016 (Online) 10th April Morning Slot
+4
-1
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 :
A
680 Hz
B
510 Hz
C
340 Hz
D
170 Hz
3
JEE Main 2016 (Online) 9th April Morning Slot
+4
-1
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 :
A
450 Hz
B
540 Hz
C
648 Hz
D
270 Hz
4
JEE Main 2016 (Offline)
+4
-1
A uniform string of length $$20$$ $$m$$ is suspended from a rigid support. A short wave pulse is introduced at its lowest end. It starts moving up the string. The time taken to reach the supports is :
(take $${\,\,g = 10m{s^{ - 2}}}$$ )
A
$$2\sqrt 2 s$$
B
$$2\pi \sqrt 2 s$$
C
$$2\pi \sqrt 2 s$$
D
$$2$$ $$s$$
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