1
JEE Main 2021 (Online) 25th February Morning Shift
+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
2
JEE Main 2021 (Online) 24th February Evening Shift
+4
-1
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
3
JEE Main 2021 (Online) 24th February Morning Shift
+4
-1
In the given figure, a mass M is attached to a horizontal spring which is fixed on one side to a rigid support. The spring constant of the spring is k. The mass oscillates on a frictionless surface with time period T and amplitude A. When the mass is in equilibrium position, as shown in the figure, another mass m is gently fixed upon it. The new amplitude of oscillations will be :

A
$$A\sqrt {{M \over {M - m}}}$$
B
$$A\sqrt {{{M - m} \over M}}$$
C
$$A\sqrt {{{M + m} \over M}}$$
D
$$A\sqrt {{M \over {M + m}}}$$
4
JEE Main 2020 (Online) 6th September Morning Slot
+4
-1
A sound source S is moving along a straight track with speed v, and is emitting, sound of frequency v0 (see figure). An observer is standing at a finite distance, at the point O, from the track. The time variation of frequency heard by the observer is best represented by:
(t0 represents the instant when the distance between the source and observer is minimum)
A
B
C
D
JEE Main Subjects
Physics
Mechanics
Electricity
Optics
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
Mathematics
Algebra
Trigonometry
Coordinate Geometry
Calculus
EXAM MAP
Joint Entrance Examination