1
JEE Advanced 2020 Paper 2 Offline
MCQ (More than One Correct Answer)
+4
-2
Change Language
In an X-ray tube, electrons emitted from a filament (cathode) carrying current I hit a target (anode) at a distance d from the cathode. The target is kept at a potential V higher than the cathode resulting in emission of continuous and characteristic X-rays. If the filament current I is decreased to $${1 \over 2}$$, the potential difference V is increased to 2V, and the separation distance d is reduced to $${d \over 2}$$, then
A
the cut-off wavelength will reduce to half, and the wavelengths of the characteristic X-rays will remain the same
B
the cut-off wavelength as well as the wavelengths of the characteristic X-rays will remain the same
C
the cut-off wavelength will reduce to half, and the intensities of all the X-rays will decrease
D
the cut-off wavelength will become two times larger, and the intensity of all the X-rays will decrease
2
JEE Advanced 2020 Paper 2 Offline
MCQ (More than One Correct Answer)
+4
-2
Change Language
Two identical non-conducting solid spheres of same mass and charge are suspended in air from a common point by two non-conducting, massless strings of same length. At equilibrium, the angle between the strings is $$\alpha$$. The spheres are now immersed in a dielectric liquid of density 800 kg m$$-$$3 and dielectric constant 21. If the angle between the strings remains the same after the immersion, then
A
electric force between the spheres remains unchanged
B
electric force between the spheres reduces
C
mass density of the spheres is 840 kg m$$-$$3
D
the tension in the strings holding the spheres remains unchanged
3
JEE Advanced 2020 Paper 2 Offline
MCQ (More than One Correct Answer)
+4
-2
Change Language
Starting at time t = 0 from the origin with speed 1 ms-1, a particle follows a two-dimensional trajectory in the x-y plane so that its coordinates are related by the equation $$y = {{{x^2}} \over 2}$$. The x and y components of its acceleration are denoted by ax and ay, respectively. Then
A
ax = 1 ms-2 implies that when the particle is at the origin, ay = 1 ms-2
B
ax = 0 implies ay = 1 ms-2 at all times
C
at t = 0, the particle's velocity points in the x-direction
D
ax = 0 implies that at t = 1s, the angle between the particle's velocity and the x axis is 45$$^\circ$$
4
JEE Advanced 2020 Paper 2 Offline
Numerical
+4
-0
Change Language
A spherical bubble inside water has radius R. Take the pressure inside the bubble and the water pressure to be p0. The bubble now gets compressed radially in an adiabatic manner so that its radius becomes (R $$-$$ a). For a << R the magnitude of the work done in the process in given by (4$$\pi$$p0Ra2)X, where X is a constant and $$\gamma$$ = Cp/Cv = 41/30. The value of X is ________.
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