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Physics Past Paper MCQs
Physics-II 2024 MCQs
1 / 20
A conducting sphere of radius R carries a charge Q. Another conducting sphere has a radius R/2 but carries the same charge. The spheres are far apart. The ratio of the electric field near the surface of the smaller sphere to the field near the surface of the larger sphere is most nearly:
2 / 20
The probability of finding an electron is uniform in every direction in which orbital?
s-orbitals are spherically symmetric, meaning the electron probability density is the same in all directions.
p, d, and f orbitals have directional dependence (lobes and nodes).
3 / 20
A hollow metal sphere of radius R is positively charged. Of the following distances from the centre of the sphere, which location will have the greatest electric field strength?
4 / 20
A Gaussian surface in the form of a cylinder of radius R is immersed in a uniform electric field with the cylinder axis parallel to the field. What is the flux of the electric field through this closed surface?
The electric flux through a closed surface is given by Gauss's Law: Φ=∮E⋅dA.
Since the cylinder is immersed in a uniform electric field parallel to its axis, the field lines enter one end and exit the other end symmetrically.
The net flux through the curved surface is zero because EE and dAdA are perpendicular.
The flux through the two circular faces cancels out (equal in magnitude but opposite in sign).
Thus, the total flux is zero.
5 / 20
6 / 20
A parallel plate capacitor is charged by connection to a battery. If the battery is disconnected and the separation between the plates is increased, what will happen to the charge on the capacitor and the voltage across it?
7 / 20
Two identical coaxial coils P and Q carrying equal amounts of current in the same direction are brought nearer. The current in:
When two coils with parallel currents are brought closer, their mutual inductance increases, causing an opposing induced current (Lenz’s law).
This leads to a decrease in current in both coils.
8 / 20
If the only force acting on an electron is due to a uniform electric field, the electron moves with constant:
9 / 20
An ion with charge q, mass m, and speed v enters a magnetic field B and is deflected into a path with a radius of curvature R. If a second ion has speed 2v, while m, q, and B are unchanged, what will be the radius of the second ion’s path?
10 / 20
A positive charge of 3.0×10−8 C is placed in an upward-directed uniform electric field of 4.0×104 N/C. When the charge is moved 0.5 meters upward, the work done by the electric force on the charge is:
11 / 20
The Ampere law is based on which theorem?
12 / 20
The degeneracy of the state having energy 27h2/𝜋mL2 for a particle in a three-dimensional cubic box of length L is:
13 / 20
An isolated capacitor with air between its plates has a potential difference V0 and a charge Q0. After the space between the plates is filled with oil, the difference in potential is V and the charge is Q. Which of the following pairs of relationships is correct?
14 / 20
The differential form of Gauss’s law in magnetostatics is:
Gauss’s law for magnetism states that magnetic monopoles do not exist, meaning magnetic field lines are continuous and form closed loops.
Mathematically, it is expressed as ∇⋅B=0 (divergence of the magnetic field is zero).
Option (A) refers to Ampère’s law (∇×B=μJ), and (C) is incorrect.
15 / 20
Which of the following is the correct expression for the group velocity?
16 / 20
Two parallel conducting plates are connected to a constant voltage source. The magnitude of the electric field between the plates is 2,000 N/C. If the voltage is doubled and the distance between the plates is reduced to 1/5 the original distance, the magnitude of the new electric field is:
17 / 20
The Eigen value of a particle in a box is:
18 / 20
An alpha particle having energy 5 MeV enters the proportional counter with a capacity of 25 pF. The ionization potential is ~15 eV. The resultant pulse height will be close to:
19 / 20
In an electromagnetic wave in free space, the root mean square value of the electric field is 6 V/m. The peak value of the magnetic field is:
20 / 20
In an electromagnetic wave, the electric field of amplitude 6.2 V/m oscillates with a frequency of 2.4×1010 Hz. The Energy density of the wave is:
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