A model for the quantized motion of an electron in a uniform magnetic field \(B\) states that the flux passing through the orbit of the electron is \(n(h/e)\) where \(n\) is an integer, \(h\) is Planck's constant and \(e\) is the magnitude of the electron's charge. According to the model, the magnetic moment of an electron is its lowest energy state will be (\(m\) is the mass of the electron):
| 1. | \(\dfrac{heB}{\pi m}\) | 2. | \(\dfrac{heB}{2\pi m}\) |
| 3. | \(\dfrac{he}{\pi m}\) | 4. | \(\dfrac{he}{2\pi m}\) |
Subtopic: Magnetic Moment |
Level 3: 35%-60%
NEET - 2025
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\(AB\) is a part of an electrical circuit (see figure). The potential difference \(''V_{A}-V_{B}'',\) at the instant when current \(i=2~\text A\) and is increasing at a rate of \(1~\text{amp/second}\) is:
1. \(9~ \text{volts}\)
2. \(10~ \text{volts}\)
3. \(5~ \text{volts}\)
4. \(6~ \text{volts}\)
1. \(9~ \text{volts}\)
2. \(10~ \text{volts}\)
3. \(5~ \text{volts}\)
4. \(6~ \text{volts}\)
Subtopic: LR circuit |
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Level 3: 35%-60%
NEET - 2025
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To an AC power supply of \(220~\text V\) at \(50~\text{Hz},\) a resistor of \(20~\Omega,\) a capacitor of reactance \(25~\Omega\) and an inductor of reactance \(45~\Omega\) are connected in series. The corresponding current in the circuit and the phase angle between the current and the voltage is, respectively:
1. \(15.6~\text {A and} ~30^\circ\)
2. \(15.6~\text {A and} ~45^\circ\)
3. \(7.8~\text {A and} ~30^\circ\)
4. \(7.8~\text {A and} ~45^\circ\)
1. \(15.6~\text {A and} ~30^\circ\)
2. \(15.6~\text {A and} ~45^\circ\)
3. \(7.8~\text {A and} ~30^\circ\)
4. \(7.8~\text {A and} ~45^\circ\)
Subtopic: Different Types of AC Circuits |
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Level 3: 35%-60%
NEET - 2025
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A parallel plate capacitor made of circular plates is being charged such that the surface charge density on its plates is increasing at a constant rate with time. The magnetic field arising due to displacement current is:
| 1. | non-zero everywhere with a maximum at the imaginary cylindrical surface connecting the peripheries of the plates. |
| 2. | zero between the plates and non-zero outside. |
| 3. | zero at all places. |
| 4. | constant between the plates and zero outside the plates. |
Subtopic: Displacement Current |
Level 3: 35%-60%
NEET - 2025
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The electric field in a plane electromagnetic wave is given by \(E_z=60\cos(5x+1.5\times10^9t)~\text{V/m}.\) Then expression for the corresponding magnetic field is (here subscripts denote the direction of the field):
| 1. | \(B_z=60\cos(5x+1.5\times10^9t)~\text T\) |
| 2. | \(B_y=60\sin(5x+1.5\times10^9t)~\text T\) |
| 3. | \(B_y=2\times10^{-7}\cos(5x+1.5\times10^9t)~\text T\) |
| 4. | \(B_x=2\times10^{-7}\cos(5x+1.5\times10^9t)~\text T\) |
Subtopic: Properties of EM Waves |
58%
Level 3: 35%-60%
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In a certain camera, a combination of four similar thin convex lenses are arranged axially in contact. Then the power of the combination and the total magnification in comparison to the power \(( p )\) and magnification \(( m )\) for each lens will be, respectively -
| 1. | \(4 p\) and \(m^4\) | 2. | \(p^4\) and \(m^4\) |
| 3. | \(4 p\) and \(4 m\) | 4. | \(p^4\) and \(4 m\) |
Subtopic: Lenses |
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Level 3: 35%-60%
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A microscope has an objective of focal length \(2~\text{cm},\) eyepiece of focal length \(4~\text{cm}\) and the tube length of \(40~\text{cm}.\) If the distance of distinct vision of eye is \(25~\text{cm},\) the magnification in the microscope is:
| 1. | \(150\) | 2. | \(250\) |
| 3. | \(100\) | 4. | \(125\) |
Subtopic: Simple & Compound Microscope |
Level 3: 35%-60%
NEET - 2025
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An unpolarized light beam travelling in air is incident on a medium of refractive index \(1.73\) at Brewster's angle. Then:
| 1. | both reflected and transmitted light are perfectly polarized with angles of reflection and refraction close to \(60^\circ\) and \(30^\circ,\) respectively. |
| 2. | transmitted light is completely polarized with angle of refraction close to \(30^\circ\) |
| 3. | reflected light is completely polarized and the angle of reflection is close to \(60^\circ\) |
| 4. | reflected light is partially polarized and the angle of reflection is close to \(30^\circ\) |
Subtopic: Polarization of Light |
52%
Level 3: 35%-60%
NEET - 2025
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The intensity of transmitted light when a polaroid sheet, placed between two crossed polaroids at \(22.5^\circ\) from the polarization axis of one of the polaroids, is (\(I_0\) is the intensity of polarised light after passing through the first polaroid):
| 1. | \(\dfrac{I_0}{8}\) | 2. | \(\dfrac{I_0}{16}\) |
| 3. | \(\dfrac{I_0}{2}\) | 4. | \(\dfrac{I_0}{4}\) |
Subtopic: Polarization of Light |
Level 3: 35%-60%
NEET - 2025
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Which of the following options represents the variation of photoelectric current with the property of light shown on the \(x \text{-}\)axis?
| (A) |  |
(B) |  |
| (C) |  |
(D) |  |
| 1. | (A) and (D) | 2. | (B) and (D) |
| 3. | (A) only | 4. | (A) and (C) |
Subtopic: Photoelectric Effect: Experiment |
51%
Level 3: 35%-60%
NEET - 2025
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