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Q. No.To produce an instantaneous displacement current of \(2~\text{mA}\) in the space between the parallel plates of a capacitor of capacitance \(4~\mu\text{F}\), the rate of change of applied variable potential difference \(\left(\frac{dV}{dt}\right)\) must be:
1. \( 800~ \text{V} / \text{s} \)
2. \( 500~ \text{V} / \text{s} \)
3. \( 200~ \text{V} / \text{s} \)
4. \( 400 ~\text{V} / \text{s}\)
Subtopic: Displacement Current |
80%
From NCERT
NEET - 2023
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\(\varepsilon_0\) and \(\mu_0\) are the electric permittivity and magnetic permeability of free space respectively. If the corresponding quantities of a medium are \(2\varepsilon_0\) and \(1.5\mu_0\) respectively, the refractive index of the medium will nearly be:
1. \(\sqrt2\)
2. \(\sqrt3\)
3. \(3\)
4. \(2\)
1. \(\sqrt2\)
2. \(\sqrt3\)
3. \(3\)
4. \(2\)
Subtopic: Properties of EM Waves |
81%
From NCERT
NEET - 2023
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An electromagnetic wave of frequency \(\nu=3.0\) MHz passes from a vacuum into a dielectric medium with relative permittivity \(\varepsilon =4.0.\) Then:
| 1. | wavelength is doubled and frequency becomes half |
| 2. | wavelength is halved and frequency remains unchanged |
| 3. | wavelength and frequency both remain unchanged |
| 4. | wavelength is doubled and frequency unchanged |
Subtopic: Properties of EM Waves |
73%
From NCERT
NEET - 2013
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NEET 2025 - Target Batch
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\(\alpha\)- particles, \(\beta\)-particles and \(\gamma\)-rays are all having the same energy. Their penetrating power in a given medium in increasing order will be:
1. \(\gamma , \alpha, \beta \)
2. \( \alpha, \beta , \gamma \)
3. \( \beta, \alpha , \gamma \)
4. \(\beta, \gamma, \alpha \)
1. \(\gamma , \alpha, \beta \)
2. \( \alpha, \beta , \gamma \)
3. \( \beta, \alpha , \gamma \)
4. \(\beta, \gamma, \alpha \)
Subtopic: Properties of EM Waves |
75%
From NCERT
NEET - 2013
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Light wave is travelling along the \(y\text-\)axis. The electric field vector \(\vec{E}\) is along the \(x\text-\)axis. The corresponding direction of magnetic field vector \(\vec{B}\) will be along the:
1. \(y\text-\)axis
2. \(-x\text-\)axis
3. \(+z\text-\)axis
4. \(-z\text-\)axis
1. \(y\text-\)axis
2. \(-x\text-\)axis
3. \(+z\text-\)axis
4. \(-z\text-\)axis
Subtopic: Properties of EM Waves |
64%
From NCERT
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If the total energy of electromagnetic waves falling on a surface is \(E,\) for total absorption, the momentum delivered will be: (where \(c\) is the speed of light)
1. \(E/c\)
2. \(2E/c\)
3. \(4E/c\)
4. \(E/2c\)
1. \(E/c\)
2. \(2E/c\)
3. \(4E/c\)
4. \(E/2c\)
Subtopic: Properties of EM Waves |
75%
From NCERT
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Which of the following statement is not correct?
| 1. | Electromagnetic waves can be diffracted, refracted and polarised. |
| 2. | Electromagnetic waves carry both energy and momentum. |
| 3. | Electromagnetic waves exert radiation pressure. |
| 4. | Material medium is required for the propagation of electromagnetic waves. |
Subtopic: Properties of EM Waves |
84%
From NCERT
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The velocity of electromagnetic waves in a material medium is \(\dfrac{c}{\sqrt{2}}~\left(c=3 \times 10^8 ~\text{m/s} \right)\). Its permeability is nearly equal to the free space permeability, \(\mu_0\). Its permittivity \(\varepsilon\) is:
(\(\varepsilon_0\) is free space permittivity)
(\(\varepsilon_0\) is free space permittivity)
| 1. | \(\sqrt 2 \varepsilon_0\) | 2. | \(2\varepsilon_0\) |
| 3. | \(1.5\varepsilon_0\) | 4. | \(3\varepsilon_0\) |
Subtopic: Properties of EM Waves |
70%
From NCERT
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During the propagation of the electromagnetic wave in a medium:
| 1. | electric energy density is double the magnetic energy density. |
| 2. | electric energy density is half the magnetic energy density. |
| 3. | electric energy density is equal to magnetic energy density. |
| 4. | the electric energy density & magnetic energy density are not related to each other. |
Subtopic: Properties of EM Waves |
87%
From NCERT
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Match List–I with List–II.
Choose the correct answer from the options given below:
| List-I | List-II | ||
| (A) | UV rays | (I) | Diagnostic tool is medicine |
| (B) | X-rays | (II) | Water purification |
| (C) | Microwave | (III) | Communication, Radar |
| (D) | Infrared wave | (IV) | Improving visibility on foggy days |
Choose the correct answer from the options given below:
| 1. | A-III, B-II, C-I, D-IV |
| 2. | A-II, B-I, C-III, D-IV |
| 3. | A-II, B-IV, C-IIII, D-I |
| 4. | A-III, B-I, C-II, D-IV |
Subtopic: Electromagnetic Spectrum |
85%
From NCERT
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