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Q. No.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%
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The speed of electromagnetic waves is:
| 1. | higher in vacuum compared to other media. |
| 2. | lower in vacuum compared to other media. |
| 3. | independent of the medium. |
| 4. | lower in some media than in vacuum, and higher in others. |
Subtopic: Properties of EM Waves |
67%
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Maxwell's equation \(\oint\vec E\cdot d\vec l=\dfrac{-d\phi_B}{dt}\) is a statement of:
1. Ampere's law
2. Faraday's law of induction
3. Gauss' law of electricity
4. Gauss' law of magnetism
Subtopic: Maxwell's Equations |
60%
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About \(5\)% of the power of a \(100\) W light bulb is converted to visible radiation. What is the average intensity of visible radiation at a distance of \(1\) m from the bulb?
1. \(0.472\) W/m2
2. \(0.398\) W/m2
3. \(0.323\) W/m2
4. \(0.401\) W/m2
Subtopic: Particle Nature of Light |
63%
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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%
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A radio can tune in to any station in the \(7.5\) MHz to \(12\) MHz bands. What is the corresponding wavelength band?
1. \(40\) to \(25\) m
2. \(10\) to \(100\) m
3. \(50\) to \(60\) m
4. \(20\) to \(10\) m
Subtopic: Electromagnetic Spectrum |
75%
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The average electric field associated with the plane electromagnetic wave \(\vec E = E_0 \hat {i} \sin (wt - kz)\) is:
1. \(E_0 \hat i\)
2. \(\dfrac {E_0} { \sqrt 2}\) \(\hat i \)
3. \(\sqrt 2E_0 \hat i\)
4. zero
1. \(E_0 \hat i\)
2. \(\dfrac {E_0} { \sqrt 2}\) \(\hat i \)
3. \(\sqrt 2E_0 \hat i\)
4. zero
Subtopic: Properties of EM Waves |
55%
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A plane electromagnetic wave is incident on a material surface. The wave delivers momentum \(p\) and energy \(E.\) Then:
| 1. | \(p=0, E \neq0\) |
| 2. | \(p\neq0, E=0\) |
| 3. | \(p\neq0, E \neq0\) |
| 4. | \(p=0, E=0\) |
Subtopic: Generation of EM Waves |
79%
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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%
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Given below are two statements.
| Assertion (A): | Light can travel in vacuum whereas sound cannot. |
| Reason (R): | Light is an electromagnetic wave whereas sound is a mechanical wave. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Properties of EM Waves |
88%
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