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Q. No.Given below are two statements:
Statement I:
Electromagnetic waves are radiated when a charged particle undergoes SHM.
Statement II:
Electromagnetic waves propagate energy in the direction of the electric field of the wave.
Choose the correct option from the given ones:
1.
Statement I is incorrect and Statement II is correct.
2.
Both Statement I and Statement II are correct.
3.
Both Statement I and Statement II are incorrect.
4.
Statement I is correct and Statement II is incorrect.
Subtopic: Generation of EM Waves |
62%
Level 2: 60%+
Hints
Given below are two statements:
| Statement I: | Electromagnetic waves propagate through all media with a speed \(c=\dfrac{1}{\sqrt{\varepsilon_0\mu_0}}.\) |
| Statement II: | Electromagnetic waves can undergo reflection and refraction. |
| 1. | Statement I is incorrect and Statement II is correct. |
| 2. | Both Statement I and Statement II are correct. |
| 3. | Both Statement I and Statement II are incorrect. |
| 4. | Statement I is correct and Statement II is incorrect. |
Subtopic: Properties of EM Waves |
56%
Level 3: 35%-60%
Hints
Match List I with List II:
Choose the correct options from the given ones:
| List I | List II | ||
| (a) | Ultraviolet rays | (i) | Study crystal structure |
| (b) | Microwaves | (ii) | Greenhouse effect |
| (c) | Infrared waves | (iii) | Sterilizing surgical instrument |
| (d) | X-rays | (iv) | Radar system |
Choose the correct options from the given ones:
| 1. | \(\mathrm{(a)\rightarrow (iii), (b)\rightarrow(iv), (c) \rightarrow (ii), (d) \rightarrow(i)}\) |
| 2. | \(\mathrm{(a) \rightarrow (iii), (b) \rightarrow (i), (c) \rightarrow (ii), (d) \rightarrow(iv)}\) |
| 3. | \(\mathrm{(a) \rightarrow (iv), (b) \rightarrow (iii), (c) \rightarrow (ii), (d) \rightarrow (i)}\) |
| 4. | \(\mathrm{(a)\rightarrow (iii), (b) \rightarrow(iv), (c) \rightarrow (i), (d) \rightarrow (ii)}\) |
Subtopic: Electromagnetic Spectrum |
81%
Level 1: 80%+
JEE
Hints
Given below are two statements:
| Assertion (A): | Displacement current goes through the gap between the plates of a capacitor when the charge of the capacitor does not change. |
| Reason (R): | The displacement current arises in the region in which the electric field and hence the electric flux does not change with time. |
| 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: Displacement Current |
65%
Level 2: 60%+
Hints
Consider the following statements about electromagnetic waves and choose the correct ones:
| S1: | Electromagnetic waves having wavelengths \(1000\) times smaller than light waves are called X-rays. |
| S2: | Ultraviolet waves are used in the treatment of swollen joints. |
| S3: | Alpha and gamma rays are not electromagnetic waves. |
| S4: | de-Broglie waves are not electromagnetic in nature. |
| S5: | Electromagnetic waves exhibit polarization while sound waves do not. |
| 1. | S1, S4, and S5 |
| 2. | S3, S4, and S5 |
| 3. | S1, S3, and S5 |
| 4. | S2, S3 and S4 |
Subtopic: Properties of EM Waves |
70%
Level 2: 60%+
Hints
What is the cause of “Greenhouse effect”?
1. Infra-red rays
2. Ultraviolet rays
3. \(X\text-\)rays
4. Radio waves
Subtopic: Electromagnetic Spectrum |
62%
Level 2: 60%+
AIPMT - 2002
Hints
Links
Which of the following has the minimum wavelength?
1. \(X\text-\)rays
2. Ultraviolet rays
3. \(\gamma\text-\)rays
4. Cosmic rays
Subtopic: Electromagnetic Spectrum |
Level 3: 35%-60%
AIPMT - 2002
Hints
Links
If \(\lambda_{v}, \lambda_{x},\) and \(\lambda_{m}\) represent the wavelengths of visible light, \(x\text-\)rays and microwaves respectively, then:
1. \( \lambda_{m}>\lambda_{x}>\lambda_{v} \)
2. \( \lambda_{v}>\lambda_{m}>\lambda_{x } \)
3. \( \lambda_{v}>\lambda_{x}>\lambda_{m }\)
4. \(\lambda_{m}>\lambda_{v}>\lambda_{x}\)
Subtopic: Electromagnetic Spectrum |
89%
Level 1: 80%+
AIPMT - 2005
Hints
Links
The frequency order for \(\gamma\text-\)rays (\(b\)), \(X\text-\)rays (\(a\)), and \(UV\text-\)rays (\(c\)) is:
| 1. | \( b>a>c \) | 2. | \( a>b>c \) |
| 3. | \( c>b>a \) | 4. | \( a>c>b\) |
Subtopic: Electromagnetic Spectrum |
83%
Level 1: 80%+
AIPMT - 2000
Hints
Links
The ratio of the amplitude of a magnetic field to the amplitude of an electric field for an electromagnetic wave propagating in a vacuum is equal to:
| 1. | reciprocal of speed of light in vacuum. |
| 2. | the ratio of magnetic permeability to the electric susceptibility of vacuum. |
| 3. | unity. |
| 4. | the speed of light in a vacuum. |
Subtopic: Properties of EM Waves |
79%
Level 2: 60%+
AIPMT - 2012
Hints
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