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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.
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 |
57%
From NCERT
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Given below are two statements:
| Statement I: | Electromagnetic waves propagate through all media with a speed \(c=\frac{1}{\sqrt{\varepsilon_0\mu_0}}.\) |
| 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 |
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) | 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 answer from the options given below:
| 1. | (a) – (iii), (b) – (iv), (c) – (ii), (d) – (i) |
| 2. | (a) – (iii), (b) – (i), (c) – (ii), (d) – (iv) |
| 3. | (a) – (iv), (b) – (iii), (c) – (ii), (d) – (i) |
| 4. | (a) – (iii), (b) – (iv), (c) – (i), (d) – (ii) |
Subtopic: Electromagnetic Spectrum |
78%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
Given below are two statements:
In light of the above statements choose the correct answer from the options given below:
| 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. |
In light of the above statements choose the correct answer from the options given below:
| 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 |
60%
From NCERT
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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 |
67%
From NCERT
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What is the cause of “Greenhouse effect”?
1. Infra-red rays
2. Ultraviolet rays
3. X-rays
4. Radio waves
Subtopic: Electromagnetic Spectrum |
61%
From NCERT
AIPMT - 2002
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Which of the following has the minimum wavelength?
1. X-rays
2. Ultraviolet rays
3. γ-rays
4. Cosmic rays
Subtopic: Electromagnetic Spectrum |
From NCERT
AIPMT - 2002
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If \(\lambda_{\mathrm{v}}, \lambda_{\mathrm{x}},\) and\(\lambda_\mathrm{m}\) represent the wavelengths of visible light, x-rays and microwaves respectively, then:
1. \( \lambda_{\mathrm{m}}>\lambda_{\mathrm{x}}>\lambda_{\mathrm{v}} \)
2. \( \lambda_\mathrm{v}>\lambda_\mathrm{m}>\lambda_\mathrm{x } \)
3. \( \lambda_\mathrm{v}>\lambda_\mathrm{x}>\lambda_\mathrm{m }\)
4. \(\lambda_{\mathrm{m}}>\lambda_{\mathrm{v}}>\lambda_{\mathrm{x}}\)
Subtopic: Electromagnetic Spectrum |
87%
From NCERT
AIPMT - 2005
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The frequency order for \(\gamma\) - rays (\(b\)), X – rays (\(a\)), and UV – rays (\(c\)) is:
| 1. | \( b>a>c \) | 2. | \( a>b>c \) |
| 3. | \( c>b>a \) | 4. | \( a>c>b\) |
Subtopic: Electromagnetic Spectrum |
81%
From NCERT
AIPMT - 2000
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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 |
77%
From NCERT
AIPMT - 2012
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