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Given below are two statements:
Assertion (A):
The fastest speed of propagation of any wave in any medium is the speed of electromagnetic waves in that medium.
Reason (R):
All signals can at most travel at the speed of light in a vacuum.
1.
(A) is True but (R) is False.
2.
(A) is False but (R) is True.
3.
Both (A) and (R) are True and (R) is the correct explanation of (A).
4.
Both (A) and (R) are True but (R) is not the correct explanation of (A).
Subtopic: Properties of EM Waves |
Level 3: 35%-60%
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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 |
70%
Level 2: 60%+
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Which of the following situation(s), can cause the radiation of an electromagnetic wave?
Choose the correct option from the given ones:
| (A) | a varying sinusoidal current flowing through a capacitor |
| (B) | an electric dipole, whose size (and magnitude) is oscillating with time |
| (C) | a steady current flowing through a toroid |
Choose the correct option from the given ones:
| 1. | only (A) |
| 2. | only (B) |
| 3. | only (A) & (B) |
| 4. | (A), (B), (C) |
Subtopic: Generation of EM Waves |
66%
Level 2: 60%+
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The region on the left of the \(y\)-axis \((x<0)\) represents vacuum, and the region on the right \((x>0)\) represents a transparent medium. An electromagnetic wave travelling along the \(x\)-axis given by:
\(\vec E_1(x,t)=E_1\hat j~\sin(\omega t-k_0x),\) where \(x<0,\)
is incident on to the medium on the right. The transmitted wave in the medium is:
\(\vec E_2(x,t)=E_2\hat j~\sin(\omega t-2k_0x),\) where \(x>0.\)
The refractive index of the medium is:
\(\vec E_1(x,t)=E_1\hat j~\sin(\omega t-k_0x),\) where \(x<0,\)
is incident on to the medium on the right. The transmitted wave in the medium is:
\(\vec E_2(x,t)=E_2\hat j~\sin(\omega t-2k_0x),\) where \(x>0.\)
The refractive index of the medium is:
| 1. | \(2\) | 2. | \(\sqrt2\) |
| 3. | \(4\) | 4. | \(2\sqrt2\) |
Subtopic: Properties of EM Waves |
67%
Level 2: 60%+
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Match List I with List II.
Choose the correct answer from the options given below:
| List - I (Electromagnetic waves) |
List - II (Wavelength) |
||
| (a) | AM radio waves | (i) | \(10^{-10}~\text{m}\) |
| (b) | Microwaves | (ii) | \(10^{2} ~\text{m}\) |
| (c) | Infrared radiation | (iii) | \(10^{-2} ~\text{m}\) |
| (d) | \(X\)-rays | (iv) | \(10^{-4} ~\text{m}\) |
Choose the correct answer from the options given below:
| (a) | (b) | (c) | (d) | |
| 1. | (ii) | (iii) | (iv) | (i) |
| 2. | (iv) | (iii) | (ii) | (i) |
| 3. | (iii) | (ii) | (i) | (iv) |
| 4. | (iii) | (iv) | (ii) | (i) |
Subtopic: Electromagnetic Spectrum |
74%
Level 2: 60%+
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Assertion: Like light radiation, thermal radiations are also electromagnetic radiation.
Reason: The thermal radiations require no medium for propagation.
1. Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
2. Both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.
3. Assertion is true but Reason is false.
4. Both Assertion and Reason are false.
Reason: The thermal radiations require no medium for propagation.
1. Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
2. Both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.
3. Assertion is true but Reason is false.
4. Both Assertion and Reason are false.
Subtopic: Properties of EM Waves |
Level 3: 35%-60%
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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 |
66%
Level 2: 60%+
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Assertion: If the earth did not have an atmosphere, its average surface temperature would be lower than what is now.
Reason: Greenhouse effect of the atmosphere would be absent if the earth did not have an atmosphere.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but the reason is false.
4. Both assertion and reason are false.
Reason: Greenhouse effect of the atmosphere would be absent if the earth did not have an atmosphere.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but the reason is false.
4. Both assertion and reason are false.
Subtopic: Properties of EM Waves |
75%
Level 2: 60%+
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
In the light of the above statements choose the correct answer from the options given below:
| Assertion (A): | The energy of \(X\text-\)ray photons is greater than that of light photons. |
| Reason (R): | \(X\text-\)ray photon in a vacuum travels faster than light photons. |
In the 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: Electromagnetic Spectrum |
61%
Level 2: 60%+
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
In the light of the above statements choose the correct answer from the options given below:
| Assertion (A): | For cooking in a microwave oven, food is always kept in metal containers. |
| Reason (R): | The energy of the microwave is easily transferred to the food in a metal container. |
In the 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: Electromagnetic Spectrum |
Level 3: 35%-60%
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