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. |
Statement I: | \(c=\frac{1}{\sqrt{\varepsilon_0\mu_0}}.\) | Electromagnetic waves propagate through all media with a speed
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. |
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 |
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) |
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. |
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 |
What is the cause of “Greenhouse effect”?
1. Infra-red rays
2. Ultraviolet rays
3. \(X\text-\)rays
4. Radio waves
Which of the following has the minimum wavelength?
1. \(X\text-\)rays
2. Ultraviolet rays
3. \(\gamma\text-\)rays
4. Cosmic rays
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. \(\lambda_{m}>\lambda_{v}>\lambda_{x}\)
1. | \( b>a>c \) | 2. | \( a>b>c \) |
3. | \( c>b>a \) | 4. | \( a>c>b\) |
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. |