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) |
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. |
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. |
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-rays
4. Radio waves
Which of the following has the minimum wavelength?
1. X-rays
2. Ultraviolet rays
3. γ-rays
4. Cosmic rays
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. \(\lambda_{\mathrm{m}}>\lambda_{\mathrm{v}}>\lambda_{\mathrm{x}}\)
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. | \( a>c>b\) |
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. |