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Q. No.Which is more energetic: an infrared wave or a microwave?
1.
infrared wave
2.
microwave
3.
both have the same energy
4.
it cannot be predicted
Subtopic: Electromagnetic Spectrum |
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Level 1: 80%+
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A parallel plate capacitor with capacitance \(C\) is connected to a battery of voltage \(V_0.\) A closed Gaussian surface is shown by the dotted boundary in the diagram. What is the electric flux through this surface?
| 1. | \(\dfrac{2CV_0}{\varepsilon_0}\) | 2. | \(\dfrac{CV_0}{\varepsilon_0}\) |
| 3. | \(\dfrac{CV_0}{2\varepsilon_0}\) | 4. | \(\dfrac{3CV_0}{2\varepsilon_0}\) |
Subtopic: Displacement Current |
61%
Level 2: 60%+
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If electric field \(\left({\overrightarrow{E}}\right)\) at an instant is 6.6 N/C \(\hat j\) and the EM wave is propagating along positive x-direction then B at that instant is given by:
1. \(2.2\times 10^{-8}\hat kT\)
2. \(-2.2\times 10^{8}\hat kT\)
3. \(-0.5\times 10^{8}\hat kT\)
4. \(19.8\times 10^{8}\hat kT\)
1. \(2.2\times 10^{-8}\hat kT\)
2. \(-2.2\times 10^{8}\hat kT\)
3. \(-0.5\times 10^{8}\hat kT\)
4. \(19.8\times 10^{8}\hat kT\)
Subtopic: Properties of EM Waves |
87%
Level 1: 80%+
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In an EM wave ratio of average electric field and magnetic field energy density in a region of wave is equal to
1. \({{2\varepsilon_{0}}\over{\mu_{0}C^{2}}}\)
2. \({{C^{2}\varepsilon_{0}}\over{\mu_{0}}}\)
3. 1:1
4. \({{\varepsilon_{0}}\over{2\mu_{0}C^{2}}}\)
1. \({{2\varepsilon_{0}}\over{\mu_{0}C^{2}}}\)
2. \({{C^{2}\varepsilon_{0}}\over{\mu_{0}}}\)
3. 1:1
4. \({{\varepsilon_{0}}\over{2\mu_{0}C^{2}}}\)
Subtopic: Properties of EM Waves |
92%
Level 1: 80%+
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Match List-I with List-II and choose the correct option.
| List-I | List-II | ||
| (A) | Microwave | (p) | \(400 ~\text{nm} – 1 ~\text{nm}\) |
| (B) | Ultraviolet | (q) | \(1 ~\text{nm} – 1 ~\text{pm}\) |
| (C) | X-rays | (r) | \(2.5~\mu\text m – 750~\text{nm}\) |
| (D) | Infrared | (s) | \(1~\text{mm} – 25~\mu \text m\) |
| 1. | \(\mathrm{A\text-(s), B\text-(q), C\text-(r), D\text-(p)}\) |
| 2. | \(\mathrm{A\text-(s), B\text-(p), C\text-(q), D\text-(r)}\) |
| 3. | \(\mathrm{A\text-(p), B\text-(s), C\text-(q), D\text-(r)}\) |
| 4. | \(\mathrm{A\text- (r), B\text- (q), C\text- (s), D\text-(p)}\) |
Subtopic: Electromagnetic Spectrum |
81%
Level 1: 80%+
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Which of the following electromagnetic waves has the highest energy?
1. \(\mathrm{X} \text-\)rays
2. Infrared
3. Microwaves
4. radio waves
1. \(\mathrm{X} \text-\)rays
2. Infrared
3. Microwaves
4. radio waves
Subtopic: Electromagnetic Spectrum |
84%
Level 1: 80%+
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Average energy density of an EM wave with electric field amplitude E0 and magnetic field amplitude B0 is equal to
\(\begin{align} & {{1}{.}\;\frac{1}{2}{\varepsilon}_{0}{E}_{0}^{2}}\\ & {{2}{.}\;\frac{{B}_{0}^{2}}{{\mathit{\mu}}_{0}}}\\ & {{3}{.}\;{\varepsilon}_{0}{E}_{0}^{2}}\\ & {{4}{.}\;\frac{1}{2}{\mathit{\mu}}_{0}{E}_{0}^{2}} \end{align} \)
\(\begin{align} & {{1}{.}\;\frac{1}{2}{\varepsilon}_{0}{E}_{0}^{2}}\\ & {{2}{.}\;\frac{{B}_{0}^{2}}{{\mathit{\mu}}_{0}}}\\ & {{3}{.}\;{\varepsilon}_{0}{E}_{0}^{2}}\\ & {{4}{.}\;\frac{1}{2}{\mathit{\mu}}_{0}{E}_{0}^{2}} \end{align} \)
Subtopic: Properties of EM Waves |
86%
Level 1: 80%+
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Which of the following shows time-varying magnetic field?
| 1. | Linearly varying |
| 2. | Permanent magnet |
| 3. | Antenna signal |
| 4. | Constant electric field |
Subtopic: Properties of EM Waves |
57%
Level 3: 35%-60%
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Match the types of radiation listed in Column-I with their corresponding applications in Column-II.
Codes:
| Column-I (Radiation) |
Column-II (Applications) |
||
| (A) | Ultraviolet rays | (I) | Physiotherapy |
| (B) | Infrared rays | (II) | Treatment of cancer |
| (C) | \(\mathrm{X}\)-rays | (III) | LASIK eye surgery |
| (D) | Microwave rays | (IV) | Aircraft navigation |
| 1. | A-IV, B-I, C-III, D-II |
| 2. | A-III, B-I, C-II, D-IV |
| 3. | A-II, B-I, C-IV, D-III |
| 4. | A-III, B-I, C-IV, D-II |
Subtopic: Electromagnetic Spectrum |
75%
Level 2: 60%+
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An electromagnetic wave beam of power \(20\) mW is incident on a perfectly absorbing body for \(300\) ns. The total momentum transferred by the beam to the body is equal to:
1. \(2\times 10^{-17}\) N-s
2. \(1\times 10^{-17}\) N-s
3. \(3\times 10^{-17}\) N-s
4. \(5\times 10^{-17}\) N-s
1. \(2\times 10^{-17}\) N-s
2. \(1\times 10^{-17}\) N-s
3. \(3\times 10^{-17}\) N-s
4. \(5\times 10^{-17}\) N-s
Subtopic: Properties of EM Waves |
78%
Level 2: 60%+
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