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Q. No.Consider sunlight incident on a pinhole of width \(10^{3}~\mathring{{A}}\). The image of the pinhole seen on a screen shall be:
(a)
a sharp white ring
(b)
different from a geometrical image
(c)
a diffused central spot, white in colour
(d)
diffused coloured region around a sharp central white spot
Choose the correct option:
1. (a), (c)
2. (a), (d)
3. (b), (d)
4. (b), (c)
1. (a), (c)
2. (a), (d)
3. (b), (d)
4. (b), (c)
Subtopic: Â Diffraction |
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Consider the diffraction pattern for a small pinhole. As the size of the hole is increased:
| (a) | the size decreases | (b) | the intensity increases |
| (c) | the size increases | (d) | the intensity decreases |
| 1. | (a), (b) | 2. | (a), (c) |
| 3. | (b), (d) | 4. | (c), (d) |
Subtopic: Â Diffraction |
 56%
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For light diverging from a point source:
| (a) | the wavefront is spherical. |
| (b) | the intensity decreases in proportion to the distance squared. |
| (c) | the wavefront is parabolic. |
| (d) | the intensity at the wavefront does not depend on the distance. |
| 1. | (a), (b) | 2. | (a), (c) |
| 3. | (b), (c) | 4. | (c), (d) |
Subtopic: Â Huygens' Principle |
 82%
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Two Sources \(S_1\) and \(S_2 \) of intensity \(I_1\) and \(I_2\) are in front of a screen [Fig.(a)]. The pattern of intensity distribution seen in the central portion is given by Fig.(b).
In this case, which of the following statements are true?
| (a) | \(S_1\) and \(S_2\) have the same intensities. |
| (b) | \(S_1\) and \(S_2\) have a constant phase difference. |
| (c) | \(S_1\) and \(S_2\) have the same phase. |
| (d) | \(S_1\) and \(S_2\) have the same wavelength. |
Choose the correct option:
| 1. | (a), (b), (c) | 2. | (a), (b), (d) |
| 3. | (b), (c), (d) | 4. | (c), (d) |
Subtopic: Â Young's Double Slit Experiment |
 52%
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White light is used to illuminate the double slit in Young's double-slit experiment. Which of the following is/are true?
1. I only
2. I, II
3. I, III
4. I, II, III
| I. | The central fringe will be white. |
| II. | Closest bright fringe to the central fringe will be a violet fringe. |
| III. | There will not be any dark fringe. |
2. I, II
3. I, III
4. I, II, III
Subtopic: Â Young's Double Slit Experiment |
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With the increase in wavelength of the interfering beam, the fringe width in Young's double-slit experiment:
| 1. | decreases |
| 2. | increases |
| 3. | remains the same |
| 4. | can increase or can decrease |
Subtopic: Â Young's Double Slit Experiment |
 84%
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Given below are two statements:
| Assertion (A): | Radio waves can be polarised. |
| Reason (R): | Sound waves in air are longitudinal in nature. |
| 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: Â Polarization of Light |
 76%
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Light travels faster in the air than in glass. This is in accordance with:
| 1. | the wave theory of light. |
| 2. | the corpuscular theory of light. |
| 3. | neither (1) nor (2) |
| 4. | both (1) and (2) |
Subtopic: Â Huygens' Principle |
 58%
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Given below are two statements:
| Assertion (A): | To observe the diffraction of light the size of the obstacle/aperture should be of the order of 10-7 m. |
| Reason (R): | 10-7 m is the order of the wavelength of visible light. |
| 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: Â Diffraction |
 78%
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Given below are two statements:
| Assertion (A): | It is not possible to have interference between the waves produced by two violins. |
| Reason (R): | For interference of two waves the phase difference between the waves must remain constant.Given below are two statements. |
| 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: Â Superposition Principle |
 70%
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