397 questions across 1 question group — pick any mix to generate a Physics paper with step-by-step answer keys.
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
A circular disc is placed in front of a narrow source. When the point of observation is at a distance of 1 meter from the disc, then the disc covers first HPZ. The intensity at this point is I0. The intensity at a point distance 25 cm from the disc will be
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(a) |
(b) |
(c) 
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(d) 
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Assertion : Short wave bands are used for transmission of ratio waves to a large distance
Reason : Short waves are reflected by ionosphere
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
| (d) If assertion is false but reason is true. |
An electromagnetic wave, going through vacuum is described by
. Which of the following is independent of wavelength
| (a) k | (b) w | (c) k/w | (d) kw |
A plane electromagnetic wave is incident on a material surface. If the wave delivers momentum p and energy E, then
| (a) p = 0, E = 0 | (b) p ¹ 0, E ¹ 0 | (c) p ¹ 0, E = 0 | (d) p = 0, E ¹ 0 |
In a two slit experiment with monochromatic light fringes are obtained on a screen placed at some distance from the sits. If the screen is moved by 5 
towards the slits, the change in fringe width is 3 
. If separation between the slits is 
, the wavelength of light used is
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(a) 6000 Å |
(b) 5000 Å |
(c) 3000 Å |
(d) 4500 Å |
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