- APlanck
- BHallwash
- CHertz
- DEinsterin
Explanation:
Photoelectric effect was successfully explained first by Einstein.
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Two electric bulbs whose resistances are in the ratio of 1 : 2 are connected in parallel to a constant voltage source. The powers dissipated in them have the ratio
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(a) 1 : 2 |
(b) 1 : 1 |
(c) 2 : 1 |
(d) 1 : 4 |
When two magnetic moments are compared using equal distance method the deflections produced are 45o and 30o. If the length of magnets are in the ratio 1 : 2, the ratio of their pole strengths is
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(a) 3 : 1 |
(b) 3 : 2 |
(c) |
(d) 2 |
Assertion : NAND or NOR gates are called digital building blocks.
Reason : The repeated use of NAND (or NOR) gates can produce all the basic or complicated gates.
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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. |
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(d) If the assertion and reason both are false. |
The retarding potential for having zero photo-electron current
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(a) Is proportional to the wavelength of incident light |
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(b) Increases uniformly with the increase in the wavelength of incident light |
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(c) Is proportional to the frequency of incident light |
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(d) Increases uniformly with the increase in the frequency of incident light wave |
If six identical cells each having an e.m.f. of 6V are connected in parallel, the e.m.f. of the combination is
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(a) 1 V |
(b) 36 V |
(c) |
(d) 6 V |
A magnifying glass is used, as the object to be viewed can be brought closer to the eye than the normal near point. This results in;