- AWave like behaviour of light.
- BParitcle like behaviour of light.
- CBoth wavelike and paticle like behaviour.
- DNeither wave like nor particle like behaviour of light.
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From a newly formed radioactive substance (Half life 2 hours), the intensity of radiation is 64 times the permissible safe level. The minimum time after which work can be done safely from this source is
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(a) 6 hours |
(b) 12 hours |
(c) 24 hours |
(d) 128 hours |
A voltmeter having a resistance of 998 ohms is connected to a cell of e.m.f. 2 volt and internal resistance 2 ohm. The error in the measurement of e.m.f. will be
|
(a) 4 |
(b) 2 |
(c) 4 |
(d) 2 |
In a P-type semi-conductor, germanium is dopped with
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(a) Gallium |
(b) Boron |
(c) Aluminium |
(d) All of these |
A capacitor having capacitance C is charged to a voltage V. It is then removed and connected in parallel with another identical capacitor which is uncharged. The new charge on each capacitor is now
|
(a) CV |
(b) CV / 2 |
(c) 2 CV |
(d) CV / 4 |
The graph Shows the variation in magnetic flux ∅(t) with time through a coil. Which of the statements given below is not correct

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(a) There is a change in the direction as well as magnitude of the induced emf between B and D |
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(b) The magnitude of the induced emf is maximum between B and C |
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(c)There is a change in the direction as well as magnitude of induced emf between A and C |
|
(d) The induced emf is zero at B |
Assertion : Photoelectric effect demonstrates the wave nature of light.
Reason : The number of photoelectrons is proportional to the frequency of light.
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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. |