- AAmpere
- BPotential
- CWatt
- DVolt
Explanation:
EMF is defined as the voltage developed by the electrical energy source. For example : Battery Thus EMF has the unit of volt denoted by V
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
If the voltage of X-ray tube is doubled, the intensity of X-rays will become
|
(a) Half |
(b) Unchanged |
(c) Double |
(d) Four times |
Assertion : Photosensitivity of a metal is high if its work function is small.
Reason : Work function =
where
is the threshold frequency.
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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. |
Which of the following statement is true
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(a) Velocity of light is constant in all media |
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(b) Velocity of light in vacuum is maximum
|
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(c) Velocity of light is same in all reference frames |
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(d) Laws of nature have identical form in all reference frames |
Assertion : NOT gate is also called inverter circuit.
Reason : NOT gate inverts the input order.
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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. |
Half-life of a radioactive substance is 20 minutes. Difference between points of time when it is 33% disintegrated and 67% disintegrated is approximately
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(a) 10 min |
(b) 20 min |
(c) 30 min |
(d) 40 min |
In AM, the centpercent modulation is achieved when
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(a) Carrier amplitude = signal amplitude |
(b) Carrier amplitude ≠ signal amplitude |
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(c) Carrier frequency = signal frequency |
(d) Carrier frequency ≠ signal frequency |
The magnetic flux linked with a vector area
in a uniform magnetic field
is
|
(a) |
(b) AB |
(c) |
(d) |
A person uses spectacles of power +2D. He is suffering from
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(a) Short sightedness or myopia |
(b) Long sightedness or hypermetropia |
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(c) Presbyopia |
(d) Astigmatism |