- Aan inductor and a capacitor
- Ban inductor but no capacitor
- Ca capacitor but no inductor
- Dneither an inductor nor a capacitor
Explanation:
Answer: A an inductor and a capacitor, B neither an inductor nor a capacitor
Reactance in electrical and electronic systems is the opposition of a circuit element to a change of electric current or voltage.Ideally a resistor has zero reactance.
Therefore in a circuit, reactance can be zero either if there are no inductors and capacitors in the circuit, or the individual reactance of inductors and capacitors cancel each other, making net reactance zero.
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Assertion :
from the radioactive fall out from a nuclear bomb ends up in the bones of human beings through the milk consumed by them. It causes impairment of the production of red blood cells.
Reason : The energetics b-particles emitted in the decay of
damage the bone marrow.
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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. |
A magnet of magnetic moment 2
is aligned in the direction of magnetic field of 0.1 T. What is the net work done to bring the magnet normal to the magnetic field
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(a) 0.1 J |
(b) 0.2 J |
(c) 1 J |
(d) 2 J |
The current sensitivity of a moving coil galvanometer can be increased by
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(a) Increasing the magnetic field of the permanent magnet |
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(b) Increasing the area of the deflecting coil |
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(c) Increasing the number of turns in the coil |
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(d) a, b, c |
A current of 2 A passing through conductor produces 80 J of heat in 10 seconds. The resistance of the conductor is
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(a) 0.5 Ω |
(b) 2 Ω |
(c) 4 Ω |
(d) 20 Ω |
What will be the colour of sky as seen from the earth, if there were no atmosphere
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(a) Black |
(b) Blue |
(c) Orange |
(d) Red |
For what value of unknown resistance X, the potential difference between B and D will be zero in the circuit shown in the figure
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(a) 4 W |
(b) 6 W |
(c) 2 W |
(d) 5 W |
Basically, the product modulator is
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(a) An amplifier |
(b) A mixer |
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(c) A frequency separator |
(d) A phase separator |
Two resistances and
when connected in series and parallel with 120 V line, power consumed will be 25 W and 100 W respectively. Then the ratio of power consumed by
to that consumed by
will be
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(a) 1 : 1 |
(b) 1 : 2 |
(c) 2 : 1 |
(d) 1 : 4 |