- AStop a signal.
- BInvert an input signal.
- CComplement a signal.
- DChange the logic in a digital circuit.
Explanation:
A NOT gate inverts the input signal which is the same as complementing a signal or changing the logic in a digital circuit. This means that when the input to the NOT gate is logic '0', the output is logic '1'. However, it does not stop a signal.
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Assertion : Current is passed through a metallic wire, heating it red. When cold water is poured on half of its portion, then rest of the half portion become more hot.
Reason : Resistances decreases due to decrease in temperature and so current through wire increases.
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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. |
If each resistance in the figure is of 9 W then reading of ammeter is
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(a) 5 A |
(b) 8 A |
(c) 2 A |
(d) 9 A |
At a place the earth's horizontal component of magnetic field is 0.36
. If the angle of dip at that place is 60o, then the vertical component of earth's field at that place in weber/m2 will be approximately
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(a) 0.12 |
(b) 0.24 |
(c) 0.40 |
(d) 0.62 |
Which of the following is used to produce radio waves of constant amplitude
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(a) Oscillator |
(b) FET |
(c) Rectifier |
(d) Amplifier |
A double star is a system of two stars rotating about their centre of mass only under their mutual gravitational attraction. Let the star have mass m and 2m and their separation be l. Their time period of rotation about their centre of mass will be proportional to
|
(a) |
(b) l |
(c) |
(d) |
If a high power heater is connected to electric mains, then the bulbs in the house become dim, because there is a
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(a) Current drop |
(b) Potential drop |
(c) No current drop |
(d) No potential drop |
An electron in the n = 1 orbit of hydrogen atom is bound by 13.6 eV energy is required to ionize it is
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(a) 13.6 eV |
(b) 6.53 eV |
(c) 5.4 eV |
(d) 1.51 eV |
A cell of e.m.f 1.5 V having a finite internal resistance is connected to a load resistance of 2Ω. For maximum power transfer the internal resistance of the cell should be
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(a) 4 ohm |
(b) 0.5 ohm |
(c) 2 ohm |
(d) None of these |