- ANot conserved.
- BConserved.
- CBoth a and b.
- DNone.
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Assertion : The capacity of a given conductor remains same even if charge is varied on it.
Reason : Capacitance depends upon nearly medium as well as size and shape of conductor.
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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 one is not the correct statement
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(a) 1 volt × 1 coulomb = 1 joule |
(b) 1 volt × 1 ampere = 1 joule/second |
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(c) 1 volt × 1 watt = 1 H.P. |
(d) Watt-hour can be expressed in eV |
Which of the following statements is not true
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(a) The resistance of intrinsic semiconductors decrease with increase of temperature |
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(b) Doping pure Si with trivalent impurities give P-type semiconductors |
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(c) The majority carriers in N-type semiconductors are holes |
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(d) A PN-junction can act as a semiconductor diode |
What is the effective capacitance between points X and Y
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(a) 24 μF |
(b) 18 μF |
(c) 12 μF |
(d) 6 μF |
In a dark room of photography, generally red light is used. The reason is
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(a) Most of the photographic films are not sensitive to red light |
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(b) The frequency for red light is low and hence the energy hv of photons is less |
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(c) (a) and (b) both |
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(d) None of the above |
Photon of 5.5 eV energy fall on the surface of the metal emitting photoelectrons of maximum kinetic energy 4.0 eV. The stopping voltage required for these electrons are
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(a) 5.5 V |
(b) 1.5V |
(c) 9.5V |
(d) 4.0V |
Two plates are 2 cm apart, a potential difference of 10 volt is applied between them, the electric field between the plates is
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(a) 20 N/C |
(b) 500 N/C |
(c) 5 N/C |
(d) 250 N/C |