Which statement is correct
|
(a) N-type germanium is negatively charged and P-type germanium is positively charged |
|
(b) Both N-type and P-type germanium are neutral |
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(c) N-type germanium is positively charged and P-type germanium is negatively charged |
|
(d) Both N-type and P-type germanium are negatively charged |
(b) Both N-type and P-type germanium are neutral
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In P-type semiconductor the majority and minority charge carriers are respectively
|
(a) Protons and electrons |
(b) Electrons and protons |
|
(c) Electrons and holes |
(d) Holes and electrons |
Two point charges +3μC and +8μC repel each other with a force of 40N. If a charge of -5μC is added to each of them, then the force between them will become
|
(a) - 10 N |
(b) +10 N |
(c) +20 N |
(d) - 20N |
The PN junction diode is used as
| (a) An amplifier | (b) A rectifier | (c) An oscillator | (d) A modulator |
The fine powder of a coloured glass is seen as
|
(a) Coloured |
(b) White |
|
(c) That of the glass colour |
(d) Black |
Point charge 
and 
are kept at points x = 0 and x = 6 respectively. Electrical potential will be zero at points
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(a) x = 2 and x = 9 |
(b) x = 1 and x = 5 |
(c) x = 4 and x = 12 |
(d) x = -2 and x = 2 |
The resistor of resistance 'R' is connected to 25 V supply and heat produced in it is 25 J/sec. The value of R is
|
(a) 225 Ω |
(b) 1 Ω |
(c) 25 Ω |
(d) 50 Ω |
Assertion : Magnetic flux can produce induced e.m.f.
Reason : Faraday established induced e.m.f. experimentally.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If assertion is false but reason is true. |
The de-Broglie wavelength is proportional to
|
(a) λ ∝ |
(b) λ ∝ |
(c) λ ∝ |
(d) λ ∝ p |
