In a full wave rectifiers, input ac current has a frequency ‘n’. The output frequency of current is
|
(a) n/2 |
(b) n |
(c) 2n |
(d) None of these |
(c) 2n
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What is the path difference of destructive interference
|
(a) nl |
(b) n(λ + 1) |
(c) |
(d) |
The half life of a radioactive element which has only 
of its original mass left after a lapse of 60 days is
|
(a) 12 days |
(b) 32 days |
(c) 60 days |
(d) 64 days |
Which of the following gates will have an output of 1
|
(a)
(a)
|
(b)
|
(c)
|
(d)
|
In the circuit shown in the figure, the current flowing in 2 Ω resistance
|
(a) 1.4 A |
(b) 1.2 A |
(c) 0.4 A |
(d) 1.0 A |
Assertion : A P-N photodiode is made from a semiconductor for which Eg = 2.8 eV. This photo diode will not detect the wavelength of 6000 nm.
Reason : A PN photodiode detect wavelength l if 
.
|
(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 the assertion and reason both are false. |
Which of the following statements concerning the depletion zone of an unbiased PN junction is (are) true
|
(a) The width of the zone is independent of the densities of the dopants (impurities) |
|
(b) The width of the zone is dependent on the densities of the dopants |
|
(c) The electric field in the zone is produced by the ionized dopant atoms |
|
(d) b, c |
The electrical circuits used to get smooth d.c. output from a rectifier circuit is called
|
(a) Filter |
(b) Amplifier |
(c) Full wave rectifier |
(d) Oscillator |
