CBSE
Multiple Choice QuestionsThe circuit as shown in figure,
the equivalent gate is
NOR gate
OR gate
AND gate
NAND gate
Assertion: In a common emitter transistor amplifier, the input current is much less than the output current than output impedance.
Reason: The common emitter transistor amplifier has higher input impedance than output impedance.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
In an intrinsic semiconductor band gap is 1.2 eV then ratio of number of charge carriers at 600 K and 300 K is
104
107
105
103
The output for the given, circuit is
(A B) B
( A + B )B
( A B ) + B
Which of the given statements about transistor is not true?
Emitter is heavily doped.
Base is thin.
Base is lightly doped.
Collector region is smaller comparative to emitter in size.
Assertion: The resistance of a junction of a spoiled transistor is low when forward biased or reverse biased.
Reason: The resistance of a junction of a transistor in working order is high always.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.n
Assertion: A p-n junction with reverse bias can be used as a photo-diode to measure light intensity.
Reason: In a reverse bias condition the current is small but it is more sensitive to change in intensity of incident light.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Which logic gate is represented by the following, combination of logic gates in figure?
OR
NAND
AND
NOR
If the plate resistance oftriode valve is 13 x 106 Ω and amplification factor is 21. The mutual conductance will be
1.6 × 10-6 mho
1.6 × 106 mho
2.6 × 10-5 mho
2.6 × 105 mho
Assertion: The output voltage and the input voltage of the NOT gate have 180° phase difference.
Reason: The logic NOT can be built using diode.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
