CBSE
Multiple Choice QuestionsAssertion: In common base configuration, the current gain of the transistor is less than unity.
Reason: The collector terminal is reverse biased for amplification.
If both assertion and reason are true and reason is the correct explanation of the assertion
If both assertion and reason are true but reason is not the correct explanation of the assertion
If assertion is true, but reason is false
Both assertion and reason are false statements
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 is more sensitive to changes in incident light intensity.
If both assertion and reason are true and reason is the correct explanation of the assertion
If both assertion and reason are true but reason is not the correct explanation ofthe assertion
If assertion is true, but reason is false
Both assertion and reason are false statements
Which of the following logic gates is a universal gate?
OR
NOT
AND
NAND
Consider an n-p-n transistor amplifier in the common emitter configuration. The current gain of the transistor is 100. If the collector current changes by 1 mA, what will be the change in emitter current?
1.1 mA
1.01 mA
0.01 mA
10 mA
In a semiconductor material the mobilities of electrons and holes are μe and μn respectively. Which of the following is true?
μe > μn
μe < μn
μe = μn
μe< 0 ; μn > 0
The voltage gain of the following amplifier is
10
100
1000
9.9
Assertion: A diode lasers are used as optical sources in optical communication.
Reason: Diode lasers consume less energy.
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
Assertion: The logic gate NOT can be built using diode.
Reason: The output voltage and the input voltage of the diode have 180o phase difference.
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
Assertion: In a common emitter transistor amplifier the input current is much less than the output current.
Reason: The common emitter transistor amplifier has very high input 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.
The temperature (T) dependence of resistivity ( ρ ) of a semiconductor is represented by
