Electronics Class 12 MCQ: Class 12 Physics MCQ Questions and Answer. Students get here all Important MCQ on Electronics Class 12.
Electronics Class 12 MCQ with Answers:
Multiple choice questions
1.) The forward resistance of the p-n junction r is
a)∆Vf/∆Vr
b)∆Vf/Ir
c)∆Vf/∆If.
d) ∆If/∆Vf
Ans : c) ∆Vf/∆If
2.) Conversion of alternating current into direct current is called.
a) Output voltage.
b) Rectification
c) Direct voltage.
d) Reconversion
Ans : b) Rectification
3.) The voltage which appears across load resistance R id is called.
a) Input voltage.
b) Direct voltage
c) Output voltage.
d) Indirect voltage.
Ans : c) Output voltage
4.) Fill in the blank.
A transistor consists of a single crystal of germanium or ______ which is grown in such a way that it has three regions.
a) Aluminium.
b) Gold
c) Silicon.
d) Silver
Ans : c) Silicon
5.) Current flow in n-p-n transistor the electric current IE can be expressed as.
a)IC+IB
b) IC-IB
c) ICIB
d)IC/IB
Ans : a) IC+IB
6.) When current flow in n-p-n transistor the ratio of collector current to base current is nearly_______.
a) Equal to zero
b) Equal to -1
c) Equal to constant
d) Equal to one
Ans : c) Equal to constant
7.) Current gain of transistor can be expressed as.
a)IC+IB
b) IC-IB
c) IC/IB
d) ICIB
Ans : c) IC/IB
8.) In a certain circuit the transistor has a collector current of 25 mA and base current of 65μA. What is the current gain of the transistor?
a)383.61
b) 384.61
c) 348.61
d) 483.61
Ans : b) 384.61
9.) The ratio of output voltage V to the voltage difference between non- inverting and inverting input when there is no external connection between the output and the inputs then it is known as.
a) Input resistance
b) Rectification
c) Open loop gain
d) Voltage gain
Ans : c) Open loop gain
10.) Open loop gain can be expressed as, AOL = _______
a)Vo/Vc
b) Vo/Vi
c) Vc/Vo
d) Vi/Vo
Ans : b) Vo/Vi
11.) The gain of amplifier can be expressed as, G
a)Vo/Vc.
b) Vc/Vo
c) Vo/Vin.
d) Vin/Vo
Ans : c) Vo/Vin
12.) The gain of the non inverting amplifier can be expressed as.
a)R1/R2
b)1+(R2/R1)
c) 1+(R1/R2).
d) -R1/R2
Ans : b) 1+(R2/R1)
13.) Complete the formula of reference voltage,VR =______×VCC
a)R1/(R1+R2).
b) R2/(R1+R2)
c) R3/(R1+R2)
d) R3/(R1+R3)
Ans : b) R2/(R1+R2)
14.) Complete the formula of potential drop across R3 is V’ = ______×VCC
a)R1/R1+R3
b) R3/R2+R3
c) R3/RL+R3
d) RL/RL+R3
Ans : c) R3/RL+R3
15.) The electronic circuits which implement the various logic operations are called.
a) Implement gate.
b) Logic gate
c) Voltage operation.
d) Electronic operation
Ans : b) Login gate
16.) If output of a logic gate is the sum of two inputs then that logic gate is called.
a)OR gate.
b) AND gate
c) NOT gate.
d) NOR gate
Ans : a) OR gate
17.) If output of logic gate is the multiple of two inputs then that logic gate is called.
a)OR gate.
b) AND gate
c) NOT gate.
d) NOR gate
Ans : b) AND gate
18.) If output of the logic gate is the compliment of the input then that logic gate is called.
a)OR gate.
b) AND gate
c) NOT gate.
d) NOR gate
Ans : c) NOT gate
19.) If the output of logic gate is the compliment of sum of the two inputs then that logic gate is called.
a)OR gate.
b) AND gate
c) NOT gate.
d) NOR gate
Ans : d) NOR gate
20.) If the output of the logic gate is the compliment of the product of the two inputs then that logic gate is called.
a)OR gate.
b) NAND gate
c) NOT gate.
d) NOR gate
And : b) NAND gate
21.) When an external potential difference is applied across a p-n junction such that p-side is positive and n-side is nagetive then it is called.
a) Forward biased
b) Reverse biased
c) Rectified
d) Half wave rectified
Ans : a) Forward biased
22.) When the external source of voltage is actually across a p-n junction such that it’s positive terminal is connected to n- region and its nagetive terminal to p- region the p-n junction is said to be.
a) Forward biased
B) Reverse biased
C) Rectified
d) Half wave rectified
Ans : b) Reverse biased
23.) When only one half of alternating current cycle is converted into direct current, it is called.
a) Full wave rectification
b) Half wave rectification
c) Half wave junction
d) Full wave junction
Ans : b) Half wave rectification
24.) Transistor is a semiconductor device consisting of three electrodes, namely emitter, base and collector. For normal operation the base-emitter junction is.
A) Reverse biased
b) Forward biased
c) Full wave rectified
d) Half wave rectified
Ans : b) Forward biased
For more updates follow our net explanations homepage