12th Standard Syllabus & Materials
12th Standard
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Published on: 02/09/2022
QB365 provides a detailed and simple solution for every Possible Book Back Questions in Class 12 Physics Subject - Retirement and Death of a Partner, English Medium. It will help Students to get more practice questions, Students can Practice these question papers in addition to score best marks.
Download Tamil Nadu 12th Standard Physics question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Physics Test1.
The frequency range of 3 MHz to 30 MHz is used for ______.
Ground wave propagation
Space wave propagation
Sky wave propagation
Satellite communication
2.
The internationally accepted frequency deviation for the purpose of FM broadcasts ____________.
75 kHz
68 kHz
80 kHz
70 kHz
3.
The variation of frequency of carrier wave with respect to the amplitude of the modulating signal is called ______.
Amplitude modulation
Frequency modulation
Phase modulation
Pulse width modulation
4.
The signal is aff ected by noise in a communication system _____________.
At the transmitter
At the modulator
In the channel
At the receiver
5.
The output transducer of the communication system converts the radio signal into ________.
Sound
Mechanical energy
Kinetic energy
None of the above
6.
The output of the following circuit is 1 when the input ABC is______.
101
100
110
010
7.
The given electrical network is equivalent to ______.
AND gate
OR gate
NOR gate
NOT gate
8.
Which one of the following represents forward bias diode?
9.
The electrical series circuit in digital form is
AND
OR
NOR
NAND
10.
If the input to the NOT gate is A = 1011, its output is ______.
0100
1000
1100
0011
11.
12.
The specific characteristic of a common emitter amplifier is _______________.
High input resistance
Low power gain
Signal phase reversal
Low current gain
13.
When a transistor is fully switched on, it is said to be _________________.
Shorted
Saturated
Cut-off
Open
14.
The light emitted in an LED is due to ______.
Recombination of charge carriers
Reflection of light due to lens action
Amplification of light falling at the junction
Large current capacity
15.
The principle based on which a solar cell operates is______.
Diffusion
Recombination
Photovoltaic action
Carrier flow
16.
The zener diode is primarily used as ______.
Rectifier
Amplifier
Oscillator
Voltage regulator
17.
If a positive half-wave rectified voltage is fed to a load resistor, for which part of a cycle there will be current flow through the load?
00–900
900–1800
00–1800
00–3600
18.
A forward biased diode is treated as ________________.
An open switch with infinite resistance
A closed switch with a voltage drop of 0V
A closed switch in series with a battery voltage of 0.7V
A closed switch in series with a small resistance and a battery
19.
If a small amount of antimony (Sb) is added to germanium crystal,______.
it becomes a p-type semiconductor
the antimony becomes an acceptor atom
there will be more free electrons than hole in the semiconductor
its resistance is increased
20.
The barrier potential of a silicon diode is approximately, ______.
0.7 V
0.3 V
2.0 V
2.2 V
1.
Ground wave propagation: frequency less than 2 MHz
Sky wave propagation: 3 to 30 MHz
Space wave propagation: Above 30 MHz to 400 GHz
Satellite communication: uplink communication 6 GHz band downlink communication 4 GHz band
2.
(a)
75 kHz
3.
(b)
Frequency modulation
4.
(c)
In the channel
5.
(a)
Sound
6.
A = 1, B = 0, C = 1
y = A + B, y = (A + B).C
y = (1 + 0).1 ⇒ y = 1
7.
\(Y_1=\overline{A+B}, y_2=\overline{A+B}=A+B, y=\overline{A+B}\)
8.
(a)
9.
(a)
AND
10.
\(y=\overline{A}=\overline{1011}=0100\)
The Boolean expression for NOT gate, \(y=\bar{A}\)
11.
(d)
12.
(c)
Signal phase reversal
13.
(b)
Saturated
14.
(a)
Recombination of charge carriers
15.
(c)
Photovoltaic action
16.
(d)
Voltage regulator
17.
(c)
00–1800
18.
(d)
A closed switch in series with a small resistance and a battery
19.
(c)
there will be more free electrons than hole in the semiconductor
20.
(a)
0.7 V
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Tamilnadu Stateboard 12th Standard Subjects
Maths
Chemistry
Physics
Biology
Computer Science
Business Maths and Statistics
Economics
Commerce
Accountancy
History
Computer Applications
Biology
Computer Technology
Computer Applications
Computer Science
Business Maths and Statistics
Commerce
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Maths
Chemistry
Physics
Computer Technology
History
Accountancy
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