Technical Officer, SCERT ā¢ 2025 ā¢ Paper-II
The current flowing into one input of the op-amp is 12nA and it is 10 nA in the other. Find the input offset current.
A)
-2nA
B)
-1nA
C)
1nA
D)
2nA
Option D is correct: 2nA.
Technical Officer, SCERT ā¢ 2025 ā¢ Paper-II
Which type of oscillators are used in timing elements?
A)
Crystal oscillator
B)
Weinbridge oscillators
C)
LC oscillator
D)
RC oscillator
Option A is correct: Crystal oscillator.
Technical Officer, SCERT ā¢ 2025 ā¢ Paper-II
___ is used in operational amplifiers to obtain desired output waveform.
A)
Clipper
B)
Clamper
C)
Schmitt trigger
D)
Sample and Hold circuit
Option A is correct: Clipper.
Technical Officer, SCERT ā¢ 2025 ā¢ Paper-II
Frequency of oscillation in time domain correspond to:
A)
Resonant frequency
B)
Cut-off rate
C)
Resonance peak
D)
Cut-off rate
Option A is correct: Resonant frequency.
Technical Officer, SCERT ā¢ 2025 ā¢ Paper-II
The representation of octal number (532.2)ā in decimal is
A)
(446.25)āā
B)
(246.25)āā
C)
(146.25)āā
D)
(346.25)āā
Option A is correct: (446.25)āā.
Technical Officer, SCERT ā¢ 2025 ā¢ Paper-II
The gain of an ideal oscillator is-
A)
0
B)
1
C)
ā
D)
More than 1
Option B is correct: 1.
Technical Officer, SCERT ā¢ 2025 ā¢ Paper-II
The steady state error of a type one second order system to unit ramp input is-
A)
2/K
B)
1/K
C)
0
D)
ā
Option B is correct: 1/K.
Technical Officer, SCERT ā¢ 2025 ā¢ Paper-II
In a multiplexer, the selection of a particular input line is controlled by
A)
Data controller
B)
Selected lines
C)
Logic gates
D)
Both data controller and selected lines
Option B is correct: Selected lines.
Technical Officer, SCERT ā¢ 2025 ā¢ Paper-II
The radiation resistance and loss resistance of an antenna are 60Ī© and 15Ī© respectively. If the gain of the antenna is 16, its directivity is
A)
4
B)
12.8
C)
20
D)
64
Option C is correct: 20.
Technical Officer, SCERT ā¢ 2025 ā¢ Paper-II
Which of the following class has the poorest linearity and cannot be used for audio frequency amplification?
A)
Class A
B)
Class B
C)
Class C
D)
Class AB
Option C is correct: Class C.
Technical Officer, SCERT ā¢ 2025 ā¢ Paper-II
The gain of a transistor amplifier falls at high frequencies due to the
A)
internal capacitance of the device
B)
coupling capacitor at the input
C)
skin effect
D)
coupling capacitor at the output
Option A is correct: internal capacitance of the device.
Technical Officer, SCERT ā¢ 2025 ā¢ Paper-II
For the characteristic equation sā“ + 5sĀ³ + 5sĀ² + 4s + k = 0, the system is stable if-
A)
4 < k < 0
B)
0 < k < 8
C)
2 < k < 0
D)
k > 0
Option B is correct: 0 < k < 8.
Technical Officer, SCERT ā¢ 2025 ā¢ Paper-II
Which of the following majorly determines the number of emitters in a TTL digital circuit?
A)
Noise immunity
B)
Propagation delay
C)
Fan-out
D)
Fan-in
Option D is correct: Fan-in.
Technical Officer, SCERT ā¢ 2025 ā¢ Paper-II
Which of the following boundary conditions is false?
A)
The tangential electric field is always continuous across the boundary between two media.
B)
The tangential magnetic field is always continuous across the boundary between two media.
C)
The normal displacement density is continuous across the boundary between two media except if one medium is a perfect electric conductor.
D)
The normal magnetic flux density is always continuous across the boundary between two media.
Option B is correct: The tangential magnetic field is always continuous across the boundary between two media..
Technical Officer, SCERT ā¢ 2025 ā¢ Paper-II
The input impedance (Zin) and the output impedance (Zout) of an ideal transconductance amplifier are-
A)
Zin=0, Zout=0
B)
Zin=ā, Zout=0
C)
Zin=ā, Zout=ā
D)
Zin=0, Zout=ā
Option C is correct: Zin=ā, Zout=ā.
Technical Officer, SCERT ā¢ 2025 ā¢ Paper-II
The benefit of Maxwell equation is that-
A)
Any parameter can be calculated
B)
Antenna can be designed
C)
Polarisation of the wave can be calculated
D)
Transmission line constants can be found
Option A is correct: Any parameter can be calculated.
Technical Officer, SCERT ā¢ 2025 ā¢ Paper-II
Divergence theorem relates-
A)
a closed surface integral to volume integral
B)
a closed loop integral to open surface integral
C)
an open loop integral to open surface integral
D)
an open surface integral to volume integral
Option A is correct: a closed surface integral to volume integral.
Technical Officer, SCERT ā¢ 2025 ā¢ Paper-II
Suppose the potential function is a step function. The equation that gets satisfied is
A)
Laplace equation
B)
Poisson equation
C)
Maxwell equation
D)
Ampere equation
Option B is correct: Poisson equation.
Technical Officer, SCERT ā¢ 2025 ā¢ Paper-II
In free space, the Poisson equation becomes
A)
Maxwell equation
B)
Ampere equation
C)
Laplace equation
D)
Steady state equation
Option C is correct: Laplace equation.
Technical Officer, SCERT ā¢ 2025 ā¢ Paper-II
What is the value of the maximum efficiency of the class B amplifier?
A)
10% to 20%
B)
20% to 40%
C)
50% to 70%
D)
None of the mentioned
Option C is correct: 50% to 70%.
Technical Officer, SCERT ā¢ 2025 ā¢ Paper-II
The output Y of a 2-bit comparator is logic 1 whenever the 2-bit input A is greater than the 2-bit input B. The number of combinations for which the output is logic 1, is -
A)
4
B)
6
C)
8
D)
10
Option B is correct: 6.
Technical Officer, SCERT ā¢ 2025 ā¢ Paper-II
CMOS logic dissipates ___ power than NMOS logic circuits.
A)
Less
B)
Equal
C)
More
D)
Very High
Option A is correct: Less.
Technical Officer, SCERT ā¢ 2025 ā¢ Paper-II
What is the efficiency of Class A amplifiers?
A)
10
B)
30 or less
C)
90 or less
D)
50
Option B is correct: 30 or less.
Technical Officer, SCERT ā¢ 2025 ā¢ Paper-II
Which of the following oscillator is will give most stable output oscillation frequency?
A)
Wein bridge oscillator
B)
Clapp oscillator
C)
Colpitts oscillator
D)
Crystal oscillator
Option D is correct: Crystal oscillator.
Technical Officer, SCERT ā¢ 2025 ā¢ Paper-II
Which of the following oscillators cannot be used in low-frequency oscillations?
A)
Wein bridge oscillators
B)
RC phase shift oscillators
C)
Colpitts oscillators
D)
RC oscillators
Option C is correct: Colpitts oscillators.
