Technical Officer, SCERT • 2025 • Paper-I
In Superposition network theorem, while considering a source, all other voltage sources are-
A)
open circuited
B)
short circuited
C)
change its position
D)
removed from the circuit
Option B is correct: short circuited.
Technical Officer, SCERT • 2025 • Paper-I
For MOSFET the drain current is varied by-
A)
Gate to source voltage
B)
Gate current
C)
Source Voltage
D)
None of the mentioned
Option A is correct: Gate to source voltage.
Technical Officer, SCERT • 2025 • Paper-I
In an RLC parallel circuit, the impedance at resonance is-
A)
maximum
B)
minimum
C)
zero
D)
infinity
Option A is correct: maximum.
Technical Officer, SCERT • 2025 • Paper-I
Find the Fourier transform of x(t) = δ(t-2) + δ(t + 2).
A)
2F(ω)cos2ω
B)
3F(ω)cos2ω
C)
2F(ω)sin2ω
D)
3F(ω)sin2ω
Option A is correct: 2F(ω)cos2ω.
Technical Officer, SCERT • 2025 • Paper-I
Kirchhoff’s Current law is based on the law of conservation of
A)
energy
B)
momentum
C)
mass
D)
charge
Option D is correct: charge.
Technical Officer, SCERT • 2025 • Paper-I
For a pure capacitor, the voltage current relationship is-
A)
current lags voltage by 90°
B)
current leads voltage by 180°
C)
voltage lags current by 90°
D)
voltage leads current by 90°
Option C is correct: voltage lags current by 90°.
Technical Officer, SCERT • 2025 • Paper-I
The threshold voltage of an n-channel MOSFET can be increased by-
A)
increasing channel dopant concentration
B)
reducing channel dopant concentration
C)
reducing gate oxide thickness
D)
reducing channel length
Option A is correct: increasing channel dopant concentration.
Technical Officer, SCERT • 2025 • Paper-I
n-Channel FETs are superior to p-channel FETs because-
A)
they have higher input impedance
B)
they have high switching time
C)
they consume less power
D)
mobility of electrons is greater than holes
Option D is correct: mobility of electrons is greater than holes.
Technical Officer, SCERT • 2025 • Paper-I
The barrier voltage for a PN junction for germanium is about
A)
0.3V
B)
3.5V
C)
3V
D)
Zero
Option A is correct: 0.3V.
Technical Officer, SCERT • 2025 • Paper-I
A causal LTI system is described by the difference equation 2y(n) = ay(n-2) - 2x(n) + Bx(n-1), where x(n) is the input and y(n) is the output sequence. The system is stable only if-
A)
|a|≠2, |A|<2
B)
|a|<2, |A|<2
C)
|a|<2, any value of B
D)
A|<2, any value of a
Option C is correct: |a|<2, any value of B.
Technical Officer, SCERT • 2025 • Paper-I
Kirchoff’s voltage/current laws fail in case of-
A)
linear networks
B)
distributed networks
C)
dual networks
D)
nonlinear networks
Option B is correct: distributed networks.
Technical Officer, SCERT • 2025 • Paper-I
Which of the following is an impurity added in a semiconductor to make it a N-Type semiconductor?
A)
Indium
B)
Gallium
C)
Boron
D)
Antimony
Option D is correct: Antimony.
Technical Officer, SCERT • 2025 • Paper-I
CMOS inverter has output impedance.
A)
low
B)
high
C)
very high
D)
none of the mentioned
Option A is correct: low.
Technical Officer, SCERT • 2025 • Paper-I
Which of the following materials has the highest value of dielectric constant?
A)
Glass
B)
Vacuum
C)
Ceramics
D)
Oil
Option C is correct: Ceramics.
Technical Officer, SCERT • 2025 • Paper-I
The metallic plates in capacitor are separated by :
A)
Vacuum
B)
Dielectric medium
C)
Air medium
D)
Water medium
Option B is correct: Dielectric medium.
Technical Officer, SCERT • 2025 • Paper-I
The Silicon Controlled Rectifier (SCR) is a ____ device
A)
Unidirectional
B)
Bidirectional
C)
Tridirectional
D)
Multidirectional
Option A is correct: Unidirectional.
Technical Officer, SCERT • 2025 • Paper-I
In the Hall effect, electrons experience -
A)
Electrostatic force
B)
Magnetic force
C)
Lorentz force
D)
All the above
Option D is correct: All the above.
Technical Officer, SCERT • 2025 • Paper-I
Comment on the causality of the following discrete time system: y(n) = x[-n].
A)
Causal
B)
Non causal
C)
Both Casual and Non casual
D)
None of the mentioned
Option B is correct: Non causal.
Technical Officer, SCERT • 2025 • Paper-I
The transfer function of a system is given as H(s) = (2s^2 - s - 6) / ((s^2 + 2s + 1)(s - 4)). The poles (P) and zeroes (Z) are-
A)
P=1, 1/2; Z= 1/2, 3/2
B)
P=-1, 1, -3/2; Z= 2, -1/2
C)
P=1, 0, -1/2; Z=-2, -1/2
D)
P=-1, -1, 4; Z = 2, -3/2
Option D is correct: P=-1, -1, 4; Z = 2, -3/2.
Technical Officer, SCERT • 2025 • Paper-I
Two ports containing no sources in their branches are called-
A)
active ports
B)
passive ports
C)
one port
D)
three port
Option B is correct: passive ports.
Technical Officer, SCERT • 2025 • Paper-I
FETs are preferred to BJTs at high frequencies because they are -
A)
Less noisy
B)
Capable of handling highest frequencies
C)
Easy to fabricate
D)
All of the above
Option D is correct: All of the above.
