MH 12th Question Paper 2025 Electronics Paper-1

Maharashtra Board

Question Paper
2025
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QUESTION PAPER
Presented By

DAY -a SEAT NUMBER

2025 III 04 1100
vs3 (E)

ELECTRONICS
PAPBR r (C-2)
Time : 3 Hours 4 Pages Max. Marks : 50

Instr.uctions .' (1) All questions are compulsory.
(2) Figures to the right indicate full martcs.
(3) Draw neat labelled diagrams wherever necessary.
(4) Use of logtable is allowed.

1. (A) Select correct alternatives from the following sub-question and rewrite the
complete sentences.
(a)Inafullwavebridgerectifiertheripplefrequencyis-. I
(i) fin
(ii) 2 fin
(iii) 3 fin
(iv) 4 fin
(b) Loud Speaker is a type of transducer. I
(i) Pressure
(ii) Temperature -
(iii) Electro acoustics \
(iv) None of these
(c) In fax machines for scanning _ are used. 1

(i) LEDs
(ii) LCDs
(iii) CCDs
(iv) None of these
v-s3l I IP.T.O.

(d) multivibrator is an oscillator. 1

(i) Astable
(ii) Bistable
(iii) Monostable
(iv) None of these
(B) Attempt any two of the following :

(?) Explain the working of centre-tap full wave rectifier with neat diagram
and wave-form. 3
(b) Explain the following parameters of an operational amplifier : 3
(i) Input bias current
(ii; CMRR
(iii; Drift
(c) Calculate the output pulse width for the timer used as monostable
multivibrator Given, R : I5Kf) and C : 0.22 pF. Find the value of C
if pulse width changes to 20 ms. 3
2. (A) Answer any two of the following :

(a). Draw labelled diagram of Cathode Ray Tube (CRT) and explain each
electrode in it. .3
(!)
t Explain with the help of circuit diagram, working of Inductor input
filt.r, when it is connected across the output terminals of a full-wave
rectifier. Draw it's output wave-form. 3
(c) Drau, block diagram IC 555. Explain function of each block. 3
(B) Attempt any one of the following :

(a) Draw a circuit diagram of an Inverting amplifier using Op-amplifier.
Explain concept of virtual ground and hence derive the expression
for it's output voltage. 4
(b) What is Amplitude Modulation ? State the expression for modulated
. wave and draw the waveform of modulated wave. 4
J. (A) Attempt any two of the following :

(a) With the help of Block diagram, explain the working of function
Generator. 3
(b) Draw the circuit diagram of a voltage regulator usin g Zener diode,
explain it's working. 3
(c) In an Op-Amp Inverting adder, V, : 0.2 volt, V, - 0.1 volt, V, :
0.4 volt, R, : I Kf), R, : 2 Kf), R, : 4 KO. Find the output voltage
if feed back resistance in 20 KO. 3

v-s3l 2 IContd.

(B) Attempt any one of the following :
(a) Explain the working of LVDT as a transducer. Draw neat diagram.
State it's two applications. 4

(b) What do you mean by Network Topology ? Explain Star, Ring and
Bus Topology. 4

4. (A) Attempt any two of the following :
(a) State any three front panel controls of CRO and give use of each
control. 3
(b) Explain rvith diergram and wave form working of R-C filter for
reducing ripple. 3

(c) Explain the working of differentiator circuit using operational amplifier.
Derive expression for output voltage. 3

(B) Attempt any one of the following :
(a) Draw basic circuit for Schmitt trigger using Op-Amp. and explain
the terms :
(i) IJTP

(iii) Hysteresis 4

(b) Draw a block-diagram showing basic elements of a Fiber Optical
' Communication System. Explain function of each block in brief. 4

5. (A) Attempt any two of the following :
(a) Explain electro-static focussing system of a CRT (Cathods Ray Tube). 3
(b) In Full Wave Recitier, if primary of transforrner is connected to 230Y.
50 Hz and secondary voltage is l2-0-12Y. 3
Calculate :
(i) Output DC voltage
(ii) Pry of the diode
(iii) Output ripple frequency
(c) Give any three advantages of FM over AM.
(Frequency Modulation and Amplitude Modulation) 3
(B) Attempt any one of the following :
(a) State Active Transducers. Explain Optocoupler. 4

(b) How Op-amplifier can be used as a Subtractor ? 4

OR
v-s3l 3 [P.T.O.

5 (A) Attempt any two of the following :
(a) Explain the use of CRO for measurement of phase 3
(b) Explain how Op-amplifier is used as a Buffer. Draw suitable circuit
diagram. 3
(c) Explain how IC 555 can be used as a Pulse Position Modulator (PPM). 3
(B) Attempt any one of the following :

(a) Explain any four characteristics of a Power Supply. 4

(b) Draw general block-di agram of a pulsed radar and explain function
of each block in brief. 4

2

Y-53t4

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