MH 12th Question Paper 2025 Electronics Paper-2

Maharashtra Board

Question Paper
2025
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QUESTION PAPER
Presented By

DAY - (9 SEAT NUMBER

202s ilI 06 1100
v-87 (E)

ELECTRONICS
PAPER rr (C-2)
Time : 3 Hours 4 Pages Max. Mar.ks : 50

Instructions .' (1) All questions are compulsory.
(2) Drsw neat labelled diagrams wherever necessary.
(3) Figures to the right indicate full marlcs.
(4) U,se of log table ts allowed.
I (A) Select correct alternatives from the following sub-questions and rewrite the
complete sentences :
(a)Thelargest4-bitbinarynumberusedinBCDCodeis 1

(i) l0l0
(ii) 1001
(iii) lrlr
(iv) 1000
(b) In Boolean Algebra A O A is always equal to _. I
(i) 1

(ii) 0
(iii) A
(iv) A
(c) The largest binary number counted by a 4 cascaded flip-flop has a
decimal equivalent of 1

(i) t6
(ii) 15 .

(iii) 8
(iy) 7
I
v-871 1 [P.T.O.

(d) A 4-bit weighted resistor D/A converter uses 80O resistor for LSB.
The value of resistor used for MSB is 1

(i) 640 Ko
(ii) 10 KO
(iii) 40 Ko
(iv) 20 KO
(B) Attempt any two of the following :

(a) With suitable examples, explain decimal to hexadecimal conversion. 3

(b) Draw logic diagram of 4:l Multiplexer and explain its working with
truth table. 3

(c) Differentiate between Synchronous and Asynchronous Counters.
.
3

2 (A) Attempt any trvo of the follorving :

(a) Why NAND gate is called universal building block '? Construct
AND, OR gate using NAND gate. 3

(b) Draw basic circuit of TTL NAND gate and explain its working. ' 3

(c) What is mearit by modulus of a counter ? State 2r1' four applications
of a counter. 3

(B) Attempt any one of the following :

(a) What is a Decoder ? Explain BCD to decimal decoder using gates. 4

(b) Explain the rvorking of ccrunter type analog to digiial converter. State
its one drarvback. 4

J (A) Attempt any hvo of the follorving :

(a) Implement the expression using a multiplexer : 3
f(A, B, C, D) : Im (0, 1, 2,5, 7, 10, 14)
(b) Draw the circuit diagram of 4 bit binary ladder (R-2R.) DIA converter.
Obtain equation for output voltage. 3

(c) Solve the following binary subtraction using 1's complement rnethod :

(1001 - 1100)2 3

(B) Attempt any one of the follor.ving :
(a) State and prove DeMorgan's theorems. 4

(b) Draw logic diagram of a JK master-slave flip-flop and explain it
with truth table. 4

v-87I 1
a IContd.

4 (A) Attempt any two of the following :
(a) Prove the following identity using Boolean Laws 3

A + A. B _ A + B
(b) Explain in brief following characteristics of digital ICS : 3

(i) Power dissipation
(ii) Figure of merit
(iii) Fan-out
(c) Find the frequency of MSB output wavefonn in a 4-bit binary counter
if the square wave clock frequency is (i) 32 MHz (ii) 16 MHz
(iii) 8 MHz. 3

(B) Attcmpt any one of the following :
(a) Explain decimal to BCD encoder using OR gates. Write its truth table. 4
(b) Draw basic block diagram of computer and explain function of each
block. 1

5 (A) Attcmpt any two of the following :

(a) Solve the fbllowing : 3

(i) (6AD)r6 _ (?),0
(ii) (1001 10000011)2 : (?)'u
(iii) (BAD7)r6 _ Q),
(b) Design 8 : 1 Multiplexer using two 4 : I Multiplexer ICS 3

(c) Draw diagram of 4-bit strit left register using D flip-flop. Explain
its u,orking. Draw necessary wave form u,hen D : 1.I
3

(B) Attenrpt any one of the following :
(a) Explain full-adder with logic diagram, equations and tmth table. 4

(b) Write a short note on : 4

(i) Hard Disk
(ii) Printer (Any one type)
OR

v-871 3 IP.T.O.

s. (A) Attempt any two of the following :

(a) Explain l:4 demultiplexer with logic diagram and truth table. 3

(b) Write a note on T:flip-flop with logic circuit. 3

(c) What are the output voltages caused by MSB and LSB in a 4 bit
ladder if input levels are 0:0V and I - * 10V ? What if fuil scale
output voltage ? 3

(B) Attempt any one of the following :
(a) Write a note on BCD and ASCII Code. 4

(b) Draw basic circuits of CMOS Inverter and CMOS NAND gate. 4

Y-87t4

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