MH SET 2011: 27 November, Paper II, Electronic Science
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ELECTRONIC SCIENCE
Paper II
Time Allowed : 75 Minutes] [Maximum Marks : 100
Note : This Paper contains Fifty (50) multiple choice questions, each question
carrying Two (2) marks. Attempt All questions.
1. For a certain 12 V zener diode, a 3. The process of growth, by which an
10 mA change in zener current
amount of material is set down upon
produces a 0.1 V change in zener
voltage. The zener impedance for a crystalline substrate while the
this current, change is : overall single-crystal structure is
(A) 0.1 ohm
still preserved, is known as............ .
(B) 1 ohm
(C) 10 ohm (A) Impurity diffusion
(D) 100 ohm
2. Which of the following statements (B) Doping
is correct :
(C) Epitaxy
(A) more number of electron-hole
pairs will be generated in silicon (D) Ion implantation
than in germanium at room
temperature 4. A major factor that limits the high
(B) less number of electron-hole
frequency gain of MOS transistors
pairs will be generated in silicon
than germanium at room is...................caused by overlapping of
temperature the gate electrode and the drain.
(C) number of electron-hole pairs
generated are equal both in (A) Overall impedance
silicon and germanium at room
temperature (B) Parasitic capacitance
(D) Conductivity of silicon is more
(C) Parasitic conductance
than that of germanium at
room temperature (D) Overall conductance
1 [P.T.O.
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5. Metallization in IC fabrication is
7. Laplace transform of first derivative
carried by :
of a function f(t) is :
(A) CVD technique
F(S)
(B) EB evaporation technique (A)
S
(C) ALD technique
(B) S F (S) f (0)
(D) Oxidation technique
(C) F (S) f (0)
6. A circuit consists of two resistances
R1 and R2 in parallel. The total (D) S F (S) S f (0)
current passing through the circuit
8. Z-transform of x(n) = G (n – k) for
is I T , then the current passing
through R1 is : k > 0 is :
R1
(A) R + R I T (A) Z K
1 2
R1 + R 2
(B) IT
R1 (B) 1
R2
(C) R + R I T
1 2 (C) Z–K
IT
(D) R [R + R ]
1 1 2 (D) K
2
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10. What is the driving-point impedance
9. One of the following properties of
of the following circuit (consider
transfer function is correct :
1-1 port as input) ?
(A) The transfer function is not a 1 2
1 2:
ratio of polynomials in S 3:
1 2
(B) All complex poles and zeros
(A) 3 :
must not occur in conjugate
(B) 5 :
pairs (C) 4 :
(D) 2.2 :
(C) The real parts of all poles must
11. The average value of a half wave
be positive
rectifier voltage with a peak value
(D) The coefficients of numerator of 200 V is :
(A) 63.7 V
polynomial P(S) and
(B) 127.3 V
denominator polynomial Q(S)
(C) 141 V
must be real
(D) 0 V
3 [P.T.O.
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12. A DC voltage regulated power 14. For an inverting amplifier, the input
is fed through a resistance R1 and
supply normally uses :
let R2 be the feedback resistance.
(A) only amplifier circuit
Then the input resistance is
(B) only negative feedback approximately :
(C) amplifier and error feed- (A) R12 / R 2
back (B) R 22 / R1
(C) R1R 2
(D) only filter circuit
(D) R 1
13. Two inputs sin Zt and cos Zt are fed
15. If A is the amplifier gain and B is
to two terminals of a differential
the feedback factor, then condition
amplifier. The output will be :
for generating oscillations is :
(A) sin Zt + cos Zt
(A) AB = –1
(B) sin Zt – cos Zt (B) AB = +1
(C) 0 (C) AB = 0
(D) sin Zt . cos Zt (D) AB = f
4
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19. A modulus 5 ring counter requires
16. The most suitable gate for
a minimum of :
comparing two bits is :
(A) ten flip-flops
(A) AND
(B) five flip-flops
(B) OR
(C) four flip-flops
(C) NAND
(D) twleve flip-flops
(D) XOR 20. A memory with 256 addresses
17. On a Karnaugh map, grouping the has :
0’s produces : (A) 256 address lines
(A) a product of sums expression (B) 6 address lines
(B) a sum of products expression (C) 1 address line
(D) 8 address lines
(C) a “don’t care” condition
21. Which of the following is an example
(D) AND-OR logic
of embedded system for data
18. A 4-bit parallel adder can add : communication ?
(A) two 4-bit binary numbers (A) USB for mass storage
(B) two 2-bit binary numbers (B) Digital camera
(C) four bits at a time (C) Network router
(D) four bits in a sequence (D) Music player
5 [P.T.O.
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22. What is the minimum number of 24. The serial port of the standard 8051
I/O lines required to interface a architecture is :
16 key matrix keyboard ?
(A) Simplex
(A) 16
(B) Half duplex
(B) 8
(C) ‘Receive’ buffered
(C) 32
(D) ‘Transmit’ buffered
(D) 4
25. Which is the addressing mode for
23. What is the minimum number of
the instruction MOVC A,
interface lines required for
@ A + DPTR ?
implementing I2C interface ?
(A) Direct
(A) 2
(B) Indexed
(B) 1
(C) Immediate
(C) 3
(D) Register
(D) 4
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26. What will be the output of the
27. The resolution of a SVGA monitor
following C program module ?
is :
main( )
(A) 320 × 200
{ int i, j;
(B) 320 × 400
i = 0;
(C) 640 × 640
do
(D) 640 × 480
{ j = i * i;
28. The data structure which allows
i++;
storage of multiple values in the
} while (j < = 6);
same variable name with a subscript
print (“%d %d”, i, j);
is called as :
}
(A) Array
(A) 2 4
(B) 3 4 (B) Tree
(C) 4 9 (C) List
(D) 4 4 (D) Que
7 [P.T.O.
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29. Which of the following is not a serial 31. A transmission line has a VSWR of
2, The reflection coefficient is :
port ?
1
(A)
(A) USB 3
(B) 0
(B) Centronix port
1
(C)
(C) RS232 C 4
1
(D) 9 pin D connector on a PC (D)
2
motherboard 32. A strip transmission line is formed
over a dielectric medium with
30. The correct sequence for file
r 4 . The width of the strip is
handling in C is :
6 mm and the thickness of dielectric
(A) Define file pointer, use fopen, is 2 mm. The characteristic
impedance of this line is :
read/write data, close
1 P0
(B) Use fopen, define file pointer, (A) 20
0
read/write data, close
P0
(B)
0
(C) Use fopen, close, define file
P0
pointer, read/write data (C) 2
0
(D) Define file pointer, read/write
1 P0
(D)
data use fopen, close 10 0
8Official key not published for this paper.
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Source: Savitribai Phule Pune University. Question paper published by Savitribai Phule Pune University.