UGC NET 2015: December, Paper III, Electronic Science
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D8 8 1 5 PAPER - III
Time : 2½ hours] ELECTRONIC SCIENCE [Maximum Marks : 150
Number of Pages in this Booklet : 24 Number of Questions in this Booklet : 75
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D-8815 !D-8815-PAPER-III! 1 P.T.O.
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ELECTRONIC SCIENCE
PAPER - III
Note : This paper contains seventy five (75) objective type questions of two (2) marks each. All
questions are compulsory.
1. For the n-channel MOSFET shown in the figure given below, threshold voltage Vth52 V.
The drain current I D of the MOSFET is 4 mA when the drain resistance R D is 1 kV.
If the value of RD is increased to 4 kV, then the drain current ID will become :
(1) 2.8 mA (2) 2.0 mA (3) 1.4 mA (4) 1.0 mA
2. In an npn diffused junction transistor, the p-type base region is formed on the n-type
collector region through the process of :
(1) Alloying
(2) Epitaxial layer growth
(3) Diffusion of P-type of impurity
(4) Change of nature of doping during Crystal Growth
3. The average value of a periodic trapezoidal waveform is given by :
2 1
(1) Vav (t) 5 Vm (2) Vav (t) 5 Vm
3 3
(3) Vav (t) 5 Vm (4) Vav (t) 5 1.5 Vm
4. The circuit shown below, will act as an ideal current source with respect to terminals A and
B when frequency is :
(1) 1 rad/sec (2) 0 (3) 16 rad/sec (4) 4 rad/sec
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5. If a certain oscillator, Av550, the attenuation of the feedback circuit must be :
(1) 1 (2) 0.01 (3) 10 (4) 0.02
6. In circuit shown in the figure, if input voltage Vi is 0.2 V, then the output voltage Vo is :
(1) 6V (2) 26 V (3) 8V (4) 28 V
7. Which of the following A/D convertor is fastest ?
(1) Flash convertor (2) Successive approximation
(3) Counter ramp (4) Dual slope
8. For wired AND connection we should use :
(1) TTL gates with active pull up
(2) TTL gates with open collector
(3) TTL gates without active pull up and with open collector
(4) Any of the above
9. The 8085 assembly language instruction that stores the content of H and L register into the
memory locations 2051H and 2050H respectively is :
(1) SPHL 2050H (2) SPHL 2051H (3) SHLD 2050H (4) STAX 2050H
10. Consider the following instructions of 8085 microprocessor.
Which of these causes the change in status of flag (s) ?
(1) MOV M, A (2) CMP M
(3) MVI A, FF (4) None of the above
11. A member of a structure object can be accessed through a pointer to the structure object by
using :
(1) Dot operator (.) (2) Arrow operator (®)
(3) Dereference operator (&) (4) None of the above
D-8815 !D-8815-PAPER-III! 3 Paper-III
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12. The value returned by the strlen function when a string literal constant is given to it as an
argument is :
(1) One more than the number of characters in the string argument
(2) Same as the number of characters in the string argument
(3) One less than the number of characters in the string argument
(4) None of the above
13. For a quarter wave ideal transmission line of characteristic impedance of 50 V and load
impedance of 100 V, the input impedance of line will be :
(1) 50 V (2) 25 V (3) 100 V (4) 175 V
14. A TEM wave impinges obliquely on a dielectric - dielectric boundary with er152 of one
medium and er251 of another medium. The value of angle of incidence for total internal
reflection is :
(1) 458 (2) 308 (3) 608 (4) 758
n
15. A power signal f(t) has a power spectral density defined as Sf (v) 5 for ? v < B ?.
A2
d f (t )
The power spectral density of will be :
dt
p2 v2 A 2 4 p2 v2 A v2 n p2 v n
(1) (2) (3) (4)
4n n A2 A
16. The Rayleigh distribution of a random variable x is defined as :
x 2x 2
x 2x 2
e ; x /0 e ; x /0
(1) f x (x ) 5 s (2) f x (x ) 5 s 2 2s 2
2s 2 0
0 ; otherwise ; otherwise
x 2x 2 x2 2x 2
e ; x /0 e ; x /0
(3) f x (x ) 5 s 2 2s (4) f x (x ) 5 2 s 2 s2
0 0 ; otherwise
; otherwise
17. A fiber has a core radius of 6 mm, operating wavelength 5 1550 nm. The V-number of the
fiber is given by :
(1) 2.756 (2) 2.956 (3) 4.104 (4) 2.329
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18. The voltage safety factor (Vf ) of a thyristor is given by :
VPIV
(1) Vf 5
2 . R.M.S. value of the operating voltage
VPIV
(2) Vf 5
2 . R.M.S. value of the operating voltage
VPIV
(3) Vf 5
2 . Maximum value of the operating voltage
VPIV
(4) Vf 5
2 . Average of the operating voltage
19. Which of the following is used to estimate the probable error of any measurement ?
(1) Uniform distribution (2) Exponential distribution
(3) Parabolic distribution (4) Gaussian distribution
20. The circuit diagram of a capacitive transducer is shown in the following figure :
The frequency response of the transducer is :
(1) (2)
(3) (4)
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21. Which of the following statements are valid for JFET ?
V
(a) I DS 5 I DSS 12 GS
VP
V
(b) I DS 5 I DSS 1 1 GS
VP
gm
(c) m5
rd
(d) m5gm . rd
Options :
(1) (a) and (c) are true (2) (a) and (d) are true
(3) (b) and (c) are true (4) (b) and (d) are true
22. Which of the following statements are true for a zener diode ?
(a) The voltage across the zener resistance is zero.
(b) The diode is used as a constant voltage device.
(c) The diode is used as a varactor diode.
(d) The diode is formed of heavily doped p and p - type semiconductor.
Options :
(1) (a), (b) and (d) are correct (2) (b) and (d) are correct
(3) (b), (c) and (d) are correct (4) (c), (a) and (d) are correct
23. h parameters can be obtained in terms of Z and Y parameters. Following statements have
been given :
Where ∆ Z 5 Z11 Z 22 2 Z12 . Z 21
∆Y 5 Y11Y22 2 Y12 .Y21
∆Z Z12 1 2Y12
Z Z 22 Y Y11
(a) [ ] 22
h 5 (b) [ h ] 5 22
2Z 21 1 Y21 ∆Y
Z Z 22 Y Y21
22 11
∆Z Z 21 1 2Y12
Z Z 22 Y Y11
(c) [ h ] 5 11 (d) [ h ] 5 11
∆Y
2Z 21 1 Y21
Z Z 22 Y Y11
22 11
Out of the statements given above, which are correct ?
(1) (a) and (d) are correct (2) (b) and (c) are correct
(3) (c) and (d) are correct (4) (a) and (b) are correct
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24. For the following signal :
n n
1 1
x(n) 5 u ( n ) 1 u(n)
2 3
Z transforms and ROC has been given in below statements :
Z Z
(a) Z x ( n ) 5 1
1
Z2 2 Z 21 3
1 1
(b) ROC : ? Z ? > and ? Z ? >
2 3
Z Z
(c) Z x ( n ) 5 1
1
Z1 2 Z 11 3
1 1
(d) ROC : ? Z ? < and ? Z ? <
3 3
Out of the above given statements which are correct ?
(1) (b) and (c) are correct (2) (a) and (b) are correct
(3) (c) and (d) are correct (4) (a) and (d) are correct
25. Which of the following statements are valid for an oscillator ?
(a) It requires no dc supply.
(b) A phase shift around the feedback loop is zero.
(c) A gain of 1 around the feedback loop.
(d) A gain around the feedback loop of less than 1.
Options :
(1) (a) and (b) are correct (2) (b) and (d) are correct
(3) (b) and (c) are correct (4) (a), (b) and (c) are correct
26. For a full - wave rectifier, which of the following statements are correct ?
2 Vp
(a) Vdc 5
p
(b) fout52fin
2p
(c) Vdc 5
Vp
I
(d) Idc 5 m
p
Options :
(1) (a), (b) and (c) are correct (2) (a), (b) and (d) are correct
(3) (a) and (d) are correct (4) (b) and (d) are correct
D-8815 !D-8815-PAPER-III! 7 Paper-III
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27. Flip Flop can be used to make :
(a) Latches
(b) Bounce - elimination switches
(c) ADDER
(d) Encoder
Which of the statements given above are correct ?
(1) (a) and (b) only (2) (b) and (c) only
(3) (c) and (d) only (4) (a) and (d) only
28. Shift Register can be used as :
(a) Delay line (b) Ring counter (c) Multiplier (d) ADDER
Which of the statements given above are correct ?
(1) (a), (b) and (c) are correct (2) (a) and (b) are correct
(3) (b), (c) and (d) are correct (4) (c) and (d) are correct
29. The instructions that clear the accumulator in 8085 :
(a) MVI A, 00H (b) ANI 00H (c) RLC (d) XRA A
Options :
(1) (a) and (c) (2) (a), (b) and (d) (3) (b) and (c) (4) (b), (c) and (d)
30. Which of the following are 16 bit components ?
(a) Program Counter in 8085 (b) Number of Pins in 8251 USART
(c) Data Pins in 8088 (d) Data Pins in 8086
Options :
(1) (a) and (d) (2) (b) and (c) (3) (a) and (c) (4) (a) and (b)
31. Consider the declaration.
static char hello [ ]5hello;
The output of printf (%s\n, hello); will be same as that of :
(a) puts(hello); (b) puts(hello);
(c) printf(%s\n, hello); (d) puts(hello\n);
Options :
(1) (a), (b) and (c) (2) (a), (b) and (d)
(3) (b), (c) and (d) (4) (a), (c) and (d)
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32. Let X be an array. Which of the following operations are illegal ?
(a) 11X (b) X11 (c) X11 (d) X*2
Options :
(1) (a), (b) and (c) (2) (b), (c) and (d)
(3) (a), (c) and (d) (4) (a), (b) and (d)
33. For obtaining the VSWR, following statements have been given :
(a) If VSWR5:, there is perfect mismatch.
(b) If reflection coefficient50, there is perfect mismatch.
(c) The distance between successive maxima and minima5 l 4 .
(d) The distance between successive maxima and minima5 l 2 .
Out of the above statements which are correct ?
(1) (a), (b) and (d) (2) (a) and (c)
(3) (b) and (d) (4) (a), (b) and (c)
34. In dominant mode in a rectangular wave guide, following statements are given :
(a) There is no attenuation.
(b) There is no TEM mode propagation.
(c) There is no magnetic field component.
(d) The dominant modes shows the highest cut - off wavelength.
Out of the above statements which are correct ?
(1) (a) and (b) (2) (b) and (d)
(3) (b) and (c) (4) (a) and (d)
35. Read the following statements.
(a) Industrial noise is usually of impulse type.
(b) HF mixers are generally noisier than HF amplifiers.
(c) Thermal noise is independent of frequency at which it is measured.
(d) Impulse noise voltage is independent of the bandwidth.
Which of the above statements are correct ?
(1) (a) and (b) only (2) (a), (b) and (c) only
(3) (b), (c) and (d) only (4) (b) and (d) only
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36. Read the following statements regarding the advantages of SSB over DSB and full carrier
AM :
(a) In SSB more channel space is available.
(b) The transmitting circuit of SSB is more stable.
(c) The SSB signal is more noise - resistant.
(d) SSB needs less power for the same signal strength.
Which of the above statements are correct ?
(1) (a) and (b) only (2) (b) and (c) only
(3) (a), (b) and (c) only (4) (a), (c) and (d) only
37. In SCR, the following statements are given :
(a) It acts as a short circuit device.
(b) It acts as a open circuit device.
(c) ON state voltage is approximately 2 - 5 Volts.
(d) ON state voltage is approximately 50 - 100 Volts.
Which of the above statements are correct ?
(1) (a) and (d) (2) (a) and (c) (3) (b) and (d) (4) (b) and (c)
38. Photodiode can be used as :
(a) as a detector in forward biased (b) as a detector in reverse biased
(c) as an LDR (d) it generates solar energy
Which of the above statements are correct ?
(1) (a) and (b) (2) (b) and (c) (3) (c) and (d) (4) (a), (b) and (c)
39. Read the following statements :
(a) Stability is a performance measure of a system.
(b) A system is stable if all the poles of the transfer function have positive real part.
(c) A system is stable if all the zeros of the transfer function have negative real parts.
(d) A system is stable if all the poles of the transfer function have negative real parts.
Which of the above statement/s is/are correct ?
(1) Only (a) (2) Only (a) and (c)
(3) Only (a) and (b) (4) Only (a) and (d)
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40. Read the following statements about the transfer function of a system :
(a) The transfer function provides complete insight into the structure of the system.
(b) It offers a symbolic picture about the dynamic characteristics of the system.
(c) It does not give any insight into the structure of the system.
(d) If the transfer functions of individual components of the system are known, the overall
characteristics of the system can be determined just by taking their product.
Which of the above statements are correct ?
(1) Only (a) and (b) (2) Only (b) and (c)
(3) Only (b) and (d) (4) Only (b), (c) and (d)
41. Match the following :
List - I List - II
(a) Lift - off (i) Ficlis Equation
(b) Dry Etching (ii) PMMA (Poly Methyl Methacrylate)
(c) Lithography (iii) Bombardment of Plasma
(d) Diffusion (iv) Structures of Target Material on the Surface of Substrate
Codes :
(a) (b) (c) (d)
(1) (iv) (iii) (ii) (i)
(2) (iv) (ii) (iii) (i)
(3) (iii) (i) (ii) (iv)
(4) (i) (iii) (ii) (iv)
42. Match the following in the context of RLC series circuit :
List - I List - II
(a) Under damped (i) j51
(b) Critically damped (ii) j>1
1
(c) Quality factor (iii) 2j
(d) Over damped (iv) j<1
Codes :
(a) (b) (c) (d)
(1) (i) (ii) (iv) (iii)
(2) (iii) (i) (ii) (iv)
(3) (iv) (i) (iii) (ii)
(4) (ii) (iii) (i) (iv)
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43. Match the following :
List - I List - II
(a) (i)
(b) (ii)
(c) (iii)
(d) (iv)
Codes :
(a) (b) (c) (d)
(1) (iv) (iii) (ii) (i)
(2) (i) (iv) (iii) (ii)
(3) (i) (ii) (iii) (iv)
(4) (iv) (i) (iii) (ii)
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44. Match the following :
List - I List - II
(a) Minimization (i) Multiplexer
(b) Successive Approximation (ii) Shift Register
(c) Data Selector (iii) A/D Convertor
(d) Sequence Generator (iv) QM Method
Codes :
(a) (b) (c) (d)
(1) (iii) (i) (ii) (iv)
(2) (iv) (iii) (i) (ii)
(3) (i) (ii) (iii) (iv)
(4) (ii) (i) (iv) (iii)
45. Match the following in the context of 8085 mP :
List - I List - II
(a) GND (i) Pin 26
(b) RESET (ii) Pin 5
(c) RD (iii) Pin 35
(d) VCC (iv) Pin 7
Codes :
(a) (b) (c) (d)
(1) (i) (iii) (ii) (iv)
(2) (iv) (i) (iii) (ii)
(3) (iv) (ii) (i) (iii)
(4) (iv) (iii) (ii) (i)
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46. Match the following :
List - I List - II
(a) Ternary operator (i) Subscript
(b) Array (ii) Heterogeneous
(c) Continue (iii) Three arguments
(d) Structure (iv) Unconditional branch
Codes :
(a) (b) (c) (d)
(1) (iv) (iii) (i) (ii)
(2) (iii) (i) (ii) (iv)
(3) (i) (iii) (iv) (ii)
(4) (iii) (i) (iv) (ii)
47. Match the following :
List - I List - II
Pi
(a) Return Loss (i) 10 log
Pi 2 Pr
Pi 2Pr
(b) Insertion Loss (ii) 10 log P
o
Pi
(c) Transmission Loss (iii) 10 log P
r
Pi
(d) Reflection Loss (iv) 10 log10 P
o
where Pi → input power at port - 1
Pr → reflected power at port - 1
Po → output power at port - 2
Codes :
(a) (b) (c) (d)
(1) (i) (ii) (iv) (iii)
(2) (iv) (iii) (ii) (i)
(3) (ii) (i) (iv) (iii)
(4) (iii) (iv) (i) (ii)
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48. Match the following :
List - I List - II
1 E
(a) Coherent PSK (i) exp 2 b
2 2N o
1 E
(b) Coherent FSK (ii) exp 2 b
2 No
(c) Non - coherent DPSK (iii)
1
2
erfc ( Eb
No )
(d) Non - coherent FSK (iv)
1
2
erfc ( Eb
2 No )
Codes :
(a) (b) (c) (d)
(1) (ii) (iv) (i) (iii)
(2) (i) (ii) (iii) (iv)
(3) (iii) (iv) (i) (ii)
(4) (iii) (iv) (ii) (i)
49. Match the following :
List - I List - II
(a) UJT (i) Latching current
(b) SCR (ii) Bi-directional
(c) DIAC (iii) Inverter
(d) Mc-Murray (iv) intrinsic stand off ratio
Codes :
(a) (b) (c) (d)
(1) (ii) (i) (iv) (iii)
(2) (iii) (i) (ii) (iv)
(3) (iv) (i) (ii) (iii)
(4) (i) (ii) (iv) (iii)
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50. Match the following :
List - I List - II
1
(a) (i)
s2 a
1
(b) (ii)
s1 a
1
(c) (iii)
( s 2a )21vo2
1
(d) (iv)
( s 1 a )21vo2
Codes :
(a) (b) (c) (d)
(1) (iii) (iv) (i) (ii)
(2) (iii) (ii) (iv) (i)
(3) (iv) (i) (iii) (ii)
(4) (iv) (i) (ii) (iii)
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51. Arrange the below mentioned diodes in order of the increasing doping concentration level :
(a) Avalanche Diode (b) Normal Diode
(c) Tunnel Diode (d) Zener Diode
Options :
(1) (b), (a), (d), (c) (2) (b), (d), (c), (a)
(3) (b), (d), (a), (c) (4) (a), (b), (d), (c)
52. A 20 V resistor is connected in series with an inductor, a capacitor and an ammeter across a
25 Volts variable frequency supply. When the frequency is 400 Hz, the current attains its
maximum value of 0.5A, and the potential difference across the capacitor is 150 V.
The values are given :
(a) Capacitance 5 1.325 mF (b) Inductance 5 0.119 H
(c) Capacitance 5 0.325 mF (d) Inductance 52 H
Which of the above values are correct ?
(1) (a) and (b) (2) (b) and (c)
(3) (c) and (d) (4) (a) and (d)
53. Arrange the below referred amplifiers in the decreasing order of the input impedance :
(a) Common Base Transistor Amplifier
(b) Common Emitter Transistor Amplifier
(c) Common Collector Transistor Amplifier
(d) Operation Amplifiers
Options :
(1) (a), (b), (c), (d) (2) (c), (a), (b), (d)
(3) (d), (c), (b), (a) (4) (d), (b), (c), (a)
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54. For a logic family, if :
VOH is minimum output high level voltage.
VOL is maximum output low level voltage.
VIH is minimum acceptable input high level voltage.
VIL is maximum acceptable input low level voltage.
The correct relationship among these is :
(1) VIH>VOH>VIL>VOL (2) VOH>VIH>VIL>VOL
(3) VIH>VOH>VOL>VIL (4) VOH>VIH>VOL>VIL
55. In the 8257 DMA controller, the content of bits A15 (RD)50 and A14 (WR)51 of the terminal
count register indicate :
(a) Write cycle in memory mapped. (b) Read cycle in memory mapped.
(c) Write cycle in I/O mapped. (d) Read cycle in I/O mapped.
Which of the above are correct ?
(1) (a) and (d) (2) (a) and (b)
(3) (b) and (c) (4) (c) and (d)
56. Following are the arithmetic operators in C :
(a) % (Modulus) (b) 2 (Unary minus)
(c) 11 (Increment) (d) 1 (Binary plus)
Which one of the following sequence is correct in the order of decreasing priority of
the above given operators ?
(1) (a), (c), (d), (b) (2) (d), (b), (c), (a)
(3) (b), (c), (a), (d) (4) (c), (b), (d), (a)
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57. Following are the microwave bands given :
(a) C band (b) L band
(c) Ku band (d) Sub millimeter band
Arrange the above in the ascending order of frequencies. The correct sequence is :
(1) (b), (a), (d), (c) (2) (d), (c), (a), (b)
(3) (d), (a), (c), (b) (4) (b), (a), (c), (d)
58. Consider the following probability density function for a random variable x.
(a) f1(x)51 ; 21[x[ 1
(b) f2(x)5x ; 0[x[ 1
(c) f3(x)5(12x) ;21 [x[ 1
Arrange the above functions in terms of the increasing value of mean of random variable x.
(1) (a), (b), (c) (2) (b), (a), (c)
(3) (c), (b), (a) (4) (b), (c), (a)
59. Following semiconductor materials are given :
(a) Si (b) Ge (c) Ga P (d) Ga As
Arrange them in ascending order of their band gap. The correct option is :
(1) (b), (a), (d), (c) (2) (b), (a), (c), (d)
(3) (a), (b), (c), (d) (4) (d), (a), (b), (c)
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60. Consider the following circuit :
(a)
(b)
(c)
Arrange the above circuits in terms of decreasing number of total number of poles and zeros.
(1) (a), (b), (c) (2) (a), (c), (b) (3) (b), (a), (c) (4) (c), (b), (a)
Directions for questions 61 to 70 : The following items consist of two statements, one labelled
the Assertion (A) and the other labelled Reason (R). You are to examine the two
statements carefully and decide if the Assertion (A) and Reason (R) are individually true and
if so, whether the reason is a correct explanation of the Assertion. Select your answer to
these items using the codes given below and mark your answer accordingly.
Codes :
(1) Both (A) and (R) are true and (R) is the correct explanation of (A).
(2) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(3) (A) is true, but (R) is false.
(4) (A) is false, but (R) is true.
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61. Assertion (A) : When a Varactor Diode is connected to an inductor L in a resonant circuit,
the resonant frequency varies linearly with voltage applied to the varactor.
Reason (R) : Because the PN junction used is an hyperabrupt PN junction.
62. Assertion (A) : Laplace and Z transforms can be applied to the analysis of many unstable
systems and consequently play an important role in the investigation of the
stability or instability of the systems.
Reason (R) : The region of convergence of the Laplace transform of x(t) is given by the
:
2s t
expression : ∫ x(t)e dt /:
2:
63. Assertion (A) : A small signal amplifier is one where the input voltage is sufficiently small
and change in output current is only small fraction of the mean output
current.
Reason (R) : Several stages of small signal amplifiers are therefore coupled together in
cascade.
64.
Assertion (A) : In the Fig. above, output in HIGH state, Q3 acts as an emitter follower with
its associated low output impedance. This low output impedance provides
a small time constant for charging up any capacitive load as the output.
This action is called active pull-up and it provides very fast rise time wave
forms at TTL Totem - pole output.
Reason (R) : Totem - pole outputs cannot be wire ANDed i.e. outputs of a number of
gates cannot be tied together to obtain AND operation of those outputs.
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65. Assertion (A) : The data bus of a microprocessor is used to transfer information between
the mp and memory, between the mp and I/O device.
Reason (R) : The data bus of a microprocessor is unidirectional.
66. Assertion (A) : Unless we call initgraph( ), we cannot draw anything on the screen.
Reason (R) : Any shape drawn on the screen can be animated using the getimage( ) and
putimage( ) functions.
67. Assertion (A) : Circular polarisation is a special case of elliptical polarisation.
Reason (R) : In elliptical polarisation, the wave has two components, one is traversing in
x direction and other traverses in y direction. Which causes the Electric
Vector to rotate as a function of time.
68. Assertion (A) : As compared to PWM, PAM and PPM, PCM is much better for noise
immunity.
Reason (R) : PCM depends only on the presence or absence of pulses at any given time,
not on any characteristics of the pulses which could be distorted.
69. Assertion (A) : Light is electromagnetic wave in nature, these may be x - rays, radio waves,
microwaves etc.
Reason (R) : The amount of energy depends on the intensity of the light rays. The energy
associated with each photon is proportional to the frequency.
70. Assertion (A) : The dynamics of a system can be represented by a series of first order
differential equations.
Reason (R) : The state variables describe the future response of a system, given the present
state, the excitation inputs, and the equations describing the dynamics.
Directions for question numbers 71 to 75 : Read the passage and answer the questions
from 71 to 75 that follow based on your understanding of passage :
A microprocessor is a semiconductor chip fabricated with entire central processing
unit (CPU) on it. It is a programmable device that accepts binary data from an input device,
processes the data according to the instructions stored in the memory and provides results as
output. Basically microprocessor performs two functions - (a) Fetches an instruction from
the memory and (b) Performs the operation specified by the instruction. There are special
inputs to the microprocessor called interrupts. External devices use these interrupts to get
the microprocessor attention. A micro computer can be built by using 8085 microprocessor
along with many other chips such as 8155, 8255, 8279, 8253, 8257, 8259, 8251 etc. 8085
microprocessor is 8 - bit microprocessor which has 8 - bit data registers where as 8086 is a
16 - bit microprocessor.
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71. In 8085, if the clock frequency is 5 MHz, the time required to execute an instruction of
18 T - states is :
(1) 1.6 m sec (2) 3.6 m sec (3) 2.6 m sec (4) 4.6 m sec
72. In 8085 microprocessor, the value of the most significant bit of the result following the
execution of any Arithmetic or Boolean instruction is stored in :
(1) The sign status flag
(2) The auxiliary carry status flag
(3) The carry status flag
(4) The zero status flag
73. PUSH B instruction in 8085 mp causes :
(1) The contents of register B only to be copied in the stack.
(2) The contents of registers B and C to be transferred in the stack and the registers get
cleared.
(3) The contents of registers B and C to be copied in the stack.
(4) Registers B and C to be cleared.
74. The technique of assigning a memory address to each I/O device in the computer system is
called :
(1) Isolated I/O (2) Ported I/O
(3) Dedicated I/O (4) Memory - Mapped I/O
75. Which instruction cannot force the 8086 processor to come out of HALT state ?
(1) Interrupt request
(2) RESET
(3) Both interrupt request and RESET
(4) HOLD
-o0o-
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Space For Rough Work D-8815 !D-8815-PAPER-III! 24 Paper-III
Official key not published for this paper.
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Source: University Grants Commission. Question paper published by University Grants Commission.