BARC Previous question papers

Will you please give me question paper for placement in Bhabha Atomic Research Centre (BARC) soon ?

[Arun Vats]

Here I am giving you question paper for placement in Bhabha Atomic Research Centre (BARC).............

BARC Electronics and electrical Question papers

1 Differential amplifiers are used in
a. instrumentation amplifiers
b. voltage followers
c. voltage regulators
d. buffers

2 The output voltage Vo of the above circuit is
a.-6V
b.-5V
c.-1.2V
d.-0.2V

3 The ideal OP-AMP has the following characteristics.
a) Ri=∞ ,A=∞ ,R0=0
b) Ri=0 ,A=∞ ,R0=0
c) Ri=∞ ,A=∞ ,R0=∞
d) Ri=0 ,A=∞ ,R0=∞

4 How many op-amps are required to implement this equation
A. 2
B. 3
C. 4
D. 1


5 A very brief, high voltage spike on an ac power line is called as
A. A bleeder
B. An arc
C. A transient
D. An avalanche
E. A clipped peak

6 You can find the zener diode in
A. The mixer in a superheterodyne receiver
B. The PLL in a circuit for detecting FM
C. The product detector in a receiver for SSB
D. The voltage regulator in a power supply
E. The AF oscillator in an AFSK transmitter

7 A network function can be completely specified by:
(A) Real parts of zeros
(B)Poles and zeros
(C)Real parts of poles
(D)Poles, zeros and a scale factor

8 A unit impulse voltage is applied to one port network having two linear components. If the current through the network is 0 for t<0 and decaysexponentially for t>0then the network consists of
(A) R and L in series
(B)R and L in parallel
(C)R and C in parallel
(D)R and C in series

9 The Q-factor of a parallel resonance circuit consisting of an inductance of value 1mH, capacitance of value 10-5 F and a resistance of 100 ohms is
(A) 1
(B)10
(C) π 20
(D) 100

10 In a travelling electromagnetic wave, E and H vector fields are
(A) perpendicular in space .
(B) parallel in space.
(C) E is in the direction of wave travel.
(D) H is in the direction of wave travel.

1. A certain type of mixture is prepared by mixing brand A at Rs.9 a kg.
with brand B at Rs.4 a kg. If the mixture is worth Rs.7 a kg., how many
kgs. of brand A are needed to make 40kgs. of the mixture?
Ans. Brand A needed is 24kgs.
2. A wizard named Nepo says “I am only three times my son’s age. My
father is 40 years more than twice my age. Together the three of us are
a mere 1240 years old.” How old is Nepo?
Ans. 360 years old.
3. One dog tells the other that there are two dogs in front of me. The
other one also shouts that he too had two behind him. How many are they?
Ans. Three.
4. A man ate 100 bananas in five days, each day eating 6 more than the
previous day. How many bananas did he eat on the first day?
Ans. Eight.
5. If it takes five minutes to boil one egg, how long will it take to
boil four eggs?
Ans. Five minutes.
6. Three containers A, B and C have volumes a, b, and c respectively; and
container A is full of water while the other two are empty. If from
container A water is poured into container B which becomes 1/3 full, and
into container C which becomes 1/2 full, how much water is left in
container A?
7. ABCE is an isosceles trapezoid and ACDE is a rectangle. AB = 10 and EC
= 20. What is the length of AE?
Ans. AE = 10.
8. In the given figure, PA and PB are tangents to the circle at A and B
respectively and the chord BC is parallel to tangent PA. If AC = 6 cm,
and length of the tangent AP is 9 cm, then what is the length of the
chord BC?
Ans. BC = 4 cm.
9 Three cards are drawn at random from an ordinary pack of cards. Find
the probability that they will consist of a king, a queen and an ace.
Ans. 64/2210.
10. A number of cats got together and decided to kill between them 999919
mice. Every cat killed an equal number of mice. Each cat killed more mice
than there were cats. How many cats do you think there were ?
Ans. 991.
11. If Log2 x – 5 Log x + 6 = 0, then what would the value / values of x
be?
Ans. x = e2 or e3.
12. The square of a two digit number is divided by half the number. After
36 is added to the quotient, this sum is then divided by 2. The digits of
the resulting number are the same as those in the original number, but

they are in reverse order. The ten’s place of the original number is
equal to twice the difference between its digits. What is the number?
Ans. 46
13.Can you tender a one rupee note in such a manner that there shall be
total 50 coins but none of them would be 2 paise coins.?
Ans. 45 one paisa coins, 2 five paise coins, 2 ten paise coins, and 1
twenty-five paise coins.
14.A monkey starts climbing up a tree 20ft. tall. Each hour, it hops 3ft.
and slips back 2ft. How much time would it take the monkey to reach the
top?
Ans.18 hours.
15. What is the missing number in this series? 8 2 14 6 11 ? 14 6 18 12
Ans. 9
16. The minute hand of a clock overtakes the hour hand at intervals of 64
minutes of correct time. How much a day does the clock gain or lose?
Ans. 32 8/11 minutes.
17. Solve for x and y: 1/x – 1/y = 1/3, 1/x2 + 1/y2 = 5/9.
Ans. x = 3/2 or -3 and y = 3 or -3/2.
18. Daal is now being sold at Rs. 20 a kg. During last month its rate was
Rs. 16 per kg. By how much percent should a family reduce its consumption
so as to keep the expenditure fixed?
Ans. 20 %.
19. Find the least value of 3x + 4y if x2y3 = 6.
Ans. 10.
20. Can you find out what day of the week was January 12, 1979?
Ans. Friday.
21. A garrison of 3300 men has provisions for 32 days, when given at a
rate of 850 grams per head. At the end of 7 days a reinforcement arrives
and it was found that now the provisions will last 8 days less, when
given at the rate of 825 grams per head. How, many more men can it feed?
Ans. 1700 men.
22. From 5 different green balls, four different blue balls and three
different red balls, how many combinations of balls can be chosen taking
at least one green and one blue ball?
Ans. 3720.
23. Three pipes, A, B, & C are attached to a tank. A & B can fill it in
20 & 30 minutes respectively while C can empty it in 15 minutes. If A,
B & C are kept open successively for 1 minute each, how soon will the
tank be filled?
Ans. 167 minutes.
24. A person walking 5/6 of his usual rate is 40 minutes late. What is
his usual time?

Ans. 3 hours 20 minutes.
25. Mr. Shah decided to walk down the escalator of a tube station. He
found that if he walks down 26 steps, he requires 30 seconds to reach
the bottom. However, if he steps down 34 stairs he would only require 18
seconds to get to the bottom. If the time is measured from the moment the
top step begins to descend to the time he steps off the last step at
the bottom, find out the height of the stair way in steps?
Ans.46 steps.

BARC Electronics and electrical Question papers

1 Differential amplifiers are used in
a. instrumentation amplifiers
b. voltage followers
c. voltage regulators
d. buffers

2 The output voltage Vo of the above circuit is




a.-6V
b.-5V
c.-1.2V
d.-0.2V

3 The ideal OP-AMP has the following characteristics.
a) Ri=∞ ,A=∞ ,R0=0
b) Ri=0 ,A=∞ ,R0=0
c) Ri=∞ ,A=∞ ,R0=∞
d) Ri=0 ,A=∞ ,R0=∞

4 How many op-amps are required to implement this equation


A. 2
B. 3
C. 4
D. 1


5 A very brief, high voltage spike on an ac power line is called as
A. A bleeder
B. An arc
C. A transient
D. An avalanche
E. A clipped peak

6 You can find the zener diode in
A. The mixer in a superheterodyne receiver
B. The PLL in a circuit for detecting FM
C. The product detector in a receiver for SSB
D. The voltage regulator in a power supply
E. The AF oscillator in an AFSK transmitter

7 A network function can be completely specified by:
(A) Real parts of zeros
(B)Poles and zeros
(C)Real parts of poles
(D)Poles, zeros and a scale factor

8 A unit impulse voltage is applied to one port network having two linear components. If the current through the network is 0 for t<0 and decaysexponentially for t>0then the network consists of
(A) R and L in series
(B)R and L in parallel
(C)R and C in parallel
(D)R and C in series

9 The Q-factor of a parallel resonance circuit consisting of an inductance of value 1mH, capacitance of value 10-5 F and a resistance of 100 ohms is
(A) 1
(B)10
(C) π 20
(D) 100

10 In a travelling electromagnetic wave, E and H vector fields are
(A) perpendicular in space .
(B) parallel in space.
(C) E is in the direction of wave travel.
(D) H is in the direction of wave travel.

11 The lower cut -off frequency of a rectangular wave guide with inside dimensions (3 × 4.5 cm) operating at 10 GHz is
(A) 10 GHz.
(B)9 GHz.
(C) 10/9GHz.
(D) 10/3GHz

12 The intrinsic impedance of free space is
(A) 75 ohm.
(B)73 ohm.
(C)120 π ohm.
(D)377ohm

13 Which one of the following conditions will not guarantee a distortion less transmission line
(A)R = 0 = G
(B)RC = LG
(C) very low frequency range (R>> ω L, G >> ω C)
(D) very high frequency range (R<< ω L, G << ω C)

14 MOSFET can be used as a
(a) current controlled capacitor
(b) voltage controlled capacitor
(c) current controlled inductor
(d) voltage controlled inductors

15 In a common emitter, unbypassed resister provides
(a)voltage shunt feedback
(b)current series feedback
(c)negative voltage feedback
(d)positive current feedback

16 Introducing a resistor in the emitter of a common amplifier stabilizes the dc operating point against variations in
a) Only the temperature
b) only the β of the transistor
c) Both Temperature & β
d) None of the above

17 For the circuit shown in Fig.4, the voltage across the last resistor is V.All resistors are of Ω 1 .The Vs is given by




(A) 13V.
(B) 8V.
(C) 4V.
(D)1V

18 The network has a network function Z(s)=s(s+2)/(s+3)(s+4)
(A)not a positive real function.
(B)RL network.
(C) RC network.
(D)LC network

19 For a series R-C circuit excited by a d-c voltageof 10V, and with time-constant s, , τ the voltage across C at time τ = t is given by
A.10(1-e-1) v
B.10(2-e-2) v
C.10-e-1volts
D.1-e-1

20 A 2 port network using Z parameter representation is said to bereciprocal if
A.Z11=Z22
B.Z12=Z21
C.Z12=-Z21
D.Z11–2Z22=0

please send me a previous papers with answers of online exam of BARC for m.tech in stream of eee my email.id- venkatasahithyak@gmail.com

hey hi, myself Pradeep. I am preparing for BARC this year. Can you mail the previous year question papers of BARC to renga.pradeep01@gmail.com
thanks,
regards,
Pradeep R

please send me barc previous papers for eee .
my mail id is sivakrishnaarusuru@gmail.com

please send me the previous question papers for biosciences