WIPRO JADAVPUR 2000

WIPRO TECHNOLOGIES 2000

JADAVPUR UNIVERSITY
Time - 1 hr (no -ve marking )
PART - 1 ( same for all departments )
Total 55 questions
Q1 - 30 +2 level PCM
Q31-50 aptitude
Q51-55 algorithm

Q.1) An electron can move freely in the field of an em wave.In which direction does it move?
a)in the direction of elec. field
b)in the direction of magnetic field
c)in the direction of propagation of em wave
d)in a plane containing magnetic field & direction of propagation of wave

Q.2) A man measures the length of a rod . In the first case the man is moving & in the second case the rod is moving. Will there be any change in the measurement of length ?

Q.3) The wavelength of X-rays lies
a) above a certain minimum value
b) below a certain maximum value
c) above a certain minimum and below a certain maximum value
d) above a certain maximum and below a certain minimum value
Correct answer (c)

Q.4) Toluene + chlorine in presence of ferric chloride gives
a) metachlorotoluene
b) ortho & para chlorotoluene
c) benzoyl chloride
d) ….. correct answer (b)

Q.5) Mechanism by which a proton ……..
a) metamerism
b) tautomerism
c) structural isomerism
d) ……

Q.6) Acidic effect is shown by
a) CO3- - b) NO3- c) I- d) OH-

Q.7) Which is correct ?
a) 40 ml of hydrogen sulphide & 40 ml of chlorine gives 120 ml of gas
under stp
b) …gram equivalent weight…
c) …normality….
d) …..
Q.8) In how many ways can 7 distinct toys be distributed among 3 children ?
a) 3^7 b) .. c) 7p3 d)7c3

Q.9) One series is 17,21,25,29….Another series is 16,21,26,31…..
Sum of first 100 terms common to both series is

Correct answer : 101100

Q.10) There are 10 letters . How many 5 lettered words can be formed if the letters may be repeated ?

Q.11) A answers a question correctly in 80% cases & B answers the same question correctly in 70% cases .What is the probability that both will not answer correctly is

Q.12) A & B think of a no. between 1 & 25 . If the nos. match they win a prize.What is the probability that they win in the first attempt ?
a) 1/25 b) 24/25 c) 2/25 d) none

Q.13) Solve differential equation dy = (sec x + y tan x) dx. Ans: y cos x = x

Q.14) Solve differential equation xdy - ydx + logxdx = 0 at ( x = 1, y = 1)

Q.15) Evaluate (2x-3)/(x*x + x + 1)**2 dx Ans: - 1/(x*x + x + 1) + constant

Q.16) Find the value of f(0) when f(x) = {1-cosx(1-cosx)}/x**4 is continuous.

Q.17) Find the value of Lt { e**x dx}/{ e**2x dx }
x0 [Lower lim=0, Upper lim=x in both integrals]

Q.18) Given x = sin inverse t, y = log ( 1 - t *t ) Find (d/dx)(dy/dx) at t = 0.5.

Correct answer : (-8/3)

Q.19) There are two groups having 5 questions in each group . In how many ways can you answer 6 questions taking maximum 4 from each group ?

Q.20) There are 3 persons A,B,C.Find the probability that A will come first and B will come before C.

Q.21) Sum of series 1 + ( 1+1/n) + 2(1+1/n)^2 + 3(1+1/n)^3 + … to n terms is

Q.22) 100 drops each of charge .. and radius … are joined to form a single drop.Which of the following is correct ?

Q.23) Value of a to make the function……...

Q.24) Arrange in the order of acidity of phenol, o-chlorel, nitro benzene.

Q.25) Two atoms having same atomic number and mass number are called -
a. isotope b. isober c. isomer d. isotone.

Q.26) A water drop having 0.3 micro coulomb charge in the field 50 volts per metre.What is the force ?

Aptitude
Q.31-33 (see GRE analytical ability)A Co. has to select 4 mechanical engineers out of 3 senior ( X,Y,Z)& 4 junior (A,B,C,D). 2should be senior & 2 should be junior. Following combinations are not allowed
i) A and Y
ii) Z and C
iii) A and B

Q.31) If A is selected who else are selected ? correct answer : X,Z,D

Q.34) The letters SURITI are arranged in all possible ways and the words are Arranged in alphabetical order.What is the rank of the word SURITI ?
a) 245 b)307 …

Q.35-36 In a certain code X………….. is written as 6………

Q.35) What will be MOON in that code ?

Q.36) Which word will have the code…… ? correct answer : FEAT

Q.37-39 A question is followed by 2 conditions A and B . Mark
a) only A is sufficient, B not necessary.
b) only B is sufficient, A not necessary.
a) A alone sufficient, B alone sufficient.
b) A and B together are necessary
Q.37 Is x> 0 ?
A.) x**2 + 1 = 0 B). x**3-1 = 0 Ans: b

Q.38) One man is standing near a light post of height 18 ft . What
is the length of the shadow?
A). height of man is 6 ft. B)he is standing 20 ft away from lamp post. Ans: d

Q.39) One train T1 starts from a town P towards Q .Another T2 starts from Q towards P .They meet at C .Which train has greater velocity ?
A) T2 reaches C before T1 B) ….. Ans. a

Q.40-42 see GRE logical ability e.g.
All cats are dogs
All dogs are rats
PART -2 (ELECTRICAL) 20 questions
Q.56) A gas is taken from state P1,V1,T1 to state P2,V2,T2 by two different paths. Which is constant ?
a) W b) Q c) Q
- W d) Q + W ans : c


Q.57) In a triode valve the value of saturation current can be increased by
a) increasing grid voltage
b) increasing plate voltage
c) increasing separation between ……….
d) ………..

Q.58) For producing photoelectricity collector is placed vertically over emitter & light is incident .An elec. field is applied downwards .What happens ?
c) photocurrent increases
d) K.E. of emitted electrons increases
c) …. d) …. Probable answer (b)

Q.59) In machines interpoles are provided
a)….. b) to improve comutation
c)….. d) due to variation of air gaps ans b

Q.60) In a CRO a beam has a horizontal swap of 1000Hz.It has 2 phases per cycle….. What is the rate of vertical sweep ?
a)500Hz b) 1000Hz c) 2000Hz d)5000Hz

Q.61) A condensor has dielectric of thickness 3 cm and permittivity 4. Another dielectric of thickness 4 cm and permittivity x is inserted so that capacitance of condensor is now 1/3 rd of original capacitance . Value of x is Ans: 3.3

Q.62) In a 3-phase 4-pole induction motor slip = 4%.Rotor speed = 720 rpm Supply frequency is
Ans: 25Hz

Q63) The stator of induction motor has supply frquency 50 Hz when rotor is circuited . The rotor is rotated at 1800 rpm in the direction of stator RMF.The value of rotor frequency is

Q.64) Which two of the following are in time domain ?
i) Nyquist plot
ii) Root locus
iii) Routh - Hurwitz
iv) Bode Plot

Q.65) The no. of zeroes in K(s+2)/s(s+2-j4)(s+2+j4) is
a) one b) two c) three d) none

Q.66) Routh Hurwitz criterion gives
a) no. of roots to the right of jw axis
b) no. of roots to the left of jw axis
c) no. of roots to the right of jw axis & on it
d) no. of roots to the left of jw axis & on it

Q.67) An induction motor shows loss of torque with vibrations. Possible cause is
a) bearings need greasing
b) there is short circuit c)…. d) ….

Q.68) In an RLC circuit R=20 ohm , L=0.5 H , C=10 microfarad.The resonant frequency , bandwidth ,…. are ans . 1414
rad/sec…….