Explore topic-wise InterviewSolutions in Current Affairs.

This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.

1.

Find the number of positive integral solutions of x_1x_2x_3x_4x_5=210, such that x_1 ne 1

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ANSWER :`5^4-4^4`
2.

If int(1)/(x+x^(5))dx=f(x)+c, then the value of int(x^(4))/(x+x^(5))dx=.....

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`logx-F(X)+C`
`f(x)logx+c`
`f(x)-logx+c`
NONE of these

Answer :A
3.

If denotes the area bounded by f(x)=|(sin x+ cos x)/(x)| x-axis , x=piand x=3x , then

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`1 lt A lt 2`
`0 lt A lt 2`
`2 lt A lt 3`
NONE of these

Answer :D
4.

Find the points on the curve y = x^(3) at which the slope of the tangent is equal to the y-coordinate of the point.

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ANSWER :(0, 0), (3, 27)
5.

Identify the position isomer.

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SOLUTION :N//A
6.

Examine the consistency of the system of linear equtions in 1 to 6 2x-y=5 x+y=4

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ANSWER :`3 NE 0`
7.

For two vectors vec(a) and vec(b),|vec(a)|=4,|vec(b)|=3 and vec(a).vec(b)=6 find the angle between vec(a) and vec(b).

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ANSWER :`(PI)/(3)`
8.

int_(-1)^(3)(Tan^(-1)""(x)/((x^(2)+1))+Tan^(-1)""(x^(2)+1)/(x))dx=

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`2PI`
`PI`
`4PI`
`pi/2`

ANSWER :B
9.

If f(x)={((x-2)2^(-(1/(|x-2|)+1/(x-2))),x!=2),(0,x=2):} then f(x) at x=2 is

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Differentiable
Non-differentiable
R.H.L at x=2 is 1
None of these

Answer :B
10.

Match the conics in column I with statements/ex- pressions in Column II.

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<P>

Answer :`(a) -P, (B) -T; (C )-R; (D) -Q,S`
11.

The range of a random variable X is {0, 1, 2}. Given that P(X=0)=3c^(3),P(X=1)=4c-10c^(2),P(X=2)=5c-1 where c is constant. Find (i) the value of c (ii) P(X lt 1) (iii) P(1lt X le2) (iv) P(0lt X le3)

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Answer :i) `(1)/(3)` II) `(1)/(9)` iii) `(2)/(3)` IV) `(8)/(9)`
12.

Using integration, find the area of the region bounded by the triangle whose vertices are (0, 1), (2,2) and (3, 1).

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ANSWER :`3/2`
13.

int (dx)/(x(x^(n) + 1)) = c

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`(1)/(N) LOG |(X^(n))/(x^(n) + 1) | + C `
`(1)/(n) log | (x^(n) +1)/(x^(n))| + C `

ANSWER :A
14.

For which of the following function 9s) Lagrange's mean value theorem is not applicable in [1,2] ?

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`f (X)={{:((3)/(2)-x "," , x lt 3/2),(((3)/(2)-x)^(2)"," , x GE 3/2):}`
`f (x)={{:((sin (x-1))/(x-1)"," , x ne 1),( 1 "," , x =1):}`
`f (x)=(x-1) |x+1|`
`f (x) =|x-1|`

ANSWER :A
15.

If A and B are two events such that A subset B and P(B) != 0, then which of the following is correct?

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`P(A|B)=(P(B))/(P(A))`
`P(A|B) LT P(A)`
`P(A|B) GE P(A)`
None of these

Answer :C
16.

Show that int_0^a f(x) g(x) d x=2 int_0^a f(x) d x, if f and g are defined as f(x)=f(a-x) and g(x)+g(a-x)=4

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SOLUTION :`|X-1|` = {(x-1), x ge 1
`-(x-1), xlt 1`}
therefore `int_0^4 |x-1| dx`
=`int_0^1 (1-x) dx + int_1^4 (x-1) dx`
=`(x-x^2/2)_0^1 + (x^2/2 -x)_1^4`
`(1-1/2) +((16)/2 -4)-(1/2 -1)`
`=1/2+4+1/2 = 5.`
17.

dx + dy = (x + y) (dx -dy) rArr log (x + y) =

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x+y+C
x+2y+c
x-y+c
`2x+y+c^(3)`

ANSWER :C
18.

For the reaction : N_(2)(g)+3H_(2)(g) to 2NH_(3)(g),DeltaH=-24KCal " at " 427^(@)C and 200 atm. Calculate magnitude of internal energy change ( in Kcal DeltaU), if 168 gm N_(2) gas and 30 gm H_(2) gas are allowed to react completely (100% reaction yield ) to form NH_(3) gas at 427^(@)C and 200 atm.

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Solution :[0106]
MOLES of `N_(2)=(168)/(82)=6"" `Mole of `H_(2)=(30)/(2)=15` Limiting reagent is `H_(2)`
`DeltaU=DeltaH=Deltan_(g)RT`
`=(-24)xx5-(-2)xx(2)/(1000)xx700xx5=-106 kcal `
19.

Sum of the coefficients of (1+2x-4x^2)^(2003)

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1
2
3
`-1`

ANSWER :D
20.

One mole of N_(2) and 3.0 moles of PCl_(5) were placedin a 100-liter vessel and heated to 227^(@)C. The equilibrium pressure was 2.05" atm. "Assuming ideal behaviour, calculate X. Where X=1000xxK_(P) of the reaction at 227^(@)C.

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Solution : `{:("The reaction is",,"PCl"_(5)hArr"PCl"_(3)+"Cl"_(2)),(,,(g)""(g)""(g)),("Initial concn.",,3"moles"""0""0):}`
Concen. At equilibrium `""(3-3alpha)""3alpha""3alpha` where `alpha` is degree of dissociation of `PCl_(5).`
TOTAL moles of GASES in the vessel
`{:(=n=N_(2)(1" MOLE")+PCl_(5)(3-3alpha)+PCl_(3)(3alpha)+Cl_(2)(3alpha)),("moles""moles""moles"):}`
Or `n=4+3alpha`
USING the ideal gas equation `n=(PV)/(RT)=(2.05xx100)/(0.082xx500K)=5.0" moles "`
Or `4+3alpha=5" or "3alpha=1" or "alpha=1//3=0.333 ("degree of dissociation of" PCl_(5))`
Partial PRESSURE of `PCl_(5)=(2)/(5)xx2.05=0.82" atm."`
Partial pressure of `PCl_(3)=(1)/(5)xx2.05=0.41" atm. "`
Partial pressure of `Cl_(2)=(1)/(5)xx2.05=0.41`
`K_(P)=((0.41" atm")^(2))/((0.82" atm"))=0.205" atm."`
`X=0.205xx1000=205`
21.

If the 4th, 10th and 16th terms of a G.P. are x, y and z, respectively. Prove that x, y, z are in GP.

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ANSWER :` :. X, y, Z` are in G.P.
22.

Three persons A, B ,C in order toss a die. The person who first throws 1 or 2 wins. The ratio of the probabilities of their success is

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`4:6:9`
`6:9:4`
`9:4:6`
`9:6:4`

ANSWER :D
23.

Consider a quadraticequaiton az^(2) + bz + c=0, where a,b,c arecomplex number. The condition that theequation has onepurely imaginary root is

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`(cbara -abarc)^(2)= (b barc+ cbarb)(abara - bara b)`
`(cbarc -abarc)^(2)= (b barc - C bar a)^(2) (abarb +bar a b)`
`(c bara - a barc)^(2) = (b bar c + c bar b) (a bar b + a bar b)`
None of these

Solution : Let`z_(1)` (purely imginary ) be a root of thegivenequationThen,
`z_(1) = - barz_(1)`
and`underline(az_(1)^(2) + bz_(1) + c)=0""(1)`
`rArr az_(1)^(2) + bz_(1) + c = 0`
`rArr bara barz_(1)^(2) + barb barz_(1) + c = 0`
`rArr bar z bar z_(1)^(2) + bar b bar z_(1) + barc = 0`
`rArr bar a bar z_(1)^(2) - bar b barz_(1) + barc = 0""(as barz_(1) = - z_(1))""(2)`
Now Eqs. (1) and (2) musthave one common root.
`therefore ( cbara-abarc)^(2) =(barbc+ cbarb) (-abarb - barab)`
Let `z_(1)` and `z_(2)` be two purely IMAGINARY ROOTS. Then,
`barz_(1) = -z_(1), barz_(2) = - z_(2)`
Now , `underline(abarz^(2) + bz + c) = 0""(3)`
or `AZ^(2) + bz + c=bar0`
or `bara barz_(20 + barb barz + barc =0`
or `bara z^(2) - barbz + barc = 0""(4)`
Equations (3) and (4) must be identical as their roots are same.
` therefore (a)/(bara) = -(b)/(barb)=(c)/(barc)`
`rArr abarc = barac,+ barab = 0` and `b barc +barbc=0`
. Hence, `barac` is purely real and `abarb` and `bbarc`are purely imaginary .
let `z_(1)` (purely real ) be a root of the givenequation . Then ,
`z_(1) = barz_(1)`LTBR gt and ``underline(az_(1)^(2) + bz_(1) + c)= bar0""(5)`
or `az_(1)^(2) + bz_(1) + c=0`
or `baraz_(1)^(2) + bz_(1) + c = bar0`
or `baraz_(1)^(2) + barb z_(1) + c= 0""(6)`
Now(5) and (6) must have one common root. Hence,
`(cbara - abarc)^(2) = (b barc - cbarb)(abarb-barab)`
24.

The value of I=int_(-pi//2)^(pi//2) sqrt( cos x - cos^(3) x)" "dxis

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`0`
`2//3`
`4//3`
`1//3`

ANSWER :C
25.

Ifalpha, beta , gammaare therootsof x^3 -6x -4=0thentheequationwhoserootsare(betagamma+(1)/( alpha)) ,(gammaalpha+(1)/(beta)) , (alphabeta+(1)/( gamma))is

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`4x^3 -30 x^2 +125 =0`
`x^3 +15x^2 -120=0`
`4x^3 +30 x^2 -125=0`
`4x^3 -30x^2 -125=0`

ANSWER :C
26.

Evaluate the limit. underset(n to 00)("lim") (sqrt(n+1)+sqrt(n+2)+……..+ sqrt(n+n))/(nsqrt(n))

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ANSWER :`(2)/(3)(2sqrt(2) - 1)`
27.

At anelectionthreewardsof atownof aarecanvassedbyby 3,4, and 5 menrespectivelyif 20menvolunteer, in howmanycan theybeallotedto thedifferentwards ?

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`""^(20)C_(5)`
`""^(17)C_(4)`
`""^(13)C_(5)`
`""^(20)C_(3).""^(17)C_(4).""^(13)C_(5)`

Answer :D
28.

Let f(x)=[sqrt(n)+1/2] where [.] denotes greatest integer function AA, n epsilonN Then sum_(n=1)^(oo)(2^(f(n))+2^(-f(n)))/(2^(n)) is equal to ………

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ANSWER :2
29.

If a,b,c are sides of DeltaABC such that |{:(c,bcosB+cbeta,acosA+balpha+cgamma),(a,c""cosB+abeta,bcosA+calpha+agamma),(b,acosB+b""beta,c""cosA+aalpha+bgamma):}|=0 ("where" alpha,beta,gamma in R^+ and angleA,angleB,angleC ne pi//2) then DeltaABC is

Answer»

isosceies
equiliteral
can't SAY
RIGHT ANGLED

ANSWER :B::D
30.

The position vector of a point lying on the line joining the points whose position vectors are hati+hatj-hatk and hati-hatj+hatk is

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`HATJ`
`HATI`
`HATK`
`hat0`

ANSWER :B
31.

If f(x)= x^(2) sin ((1)/(x)), where x ne 0, then the value of the function f at x=0, so that the function is continuous at x= 0, is

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0
`-1`
1
None of these

Answer :A
32.

Answer the following: If 6th term in the expansion of (x+*)^n is equal to "^nC_5x^(n-10) find *.

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Solution :Let 6th TERM of `(x+y)^N` is `^nC_5x^(n-10)`
` THEREFORE "^nC_5x6(n-5)y^5 = ^nC_5x^(n-10) = ^nC_5x(n-5).x^-5`
`y^5 = x^-5 = 1/x^5`
`therefore y = 1/x`. HENCE = 1/x
33.

IfA= cos 15^(@) - cos 75^(@) , B= tan 15^(@) + tan 75^(@) , C=cos^(2) 45^(@) - sin^(2) 15^(@)then ascending order is

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A,B,C
C,A,B
B,C,A
C,B,A

ANSWER :B
34.

If : int_(0)^(pi)ln(sin x) dx = k, then : int_(0)^(pi//4)ln (1+tan x)=

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`-(K)/(4)`
`(k)/(4)`
`-(k)/(8)`
`(k)/(8)`

ANSWER :C
35.

A, B, C are three points on a vertical pole whose distances from the foot of the pole are in A.P. and whose angles of elevation at a point on the ground are alpha, beta and gamma respectively. If alpha + beta + gamma = pi, then tan alpha tan gamma is equal to

Answer»

3
2
1
-1

Answer :A
36.

Find the equation of a straight line in the plane vecr.vecn=d which is parallel to vecr.vecn=d("where "vecn.vecb=0).

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`vecr=veca+((d-veca.VECN)/(N^(2)))vecn+lamdavecb`
`vecr=veca+((d-veca.vecn)/(n))vecn+lamdavecb`
`vecr=veca+((veca.vecn-d)/(n^(2)))vecn+lamdavecb`
`vecr=veca+((veca.vecn-d)/(n))vecn+lamdavecb`

Solution :Foot of the perpendicular from POINT `A(veca)` on the plane `vecr*vecn=d` is `veca+ ((d-veca*vecn))/(|vecn|^(2))vecn`
Therefore, EQUATION of the LINE parallel to `vecr=veca+lamdavecb` in the plane `vecr*vecn =d` is given by
`""vecr=veca+ ((d-veca*vecn))/(|vecn|^(2))vecn+lamdavecb`
37.

If the equation 3x^(2)+3y^(2)+10xy+16y+k=0 represents a pair of line, then k=

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`-16`
`192`
`-12`
`12`

ANSWER :C
38.

The oxidation state of Cr in K_(3)CrO_(8).

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SOLUTION :
`:.` OXIDATION STATE of Cr=+5
39.

Find (dy)/(dx) in the following x^(2) + xy + y^(2) = 100

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ANSWER :`(-(2X + y))/(x+2y)`
40.

For the plane prod= 4x – 3y + 2z – 3 = 0, the points A = (- 2, 1, 2), B = (3, 1, - 2) 1) lie on the same side of prod = 0

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LIE on the same side of `PROD = 0`
LINE on the opposite sides of `prod = 0`
lie on the NORMAL to `prod= 0`
None

ANSWER :B
41.

If f(x) = int_0^x tsint dt, then find f^'(x)

Answer»

cosx+xsinx
X sinx
x cosx
sinx + x cosx

Answer :B
42.

int_(0)^(1)(2x+3)(sqrt(3-2x))dx

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ANSWER :`(21sqrt(3)-9)/(5)`
43.

If f(t) = int_(-t)^(t) (e^(-|x|))/(2) dx, then underset(t to oo)(lim) f(t) is equal to

Answer»

1
`1/2`
0
`-1`

ANSWER :A
44.

(dy)/(dx) + y = 1( y ne 1)

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ANSWER :`y = 1 + AE^(-X)`
45.

If the circles x^(2) + y^(2) - 2lambda x - 2y - 7 = 0 and 3 (x^(2) + y^(2)) - 8x + 29 y = 0 are orthogonal the lambda is equal to

Answer»

4
3
2
1

Answer :d
46.

The probability that a man can hit a target is 3/4. He tries 5 times the probability that he will hit the target at most one time is

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`(1/4)^(3)`
`(3/4)^(5)`
`(1/4)^(2)(3/4)^(3)`
NONE of these

Answer :A
47.

If the plane 2x + 3y + 4z=1 intersects X-axis, Y-axis and Z-axis at the points A, B and C respectively, then the centroid of a Delta ABC is …....

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`((2)/(3) , 1, (4)/(3))`
`(6,.9,12)`
`((1)/(6), (1)/( 9) , (4)/(12))`
`((1)/(2) ,(1)/(3) , (1)/(4))`

ANSWER :C
48.

Using elementary transformations, find the inverseof the matrices [(4,5),(3,4)]

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ANSWER :`[(4,-5),(-3,4)]`
49.

If x = 1 + i is a root of x^(3) - ix + 1 - i = 0 , then the quadratic equation whoseroots are the remain - ing two roots of x^(3) - ix + 1 - i = 0 is

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`x^(2) + (1 + i) x + 1 + I = 0`
`x^(2) + (1 + i) x + I = 0`
`x^(2) + 2 (1 + i) x - 2 = 0`
NONE of these

Answer :B
50.

Let the images of the point A(2, 3) about the lines y=x and y=mx are P and Q respectively. If the line PQ passes through the origin, then m is equal to

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`(3)/(2)`
`(2)/(3)`
`-1`
5

Answer :C