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.

If g''(x) is continuous for all x, g(0) = g'(1) = 1 and if int_0^1 x g^'' (x) dx vanishes, then g(1) is:

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1
2
3
`-2`

ANSWER :B
2.

Find the length of the major axis, minor axis, latus rectum, eccentricity, centre, foci and the equations to the directrices of the ellipse. (i) 3x^(2) + y^(2) -6x -2 y -5 = 0

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Answer :`e=(sqrt(3))/(2)` foci, `(1+-1+- sqrt(3))`, 1 LENGTH of latus RECTUM =1
EQUATION of directrix `y sqrt(3)+sqrt(3)+-4=0`
3.

If f(x)=2x^(2), find (f(3.8)-f(4))/(3.8-4) :

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0.156
15.6
156
1.56

Answer :B
4.

Let a and p be the roots of equation x^2 + x - 3 = 0. Find the value of the expression 4p^2 - a^3.

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ANSWER :19
5.

The shortest distance between the lines 2x + y + z - 1 = 0 = 3x + y + 2z - 2 and x = y = z, is

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`(1)/(SQRT2)` UNITS
`(1)/(SQRT3)` units
`(1)/(SQRT4)` units
`(1)/(sqrt5)` units

Answer :A
6.

An antiderivative of the integral inte^(x)((1-x)/(1+x))^(2)dx is

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`E^(X)(1+x^(2))^(2)`
`(-XE^(x))/((1+x^(2))^(2))`
`(e^(x)(1-x))/((1+x^(2)))`
`(e^(x))/(1+x^(2))`

ANSWER :D
7.

The points representing the complex numbers z for which |z+4|^2-|z-4|^2 = 8 lie on

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a straight line PARALLEL to x-axis
a straight line parallel to y-axis
a circle with centre as origin
a circle with centre other than the origin

ANSWER :B
8.

The sum of the cofator of the elements in second column in |{:(7,9,1),(10,8,1),(12,10,1):}| is …….

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1
`-4`
0
5

Answer :C
9.

The differential equation of the family of parabolas y^(2)=4ax where a is parameter is

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Answer :`y^(2) - 2xy(DY)/(DX) = 0`
10.

Let f(x)=ax^(2)+x+3andf(x)ge0AAx inR,AAainA" where "AsubR. "Also "L=Lim_(xto oo) (x+1-sqrt(ax^(2)+x+3)). Which one of the following statement is incorrect ?

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If L exist then a=1.
If L does not exist then range of a is `[(1)/(12),1)uu(1,oo)`.
`|f(X)|` is continuous and differentiable `AAx in R,AAainA`
`f(|x|)` is non-derivable at EXACT,y two points.

Solution :(i) `"As "ax^(2)+x+3ge0AAx inR`
`"So, "agt0andDiscle0rArr1-12ale0rArr1le12arArrge(1)/(12)`
`"So,"ain[(1)/(12),oo)`.
(II) `L=underset(xtooo)Lim(x+1-sqrt(ax^(2)+x+3))=L=underset(xtooo)Lim((x+1)^(2)-(ax^(2)+x+3))/((x+1)+sqrt(ax^(2)+x+3))=L=underset(xtooo)Lim((1-a)x^(2)(2a-1)x-2)/((x+1)+sqrt(ax^(2)+x+3))`
`rArrL={{:(oo_(,),if,ain[(1)/(12)_(,))),((1)/(2)",",if,a=1),(-oo_(,),if,ain(1_(,)oo)):}`
Now, werify alternatives.
11.

Evaluation of definite integrals by subsitiution and properties of its : If anti derivative of f(x)=(sinx)/(x) is F(x) then int_(1)^(3)(sin2x)/(x)dx=.........(xgt0)

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`F(6)-F(2)`
`(1)/(2)(F(6)-F(2)]`
`(1)/(2)(F(3)-F(1)]`
`2(F(6)-F(2)]`

Answer :A
12.

A factory produces bulbs. The probability that any one bulb is defective is (1)/(50)and they are packed in 10 boxes. From a single box, find the probability that, (i) none of the bulbs is defective (ii) exactly two bulbs are defective (iii) more than 8 bulbs work properly.

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Answer :`(i) ((49)/(50))^(10) (ii) 45 XX ((1)/(50))^(10) *(49)^(8) (iii) ((49)^(9)*59)/((50)^(10))`
13.

(i) Solve :4 sin ^(-1) .(5)/(x) + sin ^(-1).(12)/(x)=(pi)/(2) (ii)slove :sin ^(-1).(5)/(x)+ sin ^(-1).(12)/(x) =(pi)/(2)

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ANSWER :(i) `(1)/(2)` (II) 13
14.

If the mean of the data7,8,9,7,lambda , 8,is 8then variance of the data is:

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2
1
`( 7)/(8) `
`( 9)/(8)`

Answer :B
15.

Lt_(xto0)(x^(2))/(int_(0)^(x)Tan^(-1)tdt)

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2
`1/2`
`-2`
4

Answer :A
16.

If 10 coins are tossed, find the probability that no two or more consecutive heads occur.

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ANSWER :`(9)/(64)`
17.

Show that a point at which the line (x)/(a)+(y)/(b)=1 touches to the curve y=be^(-(x)/(a)) lies on Y-axis.

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ANSWER :`m_(1)=m_(2)`
18.

-a/6-a gt -4/3 Which of the following is equivalent to the inequal ity above?

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`a LT 7/8`
`a gt 7/8`
`a lt 8/7`
`a gt 8/7`

SOLUTION :Begin by multiplying all parts of the inequality by 6 to clear the fractions` -a -6a gt - (24)/(3),` which, when simplified, is `-7a gt -8,.` Divide both sides by `-7,` remembering to switch the direction of the SIGN: `a lt 8/7.` Therefore (C ) is correct.
19.

Differentiate (1-tanx)/(1+tanx)

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SOLUTION :`(1-tanx)/(1+tanx)`
`d/dx(1-tanx)(1+tanx)`
`((-1+tanx)xxd/dx(1+tanx))/((1+tanx)^2)`
`(-sec^2x(1+tanx)-(1-tanx)sec^2x)/((1+tanx)^2)`
`=(-2sec^2x)/((1+tanx)^2)`
20.

2(2x+3) -10 lt 6 (x-2)

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ANSWER :(4,`OO`)
21.

If x satisfies the inequations2x - 7 lt 11 , 3x + 4 lt -5 , then x lies in the interval

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`(-OO , 3)`
`(-oo, 2)`
`(-oo, -3)`
`(-oo, oo)`

ANSWER :C
22.

If PN is the ordinate of a point P on the ellipse x^2/a^2+y^2/b^2=1 and the tangent at P meets the x-axis atT then show that (CN) (CT)=a^2 where C is the centre of the ellipse.

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ANSWER :`a^(2)`
23.

I : Ifcos A =(3)/(4) " then " cos""(A)/2 cos""(5A)/(2) =-7 II : Ifsin (120^(@) - alpha ) = sin(120^(@) - beta ) and 0 lt alpha , beta lt pi" then " alpha + beta + 60^(@)

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only I is TRUE
only II is true
both I & II are true
NEITHER I nor II are true

Answer :C
24.

Three are two balls in an urn whose colours are not known (each ball can be either white or black). A white ball is put in the urn. A ball is drawn from the urn. Find the probability that it is white.

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ANSWER :`(2)/(3)`
25.

Using 6 different flags, how many different signals can be made by using atleast three flags, arranging on above the other ?

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ANSWER :1920
26.

70 is 250% greater than what number?

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ANSWER :20
27.

Lt_(n rarr oo)[(n^(2))/((n^(2) +1)^(3//2))+(n^(2))/((n^(2) + 2)^(3//2))+...+(n^(2))/([n^(2)+(n-1)^(2)]^(3//2))]

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ANSWER :`(1)/(SQRT(2))`
28.

Consider the following set ofreactions: CHCl_(2)COOH+NaOH to CHCl_(2)COONa+H_(2)O "" DeltaH_(1)=-12830 Cal HCl+NaOH to NaCl to NaCl+H_(2)O "" DeltaH_(2)=-13680 Cal. NH_(4)OH+HCl to NH_(4)Cl+H_(2)O "" DeltaH_(3)=-12270 Cal. Select the correct option(s) :

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Enthalpy of neutralization of `CHCl_(2)COOH` by `NH_(4)OH` is `-11420 Cal.`
Enthalpy of DISSOCIATION of `NH_(4)OH=1410 Cal`
Enthalpy of dissociatiion of `NH_(4)OH=1410 Cal `.
Enthalpy change for the reaction `H_(2)O to H^(+)+OH^(-) is -13680 Cal `

Solution :(A),( C)
`DeltaH=DeltaH_(1)+DeltaH_(3)-DeltaH_(2)`
`=-(12830+12270-13680)`
`=-11420 Cal`
(B) `DeltaH_(2)-DeltaH_(1)=13680-12830`
`=850 Cal`
(C) `DeltaH_(2)-Delta_(3)=13680-12270`
`=1410 Cal`
(D) `H_(2)O to H^(+)+OH^(-)`
`=+13680K`
29.

Let f be a real valued function defined as f: R to R f(x) =|x^(2) -6x +8| sin((x-2)Pi) + |e^(x) -1|sin x+|x^(2)|) The number of points of non-differentiability is

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4
3
2
0

Solution :`|X^(2) - 6x +8|` is non diferentiable at x=2,4. at x=2, `sin((x-2)pi)=0`
`x=4 sin((x-2)pi)=0`
So, `|x^(2)- 6x +8| sin((x-2)pi)` is differentiable everywhere
SIMILARLY, `|e^(x)-1|` SINX is differentiable everywhere and `(x^(3))` is differentiable everywhere.
30.

inttan^(-1)xdx=xtan^(-1)x+f(x)+C, " find "f(x).

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ANSWER :`F(X)=-1/2logabs(1+x^(2))`
31.

Number of real solution of (x-1)(x+1)(2x+1)(2x-3)=15(1)is

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0
2
3
4

Answer :B
32.

The value of the integral I=int_(0)^(a) (x^(4))/((a^(2)+x^(2))^(4))dx is

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`(1)/(16a^(3))((pi)/(4)-(1)/(3))`
`(1)/(16a^(3))((pi)/(4)+(1)/(3))`
`(a^(3))/(16)((pi)/(4)-(1)/(3))`
`(a^(3))/(16)((pi)/(4)+(1)/(3))`

SOLUTION :Putting x=a tan `theta` in the given integral, we get
`I=(1)/(32a^(3))OVERSET(pi//4)underset(0)int(2-cos2theta-2cos2theta+cos6theta)d theta`
`rArrI=(1)/(32a^(3))[2theta-(sintheta)/(2)-(sin4theta)/(2)+(sin6theta)/(6)]_(0)^(pi//4)=(1)/(16a^(3))((pi)/(4)-(1)/(3))`
33.

If A is an orthogonal matrix , then |A| is :

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0
`-1`
1
`pm1`

ANSWER :D
34.

In the matrix [{:(2,5,19,-7),(35,-2,(5)/(2),12),(sqrt(3),1,-5,17):}] , write : (i) The order of the matrix , (ii)The number of elements, (iii) Write the elements a_(13),a_(21),a_(33),a_(24),a_(23),

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ANSWER :(i) `3xx4`.
(II) `=12`.
`=(5)/(2)`.
35.

If a machine is correctly set up, it produces 90% acceptable items. If it is incorrectly set up, it produces only 40% acceptable items. Past experience shows that 80% of the set ups are correctly done. If after a certain set up, the machine produces 2 acceptable items, find the probability that the machine is correctly setup.

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ANSWER :0.95
36.

If (x^(2))/(x^(6)-1)=(A)/(x-1)+(B)/(x+1)+f(x) then find the value of f(2)

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ANSWER :`F(2)= -1/21`
37.

A bag A contains 3 white and 2 black balls and another bag B contains 2 white and 4 black balls. A bag and a ball out of it are picked at random. What is the probability that the ball is white?

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ANSWER :`(1)/(3)`
38.

Using the fact that sin (A +B) = sin A.cos B+ cos A sin B and the differentiation, obtain the sum formula for cosines.

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ANSWER :`COS A cos B- SIN A sin B`
39.

if(-pi)/(2)lt thetalt pi/2andnthetane_0 pi/4 , thenvalueofcot((pi)/(4) + theta)cot((pi)/(4)- theta) is

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0
`-1`
`1`
`-2`

ANSWER :C
40.

Let A = N xx N and ** be the binary opertion on A defined by (a,b) ** (c,d) = (a + c, b+d) Show that ** is commutative and associative.

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41.

I: The equation of the plane through the points (1, -2, 2), (3, 1, - 2) and perpendicular to the plane x + 2y – 3z = 5 is x + 16y – 11z + 37 = 0 II : The equation of the plane passing through (1, – 2, 4), (3, -4,5) and parallel to x-axis is y + 2z – 6= 0

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only I is TRUE
only II is true
both I and II are true
neither I nor II are true

Answer :B
42.

If x = ( 2 + sqrt( 3))^(n), then find the value of x( 1- { x} ), where {x} denotesthe fractional part of x

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1
2
`2^(2N)`
`2^(N)`

ANSWER :A
43.

Find the number of terms in the expansion of (3p+4q)^(14)

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ANSWER :15
44.

Suddenly, the Desert God emerges out of the faucet. He says, “I am pleased with your hard-work, and will reward you with food if you pass my challenge.” He gives you infinite number pieces of five different types as shown below with numbers etched on them. He then tells you to use a maximum of 30 of these pieces to make a rectangle such that the sum of the numbers on all of the small squares is maximum. Also, each type should be used at least once. What is maximum sum of all the numbers that is possible?

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137
136
127
Rectangle cannot be formed

Solution :The smallest rectangle/square that can be made using the most valued PIECE is a 4X4 square as shown below.

So of the 30 pieces we can use 4*n pieces to get the maximum score possible. n COMES out to be 6 not 7,since we need to use the rest of the pieces atleast once. As for the remaining 6 pieces , the maximum scores possible is using the following arrangement-

THUS the RESULTING arrangements is -

Thus the maximum points possible is : 6*(4*4*5) + 4*4*2 + 4*3*2 + 4*2 + 4*1 = 137*4 = 548.
45.

The surface area of the solid of revolutionof the region bounded by y=2x,x=0 and x=2 about x-axis is…..

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`8sqrt5pi`
`2sqrt5pi`
`sqrt5pi`
`4sqrt5pi`

ANSWER :a
46.

Find derivatives of the following functions. (x^2 + 5)^8

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SOLUTION :`y = (x^2 + 5)^8
dy/dx = d/dx(x^2 + 5)^8= 8(x^3 + 5)^7xx d/dx(x^2 +5)`
by chain rule = `8(x^2 + 5)^7 .2X = 16X(x^2 + 5)^7`
47.

int (cos x)/(3 cos x + 4 sin x )dx =

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`(3)/(25) x + (4)/(25)` log | 3 COS x+ 4sin x | + C
`(3)/(25) x - (4)/(25)` log | 3 cos x+ 4sin x | + C
`(2)/(25) x - (4)/(25)` log | 3 cos x+ 4sin x | + C
`(1)/(25) x - (3)/(25)` log | 3 cos x+ 4sin x | + C

Answer :A
48.

f:X to Y is onto, if and only if1. range of f=Y2. range of f neY3. range of f lt Y4. range of f ge Y

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RANGE of F=Y
range of `f neY`
range of `f LT Y`
range of `f GE Y`

Answer :A
49.

If |bar(x)|=|bar(y)|=2 and (bar(x)" "^(hat)bar(y))=theta then |bar(x)-bar(y)cos theta| = ………..

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`2SIN""(THETA)/(2)`
`sqrt(2)SIN""(theta)/(2)`
`sqrt(2)sin theta`
`2 sin theta`

Answer :D
50.

2lezle4 {:("Quantity A","Quantity B"),((2x)/(5),(5)/(22)):}

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QUANTITY A is greater.
Quantity B is greater.
The TWO quantities are equal.
The relationship cannot be DETERMINED from the infromation given.

Answer :D