InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 12401. |
(i) int (sin 2x)/((1+sin x)(2-sinx))dx (ii) int (cos x)/((1+sinx) (2-sinx))dx (iii) int (cos x)/((1-sinx)^2(2+sinx)) dx (iv) int ((3sinx-2)cosx)/(13-cos^2x-7 sinx) dx (v) int (sin theta)/((4+ cos^2 theta ) (2-sin^2 theta))d theta. |
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Answer» (II) `1/3` (III) `1/9` (iv) -7 (V) `1/6` |
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| 12403. |
The reflection of the point (6, 8) in the line x - y = 0 is |
| Answer» ANSWER :D | |
| 12404. |
Find the area bounded by the following curve : (i) f(x) = sinx, g(x) = sin^(2)x, 0 le x le 2pi (ii) f(x) = sinx, g(x) = sin^(4)x, 0 le x le 2pi |
Answer» Solution : As shown in the figure, the area bounded by `y = SIN X` and `y = sin^(2)x` is EQUAL to twice the area bounded by y = sin x and the x - axis for `x in [0, pi].` Now we KNOW that the area bounded by y = sin x and the x axis for `x in [0, pi]` is `overset(pi)underset(0)int sin x" " dx = 2 " sq. units"` Hence the REQUIRED area is 4 sq. units. |
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| 12405. |
The slope of the tangent to the curve x = t^2+3t-8, y = 2t^2-2t-5at the point (2,-1) is: |
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Answer» `(22)/(7)` |
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| 12407. |
A={(x,y):x,y in I, x ge 0, y ge 0 and 4x+5y le 40} B={(x,y):x, y in I, x gt 0, y ge 0 and 5x+4y le 40} |
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| 12408. |
Let A be a non-singular matrix of order 3 xx 3. Then I adj. A I is equal to : |
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Answer» `| A|^3` |
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| 12409. |
If A = [(1,2),(3,-5)] , B = [(1,0),(0,2)]and Xbe a matrix such that A = BX , then X is : |
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Answer» `[(2,4),(3,-5)]` |
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| 12410. |
A box contains 6 pens,2 of which are defective. Two pens are taken randomlyfrom the box. If r.v.X, number of defectivepens obtained , then standard deviation |
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Answer» <P>`+-4/(3sqrt(5))` Two pensare takenrandomly from the box. `:.` x can take values `0,1,2` `p(x=0) = (""^(4)C_(2))/(""^(6)C_(2)) = (4 xx3)/(6xx5) = 2/5 = 6/15` `p(x=1) = (""^(2)C_(1)xx""^(4)C_(1))/(""^(6)C_(2)) =(2xx4xx2xx1)/(6xx5)=8/15` `p(x=2)=(""^(2)C_(2))/(""^(6)C_(2)) = (1xx2)/(6xx5) = 1/15` `E(x) = 10/15` and `= 2/3` `E(x^(2)) = 12/15 = 4/5` Standad DEVIATION `= sqrt(E(x^(2)) - [E(x)]^(2))` Standard deviation `=sqrt((4/5)-(2/3)^(2))` `=sqrt(4/5-4/9) =sqrt((36-20)/(45))` `= sqrt((16)/(45)) = 4/(3sqrt(5))` |
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| 12411. |
Solve graphically 3x + 4y ge 12 |
Answer» SOLUTION :
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| 12412. |
The radius of the circle having maximum size passing through (2,4) and touching both the coordinate axes is |
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Answer» 5 |
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| 12413. |
r and n are positive integers r gt 1,n gt 2 and coefficient of (r + 2)^(th) term and 3r^(th) term in the expansion of (1 + x)^(2n) are equal, then n equals |
| Answer» ANSWER :C | |
| 12414. |
Points L, M and N lie on the sides AB, BC and CA of the triangle ABC such that l (AL) : l (LB) = l (BM) : l (MC) = l (CN) : l (NA) = m : n, then the areas of the triangles LMN and ABC are in the ratio |
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Answer» `(m^(2))/(N^(2))` |
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| 12415. |
Find the area bounded by the lines y=sqrt(2)x,x+sqrt(2)y=4,y=0 and y=sqrt(2). |
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| 12416. |
For|x|lt1,theconstantterm intheexpansionof(1)/((x -1) ^ 2 (x - 2 ))is |
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Answer» ` 2` `= ( x - 1 ) ^( - 2 )( x- 2 ) ^( -1) ` `= ( - 1) ^( -2)[ ( 1 - x) ^( -2) ] ( -2) ^( -1) [ ( 1 - (x)/(2) ) ^( -1) ]` `=( -1 ) /(2)( 1 -x ) ^( -2)(1 -(x ) /(2)) ^(-1) ` `=(-1)/(2) [ 1+ 2X+ 3x ^ 2+ ....][ 1+(x )/(2)+ (x ^ 2 ) /(4)+(x ^ 3 )/(8)+ ... ] ` `therefore ` constant term intheaboveexpansionis ` (-1)/(2) ` |
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| 12417. |
A factory makes tennis rackets and cricket bats. A tennis racket takes 1.5 hours of machine time and 3 hours of craftman's time in its making while a cricket bat takes 3 hour of machine time and 1 hour or craftman's time. In a day, the factory has the availability of not more than 42 hours of machine time and 24 hours of craftsman's time. (i) What number of rackets and bats must be made if the factory is to work at full capacity? (ii) If the profit on a racket and on a bat is Rs. 20 and Rs. 10 respectively, find the maximum profit of the factory when it works at full capacity. |
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Answer» Maximum profit of the FACTORY = Rs. 200 |
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| 12418. |
The locus of the point the chord of contact of tangents from which to the ellipse (x^2)/(a^2)+(y^2)/(b^2)=1. If (1"/"2,2"/"5) be the middle-point of the chord of the ellipse (x^2)/(25)+(y^2)/(16)=1, then that its length is |
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Answer» `(4)/(5)sqrt(39)` |
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| 12419. |
Assertion (A) a, b, c, d are position vectors of 4 points such that 2a - 3b + 7c-6d = 0rArr a, b, c, d are coplanar. Reason (R) Vector equation of the plane passing through three points whose position vectors are a, b, c is r = (1-x-y) a + x + yc. Which of the following is true? |
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Answer» Both (A) and (R) are TRUE and (R) is the CORRECT EXPLANATION of (A) |
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| 12420. |
Assertion (A) : The differential equaiton of the family of rectangular hyperbolas which have the coordinate axes as asymptotes is xy_(1) + y = 0 Reason (R) : The number of arbitrary constants in the general solution of differential equation is equal to the order of the differential equation. Then the statement among the following is |
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Answer» Both (A) and (R) are TRUE and R is CORRECT explanation of A |
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| 12421. |
If the vector a=3 hat(j)+4 hat(k) is the sum of two vectors a_(1) and a_(2), vector a_(1) is parallel to b=hat(i)+hat(j) and vector a_(2) is perpendicular to b, then a_(1)= |
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Answer» `1/2 (HAT(i)+hat(J))` |
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| 12422. |
Findtheareaofthe loop of thecurvey^2=x(1 - x) ^ 2 . |
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| 12423. |
If the projection of a line segment on thex, yand z -axes in 3 dimensional space are 2,3 and 6 respectively, then the length of the line segment is |
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Answer» 12 |
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| 12424. |
State which of the following are not the probability distributions of a random variable. Give reasons for your answer. |
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| 12425. |
Find the number of possible common tangents that exist for the following pairs of circles. x^(2) + y^(2) + 6x + 6y + 14 = 0 x^(2) + y(2) - 2x -4y -4=0 |
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| 12426. |
If 2x-y+1=0 is a tangent on the parabola which intersect its directrix at (1,3) and focus is (2,1), then equation of axis of parabola is |
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Answer» `11x-2y=24` `(x-2)/2=(y-1)/(-1)=(-2(4-1+1))/(4+1)=(-8)/5` `impliesx=2-16/5=(-6)/5` `y=8/5+1=13/5` `:.` Slope of DIRECTRIX `=(13/5-3)/((-6)/5-1)=(-2/5)/(-11/5)=2/11` `:.` Equation of AXIS, `=y=1=(-11)/2(x-2)` `implies2y-2=-1x+22` `implies11x+2y=24` |
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| 12427. |
int_(-1)^(1) (e^(|x|))/(1+a^(x))dx |
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Answer» `e` `I=int_(-1)^(1)(e^(|0-x|)/(1+a^(-x))dx` (by `int_(a)^(b)f(a+b-x)dx)` `I=int_(-1)^(1)(a^(x).e^(|x|))/(1+a^(x))dx`………(2) (1) `+` (2) `2I=int_(-1)^(1)e^(|x|)dx` `2I=2int_(0)^(1)e^(|x|)dx` `I=int_(0)^(1)dx=e-1` |
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| 12428. |
Let f(x)=" max "{x^(2),(1-x)^(2),2x(1-x)} where 0le x le 1. Determine the area of the region bounded by y=f(x), x-axis, x = 0 and x = 1. |
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| 12429. |
How many integers between 100 and 1000(both inclusive )consists of distinct odd digits ? |
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Answer» Solution :INTEGERS are to be formed with distinct odd DIGITS between 100 and 1000. The numbers between 100 and 1000 are of 3-digits. The odd digits are 1,3,5,7,9. The NUMBER of distinct 3-digit odd numbers`=""^5P_3=5*4*3=60` |
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| 12430. |
Using integration find the area of the region bounded by a triangle whose coordinates area (-2,0),(2,1),(-1,4). |
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| 12431. |
Statement - I : If n = 4m + 3 , is integer then i^(n) is equal to -iStatement- II : If n in N then (1 + i)^(2n) + (1- i)^(2n) is purely real number |
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Answer» Only I is TRUE |
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| 12432. |
Write the equation of the plane parallel to x-axis having intercepts 5 and 6 on y and z-axis respectively. |
| Answer» SOLUTION :The PLANE `2x+5z+1=0` is PARALLEL to zx-plane. | |
| 12433. |
If x+y=z, then cos^(2)x+cos^(2)y+cos^(2)z-2cosx.cosy.coszis equal to |
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Answer» Solution :`cos^(2)x+cos^(2)y+cos^(2)z-cosz(cos(x+y)+cos(x-y))` `=cos^(2)x+cos^(2)y+cos^(2)z-cos^(2)z-cos(x+y).cos(x-y)=1` |
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| 12434. |
For the equation of rectangular hyperbola xy = 18 |
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Answer» Length of transverse axis = length of conjugate axis = 12 |
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| 12435. |
Bag A contains 3 red and 2 balck balls and bag B contains 2 red and 3 black balls. One ball is drawn at random from box A and placed in B. Then again one ball is drawn at random from box B and placed in A. Find the probability that the composition of balls in the two boxes remains unaltered. |
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| 12436. |
If A is a 3xx3 non-singular matrix such that "AA"'=A'A and B=A^(-1)A', then "BB"' equals: |
| Answer» ANSWER :A | |
| 12437. |
Ify = tan^(1-) sqrt((x+1)/(x-1)) " for " |x| gt 1 " then " (dy)/(dx) = |
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Answer» `(-1)/(2|X|sqrt(x^(2)-1))` |
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| 12438. |
In triangle ABC (Fig 10.18), which of the following is not true : |
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Answer» `vec(AB)+vec(BC)+vec(CA)=vec(0)` |
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| 12439. |
If a, b in {1, 2, 3} and the equation ax^(2)+bx+1=0hasreal roots, then |
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Answer» `a GT B` |
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| 12440. |
Integration using trigonometric identities : int (d theta)/(sin theta* cos^(3) theta)=....+c |
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Answer» `LOG tan THETA+tan^(2)theta` |
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| 12441. |
A point on the parabola whose focus is S(1,-1) and whose vertex is A (1,1) is |
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Answer» `(3,(1)/(2))` |
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| 12442. |
If A+B+C = 2S , then P.T cos(S-A)+cos(S-B)+cos(S-C)+cosS=4cos.(A)/(2)cos.(B)/(2)cos.(C)/(2) |
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| 12443. |
if (1 + C_(1)/C_(0))(1 + C_(2)/C_(1)) (1 + C_(3)/C_(2)) ...... (1 + C_(n)/C_(n - 1))is |
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Answer» `(N+1)/(lfloorn)` |
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| 12444. |
If C_(0), C_(1), C_(2), …, C_(n) are binomial coefficients, then sum_(k=0)^(n) C_(k) sin kx cos (n-k) x equals |
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Answer» `2^(n) SIN NX` |
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| 12445. |
Football teams T_1 and T_2 have to play two games against each other. It is assumed that the outcomes ofthe two games are independent. The probabilities of T_1 winning. Drawing and losing a game against T_2 are (1)/(2),(1)/(6) and (1)/(3) respectively. Each team gets 3 points for a win. 1 point for a draw and 10 pont for a loss in a game. Let X and Y denote the total points scored by teams T_1 and T_2 respectively. after two games. |
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Answer» `(1)/(4)` |
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| 12446. |
The sides AC and AB of a Delta ABCtouch the conjugate hyperbola of the hyperbola (x^(2))/( a^(2)) -(y^(2))/( b^(2)) =1. If the vertex A lies on the ellipse(x^(2))/( a^(2))+(y^(2))/( b^(2))= 1,then the side BC must touch |
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Answer» PARABOLA |
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| 12447. |
Let f:A to B f (x) = (x +a)/(bx ^(2) + cx +2), where A represent domain set and B represent range set of function f (x) a,b,c inR, f (-1)=0 and y=1 is an asymptote of y =f (x) and y=g (x) is the inverse of f (x). Area bounded between the curves y = f(x) and y=g (x) is: |
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Answer» `2sqrt5 +ln ((3- SQRT5)/(5+sqrt5))` |
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| 12448. |
Let f:A to B f (x) = (x +a)/(bx ^(2) + cx +2), where A represent domain set and B represent range set of function f (x) a,b,c inR, f (-1)=0 and y=1 is an asymptote of y =f (x) and y=g (x) is the inverse of f (x). g (0) is equal to : |
| Answer» ANSWER :A | |
| 12449. |
Solve [[a+x,a-x,a-x],[a-x,a+x,a-x],[a-x,a-x,a+x]]=0 |
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Answer» SOLUTION :`[[a+x,a-x,a-x],[a-x,a+x,a-x],[a-x,a-x,a+x]]` or`[[3a-x,a-x,a-x],[3a-x,a+x,a-x],[3a-x,a-x,a+x]]=0` `(C_1=C_1+C_2+C_3)` `(3a-x)[[1,a-x,a-x],[1,a+x,a-x],[1,a-x,a+x]]=0` or, `(3a-x)[[1,a-x,a-x],[0,+2X,0],[0,-2x,+2x]]=0` `(R_2~~R_2-R_1,R_3~~R_3-R_2)` or, `(3x-x)XX1[[2x,0],[-2x,2x]]=0` or, `(3a-x)(4x^2-0)=0` `therefore` x=0, x=3a |
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| 12450. |
Let f:A to B f (x) = (x +a)/(bx ^(2) + cx +2), where A represent domain set and B represent range set of function f (x) a,b,c inR, f (-1)=0 and y=1 is an asymptote of y =f (x) and y=g (x) is the inverse of f (x). Area of region enclosed by asymptotes of curves y =f (x) and y=g (x) is: |
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Answer» 4 |
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