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. |
Write down the equation of x-axis. |
| Answer» SOLUTION :Equation of the LINE through (1,2,3) and PARALLEL to the VECTOR `3overset^i+2overset^j-2overset^k` is `_r^rarr=(overset^i+2overset^j+3overset^k)+lambda(3overset^i+2overset^j-2overset^k)` | |
| 2. |
Let f(x)={:[(x^(2)","xge0),(-x^(2)","xlt0):}, then : |
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Answer» `f(X)` is not DERIVABLE at `x=0` |
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| 3. |
Figure shows a practical situation.The event is observed by four observer.List-II gives the value of acceleration and intial velocity of ball as observed by observer given in List-I . Match them correctly : -(g=10 m//s)^2 |
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Answer» P`to`1, Q`to`3 , R`to`2, S`to`4 |
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| 4. |
A plane passes through (1,-2,1) and is perpendicular to two planes 2x-2y+z=0 and x-y+2z=4. The distance of the plane form the point (1,2,2) is |
| Answer» ANSWER :D | |
| 5. |
Solve in R and represent the solution on the number line. 2x + 1 ge 0 |
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Answer» Solution :`2x+1 GE 0` `rArr 2x ge -1` `rArr X ge (-1)/2` If x `in` R then the solution set is S = `[ (-1/2), INFTY) We can represent the solution on number line as
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| 6. |
Consider two positive integer a and b. Find the least possible value of the product ab if a^(b)b^(a)is divisible by 2000 |
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| 7. |
During contraction and relaxation of striated muscle fibre the length of A band usually :- |
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Answer» REMAINS same and does not CHANGE |
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| 8. |
x+y=2 and x-y=2 are tangents on a parabola at (1,1) and (4,2) respectivley. Which of the followings is/are correct. |
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Answer» EQUATION of directrix is `x+3y=2` Point of intesection `=(2,0)` mid-point of `(1,1)` & `(4,2)` is `(5/2,3/2)` Slope of axis`=(3/2-0)/(5/2-2)=3` Equation of directrix `y=-1/3(x-2)` Equation of directrix `y=-1/3(x-2)` `x+3y=2` `AB` is focal CHORD, `BS=` (`_|__(R)` distance from `B` on directrix) `=(4+6-2)/(sqrt(10))=8/(sqrt(10))` `AS=` ( `_|__(r)` distance from `A` on directrix) `=(1+3-2)/(sqrt(10))=2/(sqrt(10))` So, focus divides `AB` in `1:4` RATIOS. So `S=(8/5, 6/5)`
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| 9. |
If f(x) is a differentiable function wherever it is continuous and f'(c_(1))=f'(c_(2))=0, f''(c_(1)).f''(c_(2)) lt 0,f(c_(1))=5,f(c_(2))=0 and (c_(1) lt c_(2)) If f(x) is continuous in [c_(1),c_(2)] and f''(c_(1))-f''(c_(2)) gt 0, then minimum number of roots of f'(x)=0 in [c_(1)-1, c_(2)+1] is |
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Answer» 2 |
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| 10. |
Solvefollowingsystem usingmatrixx-y+2z =1, 2y -3z =1, 3x -2y +4z =2 |
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| 11. |
If |veca|=1,|vecb|=2 and veca*vecb=1. Then the angle between veca and vecb is : |
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Answer» `FRAC{PI}{2}` |
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| 12. |
Show that, int_(0)^((pi)/(4))(sinx+cosx)/(cos^(2)x+sin^(4)x)dx |
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| 13. |
For any two vectors bara" and "barb show that |bara.barb|le|bara||barb| (Caucy- Schwartz inequality). |
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| 14. |
Prove that : Find the 8^("th")" term of "(1-(5x)/(2))^(-3//5) |
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| 15. |
If the normal at one end of the latusrectumof the parabola y^(2)=16x meets the X-axis at the point P, then the length of the chord passing through P and perpendicular to the normal is |
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Answer» `48 SQRT(2)` |
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| 16. |
If the area of the triangle with vertices (2,-6),(5,4) and (K,4) is 35 sq. units, then find the values of K, using determinants. |
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| 17. |
If the sum of n terms of an A.P. is n P +(1)/(2) n (n - 1) Q ,where P and Q are constants,then the common difference is |
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Answer» 1 |
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| 18. |
int_(0)^(pi//2)(cos^(3)x)/(sinx+cosx)dx= |
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Answer» `(pi-1)/(2)` |
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| 19. |
Differentiate w.r.t x the function cos (a cos x + b sin x), for some constant a and b |
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| 20. |
Let A be a square matrix of order 2x2 thenabs[KA] is equal to |
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Answer» k|A| |
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| 22. |
Let Akbar and Birbal together have n marbles where n gt 0. Akbar says to Birbal "If I give you some marbles then you will have twice as many marbles as I will have".Birbal says to Akbar" If I give you some marbles then you will have thrice as many marbles as I will have" What is the minimum possible value of n for which the above statements are true ? |
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| 23. |
Which of the following will not give any colout to flame? |
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Answer» Be |
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| 24. |
Evaluate the following integrals inte^(x)((x+2))/((x+3)^(2))dx |
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| 27. |
For what value of x, the matrix [(5-x,x+1),(2,4)] are singular. |
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| 28. |
If x, y, z are in A.P then e^(-x),e^(-y)and e^(-z) are |
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Answer» A.P |
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| 29. |
The radius of the smallest circle, which passes through the points of intersection of the circles : x^2+y^2+2x-3=0 and x^2+y^2 +3x-y=0 is : |
| Answer» ANSWER :C | |
| 30. |
The value of sqrt(8 + 2 sqrt(8 + 2 sqrt(8 + 2 sqrt(8 + . . . . ))))is |
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Answer» 10 |
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| 31. |
Evaluate:int _0^((pi)/(2))(sin ^(2) x .cos ^(2) x )/((sin ^(3) x+ cos ^(3) x)^(2)) dx |
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| 32. |
Find the shortest distance between the lines whose vector equations are vecr=(1-t)hati+(t-2)hatj+(3-2t)hatk and vecr=(s+1)hati+(2s-1)hatj-(2s+1)hatk. |
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| 33. |
Two of the three values of (-1)^(1//3) are cos(pi//3)+isin(pi//3),cos(5pi//3)+isin(5pi//3).The third value is |
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Answer» `COS(pi//3)-ISIN(pi//3)` |
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| 34. |
How many +ve integers can be formed using 0,1,2 which are less than 10^n where n is +ve integer |
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| 35. |
A circular ring of radius 3 cm is suspended horizontally from a point 4 cm vertically above the centre by 4 strings attached at equal intervals to its cirumference . If the angle between two consecutive strings be theta,then cos 0- |
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Answer» `4/5` `therefore angleAOB=90^@` Also, in `triangleAOP`, we have `AP=sqrt(OA^2+OP^2)=sqrt(3^2+4^2)=5` `rArr` BP=AP=5 In `triangleAPB` , we have `cos THETA=(AP^2 +BP^2 -AB^2)/(2 AP.BP)` `rArr cos theta=(5^2+5^2 -(3sqrt2)^2)/(2xx5xx5)[ "In" triangleAOB, AB^2=OA^2+OB^2]` `rArr cos theta=16/25` |
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| 37. |
Consider the integral I = int_(0)^(2pi) (dx)/( 5 - 2 cos x) . Making the substitution tan (x)/(2) = t we have int_(0)^(2pi) (dx)/(5 - 2 cos x) = int_(0)^(0) (2 dt)/((1+ t^(2))(5 - 2 (1-t^(2))/(1+ t^(2))))=0 The result isobviouslywrong, since the integrand is positive, and , consequently, theintegral of this function cannot be equal to zero . Find the mistake. |
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| 38. |
Leta,b,c,d beanyfourrealnumbers, thena^n +b^n= c^n+d^nholdsfor anynaturalnumber n, if |
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Answer» `a+b=c+d` |
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| 39. |
Integrate the functions (sin^(-1)sqrtx-cos^(-1)sqrtx)/(sin^(-1)sqrtx+cos^(-1)sqrtx),xin[0,1] |
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| 40. |
If f(x) is a differentiable function wherever it is continuous and f'(c_(1))=f'(c_(2))=0, f''(c_(1)).f''(c_(2)) lt 0,f(c_(1))=5,f(c_(2))=0 and (c_(1) lt c_(2)) If f(x) is continuous in [c_(1), c_(2)] and f''(c_(1))-f''(c_(2)) gt0, then minimum number of roots of f(x)=0 in [c_(2)-1, c_(2)+1] is |
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Answer» 2 |
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| 41. |
If f(x) is a differentiable function wherever it is continuous and f'(c_(1))=f'(c_(2))=0, f''(c_(1)).f''(c_(2)) lt 0,f(c_(1))=5,f(c_(2))=0 and (c_(1) lt c_(2)) If f(x) is continuous in [c_(1),c_(2)] and f''(c_(1))-f''(c_(2)) lt 0, then minimum number of roots of f'(x)=0 in c_(1)-1, c_(2)+1] is |
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Answer» 1 |
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| 42. |
Which one of the following vectors is a magnitude 6 and perpendicular to both a=2hati+2hatj+hatk and b=hati-2hatj+2hatk? |
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Answer» `2hati-hatj-2hatk` `6hat(i)-3HAT(j)-6hat(k)` `|axxb|=sqrt(36+9+36)=sqrt(81)=9` `therefore` Requried VECTORS are `+-6|(axxb)/(|axxb||)|=+-(6)/(9)(6hat(i)-3hat(j)-6hat(k))=+-2(2hat(i)-hat(j)-2hat(k))` |
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| 43. |
Find dy/dx if x^y = c |
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Answer» Solution :`x^ y = C. IMPLIES y In x= In c implies d/dx CDOT(y In x) = d/dx (In c) implies dy/dx cdot In x + y d/dx (In x) = 0 implies dy/dx cdot In x + y/x = 0 implies dy/dx = -y/(x In x)` |
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| 45. |
If n is a product of k distinct primes what is the total number of factors of n ? |
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Answer» Solution :n is a PRODUCT of k distinct primes. `:.` In order to be a factor, of n, we have choose at least one of k distinct primes. `:.` The NUMBER of ways. `= ""^kC_1+ ""^kC_2 + ……….. ""^kC_(k-1) =2^k-1-1` `:. "The number of factors of n is "2^k-2`. (EXCLUDING 1 as 1 is not PRIME . It is also not include n.) |
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| 46. |
f: N rarr N , f(n) = (n+5)^(2) , n in N , then the function f is ............ |
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Answer» NEITHER ONE one nor ONTO |
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| 47. |
The set of value of x for which the inequality [x]^(2)-5[x]+6 le 0 (where [.] denote the greatest integral function) hold good if |
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Answer» `2 LE [X] LT 3` |
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| 49. |
intxsinxdx |
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Answer» SOLUTION :`intxsinxdx` [X=first FUNCTION sinx=2nd function] =`x.(-COSX)-intd/DX(x).(-cosx)dx` =`-xcosx+intcosxdx` =-xcosx+sinx+C |
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