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. |
Using properties of determinants, prove that ∣∣∣∣∣(x+y)2zxzyzx(z+y)2xyzyxy(z+x)2∣∣∣∣∣=2xyz(x+y+z)3 |
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Answer» Using properties of determinants, prove that ∣∣ ∣ ∣∣(x+y)2zxzyzx(z+y)2xyzyxy(z+x)2∣∣ ∣ ∣∣=2xyz(x+y+z)3 |
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| 2. |
Solve for x : −3x+5<101 |
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Answer» Solve for x : −3x+5<101 |
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| 3. |
If a and b are the position vectors of two points A and B and C is a point on AB produced such that AC = 3AB, then position vector of C will be |
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Answer» If a and b are the position vectors of two points A and B and C is a point on AB produced such that AC = 3AB, then position vector of C will be |
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| 4. |
A straight line L1:xa+yb=1 intersects the x-axis and y-axis at P and Q respectively and a straight line L2 perpendicular to L1 cuts the x-axis and y-axis at R and S respectively. The locus of the point of intersection of the lines PS and QR is |
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Answer» A straight line L1:xa+yb=1 intersects the x-axis and y-axis at P and Q respectively and a straight line L2 perpendicular to L1 cuts the x-axis and y-axis at R and S respectively. The locus of the point of intersection of the lines PS and QR is |
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| 5. |
Find the following integrals. ∫(2x−3cosx+ex)dx. |
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Answer» Find the following integrals. |
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| 6. |
If ∫1+cosxcosx−cos2xdx=log|secx+tanx|−2f′(x)+C, then the function f(x) is |
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Answer» If ∫1+cosxcosx−cos2xdx=log|secx+tanx|−2f′(x)+C, then the function f(x) is |
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| 7. |
A divisor of N= 253453 is selected at random. The probability that the selected number is divisible by 200 if it is known that it is divisible by 100 is A) 3/4 B) 1/2 C) 1/4 D) 4/5 |
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Answer» A divisor of N= 253453 is selected at random. The probability that the selected number is divisible by 200 if it is known that it is divisible by 100 is A) 3/4 B) 1/2 C) 1/4 D) 4/5 |
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| 8. |
Each student in a class of 40, studies at least one of the subjects English, Mathematics and Physics. 16 study English, 22 study Physics and 26 study Mathematics, 5 study English and Physics, 14 Mathematics and Physics and 2 study all the three subjects. The number of students who study English and Mathematics but not Physics is |
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Answer» Each student in a class of 40, studies at least one of the subjects English, Mathematics and Physics. 16 study English, 22 study Physics and 26 study Mathematics, 5 study English and Physics, 14 Mathematics and Physics and 2 study all the three subjects. The number of students who study English and Mathematics but not Physics is |
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| 9. |
Each coefficient in the equation ax2+bx+c=0 is determined by throwing an ordinary die. Find the probability that the equation will have equal roots. |
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Answer» Each coefficient in the equation ax2+bx+c=0 is determined by throwing an ordinary die. Find the probability that the equation will have equal roots. |
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| 10. |
If α,β and γ are the real roots of the equation x3+5x2+9x−6=0. Find the value of α2+β2+γ2.__ |
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Answer» If α,β and γ are the real roots of the equation x3+5x2+9x−6=0. Find the value of α2+β2+γ2. |
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| 11. |
How to prove them symmetric and transitive ? |
| Answer» How to prove them symmetric and transitive ? | |
| 12. |
Integrate the following functions. ∫5x−21+2x+3x2dx. |
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Answer» Integrate the following functions. |
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| 13. |
Value of (1 +cosπ/8)(1 +cos3π/8)(1 +cos5π/8)(1 +cos7π/8) |
| Answer» Value of (1 +cosπ/8)(1 +cos3π/8)(1 +cos5π/8)(1 +cos7π/8) | |
| 14. |
Calculate the mean deviation about the median for the following data. Marks0−1010−2020−3030−4040−5050−6060−7070−80No. of students1816151210522 |
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Answer» Calculate the mean deviation about the median for the following data. Marks0−1010−2020−3030−4040−5050−6060−7070−80No. of students1816151210522 |
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| 15. |
It is known that 10% of certain articles manufactured are defective, what is the probability that in a random sample of 12 such articles, 9 are defective? |
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Answer» It is known that 10% of certain articles manufactured are defective, what is the probability that in a random sample of 12 such articles, 9 are defective? |
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| 16. |
a+ar+ar2+⋯+arn−1=a(rn−1)r−1 |
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Answer» a+ar+ar2+⋯+arn−1=a(rn−1)r−1 |
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| 17. |
The range of k for which |x2−1|=k has exactly two solutions is |
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Answer» The range of k for which |x2−1|=k has exactly two solutions is |
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| 18. |
If 6n−5n, n∈N is divided by 25, then the remainder is |
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Answer» If 6n−5n, n∈N is divided by 25, then the remainder is |
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| 19. |
In a class of 42 students, 23 are studying Mathematics, 24 are studying Physics, 19 are studying Chemistry. If 12 are studying both Mathematics and Physics, 9 are studying both Mathematics and Chemistry, 7 are studying both Physics and Chemistry and 4 are studying all the three subjects, then the number of students studying exactly one subject, is |
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Answer» In a class of 42 students, 23 are studying Mathematics, 24 are studying Physics, 19 are studying Chemistry. If 12 are studying both Mathematics and Physics, 9 are studying both Mathematics and Chemistry, 7 are studying both Physics and Chemistry and 4 are studying all the three subjects, then the number of students studying exactly one subject, is |
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| 20. |
In a class with 35 women and 25 men, 25% of the women are business majors. Find the probability that a student chosen from the class at random is a female business major. |
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Answer» In a class with 35 women and 25 men, 25% of the women are business majors. Find the probability that a student chosen from the class at random is a female business major. |
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| 21. |
limx→0sinax+bxax+sinbx |
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Answer» limx→0sinax+bxax+sinbx |
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| 22. |
If x2+px + q = 0 is the quadratic equation whose roots are a – 2 and b – 2 where a and b are the roots of x2 - 3x + 1 =0, then |
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Answer» If x2+px + q = 0 is the quadratic equation whose roots are a – 2 and b – 2 where a and b are the roots of x2 - 3x + 1 =0, then |
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| 23. |
The two adjacent sides of a parallelogram are 2^i−4^j+5^k and ^i−2^j−3^k. Find the unit vector parallel to its diagonal. Also, find its area. |
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Answer» The two adjacent sides of a parallelogram are 2^i−4^j+5^k and ^i−2^j−3^k. Find the unit vector parallel to its diagonal. Also, find its area. |
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| 24. |
A box contains 25 tickets numbered 1, 2, ....... 25. If two tickets are drawn atrandom then the probability that the product of their numbers is even, is |
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Answer» A box contains 25 tickets numbered 1, 2, ....... 25. If two tickets are drawn at random then the probability that the product of their numbers is even, is |
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| 25. |
From a well shuffled deck of 52 cards, 4 cards are drawn at random. What is the probability that all the drawn cards are of the same colour. |
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Answer» From a well shuffled deck of 52 cards, 4 cards are drawn at random. What is the probability that all the drawn cards are of the same colour. |
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| 26. |
A particle P starts from the point z0=1+2i , where i=√−1 It moves first horizontally away from origin by 5 units and then vertically away from origin by 3 units to reach a point z1. From z1 the particle moves √2 units away from origin in the direction of x=y and then it moves through an angle π/2 in anticlockwise direction on a circle with centre at origin to reach a point z2. Then point z2 is given by |
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Answer» A particle P starts from the point z0=1+2i , where i=√−1 It moves first horizontally away from origin by 5 units and then vertically away from origin by 3 units to reach a point z1. From z1 the particle moves √2 units away from origin in the direction of x=y and then it moves through an angle π/2 in anticlockwise direction on a circle with centre at origin to reach a point z2. Then point z2 is given by |
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| 27. |
(a) A factory manufactures two types of screws, A and B. Each type of screw requires the use of two machines, an automatic and a hand operated. It takes 4 minutes on the automatic and 6 minutes on hand operated machines to manufacturer a package of screw A, while it takes 6 minutes on automatic and 3 minutes on the hand operatedmachines to manufacture a package of screw B. Each machine is available for at the most 4 hours (240minutes) on any day. The manufacturer can sell a package of screws A at a profit of Rs 7 and screws B at a profit of Rs.10. Assuming that he can sell all the screws he manufactures, how many packages of each type should the factory owner produce in a day in order to maximize his profit? Determine the maximum profit. (b)Prove that∣∣∣∣1+a1111+b1111+c∣∣∣∣=abc(1+1a+1b+1c)=abc+bc+ca+ab |
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Answer» (a) A factory manufactures two types of screws, A and B. Each type of screw requires the use of two machines, an automatic and a hand operated. It takes 4 minutes on the automatic and 6 minutes on hand operated machines to manufacturer a package of screw A, while it takes 6 minutes on automatic and 3 minutes on the hand operatedmachines to manufacture a package of screw B. Each machine is available for at the most 4 hours (240minutes) on any day. The manufacturer can sell a package of screws A at a profit of Rs 7 and screws B at a profit of Rs.10. Assuming that he can sell all the screws he manufactures, how many packages of each type should the factory owner produce in a day in order to maximize his profit? Determine the maximum profit. (b)Prove that∣∣ |
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| 28. |
The domain of the function f(x)=11−{x} is (where {.} denotes the fractional part of x) |
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Answer» The domain of the function f(x)=11−{x} is |
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| 29. |
The first term of an A.P. is 2 and the last term is 50. The sum of all these terms is 442. Find the common difference. |
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Answer» The first term of an A.P. is 2 and the last term is 50. The sum of all these terms is 442. Find the common difference. |
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| 30. |
The value of ∫2−1|x|x dx is |
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Answer» The value of ∫2−1|x|x dx is |
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| 31. |
4x+32x−3<6 |
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Answer» 4x+32x−3<6 |
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| 32. |
If x=tan−117 and y=tan−113, then |
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Answer» If x=tan−117 and y=tan−113, then |
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| 33. |
If A lies in second quadrant and 3 and A=4=0, then the value of 2 cot A -5 cos A =sin A is equal to |
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Answer» If A lies in second quadrant and 3 and A=4=0, then the value of 2 cot A -5 cos A =sin A is equal to |
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| 34. |
Plane ax+by+cz=1 intersects axes in A,B,C respectively. If G(16,−13,1) is a centroid of ΔABC, then a+b+3c=_____ |
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Answer» Plane ax+by+cz=1 intersects axes in A,B,C respectively. If G(16,−13,1) is a centroid of ΔABC, then a+b+3c=_____ |
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| 35. |
If L || M and M || N, then what can be said about L and N? |
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Answer» If L || M and M || N, then what can be said about L and N? |
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| 36. |
If the distance between the points (5,−2) and (1,a) is 5 units, then the sum of all possible values(s) of a is |
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Answer» If the distance between the points (5,−2) and (1,a) is 5 units, then the sum of all possible values(s) of a is |
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| 37. |
The maximum slope of the curve y=12x4−5x3+18x2−19x occurs at the point : |
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Answer» The maximum slope of the curve y=12x4−5x3+18x2−19x occurs at the point : |
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| 38. |
Let A(θ) and B(ϕ) are the parametric ends of a chord of the hyperbola x2144−y225=1. If the equation of AB is 2x+3y=1, then |
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Answer» Let A(θ) and B(ϕ) are the parametric ends of a chord of the hyperbola x2144−y225=1. If the equation of AB is 2x+3y=1, then |
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| 39. |
Minimum of y if y=|x|−|x+1|+|x+2|−…+|x+2016| is |
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Answer» Minimum of y if y=|x|−|x+1|+|x+2|−…+|x+2016| is |
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| 40. |
The complete solution set of sinx−√3cosx=0 is |
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Answer» The complete solution set of sinx−√3cosx=0 is |
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| 41. |
Find the particular solution of the differential equation (x−y)dydx=(x+2y), given that y=0 when x=1. |
| Answer» Find the particular solution of the differential equation (x−y)dydx=(x+2y), given that y=0 when x=1. | |
| 42. |
If log10a12=log10b21=log10c15, then bc is equal to |
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Answer» If log10a12=log10b21=log10c15, then bc is equal to |
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| 43. |
A card is drawn at random from a well-shuffled deck of 52 cards. Find the probability of its being a spade or a king. |
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Answer» A card is drawn at random from a well-shuffled deck of 52 cards. Find the probability of its being a spade or a king. |
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| 44. |
If x1+x2+x3+x4+x5=6, then the difference between the number of non negative integral solutions and the number of positive integral solutions will be |
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Answer» If x1+x2+x3+x4+x5=6, then the difference between the number of non negative integral solutions and the number of positive integral solutions will be |
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| 45. |
Prove that 9π8−94sin−1(13)=94sin−1(2√23) |
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Answer» Prove that 9π8−94sin−1(13)=94sin−1(2√23) |
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| 46. |
For the question verify that the given function (explicit or implicit) is a solution of the corresponding differential equation. y=ex+1 and y''-y'=0. |
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Answer» For the question verify that the given function (explicit or implicit) is a solution of the corresponding differential equation. |
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| 47. |
If α+β−γ=π then sin2α+sin2β−sin2γ is equal to |
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Answer» If α+β−γ=π then sin2α+sin2β−sin2γ is equal to |
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| 48. |
The equation of the circle concentric with x2−3x+4y−c=0 and passing through (-1, -2) is |
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Answer» The equation of the circle concentric with x2−3x+4y−c=0 and passing through (-1, -2) is |
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| 49. |
Prove that ∣∣∣∣111abca3b3c3∣∣∣∣=(a−b)(b−c)(c−a)(a+b+c) |
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Answer» Prove that |
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| 50. |
The first and last term of an AP are 1 and 11 if the sum of its terms is 36 then a = ______,d=_____,n=_____&a5=_________ |
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Answer» The first and last term of an AP are 1 and 11 if the sum of its terms is 36 then a = ______,d=_____,n=_____&a5=_________ |
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