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.

Integrating factor of differential equation cosxdydx+ysinx=1 is

Answer»

Integrating factor of differential equation cosxdydx+ysinx=1 is

2.

Find the eccentricity of a hyperbola whose latus rectum is half of its transverse axis.

Answer»

Find the eccentricity of a hyperbola whose latus rectum is half of its transverse axis.

3.

The order and degree of the differential equation y−xdydxdydx=(dydx)2 are ____ and _____ respectively.

Answer» The order and degree of the differential equation
yxdydxdydx=(dydx)2 are ____ and _____ respectively.
4.

The set of values of m for which f(x)=x2−(m−3)x+m intersects the positive direction of x−axis atleast once, is

Answer»

The set of values of m for which f(x)=x2(m3)x+m intersects the positive direction of xaxis atleast once, is

5.

The Boolean expression (p∧q)⇒((r∧q)∧p) is equivalent to

Answer»

The Boolean expression (pq)((rq)p) is equivalent to

6.

The value of cos12∘cos24∘cos36∘cos48∘cos60∘cos72∘cos84∘ is

Answer»

The value of cos12cos24cos36cos48cos60cos72cos84 is

7.

dy+2y = sin xdx

Answer» dy+2y = sin xdx
8.

Question 25Observe the chart and graph given in Fig. 10.3 carefully and answer the following questions.(a) Which of the line represents the height of boys?(b) Which line represents the height of girls?(c) What is the difference between the pattern of increase in the height of boys and girls?(d) Is this pattern true for each individual?

Answer» Question 25

Observe the chart and graph given in Fig. 10.3 carefully and answer the following questions.









(a) Which of the line represents the height of boys?

(b) Which line represents the height of girls?

(c) What is the difference between the pattern of increase in the height of boys and girls?

(d) Is this pattern true for each individual?
9.

For any two sets A and B, prove that(i) B ⊂ A ∪ B (ii) A ∩ B ⊂ A (iii) A ⊂ B ⇒ A ∩ B = A

Answer» For any two sets A and B, prove that



(i) B ⊂ A ∪ B (ii) A ∩ B ⊂ A (iii) A ⊂ B ⇒ A ∩ B = A
10.

In the given figure, ∠AOC and ∠BOC form a linear pair. If a − 2b = 30°, find a and b.

Answer» In the given figure, ∠AOC and ∠BOC form a linear pair. If a − 2b = 30°, find a and b.



11.

(a) If A = {1, 3, 4, 8, 9, 12}, B = {1, 4, 9} and C = {2, 4, 8, 10}Find (i) A ∪ (B ∩ C) (ii) A ∩ (B ∪ C) (iii) (A ∪ B) ∩ (A ∪ C) (iv) (A ∩ B) ∪ (A ∩ C) (b) If A = (2, 4, 6, 8, 10}, B = {1, 2, 3, 4, 5, 6} and C = (1, 3, 5, 7, 9, 11, 13}Verify (i) A ∪ (B ∩ C) = (A ∪ B) ∩ (A ∪ C) (ii) A ∩ (B ∪ C) = (A ∩ B) ∪ (A ∩ C)(iii) (A ∩ B) ∪ C = (A ∪ C) ∩ (B ∪ C) (iv) (A ∪ B) ∩ C = (A ∩ C) ∪ (B ∩ C) (c) If X = {x : x is a prime number less than 12}Y = {x : x is an even number less than 12}Z = {x : x is an odd number less than 12}Show that (i) union of sets of distributive over intersection of sets.(ii) intersection of sets is distributive over union of sets.

Answer»

(a) If A = {1, 3, 4, 8, 9, 12}, B = {1, 4, 9} and C = {2, 4, 8, 10}



Find (i) A (B C) (ii) A (B C) (iii) (A B) (A C) (iv) (A B) (A C)





(b) If A = (2, 4, 6, 8, 10}, B = {1, 2, 3, 4, 5, 6} and C = (1, 3, 5, 7, 9, 11, 13}



Verify (i) A (B C) = (A B) (A C) (ii) A (B C) = (A B) (A C)



(iii) (A B) C = (A C) (B C) (iv) (A B) C = (A C) (B C)





(c) If X = {x : x is a prime number less than 12}



Y = {x : x is an even number less than 12}



Z = {x : x is an odd number less than 12}



Show that (i) union of sets of distributive over intersection of sets.



(ii) intersection of sets is distributive over union of sets.

12.

let a= aij is 3 x 3 scalar matrix such that a11+ a22+ a33 = 15. Then write matrix A

Answer» let a= aij is 3 x 3 scalar matrix such that a11+ a22+ a33 = 15. Then write matrix A
13.

Find the multiplicative inverse of the complex number 4 – 3i

Answer»

Find the multiplicative inverse of the complex number 4 – 3i

14.

∫[f(x)g′(x)+g(x)f′(x)]f(x).g(x)[log f(x)+log g(x)] dx is equal to

Answer» [f(x)g(x)+g(x)f(x)]f(x).g(x)[log f(x)+log g(x)] dx is equal to
15.

Equation of a circle which passes through (3, 6) and touches the axes is(a) x2 + y2 + 6x + 6y + 3 = 0(b) x2 + y2 – 6x – 6y – 9 = 0(c) x2 + y2 – 6x – 6y + 9 = 0(d) None of these

Answer» Equation of a circle which passes through (3, 6) and touches the axes is

(a) x2 + y2 + 6x + 6y + 3 = 0

(b) x2 + y2 – 6x – 6y – 9 = 0

(c) x2 + y2 – 6x – 6y + 9 = 0

(d) None of these
16.

If p be the length of the perpendicular from the origin on the line xa+yb=1, then

Answer»

If p be the length of the perpendicular from the origin on the line xa+yb=1, then


17.

The period of the function f(x)=3tan(x3+π2)=

Answer»

The period of the function f(x)=3tan(x3+π2)=

18.

If ∫eax cos (bx) dx=eaxK (a cosbx+b sinbx)+C, then the K here would be equal to -

Answer»

If eax cos (bx) dx=eaxK (a cosbx+b sinbx)+C, then the K here would be equal to -

19.

If f(x)=√1−√1−x2, then the value of 2√2f′(0+) is

Answer» If f(x)=11x2, then the value of 22f(0+) is


20.

The locus of the point of intersection of the lines √3kx+ky−4√3=0 and √3x−y−4√3k=0 is a conic, whose length of latus rectum is equal to

Answer» The locus of the point of intersection of the lines 3kx+ky43=0 and 3xy43k=0 is a conic, whose length of latus rectum is equal to
21.

9.tan-1-, lxla2 -x2

Answer» 9.tan-1-, lxla2 -x2
22.

Quantization in details

Answer» Quantization in details
23.

The coefficient of t4 in the expansion of (1−t61−t)3 is :

Answer»

The coefficient of t4 in the expansion of (1t61t)3 is :

24.

The area enclosed by the curve y=sinx+cosx and y=|cosx−sinx| over the interval [0,π2] is

Answer»

The area enclosed by the curve y=sinx+cosx and y=|cosxsinx| over the interval [0,π2] is

25.

Let A={a,b,c} and B={1,2,3,4}. Then the number of elements in the set C={f:A→B | 2∈f(A) and f is not one–one} is

Answer» Let A={a,b,c} and B={1,2,3,4}. Then the number of elements in the set C={f:AB | 2f(A) and f is not one–one} is
26.

A balloon, which always remains spherical, has a variable diameter 32(2x+1).Find the rate of change of its volume with respect to x.

Answer» A balloon, which always remains spherical, has a variable diameter

32(2x+1).

Find the rate of change of its volume with respect to x.


27.

If the line y=mx+c is tangent to the circle x2+y2=5r2 and the parabola y2−4x−2y+4λ+1=0 and point of contact of the tangent with the parabola is (8,5), then the value of (25r2+λ+2m+c) is

Answer» If the line y=mx+c is tangent to the circle x2+y2=5r2 and the parabola y24x2y+4λ+1=0 and point of contact of the tangent with the parabola is (8,5), then the value of (25r2+λ+2m+c) is
28.

∑∞n=1tan(2n−14)π2n+1=

Answer»

n=1tan(2n14)π2n+1=


29.

Prove that the curves y2=4x and x2=4y divide the area of the square bounded by the sides x=0,x=4,y=4 and y=0 into three equal parts.

Answer» Prove that the curves y2=4x and x2=4y divide the area of the square bounded by the sides x=0,x=4,y=4 and y=0 into three equal parts.
30.

22. Tangents are drawn from the point P(3,4) to the ellipse x(sqr)/9 + y(sqr)/4 = 1 touching the ellipse at points A and B. Find the equation of the locus of the point whose distances from the point P and the line AB are equal.

Answer» 22. Tangents are drawn from the point P(3,4) to the ellipse x(sqr)/9 + y(sqr)/4 = 1 touching the ellipse at points A and B. Find the equation of the locus of the point whose distances from the point P and the line AB are equal.
31.

Sin(A + B) = SinACosB + CosASinB

Answer» Sin(A + B) = SinACosB + CosASinB
32.

If (tan θ + 2) (2tan θ + 1) = A tan θ + B sec2θ, then AB = _________.

Answer» If (tan θ + 2) (2tan θ + 1) = A tan θ + B sec2θ, then AB = _________.
33.

Tap on the array which gives 20 as the answer.

Answer»

Tap on the array which gives 20 as the answer.

34.

If three points (h,0),(a,b) and (0,k) lie on a line, show that ah+bk=1

Answer» If three points (h,0),(a,b) and (0,k) lie on a line, show that ah+bk=1
35.

Solve the given inequality for real x:

Answer»

Solve the given inequality for real x:

36.

The minimized expression for the given boolean function F isF(w,x,y,z)=Π(0,1,4,5,8,9,11)+∑d(2,10)

Answer»

The minimized expression for the given boolean function F is

F(w,x,y,z)=Π(0,1,4,5,8,9,11)+d(2,10)



37.

The equation of sphere passing through points (1,0,0),(0,1,0) and (0,0,1) and having minimum radius, is

Answer»

The equation of sphere passing through points (1,0,0),(0,1,0) and (0,0,1) and having minimum radius, is

38.

If the ratio of the roots of the equation x2−px+q=0, is a:b, then the value of p2ab=

Answer»

If the ratio of the roots of the equation x2px+q=0, is a:b, then the value of p2ab=

39.

If (p+q)th term and (p−q)th term of a G.P. be m and n, then the pth term will be ___.

Answer»

If (p+q)th term and (pq)th term of a G.P. be m and n, then the pth term will be ___.



40.

If f(x)=2x2 and g(x)=13x, then fog is ___

Answer» If f(x)=2x2 and g(x)=13x, then fog is ___
41.

The sum of real roots of the equation ∣∣∣∣x−6−12−3xx−3−32xx+2∣∣∣∣=0, is equal to :

Answer»

The sum of real roots of the equation
x6123xx332xx+2
=0,
is equal to :

42.

A hyperbola having the transverse axis of length 2sinθ unit, is confocal with the ellipse 3x2+4y2=12, then its equation is

Answer»

A hyperbola having the transverse axis of length 2sinθ unit, is confocal with the ellipse 3x2+4y2=12, then its equation is

43.

if 2 raise to the power x 1 + X 2 is equal to 6 raise to the power x 2 and 3 raise to the power x 1 minus 1 is equal to 2 raise to the power x + 1 find the value of log 3 - log 2 upon X 1 - x 2

Answer» if 2 raise to the power x 1 + X 2 is equal to 6 raise to the power x 2 and 3 raise to the power x 1 minus 1 is equal to 2 raise to the power x + 1 find the value of log 3 - log 2 upon X 1 - x 2
44.

-4+8+16 cosec4θ+sin4θ=A cosec θ+B sin θ, then A = _______ and B = _________.

Answer» -4+8+16 cosec4θ+sin4θ=A cosec θ+B sin θ, then A = _______ and B = _________.
45.

If vector (a^ + 2b^ ) is perpendicular

Answer» If vector (a^ + 2b^ ) is perpendicular
46.

If one root of 4x2−2x+(λ−4)=0 is reciprocal of the other, then value of λ is8

Answer» If one root of 4x22x+(λ4)=0 is reciprocal of the other, then value of λ is
  1. 8
47.

Cofunction of cot20 is

Answer»

Cofunction of cot20 is


48.

Plots of log(xm) vs log C showing a straight line parallel to X-axis reveals that:

Answer»

Plots of log(xm) vs log C showing a straight line parallel to X-axis reveals that:



49.

How many numbers lying between 10 and 1000 can be formed from the digits 1, 2, 3, 4, 5, 6, 7, 8, 9 (repetition is allowed)

Answer»

How many numbers lying between 10 and 1000 can be formed from the digits 1, 2, 3, 4, 5, 6, 7, 8, 9 (repetition is allowed)



50.

In ΔABC, b−cr1+c−ar2+a−br3=

Answer»

In ΔABC, bcr1+car2+abr3=