Subject

Mathematics

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

21.

The integral integral subscript 2 superscript 4 fraction numerator log space straight x squared over denominator log space straight x squared space plus space log space left parenthesis 36 minus 12 space straight x plus straight x squared right parenthesis end fraction dx  is equal to 

  • 2

  • 4

  • 1

  • 1

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22.

The area (in sq units) of the region described by {x,y): y2 ≤ 2x and y ≥ 4x-1} is

  • 7/32

  • 5/64

  • 15/64

  • 15/64


D.

15/64

Given region is {x,y): y2 ≤ 2x and y ≥ 4x-1} y2 ≤ 2x  represents a region inside the parabola,
 y2 = 2x   .. (i)
and y ≥ 4x-1 represents a region to the left of the line
 y = 4x-1 .... (ii)
The point of intersection of the curve (i) and (ii) is 
(4x-1)2  = 2x
⇒ 16x2 + 1-8x = 2x
16x2-10x+1 = 0
 x = 1/2, 1/8
therefore, the points where these curves intersects, are 
open parentheses 1 half comma 1 close parentheses space space and space open parentheses 1 over 8 comma negative 1 half close parentheses

Hence, required area,
integral subscript negative 1 divided by 2 end subscript superscript 1 open parentheses fraction numerator straight y plus 1 over denominator 4 end fraction minus straight y squared over 2 close parentheses space dy
space equals space 1 fourth open parentheses straight y squared over 2 plus straight y close parentheses subscript negative 1 divided by 2 end subscript superscript 1 space minus space 1 over 6 left parenthesis straight y cubed right parenthesis to the power of 1 subscript negative 1 divided by 2 end subscript
equals space 1 fourth open curly brackets open parentheses 1 half plus 1 close parentheses minus open parentheses 1 over 8 minus 1 half close parentheses close curly brackets minus 1 over 6 open curly brackets 1 plus 1 over 8 close curly brackets
space equals space 1 fourth space open curly brackets 3 over 2 space plus 3 over 8 close curly brackets minus 1 over 6 open curly brackets 9 over 8 close curly brackets
space equals space 1 fourth space straight x space 15 over 8 space minus space 3 over 16 space equals space 9 over 32

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23.

Let y(x) be the solution of the differential equation left parenthesis straight x space log space straight x right parenthesis dy over dx space plus straight y space equals space 2 space straight x space log space straight x comma (x  ≥1). Then, y (e) is equal to 

  • e

  • 0

  • 2

  • 2

182 Views

24.

The number of points having both coordinates as integers that lie in the interior of the triangle with vertices (0,0), (0,41) and (41,0) is

  • 901

  • 861

  • 820

  • 820

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25.

Locus the image of the point (2,3) in the line (2x - 3y +4) + k (x-2y+3) = 0, k ε R is a 

  • straight line parallel to X - axis

  • a straight line parallel to Y- axis

  • circle of radius square root of 2

  • circle of radius square root of 2

654 Views

26.

The area (in sq units) of the quadrilateral formed by the tangents at the end points of the latera recta to the ellipsestraight x squared over 9 plus straight y squared over 5 space equals space 1 space is space

  • 27/4

  • 18

  • 27/2

  • 27/2

998 Views

27.

Let O be the vertex and Q be nay point on the parabola x2 = 8y. If the point P divides the line segment OQ internally in the ratio 1:3 then the locus of P is 

  • x2= y

  • y2 =x

  • y2 =2x

  • y2 =2x

349 Views

28.

The distance of the point (1,0,2) from the point of intersection of the line fraction numerator straight x minus 2 over denominator 3 end fraction space equals space fraction numerator straight y plus 1 over denominator 4 end fraction space equals space fraction numerator straight z minus 2 over denominator 12 end fraction and the plane x-y +z = 16 is

  • 2 square root of 14
  • 8

  • 3 square root of 21
  • 3 square root of 21
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29.

The equation of the plane containing the line 2x-5y +z = 3, x +y+4z = 5 and parallel to the plane x +3y +6z =1 is

  • 2x + 6y + 12z = 13

  • x+3y+6z = -7

  • x+3y +6z = 7

  • x+3y +6z = 7

455 Views

30.

Let, a, b and c be three non-zero vectors such that no two of them are collinear and left parenthesis straight a space xb right parenthesis space straight x space straight c space equals space 1 third vertical line straight b vertical line vertical line straight c vertical line straight a. if θ is the angle between vectors b and  c, then a value of sin θ is

  • fraction numerator 2 square root of 2 over denominator 3 end fraction
  • fraction numerator negative square root of 2 over denominator 3 end fraction
  • 2 over 3
  • 2 over 3
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