JEE MAIN - Mathematics (2014 (Offline))

• 1

  The variance of first 50 even natural numbers is

  回答

  (A)

  833
• 2

  $$\mathop {\lim }\limits_{x \to 0} {{\sin \left( {\pi {{\cos }^2}x} \right)} \over {{x^2}}}$$ is equal to :

  回答

  (B)

  $$ \pi $$
• 3

  Let the population of rabbits surviving at time $$t$$ be governed by the differential equation $${{dp\left( t \right)} \over {dt}} = {1 \over 2}p\left( t \right) - 200.$$ If $$p(0)=100,$$ then $$p(t)$$ equals:

  回答

  (C)

  $$400 - 300\,{e^{t/2}}$$
• 4

  The integral $$\int\limits_0^\pi {\sqrt {1 + 4{{\sin }^2}{x \over 2} - 4\sin {x \over 2}{\mkern 1mu} } } dx$$ equals:

  回答

  (B)

  $$4\sqrt 3 - 4 - {\pi \over 3}$$
• 5

  The area of the region described by
  $$A = \left\{ {\left( {x,y} \right):{x^2} + {y^2} \le 1} \right.$$ and $$\left. {{y^2} \le 1 - x} \right\}$$ is :

  回答

  (C)

  $${\pi \over 2} + {4 \over 3}$$
• 6

  The integral $$\int {\left( {1 + x - {1 \over x}} \right){e^{x + {1 \over x}}}dx} $$ is equal to

  回答

  (D)

  
• 7

  If $$A$$ is a $$3 \times 3$$ non-singular matrix such that $$AA'=A'A$$ and
  $$B = {A^{ - 1}}A',$$ then $$BB'$$ equals:

  回答

  (D)

  $$I$$
• 8

  If $$\alpha ,\beta \ne 0,$$ and $$f\left( n \right) = {\alpha ^n} + {\beta ^n}$$ and $$$\left| {\matrix{ 3 & {1 + f\left( 1 \right)} & {1 + f\left( 2 \right)} \cr {1 + f\left( 1 \right)} & {1 + f\left( 2 \right)} & {1 + f\left( 3 \right)} \cr {1 + f\left( 2 \right)} & {1 + f\left( 3 \right)} & {1 + f\left( 4 \right)} \cr } } \right|$$$
  $$ = K{\left( {1 - \alpha } \right)^2}{\left( {1 - \beta } \right)^2}{\left( {\alpha - \beta } \right)^2},$$ then $$K$$ is equal to :

  回答

  (A)

  $$1$$
• 9

  If $$x=-1$$ and $$x=2$$ are extreme points of $$f\left( x \right) = \alpha \,\log \left| x \right|+\beta {x^2} + x$$ then

  回答

  (A)

  $$\alpha = 2,\beta = - {1 \over 2}$$
• 10

  If $$g$$ is the inverse of a function $$f$$ and $$f'\left( x \right) = {1 \over {1 + {x^5}}},$$ then $$g'\left( x \right)$$ is equal to:

  回答

  (B)

  $$1 + {\left\{ {g\left( x \right)} \right\}^5}$$
• 11

  Let $$A$$ and $$B$$ be two events such that $$P\left( {\overline {A \cup B} } \right) = {1 \over 6},\,P\left( { {A \cap B} } \right) = {1 \over 4}$$ and $$P\left( {\overline A } \right) = {1 \over 4},$$ where $$\overline A $$ stands for the complement of the event $$A$$. Then the events $$A$$ and $$B$$ are :

  回答

  (A)

  independent but not equally likely.
• 12

  The locus of the foot of perpendicular drawn from the centre of the ellipse $${x^2} + 3{y^2} = 6$$ on any tangent to it is :

  回答

  (A)

  $$\left( {{x^2} + {y^2}} \right) ^2 = 6{x^2} + 2{y^2}$$
• 13

  Let $$a, b, c$$ and $$d$$ be non-zero numbers. If the point of intersection of the lines $$4ax + 2ay + c = 0$$ and $$5bx + 2by + d = 0$$ lies in the fourth quadrant and is equidistant from the two axes then :

  回答

  (A)

  $$3bc - 2ad = 0$$
• 14

  Let $$PS$$ be the median of the triangle with vertices $$P(2, 2)$$, $$Q(6, -1)$$ and $$R(7, 3)$$. The equation of the line passing through $$(1, -1)$$ band parallel to PS is :

  回答

  (D)

  $$2x + 9y + 7 = 0$$
• 15

  Three positive numbers form an increasing G.P. If the middle term in this G.P. is doubled, the new numbers are in A.P. then the common ratio of the G.P. is :

  回答

  (B)

  $$2 + \sqrt 3 $$
• 16

  Let $$\alpha $$ and $$\beta $$ be the roots of equation $$p{x^2} + qx + r = 0,$$ $$p \ne 0.$$ If $$p,\,q,\,r$$ in A.P. and $${1 \over \alpha } + {1 \over \beta } = 4,$$ then the value of $$\left| {\alpha - \beta } \right|$$ is :

  回答

  (B)

  $${{2\sqrt 13 } \over 9}$$
• 17

  If $$a \in R$$ and the equation $$ - 3{\left( {x - \left[ x \right]} \right)^2} + 2\left( {x - \left[ x \right]} \right) + {a^2} = 0$$ (where [$$x$$] denotes the greater integer $$ \le x$$) has no integral solution, then all possible values of a lie in the interval :

  回答

  (C)

  $$\left( { - 1,0} \right) \cup \left( {0,1} \right)$$
• 18

  If z is a complex number such that $$\,\left| z \right| \ge 2\,$$, then the minimum value of $$\,\,\left| {z + {1 \over 2}} \right|$$ :

  回答

  (B)

  is strictly greater that $${{3 \over 2}}$$ but less than $${{5 \over 2}}$$
• 19

  Let $$f_k\left( x \right) = {1 \over k}\left( {{{\sin }^k}x + {{\cos }^k}x} \right)$$ where $$x \in R$$ and $$k \ge \,1.$$
  Then $${f_4}\left( x \right) - {f_6}\left( x \right)\,\,$$ equals :

  回答

  (B)

  $${1 \over 12}$$
• 20

  The angle between the lines whose direction cosines satisfy the equations $$l+m+n=0$$ and $${l^2} = {m^2} + {n^2}$$ is :

  回答

  (C)

  $${\pi \over 3}$$