Email
Chat with tutors
Login
Ask Questions, Get Answers
Menu
X
home
ask
tuition
questions
practice
papers
mobile
tutors
pricing
X
Answers posted by pady_1
Questions
4370
answers
1
best answer
0
votes
If the length of the tangent from $(h,k)$ to the circle $x^2+y^2=16$ is twice the length of the tangent from the same point to the circle $x^2+y^2+2x+2y=0,$ then
answered
Nov 7, 2013
$ (c)\;3h^2+3k^2+8h+8k+16=0$
0
votes
$(a,0)$ and $(b,0)$ are center of two circles belonging to a co-axial system of which y-axis is the radical axis. If radius of one of the circles is 'r', then the radius of the other circle is
answered
Nov 7, 2013
$(b)\;(r^2+b^2-a^2)^{1/2}$
0
votes
For the given circle $C$ with the equation $x^2+y^2-16x -12y +64=0$ match the list -I with the list II given below:
answered
Nov 7, 2013
(b)
0
votes
The circle $4x^2+4y^2-12 x-12y+9=0$
answered
Nov 7, 2013
(a) touches both the axes
0
votes
If the equation $ax^2+2hxy+by^2+2gx+2fy+c=0$ represents a pair of straight lines, then the square of the distance of their point of intersection from the origin is
answered
Nov 7, 2013
$(c)\;\frac{c(a+b)-f^2-g^2}{ab-h^2}$
0
votes
The equation of the pair of lines passing through the origin whose sum and product of slopes are respectively the arithmetic mean geometric mean of 4 and 9 is
answered
Nov 7, 2013
$(a)\;12x^2-13xy+2y^2=0$
0
votes
The equation $x^2-5xy+py^2+3x-8y+2=0$ represents a pair of straight lines. If $\theta$ is the angle between them, then $\sin \theta=$
answered
Nov 7, 2013
$(a)\;\frac{1}{\sqrt {50}}$
0
votes
If $2x+3y=5$ is the perpendicular bisector of the segment joining the points $A\bigg[1,\large\frac{1}{3}\bigg]$ and $B$ then $B=$
answered
Nov 7, 2013
$(a)\;\bigg[\frac{21}{13},\frac{49}{39}\bigg]$
0
votes
If the points $(1,2)$ and $(3,4) $ lie on the same side of the straight line $ 3x-5y+a=0$ then a lies in the set
answered
Nov 7, 2013
(b) R- [7,11]
0
votes
If $p$ and $q$ are the perpendicular distance from the origin to the straight lines $x\; \sec \theta-y \;cosec \theta=a$ and $x \cos \theta+ y \sin \theta= a \cos 2 \theta,$ then
answered
Nov 7, 2013
$(a)\;4p^2+q^2=a^2$
0
votes
The origin is translated to (1,2). The point $(7,5)$ in the old system undergoes the following transformations successively. (i) Moves to the new point under the given translation of origin. (ii) Translated through 2 units along the negative direction of the new X-axis. (iii) Rotated through an angle $\large\frac{\pi}{4}$ about the origin of new system in the clockwise direction. The final position of the point (7,5) is
answered
Nov 7, 2013
$(c)\;\bigg[\frac{7}{\sqrt 2},\frac{-1}{\sqrt 2}\bigg] $
0
votes
If $X$ is a Poisson variate and $P(X=1)=2P(X=2)$ then $P(X=3)=$
answered
Nov 7, 2013
$(a)\;\frac{e^{-1}}{6}$
0
votes
Two fair dice are rolled. The probability of the sum of digits on their faces to be greater that or equal to 10 is
answered
Nov 7, 2013
$(d)\;\frac{1}{6} $
0
votes
A bag contains $2n+1$ coins. It is known that $n$ of these coins have a head on both sides. Whereas the remaining $n+1$ coins are fair. A coins is picked up at random from the bag and tossed. If the probability that the toss results in a head is $\large\frac{31}{42}.$ then $n$=
answered
Nov 7, 2013
(a) 10
0
votes
The random variable takes the value $1,2,3,..........,m$. If $P(X=n)=\large\frac{1}{m}$ to each n, then the variance of $X$ is
answered
Nov 7, 2013
$(b)\;\frac{m^2-1}{12}$
0
votes
Two numbers are chosen at random from $\{1,2,3,4,5,6,7,8\}$ at a time. The probability that smaller of the two numbers is less than 4 is:
answered
Nov 7, 2013
$(c)\;\frac{9}{14}$
0
votes
If $\overrightarrow {a}$ and $\overrightarrow {b}$ are two non-zero perpendicular vectors, then a vector $\overrightarrow {y}$ satisfying equations $\overrightarrow {a}.\overrightarrow {y}=c$ (c scalar) and $\overrightarrow {a} \times \overrightarrow {y} = \overrightarrow {b}$ is
answered
Nov 7, 2013
$(c)\;\frac{1}{|\overrightarrow {a}|^2} ( c \overrightarrow a - (\overrightarrow a \times \overright...
0
votes
The shortest distance between the lines $ \overrightarrow {r}=3\overrightarrow {i}+5 \overrightarrow {j}+ 7 \overrightarrow {k}+ \lambda (\overrightarrow {i}+2 \overrightarrow {j}+\overrightarrow {k})$ and $\overrightarrow {r}=- \overrightarrow {i} -\overrightarrow {j} -\overrightarrow {k}+ \mu (7\overrightarrow {i}-6 \overrightarrow {j}+\overrightarrow {k}) $ is
answered
Nov 7, 2013
$(d)\;\frac{46}{5 \sqrt 5}$
0
votes
A unit vector co planar with $ \overrightarrow {i}+\overrightarrow {j}+ 3\overrightarrow {k}$ and $ \overrightarrow {i} +3 \overrightarrow {j}+ \overrightarrow {k}$ and perpendicular to $\overrightarrow {i}+ \overrightarrow {j}+ \overrightarrow {k}$ is
answered
Nov 7, 2013
$(c)\;\frac{1}{\sqrt 2}(\overrightarrow {j}- \overrightarrow{k})$
0
votes
$\overrightarrow {a} \neq \overrightarrow {0},\;\overrightarrow {b} \neq \overrightarrow {0},\;\overrightarrow {c} \neq \overrightarrow {0},\;\overrightarrow {a} \times \overrightarrow {b} = \overrightarrow {0},\;\overrightarrow {b} \times \overrightarrow {c}=0\;=>\; \overrightarrow {a} \times \overrightarrow {c}=$
answered
Nov 7, 2013
$(c)\;\overrightarrow {0} $
0
votes
$P,Q,R$ and $S$ are four points with the position vectors $3 \overrightarrow {i}- 4 \overrightarrow {j}+5 \overrightarrow {k}, 4 \overrightarrow {k},-4 \overrightarrow {i}+ 5\overrightarrow {j}+\overrightarrow {k}$ and $-3\overrightarrow {i}+ 4\overrightarrow {j}+3 \overrightarrow {k}$ respectively. Then the line $PQ$ meets the line RS at the point.
answered
Nov 7, 2013
$(b)\;-3 \overrightarrow {i}+4 \overrightarrow {j}+3 \overrightarrow {k}$
0
votes
The points whose position vectors are $2 \overrightarrow {i}+3 \overrightarrow {j}+4 \overrightarrow {k},\; 3 \overrightarrow {i}+4\overrightarrow {j}+2 \overrightarrow {k}$ and $4 \overrightarrow {i}+2 \overrightarrow {j}+3 \overrightarrow {k}$ are the verticies of
answered
Nov 7, 2013
(c) equilateral triangle
0
votes
If, in $\Delta\; ABC,\large\frac{1}{a+c}+\frac{1}{b+c}=\frac{3}{a+b+c}$ then the angle $C=$
answered
Nov 7, 2013
(c) $60^{\circ}$
0
votes
A person observes the top of a tower from a point A on the ground. The elevation of the tower from this point is $60^{\circ}$. He moves $60\;m$ in the direction perpendicular to the line joining A and base of the tower. The angle of elevation of the tower from this point is $45^{\circ}.$ Then the height of the tower (in meters) is
answered
Nov 7, 2013
$(a)\;60 \sqrt {\frac{3}{2}}$
0
votes
In any triangle $ABC, r_1r_2+r_2r_3+r_3r_1=$
answered
Nov 7, 2013
$(a)\;\frac{\Delta ^2}{r^2}$
0
votes
$\tan\; h^{-1} \bigg(\large\frac{1}{2}\bigg)$$+\cot h^{-1}(2)=$
answered
Nov 7, 2013
$(d)\;\log \;3$
0
votes
$\cos ^{-1} \bigg(\large\frac{5}{13}\bigg)$$+\cos ^{-1} \bigg(\large\frac{3}{5}\bigg)$$=\cos ^{-1} x=>x=$
answered
Nov 7, 2013
$(c)\;\frac{-33}{65}$
0
votes
$\sin \theta+\cos \theta=p, \sin ^3 \theta+\cos ^3 \theta=q=>p(p^2-3)=$
answered
Nov 7, 2013
(d) -2q
0
votes
If $\tan (\pi \cos \theta)=\cot (\pi \sin \theta)$ then a value of $ \cos \bigg( \theta-\large\frac{\pi}{4}\bigg)$ among the following is :
answered
Nov 7, 2013
$(a)\;\frac{1}{2\sqrt 2} $
0
votes
The set of solution of the system of equations: $x+y=\large\frac{2 \pi}{3}$ and $\cos x +\cos y=\large\frac{3}{2},$ where $x,y$ are real, is
answered
Nov 7, 2013
$(d)\;empty\;set$
0
votes
If a complex number z satisfies $|z^2-1|=|z|^2+1,$ then z lies on :
answered
Nov 7, 2013
(b) the imaginary axis
0
votes
$\large\frac{(1+i)x-i}{2+i}+\frac{(1+2i)y+i}{2-i}$$=1=>(x,y)=$
answered
Nov 7, 2013
$(a)\;\bigg[\frac{7}{3},\frac{-7}{15}\bigg]$
0
votes
The period of $f(x)=\cos \bigg(\large\frac{x}{3}\bigg)$$+\sin \bigg(\large\frac{x}{2}\bigg)$ is
answered
Nov 7, 2013
$(a)\;12 \pi$
0
votes
$\bigg(\large\frac{1+i}{1-i}\bigg)^4+\bigg(\frac{1-i}{1+i}\bigg)^4=$
answered
Nov 7, 2013
(c) 2
0
votes
The number of real values of $t$ such that the system of homogeneous equations:\[tx+(t+1)y+(t-1)z=0\]\[(t+1)x+ty+(t+2)z=0\] \[(t-1)x+(t+2)y+tz=0\] has non-trivial solutions, is
answered
Nov 7, 2013
(c) 1
0
votes
The system of equations $3x+2y+z=6, 3x+4y+3z=14, 6x+10 y +8z=a,$ has infinite number of solutions, if $a=$
answered
Nov 7, 2013
(d) 36
0
votes
$\begin{vmatrix} x+2 & x+3 & x+5 \\ x+4 & x+6 & x+9 \\ x+8 & x+11 & x+15 \end{vmatrix}=$
answered
Nov 7, 2013
$(d)\;-2 $
0
votes
If $A=\begin{bmatrix} -8 & 5 \\ 2 & 4 \end{bmatrix}$ satisfies the equation $x^2+4x-p=0,$ then $p=$
answered
Nov 7, 2013
(b) 42
0
votes
If $\alpha$ and $\beta$ are the roots of the equation $x^2-2x+4=0,$ then $\alpha^9+\beta ^9=$
answered
Nov 7, 2013
$(c)\;-2^{10}$
0
votes
If the roots of $x^3-42 x^2+336 x -512=0,$ are in increasing geometric progression, then its common ratio is
answered
Nov 7, 2013
(c) 4
0
votes
The set of solutions satisfying both $x^2+5x+6 \geq 0$ and $x^2+3x-4 < 0$ is:
answered
Nov 7, 2013
$(b)\;(-4,-3]\;\cup\;[-2,1)$
0
votes
If the harmonic mean between the roots of $(5+ \sqrt 2)x^2-bx+(8+ 2\sqrt 5)=0$ is $4$, then the value of b
answered
Nov 7, 2013
(d) $4 +\sqrt 5$
0
votes
$\large\frac{1}{2.3}+\frac{1}{4.5}+\frac{1}{6.7}+\frac{1}{8.9}+............$
answered
Nov 7, 2013
$(b)\;\log \bigg(\frac{e}{2}\bigg) $
0
votes
If $\large\frac{1}{x^4+x^2+1}=\frac{Ax+B}{x^2+x+1}+\frac{Cx+D}{x^2-x+1}$, then $C+D=$
answered
Nov 7, 2013
(d) 0
0
votes
If $x$ is small so that $x^2$ and higher powers can be neglected, then the approximate value for $\large\frac{(1-2x)^{-1}(1-3x)^{-2}}{(1-4x)^{-3}}$ is :
answered
Nov 7, 2013
(c) 1-4x
0
votes
The term independent of $x\;(x>0,x \neq 1)$ in the expansion of $\bigg[\large\frac{(x+1)}{ x^{2/3}-x^{1/3}+1)}-\frac{(x-1)}{(x -\sqrt x)}\bigg]^{10}$ is
answered
Nov 7, 2013
(b) 210
0
votes
If $t_n$ denotes the number of triangles formed with n points in a plane no three of which are collinear and if $t_{n+1}-t_n=36,$ then $n=$
answered
Nov 7, 2013
(c) 9
0
votes
10 men and 6 women are to be seated in a row so that no two women sit together. The number of ways they can be seated is :
answered
Nov 7, 2013
$(d)\;\large\frac{11 !\; 10 !}{5 !}$
0
votes
$^nC_{r-1}=330,\;^n C_r =462,\;^n C_{r+1}=462 =>r\;$=
answered
Nov 7, 2013
(c) 5
0
votes
If I is the identify matrix of order 2 and $A= \begin {bmatrix} 1 & 1 \\ 0 & 1 \end{bmatrix}$, then for $ n \geq 1$, mathematical induction gives
answered
Nov 7, 2013
$(a)\; A^n=nA-(n-1)I$
Page:
« prev
1
...
83
84
85
86
87
88
next »
Home
Ask
Tuition
Questions
Practice
Your payment for
is successful.
Continue
...