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CBSE XII
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A point charge Q is placed at point O as shown in the fig. Is the potential difference $V_A - V_B $ positive ? negative or zero, if Q is (i) Positive (ii) negative
cbse
class12
physics
ch-1
sec-a
q6
medium
asked
Apr 21, 2015
by
meena.p
1
answer
Write the SI unit for electric dipole moment
cbse
class12
physics
ch-1
sec-a
q5
easy
asked
Apr 21, 2015
by
meena.p
1
answer
Write the S.I unit of electric field intensity
cbse
class12
physics
ch-1
sec-a
q4
easy
asked
Apr 21, 2015
by
meena.p
1
answer
Name the physical quantity whose $S.I$ unit is $JC^{-1}$. Is it a scalar or a vector quantity.
cbse
class12
physics
ch-1
sec-a
q3
easy
asked
Apr 21, 2015
by
meena.p
1
answer
The force acting between two print charges $q_1$ and $q_2$ kept at some distance apart in air is attractive or repulsive when (i) q_1q_2 > 0 (ii) q_1 q_2 <0$
cbse
class12
physics
ch-1
sec-a
q2
easy
asked
Apr 21, 2015
by
meena.p
1
answer
Define the term electric dipole moment . Is it a scalar or a vector quantity ?
cbse
class12
physics
ch-1
sec-a
q1
easy
asked
Apr 21, 2015
by
meena.p
1
answer
Simplify the boolean expression
asked
Apr 16, 2015
by
hectordavid1995
1
answer
The variance of first 50 even natural numbers is :
the
variance
of
first
50
even
natural
numbers
is
asked
Mar 31, 2015
by
priyal_dps
1
answer
A dietician wants to develop a special diet using two foods X and Y. Each packet (contains 30g) of food X contains 12 units of calcium , 4 units of iron, 6 units of cholesterol and $6 \;units$ of vitamin A. Each packet of the same quantity of food Y contains 3 units of calcium, 20 units of iron , 4 units of cholesterol and 3 units of vitamin A. The diet requires at least 240 units of calcium , at least 460 units of iron and at most 300 units of cholesterol. Make an LPP to find how many packets of each food should be used to minimise the amount of vitamin A in the diet, and solve it graphically.
class12
cbse
boardexam
2015
set-1
sec-c
math
modelpaper
asked
Mar 23, 2015
by
meena.p
1
answer
A dealer deals in two items only - item A and item B . He has $Rs. 50,000$ to inverst and a space to store at most 60 items. An item A cost $Rs. 2500$ and item B costs $Rs. 500$. A net profit to him on item A is $Rs. 500$ and on item B is $Rs. 150$. If he can sell all the items that he purchases , how should he inverst his amount to have maximum profit ? Formulate an LPP and solve is graphically .
class12
cbse
boardexam
2015
set-1
sec-c
math
modelpaper
asked
Mar 23, 2015
by
meena.p
1
answer
Assume that the chances of a patient having a heart attack is $40\%$ . It is also assumed that a meditation and yoga course reduces the risk of heart attack by $30\%$ and the prescription of a certain drug reduces its chance by $25\%$ . At a time a patient can choose any one of the two options with equal probabilities . Its given that after going through one of the two options the patient selected at random suffers a heart attack. Find the probability that the patient followed a course of mediation and yoga.
class12
cbse
boardexam
2015
set-1
sec-c
math
modelpaper
asked
Mar 23, 2015
by
meena.p
1
answer
Find the vector and cartesian equation of the plane passing through the intersection of the planes $\overrightarrow {r} . (\hat i +\hat j+ \hat k)=6$ and $\overrightarrow {r} . (2\hat i +3\hat j+ 4 \hat k)=-5$ and the point $(1,1,1)$
class12
cbse
boardexam
2015
set-1
sec-c
math
modelpaper
asked
Mar 23, 2015
by
meena.p
1
answer
Solve the following differential equation , given that $y=0$ , then $ x= \large\frac{\pi}{4}: $$ \sin 2x \large\frac{dy}{dx}$$-y =\tan x$
class12
cbse
boardexam
2015
set-1
sec-c
math
modelpaper
asked
Mar 23, 2015
by
meena.p
1
answer
Find the general Solution of the differential equation $\large\frac{dy}{dx}=\frac{y^2}{xy-x^2}$
class12
cbse
boardexam
2015
set-1
sec-c
math
modelpaper
asked
Mar 23, 2015
by
meena.p
1
answer
Find the point on the curve $y= \large\frac{x}{1+x^2} $, Where the tangent to the curve has the greatest slope.
class12
cbse
boardexam
2015
set-1
sec-c
math
modelpaper
asked
Mar 23, 2015
by
meena.p
1
answer
Using integration , find the area bounded by the curve $y= |x-1|$ and $y= 3-|x|$
class12
cbse
boardexam
2015
set-1
sec-c
math
modelpaper
asked
Mar 23, 2015
by
meena.p
1
answer
Show that the relation R in the set $A= [1,2,3,4,5]$ given by $R= [(a,b):|a-b|] $ is divisible by 2. It is an equivalence relation . Show that all the elements of $[1,3,5]$ are related to each other and all the elements of $[2,4]$ are related to each other , but no element of ${1,3,5}$ is related to any element of $[2,4]$
class12
cbse
boardexam
2015
set-1
sec-c
math
modelpaper
asked
Mar 22, 2015
by
meena.p
1
answer
From a set of 100 cards numbered 1 to 100 , one card is drawn at random. Find the probability that the number on the card is divisible by 6 or 8, but not by 24.
class12
cbse
boardexam
2015
set-1
sec-b
math
modelpaper
asked
Mar 22, 2015
by
meena.p
1
answer
Find the vector and cartesian equations of the plane which bisects the line joining the points $(3,-2,1) $ and $(1,4,-3)$ at right angles.
class12
cbse
boardexam
2015
set-1
sec-b
math
modelpaper
asked
Mar 22, 2015
by
meena.p
1
answer
Let $P(3,2,6)$ be a point in the space and Q be a point on the line $ \overrightarrow{r} =(\hat i - \hat j +2 \hat k) +\mu (-3 \hat i +\hat j +5 \hat k ), $ then find the value of $\mu $ for ehich the vector $\overrightarrow{PQ}$ is parallel to the plane $x -4y+3z=1$
class12
cbse
boardexam
2015
set-1
sec-b
math
modelpaper
asked
Mar 22, 2015
by
meena.p
1
answer
Show that the lines $\large\frac{x-1}{3} =\frac{y-1}{-1}$$,z+1=0$ and $\large\frac{x-4}{2} =\frac{z+1}{3}$$,y=0$ intersect each other . Also find their point of intersection .
class12
cbse
boardexam
2015
set-1
sec-b
math
modelpaper
asked
Mar 22, 2015
by
meena.p
1
answer
Evaluate : $\lim \int \limits _0^{\pi} \large\frac{x \tan x }{\sec x . \tan x}$$dx$
class12
cbse
boardexam
2015
set-1
sec-b
math
modelpaper
asked
Mar 22, 2015
by
meena.p
1
answer
Find $\int \limits_0^2 (x^2+e^{2x+1)}dx$ as the limit of a sum
class12
cbse
boardexam
2015
set-1
sec-b
math
modelpaper
asked
Mar 22, 2015
by
meena.p
1
answer
find the general solution of differential equation $\frac{dy}{dx} =\frac{\sqrt{y}}{xy} - \sqrt{x} $
asked
Mar 21, 2015
by
sumi011997
0
answers
Evaluate : $\int x. \sin ^{-1}x dx$
class12
cbse
boardexam
2015
set-1
sec-b
math
modelpaper
asked
Mar 20, 2015
by
meena.p
1
answer
Find : $\int \large\frac{1- \cos x}{\cos x (1+\cos x)}$$dx$
class12
cbse
boardexam
2015
set-1
sec-b
math
modelpaper
asked
Mar 20, 2015
by
meena.p
1
answer
If $y= \sqrt {x+1} -\sqrt {x-1} $, prove that $(x^2-1) \large\frac{d^2y}{dx^2} $$+x\large\frac{dy}{dx} -\frac{1}{4}$$y=0$
class12
cbse
2015
set-1
sec-b
math
boardexam
modelpaper
asked
Mar 20, 2015
by
meena.p
1
answer
If $\log \sqrt {x^2+y^2}=\tan ^{-1} \bigg( \large\frac{x}{y} \bigg)$, then show that $\large\frac{dy}{dx}=\frac{y-x}{y+x}$
class-12
cbse
2015
set-1
sec-b
asked
Mar 20, 2015
by
meena.p
1
answer
If $y=x^{2^{-x^2}}$, find $\large\frac{dy}{dx}$
class12
cbse
2015
set-1
sec-b
math
boardexam
modelpaper
asked
Mar 20, 2015
by
meena.p
1
answer
If function $f(x) =|x-3| +|x-4| $, then show that $f(x)$ is not differentiable at $x=3$ and $x=4$
class12
cbse
boardexam
2015
set-1
sec-b
math
modelpaper
asked
Mar 20, 2015
by
meena.p
1
answer
Find the inverse of matrix $A=\begin{bmatrix} 3 & -1 & 1 \\ -15 & 6 & -5 \\ 5 & -2 & 2 \end{bmatrix}$ and hence show that $A^{-1} .A =I$
class12
cbse
2015
set-1
sec-b
math
boardexam
modelpaper
asked
Mar 19, 2015
by
meena.p
1
answer
If $ X\begin{bmatrix} 1 & 2 & 3 \\4 & 5 & 6 \end{bmatrix}=\begin{bmatrix} -7 & -8 & -9 \\2 & 4 & 6 \end{bmatrix}$, then find the matrix X.
class12
cbse
2015
set-1
sec-b
math
boardexam
modelpaper
asked
Mar 19, 2015
by
meena.p
1
answer
If $ a \neq b \neq c$ and $\begin{vmatrix}a & b & c \\b & c & a \\c & a & b \end{vmatrix}$$=0$ , then using properties of determinants, prove that $a+b+c=0$
class12
cbse
2015
set-1
sec-b
math
boardexam
modelpaper
asked
Mar 19, 2015
by
meena.p
1
answer
If $\tan ^{-1} x+\tan ^{-1}y+\tan ^{-1} z= \large\frac{\pi}{2}$$,x,y,z>0$, then find the value of $xy+yz+zx$
class12
cbse
2015
set-1
sec-b
math
boardexam
modelpaper
asked
Mar 19, 2015
by
meena.p
1
answer
There are 3 families A,B and C. The number of men , women and children in these are as under : Dairy expense of men , women and children are $ Rs 200, Rs .150$ and $Rs 200$ respectively. Only men and women earn and children or not. using matrix multiplication , calculate the dairy expenses of each family. What impact does more children in the family create on the society ?
class12
cbse
2015
set-1
sec-b
math
boardexam
modelpaper
asked
Mar 19, 2015
by
meena.p
1
answer
Write the direction cosines of the normal to the plane $3x+4y+12z=52$
class12
cbse
2015
set-1
sec-a
math
boardexam
modelpaper
asked
Mar 19, 2015
by
meena.p
1
answer
Write the value of $\hat i. (\hat j \times \hat k) + \hat j .( \hat k \times \hat i) +\hat k.(\hat i \times \hat j)$.
class12
cbse
2015
set-1
sec-a
math
boardexam
modelpaper
asked
Mar 19, 2015
by
meena.p
1
answer
Write the projection of vector $2 \hat i +3 \hat j - \hat k$ along the vector $\hat i +\hat j$
class12
cbse
2015
set-1
sec-a
math
boardexam
modelpaper
asked
Mar 19, 2015
by
meena.p
1
answer
Write a differential equation $y= A \cos \alpha x + B \sin \alpha x$ , where A and B are arbitrary constants .
class12
cbse
2015
set-1
sec-a
math
boardexam
modelpaper
asked
Mar 19, 2015
by
meena.p
1
answer
Find the product of the order and degree of the following different equation : $x \bigg(\large\frac{d^2y}{dx^2} \bigg) +\bigg(\large\frac{dy}{dx}\bigg)^2$$+y^2=0$
class12
cbse
2015
set-1
sec-a
math
boardexam
modelpaper
asked
Mar 19, 2015
by
meena.p
1
answer
Write a $ 3\times 3$ skew symmetric matrix
class12
cbse
2015
set-1
summative-2
sec-a
math
boardexam
modelpaper
asked
Mar 19, 2015
by
meena.p
1
answer
let A = (-1,0,1,2) B=(-4,-2,0,2) and f, g:A->B be functions defined by f(x)=X2-X and g(x)=2| x-1/2 |, -1 x belongs to A. Are f and g equal?
asked
Mar 17, 2015
by
krishvlk
1
answer
Integrate dx/(x4 + x2 +81)
asked
Mar 15, 2015
by
krishnan.1961
1
answer
evaluate $ \int \limits_0 ^ {\pi} \large\frac{x}{(1+\sin x)}$$dx$
class12
sec-b
asked
Mar 14, 2015
by
ahammedshamil.k
2
answers
A hollow cone is cut by a plane parallel to the base and the upper portion is removed. If the curved surface of the remainer is $\large\frac{8}{9}$ of the curved surface of the whole cone, find the ratio of the line-segment into which the cone’s altitude is divided by the plane.
cbse
class10
math
sa-2
modelpaper
mock-test-series-2015
sec-d
asked
Feb 19, 2015
by
meena.p
1
answer
$ \sqrt { 1+ \large\frac{x}{144}}=\frac{13}{12}$ then x is equal to
olympiad
math
ch-2
linear-equations-in-one-variable
class8
asked
Feb 11, 2015
by
meena.p
1
answer
The average of $11,12,13,14$ and x is $13$. The value of x is
olympiad
math
ch-2
linear-equations-in-one-variable
class8
asked
Feb 11, 2015
by
meena.p
1
answer
a)A capacitor is used in the primary circuit of induction coil why? b)A power transmission line feeds input power at $2300\;V$ to a step down transformer with its primary windings having $4000$ turns. What should be the number of turns in the secondary in order to get the output power at $230\;V$? c)What is the peak value at $22V\; AC$?
cbse
class12
physics
modelpaper
mock-test-series-2015
asked
Feb 11, 2015
by
meena.p
0
answers
Derive an expression for the impedance of a series L-C-R circuit connected to an AC supply of variable frequency. Plot a graph showing the variation of current with the frequency of the applied voltage. Explain briefly how the phenomenon of resonance in the circuit can be used in the tuning mechanism of a radio or a TV set?
cbse
class12
physics
modelpaper
mock-test-series-2015
asked
Feb 11, 2015
by
meena.p
0
answers
An AC voltage of peak $20\;V$ is connected in series with a silicon diode and a load resistance of $500 \Omega$. The forward resistance of the diode is $10 \Omega$ and the barrier voltage is $0.7\;V$. Find the peak current through diode and the peak voltage across the load. What will happen to these values if the diode is assumed to be ideal?
cbse
class12
physics
modelpaper
mock-test-series-2015
asked
Feb 11, 2015
by
meena.p
1
answer
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