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Questions from: Math
The potential difference across the collector of a transistor, used in common emitter mode is $1.5\;V,$ with the collector resistance of $3\;k \Omega.$ Find 1. The emitter and 2. The base current, if the d.c. gain of the transistor is $50$
cbse
class12
physics
modelpaper
mock-test-series-2015
answered
Dec 12
by
mg.sankkar
1
answer
Two bags A and B contain 2 white, 4 red and 3 white, 3 red balls respectively. One of the bags is selected at random and a ball is drawn from it. If the selected ball is of white colour, find the probability that it is drawn from bag A.
cbse
class12
modelpaper
2012
sec-b
q22
math
answered
Dec 6
by
hrithwikp
1
answer
Verify Lagrange's mean value theorem for the following function : \( f(x) = \sin \: x - \sin\: 2x \: in \: [0, \pi ] \)
cbse
class12
modelpaper
2012
sec-b
q14
math
answered
Dec 6
by
kp5018800
1
answer
A catering agency has two kitchen to prepare food at two places A and B. From these places 'Mid-day Meal' is to be supplied to three different schools situated at P, Q , R. The monthly requirement of the school are respectively 40,40 and 70 food packets. A packet contains lunch for 1000 students. The capacity of kitchen A and B are 60 and 70 packets per month respectively. The transportation cost per packets from the kitchens to school is given below : How many packets from each kitchen should be transported to school so that the cost of transportation is minimum? Also find the minimum cost.
cbse
class12
modelpaper
2012
sec-c
q29
math
answered
Nov 30
by
vanshgreat08
1
answer
Find the scalar and vector components of the vector with initial point ( 2, 1 ) and terminal point ( -5, 7 ).
cbse
class12
modelpaper
2012
sec-a
q9
math
answered
Nov 29
by
ranjani.hogwarts
1
answer
tan^-1 + cos^-1(-1/2) + sin^-1(-1/2)
answered
Nov 24
by
gujjarkavitakasana
1
answer
Show that the four points ( 0, -1, -1 ), ( 4, 5, 1 ) and (-4, 4, 4 ) are coplanar. Also find the equation of the plane containing them.
cbse
class12
modelpaper
2011
sec-b
q21
math
answered
Nov 21
by
lneha286
1
answer
Examine which of the following is a binary operation.
cbse
class12
modelpaper
2012
sec-b
q12
math
answered
Nov 21
by
basumbonika96
1
answer
State the relation between the frequency $\gamma$ of radiation emitted by LED and the band gap energy $E$ of the semiconductor used to fabricate it .
cbse
class12
physics
modelpaper
mock-test-series-2015
answered
Nov 20
by
sukhnoorsingh234
1
answer
Find the equation of plane determined by the points A(3, -1, 2), B(5, 2, 4) and C(-1, -1, 6). Also find the distance of the point P(6, 5, 9) from the plane.
cbse
class12
modelpaper
2012
sec-c
q27
math
answered
Nov 17
by
adithya.vinod
1
answer
Find the foot of the perpendicular drawn from the point A(1,0,3) to the join of the points B(4,7,1) and C(3,5,3)
cbse
class12
additionalproblem
kvquestionbank2012
ch11
q11
p37
math
answered
Nov 10
by
gargtanu21
1
answer
Coloured balls are distributed in three bags as shown in the table below, a bag is selected at random and then two balls are randomly drawn from the selected bag. They happen to be black and red. what is the probability that they came from bag 1 ?
cbse
class12
modelpaper
2009
sec-c
q27
math
answered
Nov 7
by
classicshameer10
1
answer
Two dice are thrown. Find the probability that the number appeared have a sum 8 if it is known that second dice always exhibits 4.
cbse
class12
additionalproblem
kvquestionbank2012
ch13
q45
p43
math
answered
Nov 2
by
sk334122
1
answer
Prove that an angle in a semi-circle is a right angle (using vector only).
cbse
class12
modelpaper
2012
sec-b
q18
math
answered
Oct 30
by
ranjani.hogwarts
1
answer
Solve the differential equation \( (x+y)dy+(x-y)dx=0\)
cbse
class12
modelpaper
2012
sec-b
q19
math
answered
Oct 25
by
avinashanand2017
1
answer
Solve the differential equation: dy/dx=(x+y+1)/(x+y)
answered
Oct 21
by
niteshp282000
1
answer
What is the polarizing angle of medium of refractive index $1.732$?
cbse
class12
physics
modelpaper
mock-test-series-2015
answered
Oct 12
by
lujianathary
1
answer
The surface area of a balloon being inflated, changes at a rate proportional to time t. If initially its radius is 1 unit and after 3 seconds it is 2 units, find the radius after time 't'.
cbse
class12
additionalproblem
kvquestionbank2012
ch9
q23
p34
sec-a
math
answered
Oct 7
by
goyalpriyanka4567
1
answer
Show that the height of the cylinder of maximum volume that can be inscribed in a sphere of radius R is \( \frac{2R}{\sqrt 3} \). Find the volume of the largest cylinder inscribed in a sphere of radius R.
cbse
class12
modelpaper
2012
sec-c
q26
math
answered
Sep 28
by
ramssunny77
1
answer
The force on an electron kept in an electric field in a particular direction is F. What will be the magnitude and direction of the force experienced by a proton kept at the same point in the filed ? Mass of the proton is about $1836$ times the mass of the electron
cbse
class12
physics
ch-1
sec-a
q22
difficult
answered
Sep 2
by
aditya.p2410
2
answers
Evaluate : $ \int \tan^{-1} \sqrt{ \large\frac{1-sinx}{1+sinx}}dx. $
cbse
class12
modelpaper
2012
sec-b
q18
math
answered
Aug 9
by
bhaskar.kumar582000
1
answer
A metallic sphere is placed in a uniform electric field as shown in the figure. which path is folllowed by electric field lines? why ?
cbse
class12
physics
ch-1
sec-a
q39
medium
answered
Aug 9
by
saniasalam2017
2
answers
Evaluate : $\tan^{-1} (1) + cos^{-1} ( \frac{-1}{2} )+ \sin^{-1} (\frac{-1}{2})$
cbse
class12
maths
sec-e
ch3
answered
Jul 16
by
punitakharb430
2
answers
Let A = N x N and * be a binary operation on A defined by (a,b)*(c,d)=(ac,bd), show that : (i) (A*) is commutative. (ii) (A*) is associative (iii) Find the identity element, if any, in A.
cbse
class12
modelpaper
2012
sec-c
q23
math
answered
Jul 8
by
s.kpandey26
1
answer
If $ A=\begin{bmatrix} 3 & 1 \\ 7 & 5 \end{bmatrix}$ find x and y such that $ A^2+xl=yA.\;Find\;A^{-1}.$
cbse
class12
additionalproblem
kvquestionbank2012
ch3
q16
p8
math
sec-b
answered
Jun 20
by
vasuloki708
1
answer
Show that of all the rectangles of given area, the square has the smallest perimeter.
cbse
class12
modelpaper
2012
sec-c
q24
math
answered
Jun 9
by
anshikamaheshwari28
1
answer
For what value of k is the following function continuous at x = 2? $ f(x) = \left\{ \begin{array}{l l} 2x+1, & \quad { x < 2}\\ k, & \quad \text{ $x$ = 2} \\ 3x-1, & \quad \text{ $x$ > 2} \end{array}. \right.$
cbse
class12
modelpaper
2012
sec-b
q14
math
answered
May 29
by
dwivediprachi09
1
answer
Give an example of relation which is reflexive but neither symmetric nor transitive.
cbse
class12
modelpaper
2012
sec-a
q1
math
answered
Apr 11
by
harishahmad6
1
answer
A square piece of tin of side 24 cm is to be made into a box without top by cutting a square from each corner and folding up the flaps to form a box. What should be the side of the square to be cut off so that volume of the box is maximum?
cbse
class12
modelpaper
2012
sec-c
q24
math
answered
Apr 9
by
rahulrkchauhan123456789
1
answer
A coin is based so that the head is 3 times as likely to occur as tail. If the coin is tossed three times, find the probabilty distribution of number of tails.
cbse
class12
modelpaper
2011
sec-b
q22
math
answered
Mar 20
by
akkhola2000
1
answer
A catering agency has two kitchens to prepare food at two places A and B. From these place " Mid-day meal' is to be supplied to three different schools situated at P, Q, R. The monthly requirements of the schools are respectively 40, 40 and 50 food packets. A packet contains lunch for 1000 students. Preparing capacity of kitchen A and B are 60 and 70 packets per month respectively. The transportation cost per packet for the kitchen to school is given below. How many packets from each kitchen should be transported to school so that the cost of transportation is minimum? Also find the minimum cost.
cbse
class12
modelpaper
2008
sec-b
q24
math
answered
Mar 20
by
prakashkumarsingh.ktr
1
answer
The function $ f(x)=2 log (x-2) - x^2+4x+1 $increases in the interval.\[(a)\;(1,2)\qquad(b)\;(2,3)\qquad(c)\;(5/2,3)\qquad(d)\;(2,4)\]
cbse
class12
additionalproblem
kvquestionbank2012
ch6
q2
p16
math
answered
Mar 7
by
ranjani.hogwarts
1
answer
The mean and variance of a binomial distribution are $ 4 \;and\;\frac{4}{3}.\;Find\;P(X\geq1).$
cbse
class12
additionalproblem
kvquestionbank2012
ch13
q16
p41
math
answered
Feb 26
by
Sumitchn007
1
answer
An open box is to be constructed by removing equal squares from each corner of a 3 metre by 8 metre rectangular sheet of aluminium and folding up the sides. Find the volume of the largest such box.
cbse
class12
modelpaper
2012
sec-c
q33
math
answered
Feb 23
by
pady_1
1
answer
The plane ax+by=0 is rotated about its line of intersection with the plane z=0 through an angle $\alpha$.Prove that the equation of the plane in its new position is $ax+by\pm \bigg(\sqrt {a^2+b^2}\tan \alpha\bigg)z=0$.
cbse
class12
ch11
q23
p237
exemplar
sec-c
math
answered
Feb 4
by
sanjamdeep30
1
answer
A metal has a threshold wavelength of $6000 ^{\circ} A$. Calculate its 1) threshold frequency and 2) work function of the metal in eV.
cbse
class12
physics
modelpaper
mock-test-series-2015
answered
Jan 31
by
arunamansingh5
1
answer
In a game, a man wins a rupee for a six and loses a rupee for any other number when a fair die is thrown. The man decided to throw a die thrice but to quit as and when he gets a six. Find the expected value of the amount he wins / loses.
cbse
class12
bookproblem
ch13
misc
p583
q11
sec-b
easy
math
answered
Jan 28
by
sristijain30
2
answers
Solve the following differential equation : $ \cos^2\: x\large\frac{dy}{dx}$$+y=\tan x$
cbse
class12
modelpaper
2012
sec-b
q18
math
answered
Jan 27
by
chodadeepak14
1
answer
Prove that relation R defined on the set N of natural numbers by \[x\;R\;y \Leftrightarrow 2x^2-3xy+y^2=0\] is not symmetric but it is reflexive.
cbse
class12
additionalproblem
kvquestionbank2012
ch1
q27
p4
math
sec-b
answered
Jan 24
by
nimmisivapuri.d5
1
answer
Let $f : A \rightarrow B$ be a given function. A relation R in the set A is given by $R = {(a,b) \varepsilon A \times A : f(a) = f(b)}.$ Check, if R is an equivalence relation.
cbse
class12
additionalproblem
kvquestionbank2012
ch1
q23
p4
math
sec-b
answered
Jan 24
by
nimmisivapuri.d5
1
answer
Find the values of P so that the lines $ \Large\frac{1-x}{3}=\frac{7y-14}{2p}=\frac{z-3}{2}$ and $ \Large\frac{7-7x}{3p}=\frac{y-5}{1}=\frac{6-z}{5}$ are at right angles.
cbse
class12
additionalproblem
kvquestionbank2012
ch11
q16
p38
math
answered
Jan 23
by
adarsh06032000
1
answer
find the equation of the normal to the curve y=x^3+2x^2 at x=0 find the coo
math
asked
Jan 18
by
samwarke2000
0
answers
Two cards are drawn one by one without replacement from well shuffled pack of 52 cards. Find the probability distribution of the number of aces.
cbse
class12
modelpaper
2012
sec-b
q15
math
answered
Jan 17
by
mahawarravi036
2
answers
Probabilities of solving a specific problem independently by A and B are \( \frac{1}{2} \: and \frac{1}{3} \) respectively. If both try to solve the problem independently, find the probability that (i) the problem is solved (ii) exactly one of them solves the problem.
cbse
class12
modelpaper
2012
sec-b
q22
math
answered
Jan 14
by
next2unonu
1
answer
There are two bags I and II. Bag I contains 2 white and 3 red balls and Bag II contains 4 white and 5 red balls. One ball is drawn at random from one of the bags and is found to be red. Find the probability that it was drawn from bag II.
cbse
class12
modelpaper
2012
sec-b
q21
math
answered
Jan 3
by
zawude.tame
1
answer
True or False: If the determinant $\small\begin{vmatrix}x+a & p+u & l+ f\\y+b & q+v & m +g\\z+c & r+w & n + h\end{vmatrix}$ splits into exactly $k$ determinants of order $3$, each element of which contains online term,then the value of $k$ is $8$.
cbse
class12
ch4
q56
p84
true-or-false
exemplar
sec-a
math
answered
Dec 6, 2017
by
priyanka.c
1
answer
Find the scalar components and magnitude of the vector joining the points $P (x_1, y_1, z_1)$ and $Q (x_2, y_2, z_2)$.
cbse
class12
bookproblem
sec-a
easy
ch10
math
answered
Dec 6, 2017
by
priyanka.c
1
answer
Reshma wishes to mix two types of food P and Q in such a way that the vitamin contents of the mixture contains atleast 8 units of vitamin A and 11 units of vitamin B. Food P costs Rs. 60/kg and food Q costs Rs. 80/kg. Food P contains 3 units/kg of vitamin A and 5 units of vitamin B, while food Q contains 4 units/kg of vitamin A and 2 units/kg of vitamin B. Determine the minimum cost of the mixture.
cbse
class12
modelpaper
2012
sec-c
q29
math
answered
Dec 2, 2017
by
taha.ba16
1
answer
Evaluate : $ \begin{bmatrix} a+ib & c+id \\ -c+id & a-ib \end{bmatrix} $
cbse
class12
modelpaper
2012
sec-a
q3
math
answered
Nov 22, 2017
by
rabindrasinghrouth
1
answer
Give an account of Hershey and Chase experiment. What did it conclusively prove? If both DNA and pro
cbse
class12
ch6
exemplar
theoryquestion
biology
sec-e
molecular basis of inheritance
asked
Jul 5, 2017
by
pady_1
1
answer
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