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Recent questions and answers in CBSE XII
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CBSE XII
CBSE XII
Math
Physics
Chemistry
Biology
Let * be a binary operation on the set of real numbers. If a * b = a+b-ab, 2 * ( 3 * x ) = -7, find the value of x.
cbse
class12
additionalproblem
kvquestionbank2012
ch1
q3
p3
math
sec-b
answered
Apr 26
by
kuppurajanbharathi
1
answer
A, B and C are engaged in a printing business. A being the working partner, receives 10% of the net profit as salary. The remaining profit is divided among themselves in the ratio 4:5:9. If A gets in total Rs. 3,00,000, find the total profit in the business and the shares of B and C in it.
cbse
class12
modelpaper
2005
sec-c
q23
math
answered
Dec 22, 2020
by
makumarsahu2004
1
answer
A furniture firm manufactures chairs and tables, each requiring the use of three machines A, B and C. Production of each chair requires 2 hours on machine A, 1 hour on machine B and 1 hour on machine C. Each table requires 1 hour each on machine A and B and 3 hours on machine C. The profit obtained by selling one chair is Rs. 30 while by selling one table the profit is Rs. 60. The total time available per week on machine A is 70 hours, on machine B is 40 hours and on machine C is 90 hours. How many chairs and tables should be made per week so as to maximise profit? Formulate the problem as LPP and solve it graphically.
cbse
class12
modelpaper
2012
sec-c
q28
math
answered
Dec 11, 2020
by
ms21012003
1
answer
What is the Role of Catalyst in a Chemical Reaction
cbse
class 12
chemistry
chemical kinetics theory question
answered
Nov 4, 2020
by
shresthasushma628
2
answers
Find the present worth of an ordinary annuity of Rs. 1,200 per annum for 10 years at 12% per annum, compounded annually. [Use (1.12) -10 =0.3221]
cbse
class12
modelpaper
2005
sec-c
q24
math
answered
Oct 31, 2020
by
sarikabora999
1
answer
There are two families P and Q. There are 3 men, 3 women and 12 children in family P and 2 men, 2 women and 4 children in family Q. The recommended daily allowance for calories is : Man : 2400, woman : 2000, child: 1400 and man : 60 g for proteins is : woman: 40 g and child: 35 g. (i) Represent the above information by matrices. Using matrix multiplication, calculate the total requirement of calories and proteins of each of the two families.
cbse
class12
modelpaper
2012
sec-b
q13
math
answered
Oct 25, 2020
by
sharmaaseem2406
1
answer
Solve the following LPP graphically. Maximize or minimize Z = 3x+5y subject to \[3x-4y\geq-12\]\[2x-y+2\geq0\]\[2x+3y-12\geq0\]\[0\leq x\leq4\]\[y\geq2\]
cbse
class12
additionalproblem
kvquestionbank2012
ch12
q7
p40
math
answered
Oct 19, 2020
by
rvandana115
1
answer
A pure inductor is connected across an a.c. source. Show mathematically that the current in it lags behind the applied e.m.f by a phase angle of $\large\frac{\pi}{2}$ What is its inductive reactance? Draw a graph showing variation of inductive reactance with the frequency of the a.c. source.
cbse
class12
physics
modelpaper
mock-test-series-2015
answered
Oct 17, 2020
by
badalbhardwaj2
1
answer
Most common monomer of carbohydrate is
cbse
class12
biology
zoology
neet
sec-a
answered
Oct 6, 2020
by
taneeshdx999
1
answer
A toy company manufactures two types of dolls, A and B. Each doll of type B takes twice as long as to produce as one of type A. If the company produces only type A. It can make a maximum of 2000 dolls per day. The supply of plastic is sufficient to produce 1500 dolls per day. Type B requires a fancy dress which cannot be available for more than 600 per day. If the company makes profit of Rs.3 and Rs.5 per doll respectively on doll A and doll B, how many of each should be produced per day in order to maximise the profit?
cbse
class12
modelpaper
2012
sec-c
q24
math
answered
Oct 5, 2020
by
rise.sparkle13
1
answer
Solve:\[ydx-(x+2y)^2dy=0\]
cbse
class12
additionalproblem
kvquestionbank2012
ch9
q9
p33
sec-b
math
answered
Oct 1, 2020
by
gilledobaleros
1
answer
Important site of formation of glycoproteins and glycolipids is
cbse
class12
biology
botany
neet
sec-a
answered
Sep 13, 2020
by
pady_1
1
answer
The term “CPR” often used in first aid stands for
cbse
class12
biology
zoology
neet
sec-a
answered
Aug 31, 2020
by
murugesan9486089328
1
answer
In human females, menstruation can be defined by administration of
cbse
class12
biology
zoology
neet
sec-a
answered
Jul 19, 2020
by
kphasnashirin
1
answer
The inheritance of flower colour in Antirrhinum is an example of
cbse
class12
biology
botany
neet
sec-a
answered
Jul 19, 2020
by
kphasnashirin
1
answer
Using matrices, solve the following : $2x+y-3z=13; x+y-z=6 ;2x-y+4z = -12$
cbse
class12
modelpaper
2012
sec-c
q23
math
answered
Jul 9, 2020
by
hjaspinder
1
answer
Several plant and animal species present together at a place constitute a
cbse
class12
biology
botany
neet
sec-a
answered
Jul 8, 2020
by
andyrich1972november
1
answer
If at high altitudes , birds become rare, plants likely to disappear are:
cbse
class12
biology
botany
neet
sec-a
answered
Jun 19, 2020
by
abhicjraj
1
answer
First code of every mRNA is
cbse
class12
biology
botany
neet
sec-a
answered
May 28, 2020
by
sarthakj451
1
answer
Use definite integration, find the area of triangle whose vertices are (-1,6),(1,2) and (5,4).
cbse
class12
modelpaper
2012
sec-c
q25
math
answered
May 21, 2020
by
sreejaunnikrishnan161
1
answer
The given graph shows the range of variation among population members for a trait determined by mutated genes. If this population is subjected to disruptive selection for several generations, which of the following distribution is most likely to result?
cbse
class12
biology
zoology
neet
sec-a
answered
May 8, 2020
by
kimbbrownn
1
answer
In the given food web, an increase in the population of hawks will not result in
cbse
class12
biology
botany
neet
sec-a
answered
Apr 11, 2020
by
srivastavshivam359
1
answer
Which one is useful to remove oil stains in laundry?
cbse
class12
biology
zoology
neet
sec-a
answered
Apr 4, 2020
by
faisalsergio16
1
answer
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
answered
Apr 2, 2020
by
manishkr1456
1
answer
Show that the area enclosed by the circle $ x^2+y^2=64a^2$ and the parabola $y^2=12ax$ is $ a^2 \bigg(\frac{16}{\sqrt 3}+\large\frac {64\pi}{\sqrt 3}\bigg)$
cbse
class12
additionalproblem
kvquestionbank2012
ch8
q5
p31
math
answered
Apr 1, 2020
by
aparme03
1
answer
Which one of the following feature is common to prokaryotes and many eukaryotes?
cbse
class12
biology
botany
neet
sec-a
answered
Mar 21, 2020
by
bhushu559
1
answer
Let $f:R_+\rightarrow[-5,\infty) $ given by $f(x)=9x^2+6x-5.$ show that f is invertiable with $ f^{-1}(y)=\frac{\sqrt{y+6}-1}{3}.$
cbse
class12
additionalproblem
kvquestionbank2012
ch1
q16
p3
math
sec-b
answered
Mar 21, 2020
by
hk0312109
1
answer
Which of the following statement is/are not correct for single cell proteins?i. The biomass is obtained from unicellular microorganisms only. ii. It provides protein rich supplements iii. SCP can be produced by bacteria and algae but not fungi. iv. It helps to minimize environmental pollution. v. SCP has be processed before use
cbse
class12
biology
botany
neet
sec-a
answered
Mar 20, 2020
by
hr4096204
1
answer
Give an example to show that the relation R in the set of natural numbers, defined by \( R = ( (x,y), x, y \in\: N, x \leq \: y^2) \) is not transitive.
cbse
modelpaper
2012
sec-a
q1
answered
Mar 20, 2020
by
neelurani06041980
1
answer
The area of the region in the first quadrant enclosed by the x-axis,the line y=x and the circle $x^2+y^2=32$ is \begin{array}{1 1}(A)\;16\pi\; sq.units & (B)\;4\pi \;sq.units\\(C)\;32\pi\; sq.units & (D)\;24\pi\;sq.units \end{array}
cbse
class12
ch8
q27
p178
objective
exemplar
sec-b
difficult
math
answered
Mar 17, 2020
by
kharbans823
2
answers
Which one is related with steroids?
cbse
class12
biology
zoology
neet
sec-a
answered
Mar 17, 2020
by
shivayfitness45
2
answers
What is the degree of the following differential equation? $ y\large\frac{d^2y}{dx^2}+\bigg(\frac{dy}{dx} \bigg)^3$$=x \bigg( \large\frac{d^3y}{dx^3} \bigg)^2 $
cbse
class12
modelpaper
2012
sec-a
q7
math
answered
Mar 17, 2020
by
anilmathappsc
1
answer
Find the order and degree of the differential equation $\bigg[ 1+ \bigg(\large \frac{dy}{dx} \bigg)^2 \bigg]^{\large\frac{3}{2}} = \frac{d^2y}{dx^2} $
cbse
class12
modelpaper
2012
sec-a
q7
math
answered
Mar 17, 2020
by
anilmathappsc
1
answer
Find the area of the region enclosed between the circles $ x^2+y^2=1\;and\;\bigg(x-\frac{1}{2}\bigg)^2+y^2=1$
cbse
class12
additionalproblem
kvquestionbank2012
ch8
q23
p32
math
answered
Mar 16, 2020
by
msq6786
1
answer
How does primary sludge differ from activated sludge? What type of changes in the sludge is carried out in anaerobic sludge digester? Give the composition of biogas produced in the sewage treatment plant.
cbsc
class 12
biology
microbes in humans welfare
sec-d
answered
Mar 12, 2020
by
momisingh14
2
answers
Let X denote the sum of the numbers obtained when two fair dice are rolled. Find the variance and standard deviation of X.
cbse
class12
bookproblem
ch13
sec4
p571
q13
sec-b
medium
math
answered
Feb 18, 2020
by
surafelalemgirma91
2
answers
Find the equation of the plane passing through the intersection of planes \( 4x-y+z=10\: and \: x+y-z=4\) and parallel to the line with direction ratios < 2, 1, 1>. Find also the perpendicular distance of (1, 1, 1) from the plane.
cbse
class12
modelpaper
2012
sec-c
q24
math
answered
Feb 17, 2020
by
jyotiverma221997
1
answer
Given figure represents the maturation of pro insulin into insulin. Identify the product A.
cbse
class12
biology
zoology
neet
sec-a
answered
Jan 22, 2020
by
vishup1912
1
answer
Fruit shape in Shepherd’s purse (Capsella bursa) is of two types- triangular and top shaped. Triangular fruit shape (T) is dominant over top shape (t). Following table summarizes the results of the several crosses. Which pair of strains possess genotype Tt?
cbse
class12
biology
botany
neet
sec-a
answered
Jan 11, 2020
by
badboyayandeep96
1
answer
A certain patient is suspected to be suffering from AIDS. Which diagnostic technique will you recommend for its detection?
cbse
class12
biology
zoology
neet
sec-a
answered
Dec 29, 2019
by
guptahema1975
1
answer
Which of the following is not required in the preparation of a recombinant DNA molecule?
cbse
class12
biology
zoology
neet
sec-a
answered
Dec 29, 2019
by
jaswalvipin1988
1
answer
Hormone responsible for the growth of root in micro propagation is
cbse
class12
biology
botany
neet
sec-a
answered
Dec 28, 2019
by
diptichauhan3112
1
answer
Find the area of the segment cut off from the parabola $ y^2=2x$ by the line $ y=4x-1$
cbse
class12
additionalproblem
kvquestionbank2012
ch8
q4
p31
math
answered
Dec 22, 2019
by
gourishanker2431
1
answer
Choose the correct statement amongst the following
cbse
class12
biology
botany
neet
sec-a
answered
Dec 12, 2019
by
mishraashish896
1
answer
Assertion: Asexual reproduction involves formation of clone of an organism <br> Reason: Clones are morphologically and genetically similar individuals.
cbse
class12
biology
botany
neet
sec-a
answered
Dec 10, 2019
by
madhurihodscience
1
answer
Bt toxin is not toxic to human beings because
cbse
class12
biology
zoology
neet
sec-a
answered
Nov 30, 2019
by
shalini86.s
1
answer
Let A = set of boys of XII class in some school. Let a R b, if and only if a and b use unfair means in the exam, \( a, b \in A\) Is R a transitive relation?
cbse
class12
modelpaper
2012
sec-b
q11
math
answered
Oct 25, 2019
by
Dadwalgaurav07
1
answer
Pollen grains that would easily germinate on stigma are formed to germinate invitro, only when 10-220ppm of boric acid is added. This suggests that
cbse
class12
biology
botany
neet
sec-a
answered
Oct 23, 2019
by
rahul.and420
1
answer
To test the quality of electric bulbs produced in a factory, two bulbs are randomly selected from a large sample without replacement. If either bulb is defective, the entire lot is rejected. Suppose a sample of 200 bulbs contains 5 defective bulbs. Find the probability that the sample will be rejected.
cbse
class12
modelpaper
2012
sec-b
q22
math
answered
Sep 18, 2019
by
addisutheking
1
answer
Find the volume of the tetrahedron formed by the four planes $x+y=0,y+z=0,z+x=0,x+y=1$
cbse
class12
ch10
asked
Jul 9, 2019
by
meena.clay6
1
answer
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