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Recent questions and answers in CBSE XII
Questions
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CBSE XII
CBSE XII
Math
Physics
Chemistry
Biology
If at high altitudes , birds become rare, plants likely to disappear are:
cbse
class12
biology
botany
neet
sec-a
answered
Jun 19
by
abhicjraj
1
answer
First code of every mRNA is
cbse
class12
biology
botany
neet
sec-a
answered
May 28
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
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
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
by
srivastavshivam359
1
answer
Which one is useful to remove oil stains in laundry?
cbse
class12
biology
zoology
neet
sec-a
answered
Apr 4
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
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
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
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
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
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
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
by
kharbans823
2
answers
Which one is related with steroids?
cbse
class12
biology
zoology
neet
sec-a
answered
Mar 17
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
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
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
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
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
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
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
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
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
The living organisms can be unexceptionally distinguished from the non living things on the basis of their ability for
cbse
class12
biology
botany
neet
sec-a
answered
Sep 9, 2019
by
hrs110101
4
answers
In cockroach, ootheca is formed by the secretion of
cbse
class12
biology
zoology
neet
sec-a
answered
Sep 1, 2019
by
gnaneshs2611
1
answer
Deserts, grasslands, forests and tundras are examples of
cbse
class12
biology
botany
neet
sec-a
answered
Aug 8, 2019
by
wasimaliali748
1
answer
First step in taxonomy is
cbse
class12
biology
botany
neet
sec-a
answered
Jul 28, 2019
by
rahana.ab
1
answer
New approach to conservation is the establishment of
cbse
class12
biology
botany
neet
sec-a
answered
Jul 23, 2019
by
shreyashnarade2002
1
answer
The sporophyte is the dominant phase in
cbse
class12
biology
botany
neet
sec-a
answered
Jul 22, 2019
by
amanullah2563
1
answer
find the equation of the normal to the curve y=x^3+2x^2 at x=0 find the coo
math
answered
Jul 20, 2019
by
noorlh
1
answer
From the point P(1, 2, 4 ) a perpendicular is drawn on the plane \( 2x+y-2z+3 = 0 \). Find the equation of the length and coordinates of the foot of the \( \bot \)
cbse
class12
modelpaper
2012
sec-c
q27
math
answered
Jul 20, 2019
by
vikashkumarpaswan858
1
answer
Exposed part of tooth is called
cbse
class12
biology
zoology
neet
sec-a
answered
Jul 14, 2019
by
suryawanshikishanrao
1
answer
P(A speaks truth is) = 4/5 . A coin is tossed. 'A' reports that a head appears. The probability that actually there was a head is.
cbse
class12
additionalproblem
kvquestionbank2012
ch13
q43
p43
math
answered
Jul 13, 2019
by
fad.vhora
1
answer
A speaks truth 8 times out of 10 times. A dice is tossed. He reports that it was 5. What is the probability that it was actually 5?
cbse
class12
modelpaper
2012
sec-b
q22
math
answered
Jul 13, 2019
by
fad.vhora
1
answer
A cylindrical metallic wire is stretched to increase its length by $5\%$. Calculate the percentage change resistance.
cbse
class12
physics
modelpaper
mock-test-series-2015
answered
Jul 9, 2019
by
jesanivar
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
answered
Jul 9, 2019
by
meena.clay6
1
answer
Given P(A) = 0.3, P(B) = 0.2, Find P(B/A) if A and B are mutually exclusive events.
cbse
class12
additionalproblem
kvquestionbank2012
ch13
q3
p41
math
answered
Jul 1, 2019
by
abhav31
5
answers
cbsc
class 12
biology
molecular basis of inheritance
sec-d
asked
Apr 30, 2019
by
priyanka.clay6
1
answer
Expand: AIDS,VD, IUT, AI, IVF, STD, MTP, IUD, ZIFT, GIFT, ART, ICSI, PID
cbsc
class 12
biology
reproductive health
sec-d
asked
Apr 24, 2019
by
priyanka.clay6
1
answer
What is STD? List out the various STD's. How is it transmitted? What are its symptoms? What are the complications the STD could lead to?
cbsc
class 12
biology
reproductive health
sec-d
asked
Apr 24, 2019
by
priyanka.clay6
1
answer
How do the natural, barriers, IUD's, Oral pills and Surgical methods help in Contraception? Explain.
cbsc
class 12
biology
reproductive health
sec-d
asked
Apr 24, 2019
by
priyanka.clay6
1
answer
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