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Recent questions in CBSE XI
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CBSE XI
CBSE XI
Math
Physics
Chemistry
Biology
How many unpaired electrons are present in Pd (Z = 46) ?
cbse
class11
chemistry
ch2
structure-of-atom
asked
Jul 3, 2019
by
meena.clay6
1
answer
Which element does not have any neutron?
cbse
class11
chemistry
ch2
structure-of-atom
asked
Jul 3, 2019
by
meena.clay6
1
answer
Yellow light emitted from a sodium lamp has a wavelength $(\lambda)$ of 580 nm. Calculate thefrequency $(ν)$ and wave number of the yellow light.
cbse
class11
chemistry
ch2
structure-of-atom
asked
Jul 3, 2019
by
meena.clay6
0
answers
Brassica campestris Linn
class11
biology
sec-d
the living world
asked
Jul 2, 2019
by
swapnarajan1982
1
answer
A scientist has come across a plant which he feels is a new species. How will he go about its identification, classification and nomenclature?
class11
biology
sec-d
the living world
asked
Jul 2, 2019
by
swapnarajan1982
1
answer
What is meant by living? Give any four defining features of life forms.
class11
biology
sec-d
the living world
asked
Jul 2, 2019
by
swapnarajan1982
1
answer
What is the similarity and dissimilarity between „whole moong dhal‟ and „broken moong dhal‟ in terms of respiration and growth? Based on these parameters classify them as living or non living?
class11
biology
sec-c
the living world
asked
Jul 2, 2019
by
swapnarajan1982
1
answer
Do you consider a person in coma-living or dead?
class11
biology
sec-c
the living world
asked
Jul 2, 2019
by
swapnarajan1982
1
answer
Define: a) Genus b) Family c) Order
class11
biology
sec-c
the living world
asked
Jul 2, 2019
by
swapnarajan1982
1
answer
The number and kind of organism is not constant. How do you explain this statement?
class11
biology
sec-c
the living world
asked
Jul 2, 2019
by
swapnarajan1982
1
answer
Properties of cell organelles are not always found in the molecular constituents of cell organelles. Justify.
class11
biology
sec-c
the living world
asked
Jul 2, 2019
by
swapnarajan1982
1
answer
Monographs and manuals are taxonomic aids. How do they differ from each other? Name any two other taxonomic aids of those type.
class11
biology
sec-c
the living world
asked
Jul 2, 2019
by
swapnarajan1982
1
answer
Name the type of organisms , in which the use of two terms-growth and reproduction is not clear. Explain.
class11
biology
sec-c
the living world
asked
Jul 2, 2019
by
swapnarajan1982
1
answer
How are specimen preserved and pasted on a herbarium sheet?
class11
biology
sec-c
the living world
asked
Jul 2, 2019
by
swapnarajan1982
1
answer
Give the scientific names of a) Wheat b) Human beings c) House fly
class11
biology
sec-c
the living world
asked
Jul 2, 2019
by
swapnarajan1982
1
answer
Name the family and the order to which each of the following belongs: a) Mango b) Housefly c) Wheat
class11
biology
sec-c
the living world
asked
Jul 2, 2019
by
swapnarajan1982
1
answer
What is an order in taxonomic hierarchy? Explain with an example from each of the plant and animal kingdom.
class11
biology
sec-c
the living world
asked
Jul 2, 2019
by
swapnarajan1982
1
answer
What are taxonomic aids? Mention some of the taxonomic aids for identification.
class11
biology
sec-c
the living world
asked
Jul 2, 2019
by
swapnarajan1982
1
answer
Volt is equivalent to
cbse11
physics
ch1
units-and-measurement
asked
Jul 2, 2019
by
meena.clay6
1
answer
If $x=at+bt^2$ where x is distance in km and t is time , then unit of b is
cbse11
physics
ch1
units-and-measurement
asked
Jul 2, 2019
by
meena.clay6
1
answer
The nearest star to our solar system is 4.29 light years away. How much is this distance in terms of parsecs?
cbse11
physics
ch1
units-and-measurement
asked
Jul 2, 2019
by
meena.clay6
1
answer
Which is different from others by units
cbse11
physics
ch1
units-and-measurement
asked
Jul 2, 2019
by
meena.clay6
1
answer
In a certain system of units, 1 unit of time is 5 seconds, 1 unit of mass is 20 kg and 1 unit of length is 10 m. In this system one unit of length is 10m. In this system of power will correspond to
cbse11
physics
ch1
units-and-measurement
asked
Jul 2, 2019
by
meena.clay6
1
answer
The SI unit of the inductance, the Henry cannot be written as
cbse11
physics
ch1
units-and-measurement
asked
Jul 2, 2019
by
meena.clay6
1
answer
The error in measuring radius of sphere is $0.2\%$. What is permissible error in it volume
cbse11
physics
ch1
units-and-measurement
asked
Jul 1, 2019
by
meena.clay6
1
answer
The dimensions of Reynolds's number are
cbse11
physics
ch1
units-and-measurement
asked
Jul 1, 2019
by
meena.clay6
1
answer
Compare the wavelengths for the first three lines in the Balmer series with those which arise from similar
cbse
class11
chemistry
ch2
structure-of-atom
asked
Jun 28, 2019
by
meena.clay6
1
answer
A 1 MeV proton is sent against a gold leaf (Z = 79). Calculate the distance of closest approach for head on collision.
cbse
class11
chemistry
ch2
structure-of-atom
asked
Jun 28, 2019
by
meena.clay6
1
answer
What details does an herbarium give us?
class11
biology
sec-b
the living world
asked
Jun 27, 2019
by
swapnarajan1982
1
answer
What is a taxonomic key? How is it helpful in identification and classification of an organism?
class11
biology
sec-b
the living world
asked
Jun 27, 2019
by
swapnarajan1982
1
answer
“Botanical gardens are Living Herbaria”. Comment.
class11
biology
sec-b
the living world
asked
Jun 27, 2019
by
swapnarajan1982
1
answer
What is the role of a museum in studying systematics?
class11
biology
sec-b
the living world
asked
Jun 27, 2019
by
swapnarajan1982
0
answers
Differentiate between a species and a taxon.
class11
biology
sec-b
the living world
asked
Jun 27, 2019
by
swapnarajan1982
1
answer
Give the role of botanical gardens.
class11
biology
sec-b
the living world
asked
Jun 27, 2019
by
swapnarajan1982
0
answers
Give the role of botanical gardens.
class11
biology
sec-b
the living world
asked
Jun 27, 2019
by
swapnarajan1982
1
answer
What is a taxon? Illustrate the hierarchy with an example.
class11
biology
sec-b
the living world
asked
Jun 27, 2019
by
swapnarajan1982
1
answer
Atomic number of an element is equal to the number of
cbse
class11
chemistry
ch2
structure-of-atom
asked
Jun 27, 2019
by
meena.clay6
1
answer
The angular momentum of electrons in d orbital is equal to
cbse
class11
chemistry
ch2
structure-of-atom
asked
Jun 27, 2019
by
meena.clay6
1
answer
Write 3 points of difference between electromagnetic waves and matter waves
cbse
class11
chemistry
ch2
structure-of-atom
asked
Jun 27, 2019
by
meena.clay6
1
answer
Calculate the total number of angular nodes and radial nodes present in 30 orbitals
cbse
class11
chemistry
ch2
structure-of-atom
asked
Jun 27, 2019
by
meena.clay6
1
answer
An element with mass number 81 contains $31.7 \%$ more neutrons as compared to protons. Assign the atomic symbol.
cbse
class11
chemistry
ch2
structure-of-atom
asked
Jun 26, 2019
by
meena.clay6
1
answer
The dimension of electrical resistance is
cbse11
physics
ch1
units-and-measurement
asked
Jun 26, 2019
by
meena.clay6
1
answer
The time period (T) depends upon the density 'd' radius 'r' and surface tension S obtain the formats for T by dimensional method
cbse11
physics
ch1
units-and-measurement
asked
Jun 26, 2019
by
meena.clay6
1
answer
Convert 1 newton into dynes
cbse11
physics
ch1
units-and-measurement
asked
Jun 25, 2019
by
meena.clay6
1
answer
The percentage errors in measurement of mass and speed are $2 \%$ and $3\%$. The error in K.E obtained is
cbse11
physics
ch1
units-and-measurement
asked
Jun 25, 2019
by
meena.clay6
1
answer
Unit of modulus of rigidity are
cbse11
physics
ch1
units-and-measurement
asked
Jun 25, 2019
by
meena.clay6
1
answer
In a vernier callipers one main scale division is x cm and n division of vernier scale coincides with $(n-1) $ divisions of main scale least in cm is
cbse11
physics
ch1
units-and-measurement
asked
Jun 25, 2019
by
meena.clay6
1
answer
If force acceleration and time are taken as fundamental quantities , then dimension of length will be
cbse11
physics
ch1
units-and-measurement
asked
Jun 25, 2019
by
meena.clay6
1
answer
The error in measurement of radius sphere is $0.3\%$ What is the permission error in its surface area
cbse11
physics
ch1
units-and-measurement
asked
Jun 25, 2019
by
meena.clay6
1
answer
Differentiate between taxonomy and systematics.
class11
biology
sec-b
the living world
asked
Jun 24, 2019
by
swapnarajan1982
1
answer
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