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CBSE->Std 10 Questions

Total Questions 2595
How can we find the atomic mass number of an element if the atomic number is given?
What are the defects of Mendeleev's Periodic table?
What is meant by Cloud Computing?
Find the ratio in which the line segment joining A(6,4) and B(1,-7) is divided by the x axis.
what is the importance of DNA copying in reproduction.explain ?
what is the significance of asexual reproduction ?
how is binary fission different from multiple fission ?
why sweet potato and potato should be called analogous organ?
why is the wing of bird and wing of insect called an analogous organ?
in terms of evolution what is the significance of homology between a human hand and wing of bird ?
consider the following food chain: grass -> mice -> snakes -> peacocks. if in this chain 100J of energy is available at producer level.calculate the energy transferred to the peacock as food ?
explain how sexual reproduction give rise to more viable variations compared to asexual reproduction? how does this affect the evolution of organisms?
what is the evidence for origin of life form in animate organ ?
how are the areas of study evolution and classification inter related ?
give an example of characteristics being used to determine how close 2 species are interms of evolution?
what are the various factors that would lead to the rise of a new species ?
why are traits acquired during the life line of an individual or organism not inheritant ?
D,E and F are respectively mid-points of BC,CA,AB of triangle ABC.Show that : i)BDEF is a parallelogram ii)ar{DEF}=1/4ar[ABC] iii)ar{BDEF}=1/2ar{ABC}
what are the different ways in which individuals with a particular trait may increase in a population ?
with respect to air refractive index of kerosene 1.44 and for diamond 2.42. calculate the refractive index of diamond with respect to kerosene ?