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CBSE->Std 10 Questions

Total Questions 2595
How are minerals formed in igneous and metamorphic rocks ?
The absolute refractive indices of glass and water are 4/3 and 3/2 respectively. If the speed of light in glass is 2 x 10^8 m/s , calculate the speed of light in 1) vacuum 2) water
What is the significance of reproductive health in society? Name any two areas related to reproductive health which have improved over the past 50 years in our country.
what is covalent bond ?
List two criteria of measuring the biodiversity of an area.
The linear magnification produced by a spherical mirror is –1. Analysing this value state the (i) type of mirror and (ii) position of the object with respect to the pole of the mirror. Draw ray diagram to justify your answer
Why do mice whose tails were surgically removed just after birth for generations, continue to produce mice with tails ?
Out of the three elements P, Q and R having atomic numbers 11, 17 and 19 respectively which two elements will show similar properties and why ?
what are noble gases ?
My syllabus is CBSE and we study a NCERT textbook. While i was writing a test on Biology, i noticed that most of the questions asked was not from our text book or syllabus. Due to this reason i am not able to answer questions. Can you tell me why this happens?
why can't carnivores be self dependent and have to depend on herbivores
define the terms: genetic drift geographical isolation natural selection speciation
1.find the middle term of an ap with 17 terms whose 5th term is 23 and the common difference is -2 2.if p(x,y) is any point on the line joining the points A(a,0)and B(0,b) , then show that x/a +y/b=1
what will happen if hydrogen molecule forms ionic bond,i.e, one hydrogen loses one electron and other gains an electron
Why population is a dynamic phenomenon?
Explain double fertilisation?
what is copper-T ?why it is used ? is it effective ?if yes what are they ?
liberal means
what do you mean by catalyst
properties of covalent bond