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CBSE->Std 9 Questions

Total Questions 1962
pqrs is a parellelogram . e is point on pq such that qe =2pe f is a point on rs such that you a2rf = sf show that perf is a parellelogram
the floor of a rectangular hole has perimeter 250 metre if the cost of painting the 4 walls @ of 10/m sq. is 15000. find height of wall ??
what is meant by marginalization?
what do you mean by scabies?
A solid weighs 80 gm in air,64 gm in water.Calculate the relative density of solid when kept in water.Also , state the object would float or sink.
An iron ball of density 7.8 gram/cm^3 and volume 200 cm^3 is totally immersed in water.Calculate the upthrust on it.
Name any two substances whose density cannot be measured accurately.
what is Denitrification?
what is nitrate assimilation?
Explain the major steps in agricultural practices?
Explain nitrogen cycle with a help of a neat diagram
what is pathogens?
being a student, how can you contribute in keeping the environment clean?
what is nitrification?
what is nitrate assimilation?
what is ammonification?
what is nitrogen fixation?
Explain the formation of curd from milk.
why do the food stored in the refrigerator remain preserved?
what is pasteurization?