MEDIUM
9th CBSE
IMPORTANT
Earn 100
What are the advantages of composite fish culture?
Important Questions on Model Test Paper (As Per the Latest Marking Scheme)
MEDIUM
9th CBSE
IMPORTANT
Explain the general ways of preventing infection.
MEDIUM
9th CBSE
IMPORTANT
Why is the atmosphere essential for life?
HARD
9th CBSE
IMPORTANT
Explain the formation of (i) sodium ion, and (ii) chloride ion, from their respective atoms giving the number of protons and number of electrons in each one of them. What is the reason for positive charge on a sodium ion and negative charge on a chloride ion?
MEDIUM
9th CBSE
IMPORTANT
Define the valency of an element. What valency will be shown by an element having atomic number ?
HARD
9th CBSE
IMPORTANT
What is the relation between the valency of an element and the number of valence electrons in its atoms. Explain with example.
EASY
9th CBSE
IMPORTANT
Define density. What is the SI unit of density.
EASY
9th CBSE
IMPORTANT
Define relative density. What is the SI unit of relative density?
EASY
9th CBSE
IMPORTANT
Define the term 'energy' of a body. What is the SI unit of energy?
