English Medium कक्षा ९ - CBSE Question Bank Solutions

Give an illustrated account of nucleus.

What are the genes?

What is the location of following in the cell:

Chromatin

What is soil erosion? Explain means of preventing it.

What is weathering? Elucidate in the various types of weathering.

How do organisms contribute in the formation of soil?

What is soil? How does it form?

Give various sources and harmful effects of soil pollution.

Define soil erosion. Give its causes, effects and preventive measures.

Mention briefly the role of decomposers of cycling of materials.

What is the maximum number of electrons which can be accommodated in the K shell of an atom?

What is the maximum number of electrons which can be accommodated in the L shell of an atom?

What is the maximum number of electrons an M shell of the atom can accommodate?

What is the maximum number of electrons that can go into the N shell of an atom?

What is the maximum number of electrons which can be accommodated in the :
(a) innermost shell of an atom?
(b) outermost shell of an atom?

What is the Electronic Configuration of a Hydrogen Atom?

State the number of electrons present in the outermost shell of the atoms of the following elements :(i) Neon 
(ii) Chlorine

Which shell of an atom can accommodate a maximum of :
(a) 8 electrons ?
(b) 32 electrons ?

Name the shell of an atom which can accommodate a maximum of :
(a) 2 electrons ?
(b) 18 electrons ?

What do you understand by the term "electronic configuration" of an element? Write down the electronic configuration of oxygen (At. No. = 8).