CBSE Class 9 FAQs

the electrons present in it has very less mass as compared to that of proton and hence it is not considered while calculation Atomic mass.

Mass of a Electron = (1/1849) times of proton 

So The mass is protons and neutrons present in a atom is only considered as the mass of an atom 

Atomic mass = mass of neutron+ mass of proton.

Sound is an energy

Sound propagate(means aage badna) in wave form 

Wave form means aapne kabhi patther fenka hai taalaab main

After throwing stones you can see circular wave 

When you want to walk you need a medium which is called land 

In such a way to propagate sound they need air , water and land which is called medium

Islia moon per air no hone ki wajah se we are not be able to heard sound on moon

Habitat=place where we live 

Mostly two types

aquatic=aqua meansWATER=ocean,pond lake, rivers etc

Territorial= means Land=forests, desert mountain,bank of the river etc

There are fifteen delicious

yes sure

It's not necessary to switch board,just let her complete board without any confusion and prepare her basic concepts

Mam it's based on your child interest and his ability to catch up the subject .So both are great as ecommerce leads to banking or private sector and science as u already know leads to engineering,scientist,teachers etc..

NO ONE IS BAD.ITS DEPENDS ON YOUR ABILITY TO COPE UP WIT NEW CONCEPTS THATS MATTER THE MOST AS BOTH OF ALLEN AND AAKASH ARE BEST AT THEIR OWN LEVELS.

To make your concepts stronger and life long you must have to relate yourself with the life examples.You have to relate yourself with the concept by taking practical examples.So this will make your concepts even deeper and stronger.

you can take guidance of teacher to improve in this topics.

Science is a practical and theoretical knowledge.when you will be able to correlate all your books concept with your surroundings object then there will be not necessary to muggup all formula and concept.and will be strong in those sections automatically Your marks will be improve

Yes please specify your question.

Yes we have periodic batches for maths subject . 

1000 rs per subject