CBSE Class 9 - CH4 - Structure of Atom (Worksheet)

Structure of Atom

Carbon-Atom
credits:openclipart

Worksheet (Fill in the blanks)

1.  Atoms are made up of __________, ___________ and __________.

2. ________ rays are negatively charged.

3. The fundamental particle not present in hydrogen atom is __________.

4. Anode rays are also called ___________.

5. Rutherford's scattering experiment is related to to the size of ____________.

CBSE Class6/7/8 - PUNCTUATION (English Grammar)

PUNCTUATION

Rewrite the following sentences after inserting the necessary punctuation marks and use the capital letters, wherever required.

1. will you help me.
2. delhi the capital of india stands on the banks of the river yamuna.
3. mrs jindal knows english hindi urdu bengali tamil and punjabi
4. how beautiful the sky is
5. mother should i stay or leave
6. where do you want to go asked meera
7. she had a banana an apple a sandwich and a cup of coffee for breakfast
8. pardon me o god

CBSE Class 9 - English (Comm.) Workbook - Prepositions (Unit 8)

PREPOSITIONS

1. Read the following passage on New Zealand.

New Zealand is a Mecca for nature lovers. Throughout most of New Zealand's geological history, it was a bird's paradise. The islands were once part of the southern super - continent Gondwana from which they broke off around 80 million years ago before mammals had evolved and spread.

(courtesy : Terra Green Sept 2008 issue 06)

Answer:

The underlined words express a relationship usually of space or time between the words with which they stand. Such 'Positional' words which are used before nouns (pre-position) are called ___prepositions_____

CBSE Class 6/7/8 - English Grammar - Degrees of Adjectives

Degrees of Adjectives 

Q: Fill in the blanks with correct degree of adjective:

1. Mohan is _________ than Sohan (wise).
2. This bag is too big; do you have a ________ one? (small)
3. The pears are __________ than the plums. (hard)
4. Mohan is the _________ of the two boys. (tall)
5. Chinese is ___________ than English. (difficult)
6. Saina is one of the ________ badminton player in the world. (good)
7. This is the ___________ painting in the museum. (valuable)

CBSE Class 8 - Science - CH 18 - POLLUTION OF AIR AND WATER

POLLUTION OF AIR AND WATER

NCERT Solution, Q & A

Q1: What are the different ways in which water gets contaminated?

Answer: Water gets contaminated in the following ways:

1. Various industrial units dispose off the chemicals in rivers. These chemicals are harmful and poisonous and contaminate water.
2. Water gets contaminated when sewage is disposed off (without any treatment) in rivers.
3. Ground water gets contaminated by harmful insectisides and pestisides sprayed by farmers and it becomes unfit for drinking.

Q2: At an individual level, how can you help reduce air pollution?

CBSE Class 9 - Science - CH 4 - STRUCTURE OF THE ATOM

STRUCTURE OF THE ATOM

Bohr Model

NCERT Solutions, Q & A

Q1(CBSE 2011): Name the fundamental particle not present in the nucleus of hydrogen atom

Answer: Neutron

Q2: Who discovered electrons?

Answer: J.J. Thomson


Q3: Who discovered protons?

Answer: Goldstein


Q4(CBSE 2011): Who discovered neutrons?

CBSE Class 9 - Economics - Ch3 - Poverty As A Challenge

Poverty As A Challenge

Slum in Mumbai
credits: Marcus Fornell at Flickr

MCQs

Q1: Every _________ person in India is poor

(a) third
(b) fourth
(c) fifth
(d) tenth


Q2(CBSE 2011): In which of the following countries did poverty actually rise from 1981 to 2001?

(a) Sub-Saharan Africa
(b) India
(c) China
(d) Russia

CBSE Class7/8/9/10 - English Grammar (Reported Speech)

English Grammar (Reported Speech)

Q: Change the following into reported speech.

1. She asked, “Is there a shopping center near here?”
2. He says, “I am doing my duty.”
3. She said to me, "I am a good dancer."
4. Mohan said to me, "I clean the black shoes."
5. She said, "I went to the cinema yesterday."
6. She said, "I am not hungry now."
7. The owner said to the servant, “Will you come tomorrow?”

CBSE Class 7 - Maths - Comparing Quantities (NCERT Ex 8.3) - Profit and Loss and Simple Interest

Comparing Quantities

Profit & Loss and Simple Interest

Important points
Simple Interest
1. C.P. = Cost Price (Amount at which goods are purchased)
2. Sales Tax, VAT, cartage etc.are included in cost price.
3. S.P. = Selling Price (Amount at which goods are sold)
4. If SP > CP then it is Profit or Gain. Profit = SP - CP
5. If CP > SP then it is Loss. Loss = CP - SP
6. Profit of Loss per cent is always calculated on the cost price.

CBSE Class 10 - Science - CH 15 - Our Environment (Worksheet)

Our Environment (Worksheet)

ozone layer protects from harmful UV
credits:openclipart

Fill in the blanks

1. Our environment has four components: ________, _________, __________ and ____________.

2. Abnormal increase of the temperature in the environment due to the continuous accumulation of gaseous pollutants is known as __________ _____________.

3. An ecosystem consists of ________components comprising of living organisms and ________ components comprising of physical factors like temperature, rainfall, wind, soil and minerals.

4. __________ is one of the green house gas. It is used as solvent, refrigerants, aerosol spray propellants and in foam packaging.