2nd Class

Time and Calendar

Time and Calendar Hours, Minutes and Seconds Hour, minute and second are the unit for the measurement of time 24 hours = 1 day; 1 hour= 60 minutes; 1 minute = 60 seconds; Hence, 1 hour\[=60\times 60=3600\,\sec onds\].

Example:

Convert 5 hours in seconds. (a) 18000 seconds (b) 19000 seconds (c) 21000 seconds (d) All the above Answer (a) Explanation: \[1\,hour=60\times 60=3600\,\sec onds\]. So\[5\,hour=5\times 3600\,\sec onds=18000\,Seconds\] Clocks Clocks are the devices that let us know of the times in a day. See the examples given below:

The small hand in a clock is for hour and the big hand is for the measurement of minute. Example: Hour hand of a clock is at 3 and more...

Catgeory: 2nd Class

Geometrical Figures

Geometrical Figures Line Let's see the lines given below:

Example:

Give the name of all slant lines from the figure given below.

(a) AD and BC (B) AB and BC (c) AB and AD (D) All the above (e) None of these Answer (a)

Example:

Which one of the following is correct about the line? (a) A straight line is measured by ruler. (b) A straight line cannot be measured by ruler. (c) A straight line is measured in grams. (d) All the above (e) None of these Answer (a). Note: We use ruler to measure a straight line. Angle more...

Catgeory: 2nd Class

Measurement

Measurement Measurement of Length There are various units for the measurement of the length. These are metre, centimetres, kilometres etc. The standard unit for the measurement of the length is metre. 1 centimetre = 10 millimetres 1 metre = 100 centimetres 1 kilometre = 1000 metres

Example:

A rope is 45 centimetres long. What will be the length of the rope in millimetres? (a) 450 millimetres (b) 4500 millimetres (c) 405 millimetres (d) All the above (e) None of these Answer (a) Explanation: 1cm = 10 millimetres, 45cm = 450 millimetres Conversion between Metre and Centimetre 1 metre \[=1\times 100=100\]centimetres 2 metres \[=2\times 100=200\]centimetres 100metres \[=100\times 100=10000\]centimetres

Example:

Convert 450 metres into centimetres (a) 45000 cm (b) 4500cm (c) 2550 cm (d) All more...

Catgeory: 2nd Class

Surrounding and Safety Rules

SURROUNDING AND SAFETY RULES

FUNDAMENTAL

We live in our house with our family members. A society is formed in this way. Nearby living people becomes our neighbor. Neighbors help each other.
Neighbors celebrate festivals and other rituals together.
There are many services which are available in the neighborhood such as post office, bank, police station, fire station, hospital, market, railway station, school etc.
There are many people who help us in different kind of works - chemist, green grocers, and black smiths, carpenter, tailor, Cobbler, plumber, electrician etc.
Post office is the place where we post letter. We drop letters in the letter box. They are located in every town, village and city. We send more...

Catgeory: 2nd Class

Living and Non-living things

LIVING AND NON-LIVING

FUNDAMENTALS

Living things are organisms that have life e.g. plants, animals, insects, birds, human beings, microorganisms etc.

Non- living things are things that don’t have life e.g. pen, bottle, door, computer, mobile etc.

Differences between living and non-living things.

more...

Catgeory: 2nd Class

The Plant KIngdom

THE PLANT KINGDOM

CHARACTERISTICS OF PLANTS

Plants are one of the oldest living organisms on the earth.
Plants are living organisms which need air, water and sunlight to survive.
Plants provide food to other living organisms.
Plants play a very vital role as they provide oxygen for living organisms on earth for their survival.
Plants gives us many things such as wood, medicines, paper, furniture etc.
Plants helps in keeping environment fresh and cool.
Plants are mainly of two types - terrestrial and aquatic.
Plants which grow on the land are called terrestrial plants, e.g. papaya tree, mango tree, neem tree etc.
Plants which grow in water more...

Catgeory: 2nd Class

The Animal Kingdom

THE ANIMAL KINGDOM

GENERAL CHARACTERISTICS

Animals move from one place to another in search of food, shelter and to themselves from the enemy.
Plants and animals both are living organisms. Animals depends upon plants for food animals are known as consumers and plants are called producer in a food chain.
Animals that can be tamed and kept at homes and farms are called domestic anima cow, goats, buffalo’s horse etc.
Uses: donkey is used for load carrying, oxen for cultivation, cow gives us milk etc.
The skin of some animals like snakes, crocodiles, camels etc. are used as leather.
Some animals like cats, dogs, rabbits and birds are kept at home are known animals.
Animals which live in forests are called wild animals. more...

Catgeory: 2nd Class

Human Body

HUMAN BODY

FUNDAMENTAL

Cells are the smallest unit of life. Our body is made up of cells.
Our body has a framework of bones called skeleton. It gives shape and support to the body.
There are various joints such as elbow joint, wrist joint, knee joint, ankle joint etc.
The sense organs - eyes, tongue, skin, ears and nose-help to protect the body.

Our eyes help us to see thing more...

Catgeory: 2nd Class

Our Environment

OUR ENVIRONMENT

FUNDAMENTAL

Environment includes everything, i.e. vegetation, water, microorganisms, soil, rocks, atmosphere, etc.
Our environment consists of both living and non-living things.eg. Atmosphere, sea, river, lakes, soil etc.
Atmosphere means the sphere of air surrounding the earth. Mainly, there are four sub- systems called spheres, they are land (lithosphere), water (hydrosphere), living things (biosphere) and air (atmosphere).
The atmosphere consists of four unique layers:

The troposphere (0-8 miles) The stratosphere (8-30 miles) The mesosphere (30-50 miles) The thermosphere (50-120 miles)

Atmosphere protects the life on the earth. Atmosphere has gases like nitrogen hydrogen, carbon dioxide, argon, helium and some more gases. It has 78% nitrogen, 21% oxygen and 1% other gases.
Oxygen is the most important gas more...

Catgeory: 2nd Class

Air, Water and Weather

AIR, WATER AND WEATHER

FUNDAMENTAL

Air is present in the environment. Air is a mixture of different gases like nitrogen, oxygen, carbon dioxide etc.
Air contains 78% nitrogen, 21% oxygen and remaining 1% other gases.
Living things need air to breathe. We must breathe in fresh and clean air.
Wind is the movement of air, there are mainly two types of wind - global wind and local wind.
Global winds are the dominant prevailing wind patterns that blow in a fairly, constant, steady direction across our earth.
Local winds are small scale wind of local origin caused by temperature difference. They can move up, down and horizontal. E.g. wind of mountain areas.

more...

Catgeory: 2nd Class

2nd Class

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