6th Class

Motion and Measurement of Distances   Physical Quantities The quantities like length, mass, time etc. that can be measured are called physical quantities.   Measurement: It is the comparison of an unknown quantity with a certain fixed quantity of the same kind.   Unit of Measurement: A unit of measurement is a definite magnitude of a physical quantity. For example metre, centimetre, kilometre etc are units of length.    Standard Unit: For the sake of uniformity, scientists all over the world have accepted a system of units called SI system. In the SI System  

• The unit of length is metre (m).
• The unit of mass is kilogram (kg).
• The unit of time is second (s).
• Other system used are FPS, CGS and MKS.

  Multiples and Submultiples of Units   Length 1 centimetre (cm) =10 millimetres 1 decimetre (dm) more...

Electricity and Magnets   Electricity Electricity is a form of energy called electrical energy. We can convert electrical energy into various other forms of energies easily.   Electric Circuit The path through which electric current can flow is known as electric circuit. A simple electric circuit is made up of a bulb, wire and an electric cell. An electric cell has two terminals: a positive terminal and a negative terminal. A wire is connected from positive terminal to negative terminal of the cell and the bulb is connected to the wire so that current can flow through bulb.   Closed Circuit: When there is no gap in an electric circuit or the normal path of current has not been interrupted, the circuit is known as closed or more...

Environment   Water Water is an abiotic component of the environment which is essential for the survival of life on the earth. It is present on the earth in all three states solid, liquid and gas. It covers about 71% of the earth surface.   Importance of Water It is the water which makes life possible on earth. Without water existence of life was not possible on the earth. Therefore, water is very important for all of us.  

• Water is essential for the survival of life.
• Water provides shelter to the large variety of plants and animals.
• Plants use water for preparing food.
• Water is essential for germination of seeds and their growth.

  Uses of Water  

• Water is used for different purposes in our day to day life.
• Water is used for drinking, bathing, more...

Reasoning and Aptitude   Reasoning and logic skills are an integral part of subjects like Mathematics. In this chapter, we will learn various problems related to reasoning and aptitude.   Problems Based on Missing Numbers In these types of problems, we find out a missing number from a given set of numbers, which is appropriate and follow a certain pattern.  

• Example:

Complete the series given below: 4, 10, 26, 72, 208, 614? (a) 1815                       (b) 1820        (c) 1830                       (d) 1836 (e) None of these   Answer (c) Explanation: Here the pattern is given below: more...

  Compositions   Letters   Letters are mainly of three types:   Personal Letter: Those letters which are written to our relatives friends and to known persons. Business Letter: Those letters which are written to business mass traders and business firms. Official Letters: Those letters which are written to government officers such as postmaster, principal, etc.   A letter consists of six parts which are shown below as example. 1.            Heading 2.            The salutation or greeting 3.            The body 4.            The subscription 5.            Signature 6.            Address   A.         You are Kavi Naik residing at A-39, Mohan Nagar, Allahabad. You with your more...

  Essay   Disaster Management Management is directly related to planning about future means, what will be the alternate options if your present plan does not work. Similarly managing the situation for disaster. Disasters are generally very destructive in nature. It results huge loss to life and necessary commodities. If it is a case of flood the basic articles like food, matches, drinking water, medicines become big issues because these things get washed away with the flood. Crops, animals and houses also suffer a big loss. To come to normal situation it takes several years. Earthquake or war with a country pushes the country a decade behind. Earthquake destroys the buildings, roads, powder plants and loss to life is large in numbers. People overcome from financial loss but they can not overcome from emotional more...

  Paragraphs   A paragraph is a number of sentences grouped together and relating to one topic, or a group of related sentences that develop a single point.   A Car Accident It is the mad craze for speed that is responsible for many motor accidents. Only last year I witnessed what might have been a fatal accident on the Kashmir road. I was motoring down from Srinagar, and as I was nearing Kohala. I came upon the wreckage of two cars on the road. The smash had been caused, by a car coming down, which swept round a sharp corner at forty miles an hour and crashed into a car coming up. Happily no one was killed; but several were badly injured, and the two cars were wrecked. To drive at such more...

  Judging Story Logic   In this chapter, we will learn to make a logical story from the given sentences or incidents in jumbled form. First two are solved as an example for you.   ·                     Example   1.            Arrange P, Q, R and S in order to make a sensible story:   P: He asked her what was wrong and she replied, ?I wanted to buy a red rose for my mother. But I only have seventy-five cents, and a rose costs two dollars.? The man smiled and said, ?Come on in with me. I'll buy you a rose.?   Q: A man stopped at a flower shop to order some flowers to be wired to more...

  Judging Logic of Action   In this topic, we will learn to arrange sentences, actions in a logical order.   ·                     Example 1   Arrange A, B, C and D in logical order to find out the correct order of actions:   A: Ernest Rutherford was the son of a Scot emigrant in New Zealand. His parents had 12 children, of whom Ernest was the fourth. His education was in a state primary school from the age of 15 where children could get grants of scholarships to secondary schools and to the universities.   B: Rutherford had no intention of following an academic career. He was not a bookworm. He was good in anything rough-and-tumble and a keen football player. But he was good at Latin and he had a passion for 'music and a mechanical more...

  Judging Completeness of Process   ·                     Example 1   Below, you can see a set of instructions for using a pipette to measure a required amount of water. Complete the following paragraph which describes how a pipette is used.   1.            Take a pipette and dip the nozzle into water in a vessel.   2.            Suck out the air through the other end.   3.            When the water rises to the mark on the pipette, cover its upper end and take the pipette out.   4.            Then empty the water in the pipette into a breaker. A pipette more...