1st Class

  TIME AND CALENDAR   1.    Concept of Time A day is divided into hours. An hour is divided into minutes and a minute is divided into seconds. See the following examples: For example, Leesa reaches school on 8 O'clock everyday. Here 8 O'clock is the time.   Hours, Minutes and Seconds Hours, minutes and seconds are units for the measurement of time. For example, we can say [2] hours; [2] minutes; [2] seconds.   Now just remember: [24] hours = [1] day          [1] hour= [60] minutes [1] minute = [60] seconds Hence [1] more...

  MONEY   Concept of Money We all are familiar with Money. In India or anywhere in the world money is available in the form of coins and notes. We pay money while purchasing any things and receive money by selling goods. Money in India is counted in terms of paise and rupees.   Rupee and Paise   Let's remember the following:   100 paise =     50 paise =   25 paise = 20 paise = more...

  MEASUREMENT   Measurement                              Measurement means determining the size, length, distance, height etc. of objects, place etc. The kilometre, metre, centimetre, inches and foot are the units of distance and length. While kilometre and metre are used for long and average distances, and length, centimetre, inches and foot are used to measure short distances.   What is Length and Breadth?                                          Length is the longer dimension of an object, while breadth is the dimension from side to side. Let's see the picture given below:                                             Look at the following: [1] kilometer = [1000] meters [1] meter = [100] centimeters.   Therefore, [2] meters = two [100] centimeters [3] meters = three more...

  GEOMETRICAL SHAPES   Geometrical Shapes In this chapter, we will know about the basic geometrical shapes, which we often see around us.   Line A line is a collection of points. The lines may be straight or curved. See the picture of lines given below: 1. Straight lines   2. Curved lines   Angles When two lines meet at a point, an angle is formed. See the following figures: (i)                        (ii) more...

 APPLIED MATHEMATICS   In this chapter, we will apply our mathematical knowledge to solve various problems. Some of these problems, along with their solutions are given below.  

•          Example:

How many circles are there in the figure? (a) 10                                                                (b) 12           (c) 13                                                                (d) 14 (e) None of these Answer (a) Explanation: Clearly in the figure, number of circles are \[\text{ }\!\!|\!\!\text{ }\,\,\text{ }\!\!|\!\!\text{ }\,\,\text{ }\!\!|\!\!\text{ }\,\,|\,\,|\,\,\text{ }\!\!|\!\!\text{ }\,\,\text{ }\!\!|\!\!\text{ }\,\,\text{ }\!\!|\!\!\text{ }\,\,|\,\,|\,=10\] So, correct option is more...

  Introduction to Computer   Introduction A computer is a machine, which manipulates data according to a list of instructions. We use computers for so many things, like playing video games, solving mathematical problems, drawing pictures, watching movies, listening to music, using internet e-mailing, etc.   The device by which we type the letters, give commands to the computer is an input device called CPU (Central Processing Unit). A part of a computer performs its internal task and computers display information through output devices. Therefore, a computer has three basic parts, Input, CPU and Output.   Few important features of a computer are:   v  It is a machine. v  It works on electricity. v  It makes more...

  Main Parts of Computer   Introduction Like we human beings have our body parts to do different task, a computer also has parts to perform different tasks.   There are four main parts of a computer. They are:   1. Monitor 2. Mouse 3. CPU 4. Keyboard Monitor   v  A monitor looks like a TV Screen. v  It displays pictures, text, movies etc on screen. v  It is also called Visual Display Unit (VDU). v  It displays information generated by computer. Mouse v  Mouse of a computer is a pointing device which looks more...

  Computer Components   Introduction Computer components are the devices which help computer to work properly. Computer Devices can be classified into following four parts:

Input Devices

2. Storage Devices 3. Processor 4. Output Devices       Input Devices Input devices allow the user to enter information into the system. Some input devices are: Mouse Mouse is a pointing device. It has two click buttons and one scroll wheel. It is used to manipulate object on a computer screen.       Keyboard Keyboard is a set of keys that enables you to enter data into a computer.     Joystick Joystick is a control device that enables a user more...

  How to Operate a Computer   Introduction Computer is an electronic device. It requires electricity to work, therefore, it should be connected to an electric plug. The computer should be properly switched ON and OFF, otherwise, the sensitive components of a computer may get damaged. Let us learn the correct -way to start and shut down a computer.   Switching on the computer The following is the correct procedure in order to switch ON the computer.                  1.               Switch ON the main power switch.                    2.               Press the ON button on the UPS of the computer. more...

  What Can Computer Do?   Introduction Computer is a machine which can perform many functions to simplify the work of human beings. The use of computer in many fields is increasing continuously.   Uses of a computer                     1.            It can help you in drawing and painting.                         2.            A computer can play music.                         3.            A computer helps you to type a document.               more...