Chapter No. 6 ACIDS, BASES/ALKALIS AND SALTS

ACIDS, BASES/ALKALIS AND SALTS: You have already read that a large number of compounds can be made by the combination of various elements. More than three million compounds are known to the scientists. It is practically impossible for anyone to learn about each of these compounds. Therefore, all these compounds are divided into different groups […]

Chapter No. 5 CHEMICAL REACTIONS

CHEMICAL REACTIONS: We have already learnt about elements and compounds which are the examples of pure matter. The substances such as hydrogen (H), oxygen (O) etc. are the elements while 2 2 water (HO), carbon dioxide (CO), etc., are the compounds. It is our daily observation 2 2 that water can be changed into ice. […]

Chapter No. 4 POLLUTANTS AND THEIR EFFECTS ON ENVIRONMENT

POLLUTANTS : The environment we live in is not as clean as it should be. Various natural and human activities contaminate it with harmful substances. Dust storms, rotting of vegetation, volcanic eruption, etc., are the natural phenomena which release dust particles and poisonous gases in the environment. On the other hand, burning of fuels in […]

Chapter No. 3 BIOTECHNOLOGY

Biotechnology: Application of knowledge in the areas like engineering and medicines, etc., is called technology. The technology in which living things are used in different ways to help and benefit human beings is called biotechnology. Microorganisms are used in making bread, yogurt, cheese, vinegar and several medicines. Fermentation, tissue culture and genetic engineering, etc., are […]

Chapter No. 2 CELL DIVISION

CELL DIVISION: It is our common observation that living things grow and increase in size. It is also observed that offspring resemble their parents. We have learnt that all the living things are made up of cells. Hence, more and more cells are needed for growth and development of living things. Where do new cells […]

Chapter No. 1 HUMAN ORGAN SYSTEMS

HUMAN ORGAN SYSTEMS: Nervous System Whenever a person gets injury on his foot while walking, he feels pain and his hand immediately reaches the injured site. Who asked the hand to reach the site? In fact, there is an organ system in our body which carries messages form one part of the body to another […]

Science Book Papers Test 12

Student’s Name:____________Admission No.______Roll No._____Section:______ Paper: Science Book Papers       Class: 8                     Time Allowed:    One Hour                           Marks: 100  Checked by:_______________ Rechecked by:_____________ Sign Invigilator:_____________ Q1. Circle the correct answer.  (10) Choose the […]

Science Book Papers Test 11

Student’s Name:____________Admission No.______Roll No._____Section:______ Paper: Science Book Papers       Class: 8                     Time Allowed:    One Hour                           Marks: 25  Checked by:_______________ Rechecked by:_____________ Sign Invigilator:_____________ Q1. Circle the correct answer.  (10) Choose the […]

Science Book Papers Test 10

Student’s Name:____________Admission No.______Roll No._____Section:______ Paper: Science Book Papers       Class: 8                     Time Allowed:    One Hour                           Marks: 25  Checked by:_______________ Rechecked by:_____________ Sign Invigilator:_____________ Q1. Circle the correct answer.  (10) Choose the […]

Science Book Papers Test 9

Student’s Name:____________Admission No.______Roll No._____Section:______ Paper: Science Book Papers       Class: 8                     Time Allowed:    One Hour                           Marks: 25  Checked by:_______________ Rechecked by:_____________ Sign Invigilator:_____________ Q1. Circle the correct answer.  (10) Choose the […]

Science Book Papers Test 8

Student’s Name:____________Admission No.______Roll No._____Section:______ Paper: Science Book Papers       Class: 8                     Time Allowed:    One Hour                           Marks: 25  Checked by:_______________ Rechecked by:_____________ Sign Invigilator:_____________ Q1. Circle the correct answer.  (10) Choose the […]

Science Book Papers Test 7

Student’s Name:____________Admission No.______Roll No._____Section:______ Paper: Science Book Papers       Class: 8                     Time Allowed:    One Hour                           Marks: 25  Checked by:_______________ Rechecked by:_____________ Sign Invigilator:_____________ Q1. Circle the correct answer.  (10) Choose the […]