8th grade chemistry final test sem. 2

Please answer the following question briefly
1. What is meant by fossil fuel?
2. what is cracking?
3. please mention the use of fossil fuel?
4. what are the problems we face about fossil fuels?
5. what is the solution?
6. what are the characteristics of homologous series compound?
7. what are the chemical properties of alkane?

7th grade chemistry final test sem. 2

Please answer the following questions briefly.
1. what is atom?
2. What is meant by nucleon, proton and neutron?
3. what is isotope?
4. Please define Noble gas!
5. why do atoms form ions?
6. what is the difference of ionic bonding and covalent bonding?
7. please give an example for ionic bonding and covalent bonding

7th grade physics final test

Please answer the following questions briefly.

1. what are the types of energy that you know?
2. what is the meaning of conservation of energy?
3. what is work?
4. Please give examples that describe work?
5.. what is meant by conduction,.convection and radiaton?
6. please give example that describe conduction?
7. please give example that describe radiation

Physics 8th grade final test sem.2

Please answer the following questions briefly

1. what is meant by neutral wire, live wire and earth wire?
2. what is the main function of circuit breaker?
3. what are the hazards of using electricity?
4. why do we need double insulation?
5. What are the properties of magnet?
6. how to do magnetic induction?
7. how to do magnetisation by using electricity?
8.what are the uses of magnet in daily life (3 answers)