Unit 7 Physical and Chemical Changes and Processes

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Class 7 General Science, Chapter # 7, online quiz

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Unit 7 Physical and Chemical Changes and Processes

Online test preparation for ETEA, NTS, KPPSC, PPSC, FPSC, or any type of competitive Exams as well as for kpk teaching posts

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1. ____ doesn’t always stay the same.

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2. ____ is a property that is measurable and whose value describes a state of a physical system.

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3. The properties which are related with the chemical reactions occurring in a substance are called:  ____ 

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4. Changes of processes, that can be reversed are called:

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5. Changes of processes, that cannot be reversed are called:

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6. Change in which only physical properties of a substance change and no new substance is formed is called:

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7. Change in which chemical properties of a substance change and new substance is formed is called:

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8. Most of the physical changes are ____

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9. Most of the chemical changes are ____

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10. The solutes and solvents in the solutions can be easily separated by:

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11. ____ are found in coal, crude oil and natural gas.

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12. ____ are organic compounds that are made up of only hydrogen and carbon atoms.

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13.  Hydrocarbons burn in air producing carbon dioxide, water and large amounts of energy.

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14. Complete the formula: Natural gas + _____ → carbon dioxide + Water + energy

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15. The chemical process that gives out heat is called:

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16. Plant require a number of soil nutrients like ____ for their growth

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17. Natural fertilizers include manures, ____

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18. ____ are natural or artificial substances composed of the chemical elements.

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19. The biggest problem caused by chemical fertilizers is ____ contamination.

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20. ____ contamination has been linked to health problems, acid rain, ozone layer depletion and emission of ammonia gas etc 

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21. _____ is prepared from petroleum by the process called polymerization.

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22. ____ is a process in which many similar and smaller molecules called monomer, combine to form a larger molecule called polymer

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23. Polythene is obtained by the polymerization of

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24. Nylon, polythene, PVC and Teflon are example of 

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25. Vegetable oil is ____ at room temperature.

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26. In ghee industry, vegetable oil is converted into solid fat (banaspati ghee) by the process called:

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27. Complete the formula: vegetable oil + ____ Ni/250-300°C → Vegetable Ghee

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28. Vegetable oil change into soap, the process is called:

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29. During a physical change, the chemical composition of the substance:

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30. Hydrocarbons are the compounds of carbon and:

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31. Polythene is a:

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32. The products of burning hydrocarbons are:

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33. Vegetable oil is converted into a solid fat by a process called:

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