Class 7 General Science, Chapter # 7, MCQs with answers

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1. ____ doesn’t always stay the same.

• Matter 
• Atom 
• Action and reaction
• Inertia 

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

• Chemical properties 
• Physical properties 
• Reversible change
• Irreversible changes

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

• Chemical properties 
• Physical properties 
• Reversible change
• Irreversible changes

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

• Chemical properties 
• Physical properties 
• Reversible change
• Irreversible changes

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

• Chemical properties 
• Physical properties 
• Reversible change
• Irreversible changes

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

• Physical Change
• Chemical change
• Chemical properties 
• Physical properties 

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

• Physical Change
• Chemical change
• Chemical properties 
• Physical properties 

8. Most of the physical changes are ____

• irreversible   
• reversible 
• Both A & B 
• None of these

9.  Most of the chemical changes are ____

• irreversible   
• reversible 
• Both A & B 
• None of these

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

• Evaporation  
• Distillation 
• Both A & B 
• None of these 

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

• Fertilizers   
• air
• Hydrocarbons  
• None of these 

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

• Fertilizers   
• air
• Hydrocarbons  
• None of these   

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

• Water 
• Soil  
• Air 
• Fertilizers  

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

• Helium 
• oxygen
• Nitrogen 
• Sodium 

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

• energy
• Photosynthesis 
• Combustion 
• Chemical change

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

• Nitrogen 
• Phosphorus 
• Potassium 
• All of these

17. Natural fertilizers include manures, ____

• Plant ashes,
• Lime 
• Gypsum 
• All of these

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

• Fertilizers 
• Wood 
• Air 
• Water

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

• air
• soil
• groundwater
• None of these

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

• Air 
• Soil 
• Groundwater 
• None of these

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

• Iron 
• Plastic 
• Petrol 
• Copper  

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

• Polymerization 
• Separation  
• Combustion 
• Neutral 

23. Polythene is obtained by the polymerization of

• Ethane 
• Propane  
• Methane 
• Ethene 

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

• Wood 
• Iron 
• Clothes 
• Plastic 

25. Vegetable oil is ____ at room temperature.

• Solid 
• Liquid 
• Both of them
• None of these

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

• Hydrogenation 
• Polymerization 
• Separation  
• Combustion 

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

• Hydrogen 
• Nitrogen 
• Oxygen 
• Carbon dioxide   

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

• Hydrogenation 
• Polymerization 
• Saponification   
• Combustion 

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

• Change 
• Does not change 
• Permanently changes
• Temporarily changes 

30. Hydrocarbons are the compounds of carbon and:

• Oxygen 
• Hydrogen 
• Nitrogen  
• Chlorine 

31. Polythene is a:

• Monomer 
• Polymer 
• Element 
• Fertilizer 

32. The products of burning hydrocarbons are:

• Carbon dioxide and water
• Carbon dioxide and oxygen
• Oxygen and water
• Nitrogen and oxygen

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

• Respiration 
• Photosynthesis 
• Polymerization 
• Hydrogeneation