Unit 7 Physical and Chemical Changes and Processes

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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 
  1. ____ is a property that is measurable and whose value describes a state of a physical system.
  • Chemical properties 
  • Physical properties 
  • Reversible change
  • Irreversible changes
  1. The properties which are related with the chemical reactions occurring in a substance are called:  ____ 
  • Chemical properties 
  • Physical properties 
  • Reversible change
  • Irreversible changes
  1. Changes of processes, that can be reversed are called:
  • Chemical properties 
  • Physical properties 
  • Reversible change
  • Irreversible changes
  1. Changes of processes, that cannot be reversed are called:
  • Chemical properties 
  • Physical properties 
  • Reversible change
  • Irreversible changes
  1. 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 
  1. Change in which chemical properties of a substance change and new substance is formed is called:
  • Physical Change
  • Chemical change
  • Chemical properties 
  • Physical properties 
  1. Most of the physical changes are ____
  • irreversible   
  • reversible 
  • Both A & B 
  • None of these
  1.  Most of the chemical changes are ____
  • irreversible   
  • reversible 
  • Both A & B 
  • None of these
  1. The solutes and solvents in the solutions can be easily separated by:
  • Evaporation  
  • Distillation 
  • Both A & B 
  • None of these 
  1. ____ are found in coal, crude oil and natural gas.
  • Fertilizers   
  • air
  • Hydrocarbons  
  • None of these 
  1. ____ are organic compounds that are made up of only hydrogen and carbon atoms.
  • Fertilizers   
  • air
  • Hydrocarbons  
  • None of these   
  1.  Hydrocarbons burn in air producing carbon dioxide, water and large amounts of energy.
  • Water 
  • Soil  
  • Air 
  • Fertilizers  
  1. Complete the formula: Natural gas + _____ carbon dioxide + Water + energy
  • Helium 
  • oxygen
  • Nitrogen 
  • Sodium 
  1. The chemical process that gives out heat is called:
  • energy
  • Photosynthesis 
  • Combustion 
  • Chemical change
  1. Plant require a number of soil nutrients like ____ for their growth
  • Nitrogen 
  • Phosphorus 
  • Potassium 
  • All of these
  1. Natural fertilizers include manures, ____
  • Plant ashes,
  • Lime 
  • Gypsum 
  • All of these
  1. ____ are natural or artificial substances composed of the chemical elements.
  • Fertilizers 
  • Wood 
  • Air 
  • Water
  1. The biggest problem caused by chemical fertilizers is ____ contamination.
  • air
  • soil
  • groundwater
  • None of these
  1. ____ contamination has been linked to health problems, acid rain, ozone layer depletion and emission of ammonia gas etc 
  • Air 
  • Soil 
  • Groundwater 
  • None of these
  1. _____ is prepared from petroleum by the process called polymerization.
  • Iron 
  • Plastic 
  • Petrol 
  • Copper  
  1. ____ is a process in which many similar and smaller molecules called monomer, combine to form a larger molecule called polymer
  • Polymerization 
  • Separation  
  • Combustion 
  • Neutral 
  1. Polythene is obtained by the polymerization of
  • Ethane 
  • Propane  
  • Methane 
  • Ethene 
  1. Nylon, polythene, PVC and Teflon are example of 
  • Wood 
  • Iron 
  • Clothes 
  • Plastic 
  1. Vegetable oil is ____ at room temperature.
  • Solid 
  • Liquid 
  • Both of them
  • None of these
  1. In ghee industry, vegetable oil is converted into solid fat (banaspati ghee) by the process called:
  • Hydrogenation 
  • Polymerization 
  • Separation  
  • Combustion 
  1. Complete the formula: vegetable oil + ____ Ni/250-300°C → Vegetable Ghee
  • Hydrogen 
  • Nitrogen 
  • Oxygen 
  • Carbon dioxide   
  1. Vegetable oil change into soap, the process is called: 
  • Hydrogenation 
  • Polymerization 
  • Saponification   
  • Combustion 
  1. During a physical change, the chemical composition of the substance:
  • Change 
  • Does not change 
  • Permanently changes
  • Temporarily changes 
  1. Hydrocarbons are the compounds of carbon and:
  • Oxygen 
  • Hydrogen 
  • Nitrogen  
  • Chlorine 
  1. Polythene is a:
  • Monomer 
  • Polymer 
  • Element 
  • Fertilizer 
  1. The products of burning hydrocarbons are:
  • Carbon dioxide and water
  • Carbon dioxide and oxygen
  • Oxygen and water
  • Nitrogen and oxygen
  1. Vegetable oil is converted into a solid fat by a process called:
  • Respiration 
  • Photosynthesis 
  • Polymerization 
  • Hydrogeneation 

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