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Class 7 General Science, Chapter # 7, MCQs with answers
- ____ doesn’t always stay the same.
- Matter
- Atom
- Action and reaction
- Inertia
- ____ is a property that is measurable and whose value describes a state of a physical system.
- Chemical properties
- Physical properties
- Reversible change
- Irreversible changes
- The properties which are related with the chemical reactions occurring in a substance are called: ____
- Chemical properties
- Physical properties
- Reversible change
- Irreversible changes
- Changes of processes, that can be reversed are called:
- Chemical properties
- Physical properties
- Reversible change
- Irreversible changes
- Changes of processes, that cannot be reversed are called:
- Chemical properties
- Physical properties
- Reversible change
- Irreversible changes
- 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
- Change in which chemical properties of a substance change and new substance is formed is called:
- Physical Change
- Chemical change
- Chemical properties
- Physical properties
- Most of the physical changes are ____
- irreversible
- reversible
- Both A & B
- None of these
- Most of the chemical changes are ____
- irreversible
- reversible
- Both A & B
- None of these
- The solutes and solvents in the solutions can be easily separated by:
- Evaporation
- Distillation
- Both A & B
- None of these
- ____ are found in coal, crude oil and natural gas.
- Fertilizers
- air
- Hydrocarbons
- None of these
- ____ are organic compounds that are made up of only hydrogen and carbon atoms.
- Fertilizers
- air
- Hydrocarbons
- None of these
- Hydrocarbons burn in air producing carbon dioxide, water and large amounts of energy.
- Water
- Soil
- Air
- Fertilizers
- Complete the formula: Natural gas + _____ → carbon dioxide + Water + energy
- Helium
- oxygen
- Nitrogen
- Sodium
- The chemical process that gives out heat is called:
- energy
- Photosynthesis
- Combustion
- Chemical change
- Plant require a number of soil nutrients like ____ for their growth
- Nitrogen
- Phosphorus
- Potassium
- All of these
- Natural fertilizers include manures, ____
- Plant ashes,
- Lime
- Gypsum
- All of these
- ____ are natural or artificial substances composed of the chemical elements.
- Fertilizers
- Wood
- Air
- Water
- The biggest problem caused by chemical fertilizers is ____ contamination.
- air
- soil
- groundwater
- None of these
- ____ contamination has been linked to health problems, acid rain, ozone layer depletion and emission of ammonia gas etc
- Air
- Soil
- Groundwater
- None of these
- _____ is prepared from petroleum by the process called polymerization.
- Iron
- Plastic
- Petrol
- Copper
- ____ is a process in which many similar and smaller molecules called monomer, combine to form a larger molecule called polymer
- Polymerization
- Separation
- Combustion
- Neutral
- Polythene is obtained by the polymerization of
- Ethane
- Propane
- Methane
- Ethene
- Nylon, polythene, PVC and Teflon are example of
- Wood
- Iron
- Clothes
- Plastic
- Vegetable oil is ____ at room temperature.
- Solid
- Liquid
- Both of them
- None of these
- In ghee industry, vegetable oil is converted into solid fat (banaspati ghee) by the process called:
- Hydrogenation
- Polymerization
- Separation
- Combustion
- Complete the formula: vegetable oil + ____ Ni/250-300°C → Vegetable Ghee
- Hydrogen
- Nitrogen
- Oxygen
- Carbon dioxide
- Vegetable oil change into soap, the process is called:
- Hydrogenation
- Polymerization
- Saponification
- Combustion
- During a physical change, the chemical composition of the substance:
- Change
- Does not change
- Permanently changes
- Temporarily changes
- Hydrocarbons are the compounds of carbon and:
- Oxygen
- Hydrogen
- Nitrogen
- Chlorine
- Polythene is a:
- Monomer
- Polymer
- Element
- Fertilizer
- The products of burning hydrocarbons are:
- Carbon dioxide and water
- Carbon dioxide and oxygen
- Oxygen and water
- Nitrogen and oxygen
- Vegetable oil is converted into a solid fat by a process called:
- Respiration
- Photosynthesis
- Polymerization
- Hydrogeneation
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