Unit 5, Water – General Science MCQs class 7

Unit 5, Water - General Science MCQs class 7

Class 7 General Science, Chapter # 5, MCQs with answers

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  1. About ____ of the Earth’s surface is covered by water 
  • 71% 
  • 75%
  • 17% 
  • 69%
  1. Water is the second most essential requirement for the survival of life, after ____
  • Heat 
  • air
  • Sun light 
  • Soil 
  1. Water comprises approximately ____ percent of the weight of an adult human body.
  • 60%
  • 70%
  • 66%
  • 80% 
  1. _____ contains more than 97 percent of the total water.
  • Rivers 
  • Lakes 
  • Canals 
  • Oceans 
  1. Fresh water needed for human requirements is nearly ____ of the total.
  • 6%
  • 4%
  • 2%
  • 1%
  1. Fresh water is defined as water with a salinity of less than 1% that of the oceans. i.e below around ____  
  • 0.35%
  • 0.45% 
  • 0.40%
  • 0.50%
  1. _____ occurs when undesirable foreign substances are introduced into natural water.
  • Minerals 
  • Pollutants  
  • Soil pollution 
  • Water pollution
  1. Substances that cause water pollution are called  _____ .
  • Pollutants  
  • Sewage  
  • Wastes  
  • Garbage  
  1.  ______ structure is damaged due to acid rain.
  • Minar e Pakistan
  • Shahi fort  
  • Taj Mahal 
  • Shalimar bagh 
  1. ______ consists of two basic processes: boiling and condensation. 
  • Water cycle
  • Impurities 
  • Distillation 
  • floc
  1. Suspended particles stick together forming larger particles called:
  • floc
  • Water cycle
  • Impurities 
  • Distillation 
  1. Settling process is called:
  • disinfectant 
  • Dissolved
  • floc
  • Sedimentation  
  1.  _______ added in order to protect water from germs.
  • Potash alum 
  • Chlorine  
  • Lime water  
  • Oxygen  
  1. Percentage of water on earth’s surface is about:
  • 50%
  • 70%
  • 60%
  • 80% 
  1. Pesticides and fertilizers are the source of:
  • Domestic waste
  • Industrial waste
  • Agriculture waste  
  • Acid rain
  1. Harmful bacteria are removed from water by passing:
  • Oxygen gas
  • Nitrogen gas
  • Chlorine gas
  • Carbon dioxide gas
  1. Suspended particles from drinking water are removed by:
  • Table salt
  • Chlorine 
  • Charcoal 
  • Potash alum
  1. Distillation is a technique of:
  • Separation 
  • Preparation 
  • Filtration 
  • Disinfection

Also Read:

General Science Mcqs Unit 1

General Science Mcqs Unit 2

General Science Mcqs Unit 3

General Science Mcqs Unit 4

General Science Mcqs Unit 6

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