Physical and Chemical Changes Multiple Choice Questions and Answers 19 PDF Download

Physical and chemical changes multiple choice questions (MCQs), physical and chemical changes test prep 19 to learn online elementary school courses, distance learning for exam prep. Practice making ammonia multiple choice questions (MCQs), physical and chemical changes quiz questions and answers for science class for grade 7 science tutor questions with answers.

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MCQ on Physical and Chemical Changes Worksheets 19 Quiz PDF Download

MCQ: Nitrogen is obtained from

  1. gaseous air
  2. liquefied air
  3. solidified air
  4. air spaces in soil


MCQ: Reason of low density of gases is

  1. number of particles per unit area
  2. number of particles per unit volume
  3. mass per unit area
  4. mass per unit volume


MCQ: Reaction that gives out heat, while taking place is known as

  1. exothermic reaction
  2. endothermic reaction
  3. reversible reaction
  4. substitution reaction


MCQ: 'volume' of gases is

  1. indefinite
  2. definite
  3. dependent
  4. reduced


MCQ: Compounds made up of hydrogen and carbon are known as

  1. carbohydrates
  2. hydrocarbons
  3. alkanes
  4. alkenes