Class 7 Science MCQs - Chapter 18

Physical and Chemical Changes Quiz Questions and Answers PDF - 19

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Physical and Chemical Changes Questions & Answers PDF Download: MCQ Quiz 19

MCQ 91: Nitrogen is obtained from

gaseous air
liquefied air
solidified air
air spaces in soil

MCQ 92: The reason of low density of gases is

number of particles per unit area
number of particles per unit volume
mass per unit area
mass per unit volume

MCQ 93: The reaction that gives out heat, while taking place is known as

exothermic reaction
endothermic reaction
reversible reaction
substitution reaction

MCQ 94: The 'volume' of gases is

indefinite
definite
dependent
reduced

MCQ 95: The compounds made up of hydrogen and carbon are known as

carbohydrates
hydrocarbons
alkanes
alkenes

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