Physical and Chemical Changes
John Hyatt’s invention was about
cellulose in wood
soil particles under plant roots
plant stem
barks of wood
cellulose in wood
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Plastic was accidently invented when the inventor was trying to makeA. a cup for coffee
B. an artificial ivory of billiard balls
C. an artificial sword for martial arts training
D. his favourite dish
The mixture of iron and sulphur is separated by
A. filtration
B. magnet
C. distillation
D. evaporation
In liquids the force of attraction between particles is
A. weaker than gases
B. stronger than gases but weaker than solids
C. stronger than solids but weaker than gases
D. stronger than solids and gases
Number of atoms in one molecule of ethene is
A. 2
B. 3
C. 4
D. 6
The color of solid iron is
A. green
B. brown
C. grey
D. black
The reactions of ‘exothermic’ are
A. condensation reactions
B. endothermic reactions
C. reversible reactions
D. substitution reactions
In chemical reactions, energy is absorbed or released in the form of
A. sound
B. light
C. electricity
D. heat
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