Substances in Common Use — Important Questions
Maharashtra Board · Class 9 · Science
45 important questions from Substances in Common Use for Maharashtra Board Class 9 Science, with answers. Includes multiple choice, multiple correct.
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Important Questions from Substances in Common Use
Which of the following substances are used to make food items porous and crispy?
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Baking soda (NaHCO₃), Baking powder
Baking soda and baking powder release CO₂ gas when heated, which makes batter porous and food items like cakes and dhokla fluffy.
Which of the following are types of radioactive radiation?
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Alpha rays, Beta rays, Gamma rays
Radioactive substances emit three types of radiation: alpha (α), beta (β), and gamma (γ) rays, each with different properties and penetrating power.
Alum is used in water purification because it helps in:
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Coagulation of impurities
Alum causes coagulation, where solid impurities in water come together, become heavy and settle down, making water clear.
Teflon is used for coating cooking utensils because:
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Nothing sticks to its surface
Teflon's main property is that neither water nor oil sticks to its surface, making it ideal for non-stick cookware.
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