Imp Questions For All Chapters – General Science Class 6
Substances in the Surroundings – Their States and Properties
Short Questions
1. What are the three states of matter?
Answer : Solid, Liquid, Gas
2. What is the solid form of water called?
Answer : Ice
3. What is the gaseous form of water?
Answer : Water vapor
4. What happens when ice is heated?
Answer : It melts into water
5. What happens when water is cooled?
Answer : It freezes into ice
6. Which instrument measures temperature?
Answer : Thermometer
7. At what temperature does water boil?
Answer : 100°C
8. At what temperature does water freeze?
Answer : 0°C
9. What is the process of changing a solid into a gas directly?
Answer : Sublimation
10. Which solid changes directly into gas?
Answer : Camphor, naphthalene
11. Which metal is used in electric wires?
Answer : Copper
12. What is used to make glass?
Answer : Sand (Silica)
13. Which metal is used to make ornaments?
Answer : Gold, Silver
14. Why are cooking pots made of metal?
Answer : Metals conduct heat
15. What is the liquid inside a thermometer?
Answer : Mercury
Long Questions
1. What is condensation? Give an example.
Answer : Condensation is the process where gas turns into a liquid when cooled. Example: Water vapor cools to form water droplets on a cold surface.
2. Why do we use plastic handles on cooking utensils?
Answer : Plastic does not conduct heat, so it protects our hands from getting burned while holding hot utensils.
3. What is evaporation? Give an example.
Answer : Evaporation is the process where a liquid changes into gas at normal temperature. Example: Water spilled on the floor dries up after some time.
4. Why do naphthalene balls become smaller over time?
Answer : Naphthalene balls undergo sublimation, where they change directly from solid to gas without becoming liquid.
5. Why do metals shine?
Answer : Metals have a property called lustre, which makes them shine. This is why gold, silver, and other metals are used to make jewelry.
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