VSAQ for Chapter 4 The World of Metals and Non-metals Class 7 Science NCERT
Important Questions1
Q1: What is the property that allows metals like gold to be stretched into thin wires?
Answer
Ductility.
2
Q2: What items do ironsmiths generally make?
Answer
Flat pans, buckets, tongs, spades, axes, trowels, and rakes.3
Q3: What material is mainly used to make these items?
Answer
Iron metal.4
Q4: What is used to heat the iron in the furnace?
Answer
Coal.5
Q5: What is the property that allows metals to be beaten into thin sheets?
Answer
Malleability.
6
Q6: Which metal is the most malleable?
Answer
Gold.7
Q7: What happens to metals like copper and aluminum when beaten with a hammer?
Answer
They flatten.8
Q8: What is the name of the process when metals break into pieces?
Answer
Brittle behavior.9
Q9: What does ductility allow metals to do?
Answer
Be drawn into wires.10
Q10: Which metal is used for making electric wires?
Answer
Copper.11
Q11: What is the ringing sound produced by metal called?
Answer
Sonority.
12
Q12: What property of metals makes them good for cooking vessels?
Answer
Conduction of heat.13
Q13: What is the term for the process when iron gets damaged by exposure to air and water?
Answer
Rusting.14
Q14: What is the brown deposit formed on iron due to rusting called?
Answer
Rust.
15
Q15: Which metal reacts vigorously with water and is stored in kerosene?
Answer
Sodium.16
Q16: What is the nature of the oxide of magnesium?
Answer
Basic.17
Q17: What type of reaction occurs when magnesium burns in air?
Answer
It forms magnesium oxide.
18
Q18: What is the purpose of applying a protective layer of zinc on iron?
Answer
To prevent rusting.19
Q19: Which non-metal is essential for respiration?
Answer
Oxygen.20
Q20: What is formed when sulfur reacts with oxygen?
Answer
Sulfur dioxide.21
Q21: What is the process by which metals like iron develop brown deposits?
Answer
This process is called rusting, and it occurs when iron comes into contact with both air and water.22
Q22: What is the property of metals that allows them to be beaten into thin sheets?
Answer
Malleability23
Q23: Why are materials like copper and aluminium used in electrical wiring?
Answer
Because they are good conductors of electricity.24
Q24: What happens when magnesium reacts with oxygen?
Answer
Magnesium burns with a dazzling white flame and forms magnesium oxide.25
Q25: What is the nature of magnesium oxide when dissolved in water?
Answer
Magnesium oxide forms a basic solution when dissolved in water.