NCERT Class 7 Science MCQ | Chapter 4: The World of Metals and Non-metals
1. Which of the following is a metal?
(A) Iron
(B) Sulphur
(C) Carbon
(D) Oxygen
Answer: (A) Iron
2. Which of the following is a non-metal?
(A) Copper
(B) Aluminium
(C) Sulphur
(D) Iron
Answer: (C) Sulphur
3. Which property is generally associated with metals?
(A) Lustre
(B) Dull appearance
(C) Poor electrical conductivity
(D) Brittleness
Answer: (A) Lustre
4. What is the ability of metals to be beaten into thin sheets called?
(A) Ductility
(B) Malleability
(C) Sonority
(D) Hardness
Answer: (B) Malleability
5. What is the ability of metals to be drawn into wires called?
(A) Malleability
(B) Ductility
(C) Sonority
(D) Lustre
Answer: (B) Ductility
6. Which of the following metals is commonly used for making electrical wires?
(A) Copper
(B) Sulphur
(C) Carbon
(D) Phosphorus
Answer: (A) Copper
7. Why is copper suitable for making electrical wires?
(A) It is a good conductor of electricity
(B) It is a poor conductor of electricity
(C) It is very brittle
(D) It is a non-metal
Answer: (A) It is a good conductor of electricity
8. Which of the following is generally a good conductor of heat?
(A) Copper
(B) Wood
(C) Plastic
(D) Rubber
Answer: (A) Copper
9. Which property of metals allows them to produce a ringing sound when struck?
(A) Malleability
(B) Sonority
(C) Ductility
(D) Solubility
Answer: (B) Sonority
10. Which of the following is generally brittle in its solid form?
(A) Metals
(B) Non-metals
(C) All metals
(D) All liquids
Answer: (B) Non-metals
11. Which of the following is a non-metal that exists as a solid at room temperature?
(A) Sulphur
(B) Mercury
(C) Copper
(D) Aluminium
Answer: (A) Sulphur
12. Which metal is liquid at room temperature?
(A) Iron
(B) Copper
(C) Mercury
(D) Aluminium
Answer: (C) Mercury
13. Which of the following is a common use of aluminium?
(A) Making utensils and packaging materials
(B) Making rubber erasers
(C) Making wooden furniture
(D) Making paper
Answer: (A) Making utensils and packaging materials
14. Why are metals commonly used for making cooking utensils?
(A) They generally conduct heat well
(B) They are always poor conductors of heat
(C) They cannot withstand heating
(D) They are non-metals
Answer: (A) They generally conduct heat well
15. Which of the following metals is commonly used for making jewellery?
(A) Gold
(B) Sodium
(C) Calcium
(D) Magnesium
Answer: (A) Gold
16. Which property makes gold suitable for making jewellery?
(A) Lustre and ability to be shaped
(B) Brittleness
(C) Poor appearance
(D) Very low melting point
Answer: (A) Lustre and ability to be shaped
17. Which of the following is an important use of iron?
(A) Making tools and machines
(B) Making food items
(C) Making paper
(D) Making rubber
Answer: (A) Making tools and machines
18. Which of the following is a characteristic of most metals?
(A) They are generally lustrous
(B) They are always gases
(C) They are always brittle
(D) They are poor conductors of electricity
Answer: (A) They are generally lustrous
19. Which of the following is a characteristic of most non-metals?
(A) They are generally poor conductors of electricity
(B) They are always shiny
(C) They are always malleable
(D) They are always ductile
Answer: (A) They are generally poor conductors of electricity
20. Which non-metal is commonly used in pencils in the form of graphite?
(A) Carbon
(B) Sulphur
(C) Oxygen
(D) Nitrogen
Answer: (A) Carbon
21. Which of the following is an exception among non-metals because it conducts electricity?
(A) Graphite
(B) Sulphur
(C) Phosphorus
(D) Oxygen
Answer: (A) Graphite
22. What happens when metals are exposed to air and moisture for a long time?
(A) Some metals may undergo corrosion
(B) All metals turn into gases
(C) Metals always become stronger
(D) Metals stop reacting completely
Answer: (A) Some metals may undergo corrosion
23. Which process causes iron objects to develop a reddish-brown coating?
(A) Rusting
(B) Melting
(C) Freezing
(D) Evaporation
Answer: (A) Rusting
24. Which of the following can help protect iron from rusting?
(A) Painting
(B) Keeping it wet
(C) Scratching its surface
(D) Exposing it continuously to moist air
Answer: (A) Painting
25. Which statement correctly describes metals and non-metals?
(A) Metals generally show properties such as lustre, malleability and good electrical conductivity, while non-metals generally do not
(B) All metals and non-metals have exactly the same properties
(C) All non-metals are good conductors of electricity
(D) Metals are always gases at room temperature
Answer: (A) Metals generally show properties such as lustre, malleability and good electrical conductivity, while non-metals generally do not
