2.sorting metals into groups

Question 1

Which of the following materials is typically shiny in appearance?
A) Wood
B) Glass
C) Plastic
D) Metal

Answer 1

Answer: D) Metal

Question 2

Which of the following is an example of an opaque material?
A) Glass
B) Wood
C) Wax paper
D) Water

Answer 2

Answer: B) Wood

Question 3

Which of the following is an example of a translucent material?
A) Clear glass
B) Frosted glass
C) Wooden plank
D) Aluminium foil

Answer 3

Answer: B) Frosted glass

Question 4

With reference to the classification of materials, consider the following statements:

1 Grouping materials helps in identifying patterns in their properties.
2 All metals are opaque, and all non-metals are non-conductors of electricity.
3 Materials with shiny surfaces are always conductors of heat.
Which of the above statements is/are correct?
(a) 1 only
(b) 1 and 2 only
(c) 1 and 3 only
(d) 1, 2, and 3

Answer 4

(a) 1 only
Explanation:
Grouping materials helps in identifying patterns in their properties:

This is correct. Grouping materials based on their properties, such as luster, conductivity, and hardness, helps in understanding their behavior and applications.
All metals are opaque, and all non-metals are non-conductors of electricity:

This is incorrect. While most metals are opaque, not all non-metals are non-conductors. For example, graphite, a non-metal, conducts electricity.
Materials with shiny surfaces are always conductors of heat:

This is incorrect. Not all shiny materials are conductors of heat. For example, some shiny materials like glass may reflect light but are poor conductors of heat.