The World of Metals and Non metals Class 7 MCQ
hardThe World of Metals and Non metals Class 7 MCQ
The World of Metals and Non metals Class 7 MCQ
Question 1.
Which property allows metals to be drawn into wires?
(a) Brittleness
(b) Ductility
(c) Malleability
(d) Sonority
Answer:
(b) Ductility
Question 2.
What is formed when an element reacts with oxygen?
(a) Alloy
(b) Oxide
(c) Acid
(d) Salt
Answer:
(b) Oxide
Question 3.
Which element category is typically shiny and a good conductor?
(a) Non-metals
(b) Metalloids
(c) Metals
(d) Gases
Answer:
(c) Metals
Question 4.
What does galvanisation prevent?
(a) Malleability
(b) Ductility
(c) Rusting
(d) Alloying
Answer:
(c) Rusting
Question 5.
Which of the following is NOT a characteristic of non-metals?
(a) Poor conductor
(b) Brittle
(c) Lustrous
(d) Not shiny
Answer:
(c) Lustrous
Question 6.
A craftsperson who works with iron is called a:
(a) Blacksmith
(b) Carpenter
(c) Ironsmith
(d) Mason
Answer:
(c) Ironsmith
Question 7.
What does corrosion usually require to occur?
(a) Sunlight
(b) Oxygen
(c) Heat
(d) Electricity
Answer:
(b) Oxygen
Question 8.
What describes the ability to be hammered into sheets?
(a) Ductility
(b) Malleability
(c) Reactivity
(d) Hardness
Answer:
(b) Malleability
Question 9.
What type of bridge hangs below suspension cables?
(a) Beam bridge
(b) Arch bridge
(c) Suspension bridge
(d) Cantilever bridge
Answer:
(c) Suspension bridge
Question 10.
Which one of the followings is a mixture of metals and non-metals?
(a) Compound
(b) Solution
(c) Alloy
(d) Oxide
Answer:
(c) Alloy
Case Study
I. Heat Conduction in Metals and Nonmetals: When comparing the heat conduction properties of metals and non-metals, we observe a significant difference. Metals, such as copper and aluminium are excellent conductors of heat, which means they can transfer heat energy quickly. This is why metal spoons become hot when immersed in hot water, while wooden spoons remain relatively cool. The ability of metals to conduct heat effectively makes them ideal for cooking utensils, while non-metals like wood are used for handles to prevent burns.
Question 1.
Which of the following metals is known for its excellent heat conduction properties?
(a) Iron
(b) Copper
(c) Gold
(d) Lead
Answer:
(b) Copper
Question 2.
Why wooden handles are often used in cooking utensils made of metal?
(a) Wood is a good conductor of heat.
(b) Wood is a poor conductor of heat.
(c) Wood is more durable than metal.
(d) Wood is less expensive than metal.
Answer:
(b) Wood is a poor conductor of heat.
Question 3.
Metals, such as ............ and ............ are excellent conductors of heat, making them ideal for cooking utensils.
Answer:
Copper, Aluminium
Question 4.
The property of materials to transfer heat is known as ............ , and metals are generally good ............ of heat.
Answer:
conduction, conductors
Question 5.
Non-metals, such as wood, are better conductors of heat than metals like copper and aluminium. (True or False)
Answer:
False
II. Properties of Metals and Nonmetals: Metals generally exhibit properties such as metallic lustre, malleability, and ductility. For example, copper and aluminium are lustrous and can be hammered into thin sheets without breaking. In contrast, nonmetals like sulfur and coal lack lustre and are brittle. Understanding these properties helps us categorise materials and predict their behaviour in various applications, such as construction and manufacturing.
Question 1.
What property do metals like copper and aluminium exhibit that allows them to be hammered into thin sheets?
Answer:
Malleability.
Question 2.
Name a non-metal that is described as brittle in the paragraph.
Answer:
Sulfur.
Question 3.
Why is it important to understand the properties of metals and non-metals in applications like construction and manufacturing?
Answer:
Understanding these properties helps us that the right materials are used for specific applications. For example, metals are preferred for structural components due to their strength and malleability, while non-metals may be used for insulation or chemical applications.