CBSE Class 7 Science Chapter 04 The World Of Metals And Non Metals MCQs Set 01

Practice MCQs for Class 7 Science Chapter 04 The World Of Metals And Non Metals

Review structured MCQ sets for Class 7 Science Chapter 04 The World Of Metals And Non Metals. Built according to official CBSE guidelines, these downloadable questions support daily revision and core concept reinforcement.

Access Chapter 04 The World Of Metals And Non Metals Questions and Solutions

View or download the dedicated Chapter 04 The World Of Metals And Non Metals MCQ resource below. Practicing these 50 objective questions regularly builds familiarity with standard exam patterns and helps secure higher marks in final Science evaluations.

Question: When Sudarshan uncle heats iron in the furnace until it becomes red hot and then beats it with a hammer, what property of the metal is he demonstrating?
A. Ductility, which allows the metal to be drawn into wires
B. Malleability, which enables the metal to be shaped by hammering
C. Sonority, which produces a ringing sound when struck
D. Conductivity, which transfers heat quickly through the material
Show Answer & Explanation

Answer: (B) Malleability, which enables the metal to be shaped by hammering

Explanation:
The chapter describes how Sudarshan beats the hot iron to shape it into an axe, illustrating malleability—the property that allows metals to be beaten into thin sheets or desired shapes without breaking.

Question: In Activity 4.1, when objects are struck with a hammer, copper and aluminium flatten while coal and sulfur break into pieces. What distinguishes these two groups of materials?
A. Metals are lustrous and non-metals are always dull
B. Metals are malleable whereas non-metals are brittle
C. Metals conduct electricity better than non-metals
D. Metals are harder but non-metals are more flexible
Show Answer & Explanation

Answer: (B) Metals are malleable whereas non-metals are brittle

Explanation:
The chapter explains that materials like copper and aluminium become flat when beaten due to malleability, while coal and sulfur break apart because they are brittle—lacking the capacity to deform without shattering.

Question: According to the text, what is the relationship between the formation of brown deposits on iron and environmental conditions?
A. Brown deposits form when iron is exposed to dry air only
B. Brown deposits form when iron is in contact with water only
C. Brown deposits form only when iron is exposed to both water and air simultaneously
D. Brown deposits form regardless of whether air or water is present
Show Answer & Explanation

Answer: (C) Brown deposits form only when iron is exposed to both water and air simultaneously

Explanation:
Activity 4.5 demonstrates that iron nails in dry air (bottle A) and in water without air (bottle B) show no rust, but the nail in bottle C—exposed to both water and air—develops brown deposits, proving that moist air causes rusting.

Question: Based on the chapter, why does an electrician wear rubber gloves and use tools with plastic or rubber handles when working with electrical equipment?
A. To protect from getting shocked because these materials are poor conductors of electricity
B. To insulate the tools and prevent them from getting too hot
C. To improve grip and handle electrical wires more easily
D. To prevent the tools from becoming magnetized
Show Answer & Explanation

Answer: (A) To protect from getting shocked because these materials are poor conductors of electricity

Explanation:
The chapter explains that plastic and rubber are poor conductors of electricity, which is why they are used to protect electricians from electric shock by preventing the flow of current through their bodies.

Question: When magnesium ribbon burns in air and the resulting white powder is mixed with water, what type of substance is formed?
A. An acidic solution that turns blue litmus paper red
B. A basic solution that turns red litmus paper blue
C. A neutral solution that does not affect litmus paper
D. A solution that cannot be tested with litmus paper
Show Answer & Explanation

Answer: (B) A basic solution that turns red litmus paper blue

Explanation:
Activity 4.6 demonstrates that when magnesium oxide (the white powder) dissolves in water, it forms a basic solution that changes red litmus paper to blue, consistent with the chapter's statement that metal oxides are generally basic in nature.

Question: How does the behavior of sulfur differ from metals when sulfur burns in air and then the resulting gas dissolves in water?
A. • Sulfur burns to form a metal oxide, which is basic • When dissolved in water, it produces an acidic solution • This contrasts with metals that produce basic oxides
B. Sulfur reacts the same way as metals and produces basic oxides
C. Sulfur does not burn in air like metals do
D. The products of sulfur burning are always neutral in nature
Show Answer & Explanation

Answer: (A) • Sulfur burns to form a metal oxide, which is basic • When dissolved in water, it produces an acidic solution • This contrasts with metals that produce basic oxides

Explanation:
Activity 4.7 shows sulfur burning to form sulfur dioxide gas, which dissolves in water to create sulfurous acid—an acidic solution that differs fundamentally from metal oxides, which are basic in nature, illustrating how non-metals behave differently than metals.

Question: What can be inferred about why sodium metal is stored in kerosene according to the chapter?
A. Kerosene keeps sodium from becoming dull and losing its lustre
B. Kerosene prevents sodium from reacting vigorously with oxygen and water, which would generate heat and be dangerous
C. Kerosene improves the electrical conductivity of sodium
D. Kerosene prevents sodium from corroding with oxygen
Show Answer & Explanation

Answer: (B) Kerosene prevents sodium from reacting vigorously with oxygen and water, which would generate heat and be dangerous

Explanation:
The chapter states that sodium reacts vigorously with oxygen and water, generating considerable heat, so storing it in kerosene prevents exposure to moisture and air, making it a safety measure for handling this reactive metal.

Question: Which of the following statements best reflects the relationship between metal properties and their practical applications in everyday life?
A. Metals are used only because they are lustrous and attractive in appearance
B. The specific properties of metals—such as malleability, ductility, heat conduction, and electrical conductivity—determine which metals are suitable for different purposes
C. All metals have identical properties and can be used interchangeably for any application
D. Non-metals are never used in practical applications because they lack the key properties of metals
Show Answer & Explanation

Answer: (B) The specific properties of metals—such as malleability, ductility, heat conduction, and electrical conductivity—determine which metals are suitable for different purposes

Explanation:
Throughout the chapter, each property of metals (malleability for beating into shapes, ductility for wires, heat conduction for cooking vessels, electrical conductivity for wiring) is directly linked to specific practical uses, showing how properties determine applications.

Question: What is the primary reason that an iron nail kept in water alone (bottle B) does not develop rust deposits?
A. Water prevents oxygen from reaching the iron surface
B. The iron is not exposed to moist air because the water excludes oxygen
C. Iron requires both water and oxygen simultaneously to form rust
D. The oil layer in bottle B prevents the formation of rust
Show Answer & Explanation

Answer: (C) Iron requires both water and oxygen simultaneously to form rust

Explanation:
Activity 4.5 establishes that rust forms only when iron is exposed to both water and air together, not to either one alone. Bottle B has water but lacks air exposure, so no rust develops, proving both conditions are essential.

Question: In the context of the chapter, what makes gold and silver more valuable than other metals for applications like decorative foil and jewelry?
A. They are harder and stronger than all other metals
B. They possess exceptional malleability and ductility, allowing them to be beaten into extremely thin sheets and drawn into fine wires
C. They are the only metals that conduct heat and electricity
D. They are the only metals that do not corrode or rust in any conditions
Show Answer & Explanation

Answer: (B) They possess exceptional malleability and ductility, allowing them to be beaten into extremely thin sheets and drawn into fine wires

Explanation:
The chapter specifically states that gold and silver are the most malleable and ductile metals, enabling the production of thin foils for decoration and fine wires for jewelry, making these properties key to their premium status.

Question: What does the Iron Pillar of Delhi demonstrate about the relationship between metal properties and human technological advancement?
A. Ancient craftspeople did not understand how metals corrode and rust
B. • Skilled ancient metallurgists developed techniques to make iron resist rusting • This shows how understanding and manipulating metal properties enabled structures to survive centuries • It reflects technological expertise developed in India over 1600 years ago
C. Modern metals are superior to those made in ancient times
D. Iron cannot rust under any circumstances if made correctly
Show Answer & Explanation

Answer: (B) • Skilled ancient metallurgists developed techniques to make iron resist rusting • This shows how understanding and manipulating metal properties enabled structures to survive centuries • It reflects technological expertise developed in India over 1600 years ago

Explanation:
The Fascinating Facts section highlights that the Iron Pillar has barely any rust despite 1600 years of exposure to weather, demonstrating that ancient Indian craftspeople possessed sophisticated knowledge of how to manipulate metal properties to prevent corrosion through special manufacturing techniques.

Question: Based on the properties discussed in the chapter, which non-metals would be most suitable for making electrical wires, and why?
A. Oxygen would work because it is essential for respiration
B. None—the chapter indicates that non-metals are poor conductors of electricity, so they are unsuitable for this purpose
C. Sulfur would work because it is soft and flexible
D. Carbon would work because it is found in all living organisms
Show Answer & Explanation

Answer: (B) None—the chapter indicates that non-metals are poor conductors of electricity, so they are unsuitable for this purpose

Explanation:
The chapter clearly establishes that non-metals are poor conductors of electricity in Activity 4.4, making them unsuitable for wiring applications. Only metals like copper and aluminium, which are good conductors, are used for this purpose.

Question: How does the chapter's description of the behavior of materials when beaten or hammered support the classification of substances into metals and non-metals?
A. It shows that hardness alone determines whether something is a metal or non-metal
B. • Metals flatten when hammered, showing malleability • Non-metals break into pieces, showing brittleness • This physical response is one key property distinguishing the two categories of materials
C. It proves that appearance is the most reliable way to classify materials
D. It demonstrates that all materials respond the same way to physical stress
Show Answer & Explanation

Answer: (C) It proves that appearance is the most reliable way to classify materials

Explanation:
Activity 4.1 establishes that the response to hammering—flattening versus breaking—is a fundamental distinguishing property between metals and non-metals, serving as one of several key characteristics that differentiate these two categories of substances.

Question: When an iron nail is placed in a glass bottle with dry air and silica gel but no water, what observation can you expect after 8-10 days?
A. The nail becomes completely covered in rust.
B. The nail shows no significant brown deposits.
C. The nail turns black due to oxidation.
D. The nail becomes extremely brittle and breaks easily.
Show Answer & Explanation

Answer: (B) The nail shows no significant brown deposits.

Explanation:
Activity 4.5 demonstrates that brown deposits form only when iron is exposed to both water and air together. In bottle A, where the nail sits in dry air (the silica gel removes moisture), no rust develops because water is absent. Rust requires the presence of moist air — both oxygen and water are essential for the process.

Question: Gold is described as exceptionally malleable, with one gram being drawable into a 2-kilometre-long wire. Which property does this long wire represent?
A. Sonority
B. Brittleness
C. Ductility
D. Malleability
Show Answer & Explanation

Answer: (C) Ductility

Explanation:
Ductility is the ability to be drawn into wires, while malleability is the ability to be flattened into sheets. The chapter clearly states that gold's capacity to form a very long wire from just one gram illustrates ductility, not malleability—these are two distinct properties.

Question: According to the textbook, which of the following is NOT listed as a method for preventing iron from rusting?
A. Painting the surface
B. Applying a protective layer of zinc
C. Treating it with oiling or greasing
D. Submerging it permanently in water
Show Answer & Explanation

Answer: (D) Submerging it permanently in water

Explanation:
The chapter explicitly mentions painting, oiling, greasing, and galvanisation (applying zinc) as rust prevention methods. Submerging iron permanently in water would actually be counterproductive—Activity 4.5 shows that water is one of the two ingredients necessary for rust formation, so continuous exposure to water accelerates rusting rather than preventing it.

Question: When sulfur burns in air and the resulting gas dissolves in water, what type of solution is formed, and how would it affect litmus paper?
A. A basic solution that turns red litmus paper blue
B. An acidic solution that turns blue litmus paper red
C. A neutral solution that produces no colour change
D. An alkaline solution with no effect on either litmus paper
Show Answer & Explanation

Answer: (B) An acidic solution that turns blue litmus paper red

Explanation:
Activity 4.7 shows that burning sulfur produces sulfur dioxide gas. When this gas dissolves in water, it forms sulfurous acid. The chapter confirms this solution is acidic, turning blue litmus paper red—the opposite of what happens with metal oxides, which are basic.

Question: Based on the distinctions made in the chapter, which property is characteristic of most non-metals but NOT typical of metals?
A. Good conductivity of electricity
B. Lustrous appearance with a shiny surface
C. Lack of malleability and ductility
D. Ability to be drawn into long wires
Show Answer & Explanation

Answer: (C) Lack of malleability and ductility

Explanation:
The chapter establishes that non-metals are neither malleable (cannot be beaten into sheets) nor ductile (cannot be drawn into wires). This is a defining contrast—metals exhibit both these properties, while non-metals do not. Options a, b, and d are properties associated with metals, not non-metals.

Question: In the context of the chapter, what is the key difference between corrosion and rusting?
A. Rusting affects only iron, while corrosion affects only non-metals.
B. Corrosion is the general term for metal surface degradation, while rusting specifically refers to iron's deterioration.
C. Rusting occurs only in water, while corrosion occurs only in air.
D. Corrosion produces rust, which then causes additional rusting.
Show Answer & Explanation

Answer: (B) Corrosion is the general term for metal surface degradation, while rusting specifically refers to iron's deterioration.

Explanation:
The chapter defines rusting as the formation of rust on iron objects. Corrosion is presented as the broader term—gradual deterioration of any metal surface caused by air, water, or other substances. Examples include the green coating on copper and black coating on silver, neither of which are called rust.

Question: If you were to conduct Activity 4.4 using a piece of plastic and a piece of rubber, what would you observe, and what would this tell you about these materials?
A. The bulb would glow brightly, showing these are excellent conductors.
B. The bulb would not glow, but this would still classify them as non-metals.
C. The bulb would not glow, but the chapter clarifies they are not classified as metals or non-metals at all.
D. The bulb would flicker dimly, proving they are poor conductors of electricity.
Show Answer & Explanation

Answer: (C) The bulb would not glow, but the chapter clarifies they are not classified as metals or non-metals at all.

Explanation:
The chapter explicitly states that plastic, glass, wood, rubber, and paper are not classified as metals or non-metals because they are not elements. While they behave like poor conductors (the bulb would not glow), this does not make them non-metals. The distinction is based on elemental composition, not just conductivity alone.

Question: The Iron Pillar of Delhi has remained largely rust-free for over 1600 years despite exposure to wind, rain, and harsh weather. What does this primarily demonstrate?
A. Iron naturally becomes more resistant to rust as it ages.
B. Ancient Indians understood metalworking techniques that could protect iron from corrosion.
C. The dry climate of Delhi prevents all rusting regardless of metal treatment.
D. Modern methods of rust prevention were already being used during Chandragupta II's reign.
Show Answer & Explanation

Answer: (B) Ancient Indians understood metalworking techniques that could protect iron from corrosion.

Explanation:
The chapter presents this pillar as evidence of advanced skills in metal technology during ancient India. The pillar's remarkable durability despite 1600 years of exposure to moisture and air indicates that the craftspeople had developed effective methods to resist rusting. This is offered as a 'fascinating fact' highlighting technological sophistication, not as an example of natural aging or climate advantage.

Question: Based on the properties outlined in the chapter, why would carbon be considered essential for life, while a metal like copper would not be equally essential to all living organisms?
A. Copper is more malleable and therefore more useful for tools than carbon.
B. Carbon is a building block of all life forms and a key component of proteins, fats, and carbohydrates, whereas copper is mainly useful for human tools and applications.
C. Both are equally essential, but the chapter simply emphasizes carbon more.
D. Carbon conducts electricity better than copper and is therefore more vital.
Show Answer & Explanation

Answer: (B) Carbon is a building block of all life forms and a key component of proteins, fats, and carbohydrates, whereas copper is mainly useful for human tools and applications.

Explanation:
Section 4.5 explicitly states that carbon is essential because it is the building block of all life forms and a key component of molecules necessary for growth and energy. Copper, while valuable for human applications, is not a fundamental component of living matter in the way carbon is.

Question: When Sudarshan heats iron and beats it into shape, he relies on which combination of iron's properties to accomplish this task?
A. Malleability alone, which allows the iron to be flattened.
B. Ductility and sonority, which allow drawing and sound production.
C. Malleability and the property that metals can be shaped when heated and softened.
D. Conductivity of heat and lack of brittleness.
Show Answer & Explanation

Answer: (C) Malleability and the property that metals can be shaped when heated and softened.

Explanation:
The chapter describes how an iron block becomes red hot in the furnace and then can be beaten into an axe. This process depends on malleability—the ability to be beaten into desired shapes. Additionally, heating the iron temporarily reduces its brittleness and makes it more pliable, a concept reinforced by Sudarshan's deliberate use of heat before hammering. The combination of malleability and heat-assisted shaping enables toolmaking.

Question: In Activity 4.3, when a metal spoon and a wooden spoon are both placed in hot water for the same duration, the metal spoon becomes hotter to touch. What concept does this experiment primarily illustrate about the difference between these two materials?
A. Metal is always harder than wood
B. Metals transfer heat more readily through their structure than wood does
C. Wood is a better insulator than metal
D. Heat only flows through metals but not through wood
Show Answer & Explanation

Answer: (B) Metals transfer heat more readily through their structure than wood does

Explanation:
The experiment demonstrates that when both spoons are immersed in water of the same temperature, the metal spoon conducts heat along its length much more efficiently than the wooden spoon, resulting in a hotter upper end. This shows metals are good conductors of heat while wood is a poor conductor.

Question: When phosphorus is stored in water according to the chapter, but sulfur can remain in contact with water without reacting, what does this reveal about how different non-metals respond to their environment?
A. Phosphorus and sulfur are both metals that require special storage
B. Non-metals behave uniformly in all conditions and have identical chemical properties
C. Individual non-metals have distinct reactivity patterns; phosphorus ignites in air while sulfur remains chemically inactive in water
D. Water is unsafe for storing any non-metal substance
Show Answer & Explanation

Answer: (C) Individual non-metals have distinct reactivity patterns; phosphorus ignites in air while sulfur remains chemically inactive in water

Explanation:
• Phosphorus is stored in water specifically because it reacts vigorously with atmospheric oxygen and would catch fire if exposed to air
• Sulfur, in contrast, shows no reaction when placed in water, demonstrating that different non-metals have different chemical behaviors
• This distinction shows that non-metals, despite sharing certain common properties like being poor conductors, do not all behave identically in the same conditions

Free study material for Science

Practice MCQs for Class 7 Science Chapter 04 The World Of Metals And Non Metals

Download Multiple Choice Questions: Chapter 04 The World Of Metals And Non Metals (Class 7 Science)

Explore reliable practice questions for Chapter 04 The World Of Metals And Non Metals tailored for Class 7 Science learners. Use these multiple-choice formats to evaluate preparedness and strengthen problem-solving skills.

Concept Clarification for Chapter 04 The World Of Metals And Non Metals

Built using the official NCERT book for Class 7, these Science objective sets provide reliable academic guidance. Pair your practice with our recommended NCERT solutions to master optimal problem-solving approaches.

Additional Study Resources for Class 7 Science

Explore our broader library of printable assignments, chapter notes, and mock tests designed to support continuous revision and secure higher marks in CBSE assessments.

FAQs

Where can I access latest CBSE Class 7 Science Chapter 04 The World Of Metals And Non Metals MCQs Set 01?

You can get most exhaustive CBSE Class 7 Science Chapter 04 The World Of Metals And Non Metals MCQs Set 01 for free on StudiesToday.com. These MCQs for Class 7 Science are updated for the 2026-27 academic session as per CBSE examination standards.

Are Assertion-Reasoning and Case-Study MCQs included in the Science Class 7 material?

Yes, our CBSE Class 7 Science Chapter 04 The World Of Metals And Non Metals MCQs Set 01 include the latest type of questions, such as Assertion-Reasoning and Case-based MCQs. 50% of the CBSE paper is now competency-based.

How do practicing Science MCQs help in scoring full marks in Class 7 exams?

By solving our CBSE Class 7 Science Chapter 04 The World Of Metals And Non Metals MCQs Set 01, Class 7 students can improve their accuracy and speed which is important as objective questions provide a chance to secure 100% marks in the Science.

Do you provide answers and explanations for CBSE Class 7 Science Chapter 04 The World Of Metals And Non Metals MCQs Set 01?

Yes, Science MCQs for Class 7 have answer key and brief explanations to help students understand logic behind the correct option as its important for 2026 competency-focused CBSE exams.

Can I practice these Science Class 7 MCQs online?

Yes, you can also access online interactive tests for CBSE Class 7 Science Chapter 04 The World Of Metals And Non Metals MCQs Set 01 on StudiesToday.com as they provide instant answers and score to help you track your progress in Science.