CBSE Class 7 Science Chapter 04 The World Of Metals And Non Metals MCQs Set 03

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Chapter-wise Objective Questions: Chapter 04 The World Of Metals And Non Metals

Navigate directly to the 50 objective questions for Chapter 04 The World Of Metals And Non Metals using the digital viewer below. Each practice set includes verified answer keys, allowing students to instantly cross-check their work and identify areas requiring further revision.

Question: When Sudarshan uncle demonstrates beating a red-hot iron block to shape it into an axe, which property of iron makes this process possible?
A. Ductility, which allows iron to be drawn into wires
B. Malleability, which permits iron to be flattened and shaped without breaking
C. Sonority, which produces a ringing sound when struck
D. Brittleness, which causes it to shatter into manageable pieces
Show Answer & Explanation

Answer: (B) Malleability, which permits iron to be flattened and shaped without breaking

Explanation:
Malleability is the property by which materials can be beaten into thin sheets or new shapes. When the ironsmith heats and hammers the iron, it deforms without breaking, demonstrating this defining characteristic of metals.

Question: In Activity 4.1, when copper and aluminium pieces flatten upon being struck with a hammer while coal and sulfur break into fragments, what term describes the behaviour of coal and sulfur?
A. Malleability
B. Ductility
C. Brittleness
D. Sonority
Show Answer & Explanation

Answer: (C) Brittleness

Explanation:
Materials that break into pieces when hammered are described as brittle. The chapter explicitly states that coal and sulfur do not flatten into sheets but instead shatter, making them brittle rather than malleable.

Question: Based on Activity 4.5, an iron nail kept in a sealed bottle with dry air and silica gel shows no brown deposits after 8–10 days. What does this observation indicate about the conditions necessary for rust formation?
A. Dry air alone is sufficient to cause rusting
B. Water alone, without air, is needed for rust to form
C. Both water and air together are essential for rust to develop
D. Rusting requires only oxygen and cannot occur in sealed containers
Show Answer & Explanation

Answer: (C) Both water and air together are essential for rust to develop

Explanation:
The chapter demonstrates through Activity 4.5 that brown deposits (rust) form only when iron is exposed to both air and water simultaneously. Bottle A with dry air shows no rust, and bottle B with only water shows no rust, but bottle C with both water and air shows rust formation. Moist air, containing both elements, causes rusting.

Question: When a magnesium ribbon burns in air during Activity 4.6, producing a white powder that turns red litmus paper blue when dissolved in water, what property of metal oxides does this reveal?
A. Metal oxides are acidic in nature and turn blue litmus paper red
B. Metal oxides are basic in nature and turn red litmus paper blue
C. Metal oxides are neutral and do not affect litmus paper colour
D. Metal oxides are amphoteric and change colour depending on concentration
Show Answer & Explanation

Answer: (B) Metal oxides are basic in nature and turn red litmus paper blue

Explanation:
The chapter states that metal oxides are generally basic in nature. When magnesium oxide dissolves in water to form a solution, it demonstrates this basic character by changing red litmus paper to blue, which is the characteristic behaviour of basic solutions.

Question: Why does an electrician wear rubber gloves and use tools with plastic or rubber handles when working with electrical equipment?
A. These materials prevent the tool from becoming too hot during use
B. These materials increase the conductivity of electricity for safety
C. These materials are poor conductors of electricity and protect against electric shock
D. These materials reduce the weight of tools for easier handling
Show Answer & Explanation

Answer: (C) These materials are poor conductors of electricity and protect against electric shock

Explanation:
The chapter explains that plastic and rubber are poor conductors of electricity. By using these materials as insulation, electricians prevent current from flowing through their bodies, thus protecting themselves from electric shock.

Question: When sulfur burns in air during Activity 4.7 and the resulting gas dissolves in water, how does the pH of the resulting solution differ from that formed when magnesium burns?
A. Both produce basic solutions that turn red litmus paper blue
B. Burning sulfur produces an acidic solution while magnesium produces a basic solution
C. Burning sulfur produces a neutral solution while magnesium produces a basic solution
D. Both produce acidic solutions that turn blue litmus paper red
Show Answer & Explanation

Answer: (B) Burning sulfur produces an acidic solution while magnesium produces a basic solution

Explanation:
• Magnesium burns to form magnesium oxide, which produces a basic solution (turns red litmus blue)
• Sulfur burns to form sulfur dioxide, which dissolves in water to form sulfurous acid (acidic solution)
• Metal oxides are basic while non-metal oxides are acidic—a key distinction in the chapter.

Question: Why is sodium metal stored in kerosene rather than in dry air or water?
A. Kerosene prevents sodium from oxidising but allows controlled reactions
B. Sodium reacts vigorously with both oxygen and water, and kerosene prevents exposure to these substances
C. Kerosene increases the melting point of sodium, making it safer to handle
D. Kerosene is an excellent conductor and protects sodium from electrical damage
Show Answer & Explanation

Answer: (B) Sodium reacts vigorously with both oxygen and water, and kerosene prevents exposure to these substances

Explanation:
The chapter explicitly states that sodium reacts vigorously with oxygen and water, generating considerable heat. Storing it in kerosene prevents contact with moisture and air, thereby avoiding dangerous reactions.

Question: In Activity 4.3, when both a metal spoon and a wooden spoon are immersed in hot water for the same duration, the metal spoon becomes noticeably hotter to touch. What does this demonstrate about the difference between these materials?
A. Wood is harder and retains heat better than metal
B. Metals are poor conductors of heat compared to wood
C. Metals are good conductors of heat while wood is a poor conductor
D. Heat conduction speed has no relationship to material type
Show Answer & Explanation

Answer: (C) Metals are good conductors of heat while wood is a poor conductor

Explanation:
Heat conducts through the metal spoon quickly, making it hot throughout, while the wooden spoon transfers heat poorly, remaining cooler. This shows metals are good heat conductors and wood is a poor heat conductor, which is why metal vessels are used for cooking while their handles are made from wood or plastic.

Question: Which of the following materials would be most unsuitable for making an electrical wire, and why?
A. Copper, because it is too malleable
B. Coal, because it is a non-metal and poor conductor of electricity
C. Aluminium, because it corrodes easily
D. Iron, because it rusts in moist air
Show Answer & Explanation

Answer: (B) Coal, because it is a non-metal and poor conductor of electricity

Explanation:
The chapter identifies coal as a non-metal that does not conduct electricity. Activity 4.4 shows that non-metals like coal fail to make the bulb glow in an electrical circuit tester, making them unsuitable for electrical wiring, which requires good electrical conductivity.

Question: What is the primary distinction between metals and non-metals based on the appearance property discussed in the chapter?
A. Metals are harder while non-metals are softer
B. Metals show metallic lustre while most non-metals are non-lustrous
C. Metals are heavier while non-metals are lighter
D. Metals are transparent while non-metals are opaque
Show Answer & Explanation

Answer: (B) Metals show metallic lustre while most non-metals are non-lustrous

Explanation:
The chapter defines metallic lustre as the shine shown by metals like copper, aluminium, and iron. In contrast, non-metals such as coal, sulfur, and wood are explicitly described as non-lustrous, lacking this characteristic shiny appearance.

Question: Based on the text, why is one gram of gold described as capable of being drawn into a 2-kilometre-long wire?
A. Gold has exceptional malleability that allows it to be hammered into sheets
B. Gold possesses extreme ductility, enabling it to be stretched into very fine wires
C. Gold has low density, making it extremely light and easy to stretch
D. Gold conducts electricity at very high efficiency
Show Answer & Explanation

Answer: (B) Gold possesses extreme ductility, enabling it to be stretched into very fine wires

Explanation:
Ductility is the property that allows materials to be drawn into wires. The chapter highlights gold's exceptional ductility, stating this property is what enables such extraordinary wire-drawing capability.

Question: When phosphorus is stored in water to prevent it from catching fire, but sulfur can remain in contact with water without reacting, what does this reveal about non-metals?
A. All non-metals react vigorously with water in the same way
B. Different non-metals exhibit different chemical behaviours and reactivities
C. Non-metals never react with water under any circumstances
D. Water is the best storage medium for all non-metals
Show Answer & Explanation

Answer: (B) Different non-metals exhibit different chemical behaviours and reactivities

Explanation:
Phosphorus catches fire when exposed to air, so storing it in water prevents this dangerous reaction. Sulfur, however, does not react with water at all. This difference demonstrates that non-metals, like metals, vary significantly in their chemical properties and behaviours with other substances.

Question: How would a material be classified if it becomes flattened when struck with a hammer but does not allow electricity to pass through it easily?
A. It must be a metal because it shows malleability
B. It must be a non-metal because it does not conduct electricity
C. It could be either a metal or a non-metal; conductivity and malleability are independent properties
D. It cannot be classified into either category based on these properties alone
Show Answer & Explanation

Answer: (C) It could be either a metal or a non-metal; conductivity and malleability are independent properties

Explanation:
The chapter presents malleability and electrical conductivity as separate properties. While most metals exhibit both properties, the chapter shows that a material could theoretically display one property without the other. These are distinct characteristics, not dependent on each other.

Question: In Activity 4.4, when materials are tested in a simple electrical tester circuit, all the materials that cause the bulb to glow are identified as metals. What does this consistent pattern indicate?
A. Only metals can conduct electricity under any circumstances
B. Most metals are good conductors of electricity, while non-metals generally are not
C. There is no correlation between a material being a metal and its ability to conduct electricity
D. Non-metals conduct electricity better than metals in experimental settings
Show Answer & Explanation

Answer: (B) Most metals are good conductors of electricity, while non-metals generally are not

Explanation:
The chapter shows that aluminium, iron, and copper (all metals) make the bulb glow, while sulfur, coal, wood, stone, rubber, and nylon do not. This pattern establishes that metals are generally good conductors of electricity while non-metals are generally poor conductors, though the chapter acknowledges this is a general trend rather than an absolute rule.

Question: What inference can be made about why heating is necessary when an ironsmith shapes iron into tools, as described in the chapter?
A. Heating changes iron into a non-metal that is easier to shape
B. Heating increases the malleability of iron, allowing it to be deformed into desired shapes without breaking
C. Heating is necessary only to make the iron visible while shaping
D. Heating hardens the iron so it can withstand hammer blows
Show Answer & Explanation

Answer: (B) Heating increases the malleability of iron, allowing it to be deformed into desired shapes without breaking

Explanation:
The chapter demonstrates through Sudarshan uncle's work that heating iron makes it more workable. When heated to red-hot, the iron becomes more malleable and can be beaten into shape without fracturing. This heating temporarily increases the material's ability to be shaped—a practical application of malleability.

Question: In Activity 4.1, when objects are struck with a hammer, materials such as copper and aluminium flatten, while coal and sulfur break into pieces. Which term best describes the behaviour exhibited by coal and sulfur?
A. a) Malleability
B. b) Brittleness
C. c) Ductility
D. d) Sonority
Show Answer & Explanation

Answer: (B) b) Brittleness

Explanation:
The chapter explicitly states that materials like coal and sulfur break into pieces when hammered and are said to be brittle. Brittleness is the property that causes a material to shatter or fracture rather than deform when struck.

Question: During Activity 4.5, an iron nail placed in a sealed bottle containing only dry air and silica gel shows no brown deposits after 8–10 days. What does this observation specifically demonstrate about the conditions required for rust formation?
A. a) Only air is necessary for rust to form
B. b) Only water is necessary for rust to form
C. c) Both air and water are essential for rust to develop
D. d) Rust forms regardless of environmental conditions
Show Answer & Explanation

Answer: (C) c) Both air and water are essential for rust to develop

Explanation:
The experiment reveals that moist air—the combination of both water and air—is responsible for rust formation. When the iron nail is kept in dry air alone (bottle A) or in water alone with an oil barrier preventing air contact (bottle B), no rust develops. Only in bottle C, where both air and water are present, does the brown deposit form.

Question: When magnesium ribbon burns in air during Activity 4.6, the white powder formed (magnesium oxide) dissolves in water and turns red litmus paper blue. What does this behaviour reveal about metal oxides?
A. a) Metal oxides are always acidic in nature
B. b) Metal oxides are basic in nature
C. c) Metal oxides are neutral in nature
D. d) Metal oxides have no effect on litmus paper
Show Answer & Explanation

Answer: (B) b) Metal oxides are basic in nature

Explanation:
The chapter states that generally, oxides of metals are basic in nature. The observation that the magnesium oxide solution turns red litmus paper blue confirms this—blue litmus turning from red indicates a basic or alkaline solution.

Question: When sulfur burns in air and the resulting gas dissolves in water during Activity 4.7, how does the nature of the solution formed compare to that produced when magnesium burns?
A. a) Both form basic solutions
B. b) Both form acidic solutions
C. c) Magnesium forms a basic solution while sulfur forms an acidic solution
D. d) Magnesium forms an acidic solution while sulfur forms a basic solution
Show Answer & Explanation

Answer: (C) c) Magnesium forms a basic solution while sulfur forms an acidic solution

Explanation:
• Magnesium burns to form magnesium oxide, which is basic (turns red litmus blue)\n• Sulfur burns to form sulfur dioxide, which dissolves in water to make sulfurous acid (acidic)\n• The chapter distinguishes: metals produce basic oxides, while non-metals produce acidic oxides

Question: Why are rubber and plastic materials specifically chosen for electrician gloves and tool handles, according to the principles discussed in the chapter?
A. a) They are more durable than metal
B. b) They are poor conductors of electricity and protect against electric shock
C. c) They are lustrous and visually appealing
D. d) They can be easily shaped into any form
Show Answer & Explanation

Answer: (B) b) They are poor conductors of electricity and protect against electric shock

Explanation:
The chapter explains that materials preventing electricity from flowing through them are called poor conductors of electricity. Rubber and plastic are poor conductors, so they insulate electricians from electric shock when working with live electrical equipment.

Question: The Iron Pillar of Delhi has remained nearly rust-free for over 1600 years despite continuous exposure to wind, rainfall, and intense weather. What does this historical structure primarily demonstrate?
A. a) Iron does not rust under any circumstances
B. b) Ancient iron was chemically different from modern iron
C. c) Advanced metallurgical techniques can be used to create rust-resistant iron
D. d) Weather conditions in Delhi are not conducive to rusting
Show Answer & Explanation

Answer: (C) c) Advanced metallurgical techniques can be used to create rust-resistant iron

Explanation:
The chapter's "Fascinating Facts" section notes that the pillar has been made in a way that resists rusting, illustrating the skills developed in metal technology in ancient India. This demonstrates that through careful craftsmanship and metallurgical knowledge, iron can be treated or composed to resist the normal rusting process.

Question: In Activity 4.4, when various materials are tested in an electrical circuit tester, all materials that make the bulb glow are identified as metals, while coal, wood, stone, rubber, and nylon do not cause the bulb to glow. What consistent pattern does this activity reveal?
A. a) Only metals can conduct heat
B. b) Metals and non-metals conduct electricity equally well
C. c) Metals are good conductors of electricity while non-metals are generally poor conductors
D. d) Coal is a metal because it conducts some electricity
Show Answer & Explanation

Answer: (C) c) Metals are good conductors of electricity while non-metals are generally poor conductors

Explanation:
The observation demonstrates a clear distinction: all materials that allow electricity to flow through them (making the bulb glow) are metals, classified as good conductors of electricity. All non-metals tested failed to conduct electricity and are classified as poor conductors. This pattern shows an alignment between material classification and electrical conductivity.

Question: When Sudarshan uncle heats an iron block until it becomes red hot and then beats it with a hammer to shape it into an axe, which combination of properties enables this process to work?
A. a) Malleability alone
B. b) Ductility and sonority
C. c) Malleability combined with the effect of heating
D. d) Brittleness and hardness
Show Answer & Explanation

Answer: (C) c) Malleability combined with the effect of heating

Explanation:
Heating the iron makes it more workable. When heated, iron becomes malleable enough to be beaten into a desired shape. Malleability is the property allowing the material to be flattened or shaped by hammering. The heating is necessary because it temporarily enhances the metal's workability for the shaping process.

Question: Phosphorus is stored in water to prevent it from catching fire when exposed to air, yet sulfur can safely remain in open contact with water without reacting. What does this contrast reveal about non-metals?
A. a) All non-metals behave identically with water
B. b) Non-metals vary significantly in their chemical reactivity with air and water
C. c) Sulfur is more reactive than phosphorus
D. d) Non-metals are more reactive than metals with water
Show Answer & Explanation

Answer: (B) b) Non-metals vary significantly in their chemical reactivity with air and water

Explanation:
Phosphorus's requirement for water storage and sulfur's inert behaviour with water demonstrate that non-metals do not all behave the same way. Different non-metals exhibit different levels of chemical reactivity. The chapter notes phosphorus reacts vigorously with oxygen and water, while sulfur shows no reaction when placed in water, illustrating the diversity of non-metal properties.

Question: Based on the properties described in the chapter, which statement best explains why metals are typically chosen for making cooking vessels rather than non-metals like coal or wood?
A. a) Metals are more durable because they are harder
B. b) Metals are good conductors of heat and can withstand high temperatures, while non-metals are poor heat conductors
C. c) Non-metals produce toxic fumes when heated
D. d) Metals are less expensive than non-metals
Show Answer & Explanation

Answer: (B) b) Metals are good conductors of heat and can withstand high temperatures, while non-metals are poor heat conductors

Explanation:
Activity 4.3 demonstrates that metals conduct heat effectively—the metal spoon becomes much hotter than the wooden spoon in the same hot water. The chapter states that metals are good conductors of heat, making them ideal for cooking vessels. Additionally, metal handles are made with wood or other materials precisely because those materials are poor heat conductors, protecting the user's hand.

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