Metals: 45 MCQs with answers

Malleability

Malleability is the property by which materials can be beaten into thin sheets. Ductility is the ability to be drawn into wires, sonority is the ability to produce a ringing sound, and conductivity is the ability to conduct heat or electricity.

Mercury

Mercury is the only metal that is liquid at room temperature. Sodium and potassium are soft metals but solid at room temperature, and aluminium is a solid metal.

Sonority

Sonority is the property of metals that enables them to produce a ringing sound when struck. Malleability is about beating into sheets, ductility about drawing into wires, and conduction about heat or electricity transfer.

Wood

Wood is a poor conductor of heat, which is why it is used for handles of cooking vessels. Copper, aluminium, and iron are metals and good conductors of heat.

Coal

Coal is non-lustrous, meaning it does not have a shiny appearance. Copper, aluminium, and iron are metals and exhibit metallic lustre.

True

Metals allow electricity to pass through them, making them good conductors. This is why they are used in electrical wiring.

False

Wood is a poor conductor of heat. This is why it is used for handles of cooking vessels to prevent heat from transferring to the hand.

Ductility

Ductility is the property that allows metals to be drawn into wires.

Lustre

Lustre refers to the shiny appearance that metals exhibit.

Malleability

Malleability is the property that allows metals to be hammered into thin sheets.

Sonority

Sonority refers to the ability of metals to produce a ringing sound when struck.

Conduction

Conduction is the property that allows metals to efficiently conduct heat and electricity.

Gold

Gold is known for its high malleability, allowing it to be easily shaped.

Ductility

Ductility refers to the ability of metals to be stretched into wires without breaking.

Lustre

Lustre describes the ability of a metal to reflect light, giving it a shiny appearance.

Brittleness

Brittleness is not a property of metals; metals are typically malleable and ductile.

Sonority

Sonority is the property that allows metals to produce a clear ringing sound when struck.

Sodium

Sodium is a metal that is soft enough to be cut with a knife. Iron, copper, and aluminium are harder metals.

Gold

Gold and silver are the most malleable metals. Gold can be beaten into extremely thin sheets. Copper, aluminium, and iron are malleable but not as much as gold.

Sulfur

Sulfur is brittle, meaning it breaks into pieces when beaten. Copper, aluminium, and iron are malleable metals that flatten into sheets.

Ductility

Ductility is the property that allows metals to be drawn into wires. This is why metals like copper and aluminium are used for electrical wiring.

Metal spoon

The metal spoon becomes hotter because metals are good conductors of heat, allowing heat to transfer quickly. Wood is a poor conductor of heat.

Copper

Copper is a metal and a good conductor of electricity. Rubber, wood, and nylon are insulators and do not conduct electricity well.

Ductility

Ductility is the property that allows metals to be stretched into wires without breaking.

Metals are more malleable than brittle

Malleability allows metals to be shaped without breaking, while brittleness indicates a tendency to break easily.

Sonority

Sonority is the property that describes the ability of metals to produce a ringing sound when struck.

Metals have high lustre due to their ability to reflect light

Lustre refers to the shiny appearance of metals, which is due to their ability to reflect light effectively.

Malleability

Malleability is the property that enables metals to be shaped into thin sheets when hammered.

Metals are excellent conductors of heat and electricity

Metals are known for their excellent conductivity of heat and electricity, unlike most non-metals.

Sonority

Sonority is the property that allows metals to produce a clear ringing sound when struck.

It will deform and stretch without breaking

A metal with high ductility can deform and stretch under tensile stress without breaking.

Sonority can be used to identify quality in metal materials

Sonority can help assess the quality of metal materials, which is important in construction.

Some metals are soft and can be cut with a knife.

Some metals like sodium and potassium are soft and can be cut with a knife. Not all metals are hard and solid (mercury is liquid), and metals are generally good conductors of heat.

Silver foil on sweets

Silver foil on sweets is an example of a metal sheet formed due to malleability. Plastic wrap, paper, and rubber are not metals.

Wood

Wood neither flattens into a sheet nor breaks into pieces when beaten, so it is neither malleable nor brittle. Copper and aluminium are malleable, and coal is brittle.

Ductility

Ductility refers to the ability of a metal to be stretched into a wire, which is evaluated during a tensile test where the metal elongates significantly before breaking.

Increasing temperature

Increasing temperature typically leads to increased atomic vibrations, which can impede the flow of electrons, thus decreasing conductivity.

Lustre and Malleability

Malleability is the ability to be hammered into thin sheets, while lustre refers to the shiny appearance that results from the surface finish during the process.

Sonority; due to the close packing of atoms

Sonority is the property that allows metals to produce a ringing sound when struck, which is attributed to the close packing of atoms that facilitates sound wave propagation.

Lead

Lead is known for its high malleability but relatively low ductility, making it suitable for applications where shaping is needed without extensive stretching.

Atomic structure

The atomic structure of a metal influences its ability to reflect light, resulting in lustrous or dull appearances, while other properties do not directly affect lustre.

Ductility; it allows for elongation without breaking

Ductility is the property that allows a metal to be drawn into a wire, enabling elongation without breaking, which is a crucial aspect of its structural integrity.

Copper

Copper is known for its excellent conductivity and sonority, making it a common choice for electrical applications where both properties are advantageous.

Tungsten

Tungsten has a high lustre due to its atomic structure but is also known for its brittleness, resulting in low malleability compared to other metals.

High ductility and high conductivity

High ductility allows the metal to be drawn into wires, while high conductivity ensures efficient electrical transmission, making this combination ideal for wiring applications.