The World of Metals and Non-metals
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Properties of Materials
SubtopicProperties of Materials under The World of Metals and Non-metals for Grade 7 CBSE.
Preview questions (no answers)
- 1.
What is the common name for ?
A.Salt
B.Rust
C.Baking Soda
D.Lime
- 2.
The property of 'Lustre' refers to the ________ of a material.
A.Hardness
B.Shininess
C.Sound
D.Weight
- 3.
Non-metals are used in crackers to produce ________.
A.Sound and light
B.Heat only
C.Water
D.Oxygen
- 4.
Which metal is used in construction, machinery, and vehicles because of its strength?
A.Sodium
B.Iron
C.Mercury
D.Potassium
- 5.
A student adds dilute Hydrochloric acid () to three different test tubes as shown in the setup. A burning matchstick is brought near the mouth of each tube. In which test tube will a gas be produced that burns with a distinct 'pop' sound?
A.Only Test Tube 1
B.Both Test Tube 1 and Test Tube 2
C.Only Test Tube 2
D.All three test tubes
- 6.
A student uses the following flowchart to classify different materials. In which group would you place a material like Copper, which is commonly used to make electrical components and can be drawn into long, thin wires?
A.Group B
B.Group C
C.Group A
D.Group D
- 7.
In an experiment to compare how heat travels through different materials, three rods of equal length and thickness are used: Rod A (Iron), Rod B (Glass), and Rod C (Wood). Each rod has a wax bead attached at the end. Based on the diagram, which observation is most likely correct after the heat source has been on for several minutes?
A.The wax on Rod B will melt first because glass is a transparent non-metal.
B.The wax on Rod A will melt first because metals are much better conductors of heat than non-metals.
C.The wax on Rod C will melt first because wood is an organic material.
D.None of the beads will melt because heat cannot travel through solid materials.
- 8.
In a laboratory experiment, a student observed that a gas produced by the reaction of a metal with dilute acid burned with a 'pop' sound. This indicates the gas is:
A.Oxygen
B.Carbon dioxide
C.Hydrogen
D.Nitrogen dioxide
- 9.
Which of the following metals is used for making ornaments because of its high lustre and high resistance to corrosion?
A.Iron
B.Sodium
C.Platinum
D.Zinc
- 10.
Which of the following properties of metals is used in the manufacture of aluminum foils for wrapping food items?
A.Ductility
B.Malleability
C.Sonority
D.Thermal Conductivity
Download the worksheet for The World of Metals and Non-metals - Properties of Materials to practice offline. It includes additional chapter-level practice questions.
Malleability
SubtopicMalleability under The World of Metals and Non-metals for Grade 7 CBSE.
Preview questions (no answers)
- 1.
Most metals are malleable. Which of these is an exception (liquid metal at room temperature)?
A.Iron
B.Copper
C.Mercury
D.Silver
- 2.
What is the result of hammering a non-metal?
A.It becomes a wire
B.It becomes a sheet
C.It breaks into pieces
D.It becomes shiny
- 3.
Which of the following is a non-malleable solid?
A.Gold
B.Silver
C.Sulfur
D.Aluminum
- 4.
A blacksmith beats a hot iron piece to give it a shape. Which property is he using?
A.Lustre
B.Sonority
C.Malleability
D.Brittleness
- 5.
If you take a piece of graphite and hit it with a hammer, it will:
A.Flatten into a sheet
B.Stretch into a wire
C.Break into small pieces
D.Melt immediately
- 6.
Copper sheets are used for making bottom of cooking vessels. This uses which two properties of copper?
A.Malleability and thermal conductivity
B.Ductility and sonorousness
C.Brittleness and lustre
D.Hardness and transparency
- 7.
Why can't we make thin sheets of wood?
A.Wood is too expensive
B.Wood is a metal
C.Wood is not malleable and will break or split
D.Wood is a liquid
- 8.
A student claims that 'all solids are malleable'. Which of the following evidence can be used to disprove this claim?
A.Iron can be hammered into sheets.
B.Aluminum foil is used to wrap food.
C.A piece of sulphur crumbles when hit with a hammer.
D.Silver can be used to make thin foils.
- 9.
Malleability is a characteristic property of which group of elements?
A.Noble Gases
B.Halogens
C.Metals
D.Non-metals
- 10.
Which of these metals would be the most difficult to hammer into a thin sheet at room temperature due to its hardness and lower malleability compared to others?
A.Gold
B.Silver
C.Iron
D.Lead
Download the worksheet for The World of Metals and Non-metals - Malleability to practice offline. It includes additional chapter-level practice questions.
Ductility
SubtopicDuctility under The World of Metals and Non-metals for Grade 7 CBSE.
Preview questions (no answers)
- 1.
Which of the following statements is correct?
A.Sulfur is ductile
B.Copper is ductile
C.Coal is ductile
D.Oxygen is ductile
- 2.
The property that allows gold to be used in making thin necklaces is ______.
A.Conductivity
B.Ductility
C.Brittleness
D.Magnetism
- 3.
Which of the following is a non-ductile substance?
A.Copper
B.Aluminum
C.Graphite
D.Gold
- 4.
Wires found in a heater coil are made of metal because they are ______.
A.Brittle
B.Ductile
C.Transparent
D.Non-metals
- 5.
Which of the following represents a property of a non-ductile substance?
A.It can be stretched into a wire
B.It can be bent without breaking
C.It shatters when a tensile force is applied
D.It conducts electricity efficiently
- 6.
Why is lead used in some specific wiring applications despite being less ductile than copper?
A.It is very strong
B.It is very light
C.It is very soft and malleable for specific shapes
D.It is a better conductor than silver
- 7.
Which of these objects relies on the ductility of a metal for its manufacture?
A.A glass bottle
B.A copper coil
C.A wooden chair
D.A plastic ruler
- 8.
Which process is the opposite of the result of ductility (making something long and thin)?
A.Extrusion
B.Compression (making something short and thick)
C.Stretching
D.Tension
- 9.
Which of the following statement groups is entirely correct regarding ductility?
A.Gold is most ductile; Non-metals are brittle; Ductility is a physical property.
B.Silver is a non-metal; Metals are not ductile; Iron is liquid.
C.Ductility is for sheets; Malleability is for wires; Sodium is the most ductile.
D.Mercury is very ductile; Sulfur is a metal; Copper is not ductile.
- 10.
If you have a metal that is very malleable but not very ductile, what can you do with it?
A.Draw it into a long wire easily
B.Hammer it into a thin foil, but it might snap if pulled into a wire
C.It cannot be shaped in any way
D.It will behave like a gas
Download the worksheet for The World of Metals and Non-metals - Ductility to practice offline. It includes additional chapter-level practice questions.
Sonority
SubtopicSonority under The World of Metals and Non-metals for Grade 7 CBSE.
Preview questions (no answers)
- 1.
Which statement is correct?
A.All metals are non-sonorous
B.All non-metals are sonorous
C.Metals are generally sonorous
D.Non-metals are generally sonorous
- 2.
The ability of metals to produce sound is used in making:
A.Tuning forks
B.Erasers
C.Paper
D.Clothes
- 3.
Wind chimes are usually made of metal pipes because metals are:
A.Heavy
B.Sonorous
C.Dull
D.Soft
- 4.
A metal plate and a plastic plate are hit with a stick. Which one rings?
A.Plastic plate
B.Metal plate
C.Both
D.Neither
- 5.
A scientist uses a vibration sensor to classify materials based on their acoustic response after being struck with a mallet. According to the logic in the provided flowchart, which of the following substances would successfully follow the path to be classified as 'C2'?
A.A Carbon rod
B.A Sulfur lump
C.A Zinc plate
D.An Iodine crystal
- 6.
The sound of two silver coins clinking together is a demonstration of:
A.Ductility
B.Lustre
C.Sonority
D.Malleability
- 7.
In the laboratory, you hit an unknown sample and it shatters with a dull thud. The sample is likely a:
A.Metal
B.Non-metal
C.Alloy
D.Coin
- 8.
An engineer is testing four mystery samples (A, B, C, and D) to identify their material categories. She strikes each sample with a metal mallet and records the observations in the flowchart below. Based on the property of sonority, which conclusion correctly identifies the metal and the scientific reason for its behavior?
A.Material A is a metal because the production of a 'dull thud' is a unique characteristic of sonorous elements that are highly dense.
B.Material D is a metal because the property of sonority requires a material to bend or change its shape permanently when struck.
C.Material B is a metal because the 'lasting ring' indicates it is sonorous, meaning it allows vibrations to travel through it with minimal energy absorption.
D.Material C is a non-metal because only non-metals produce sound by shattering into fragments when hit with a force.
- 9.
Which of the following would produce the lowest frequency 'ring'?
A.A small thin silver coin.
B.A large, heavy iron gong.
C.A tiny aluminum foil ball.
D.A thin copper wire.
- 10.
A student finds a mystery element that is shiny, conducts electricity, and is sonorous. What is the element likely to be?
A.A Non-metal
B.A Metal
C.A Noble Gas
D.A Metalloid with no metallic properties
Download the worksheet for The World of Metals and Non-metals - Sonority to practice offline. It includes additional chapter-level practice questions.
Conduction of heat
SubtopicConduction of heat under The World of Metals and Non-metals for Grade 7 CBSE.
Preview questions (no answers)
- 1.
Which of the following items relies on heat conduction to function properly?
A.Solar panel
B.A cooking pan on a stove
C.A radio
D.A mirror
- 2.
A substance through which heat is transferred quickly is a:
A.Thermal insulator
B.Thermal conductor
C.Bad conductor
D.Resistor
- 3.
Which of the following is a common property of metals?
A.They are brittle
B.They are poor conductors
C.They are lustrous (shiny)
D.They are all gases
- 4.
Most non-metals have ______ melting points compared to metals.
A.Higher
B.Lower
C.Same
D.Extreme
- 5.
Which of the following best describes 'thermal equilibrium'?
A.When heat flows from cold to hot
B.When two objects in contact reach the same temperature and no net heat flows
C.When a metal starts melting
D.When an insulator turns into a conductor
- 6.
The handle of a frying pan is made of Bakelite (a type of plastic). Bakelite is used because it is:
A.A good conductor of heat
B.A poor conductor of heat
C.A metal
D.Very heavy
- 7.
Which of the following metals is used for the filament of a light bulb (not primarily for heat conduction, but it must withstand high heat)?
A.Copper
B.Aluminum
C.Tungsten
D.Silver
- 8.
Why is asbestos (a non-metal mineral) used in fireproof suits, even though it is now largely restricted for health reasons?
A.It is a highly efficient conductor that carries heat away from the body.
B.It has extremely low thermal conductivity and a high melting point, acting as an excellent thermal barrier.
C.It is a metal that reflects fire.
D.It converts heat into oxygen for the wearer.
- 9.
When comparing the conduction of heat in solids, liquids, and gases, which statement is most accurate regarding metals?
A.Metals conduct heat slower than gases because they are more dense.
B.Metals conduct heat faster because the particles are closely packed and they have free electrons.
C.Liquids conduct heat faster than metals because they can flow.
D.Gases are the best conductors because their particles move the fastest.
- 10.
If you place a metal ring around a wooden cylinder and heat the ring, it might become tight or loose. However, if the whole setup is heated, why does the wooden cylinder usually start to char at the contact point?
A.The metal ring conducts heat from the source and concentrates it on the wood surface.
B.The wood is a better conductor than the metal ring.
C.The metal ring acts as a cooling agent.
D.Non-metals like wood cannot be heated by metals.
Download the worksheet for The World of Metals and Non-metals - Conduction of heat to practice offline. It includes additional chapter-level practice questions.
Conduction of electricity
SubtopicConduction of electricity under The World of Metals and Non-metals for Grade 7 CBSE.
Preview questions (no answers)
- 1.
In a torch, the metal spring at the bottom helps to:
A.Hold the batteries
B.Complete the electric circuit
C.Make the torch look shiny
D.Both A and B
- 2.
The property due to which metals can be drawn into wires is called __________.
A.Malleability
B.Ductility
C.Conductivity
D.Sonorousness
- 3.
Which metal is typically used in the high-voltage transmission lines we see on towers?
A.Gold
B.Aluminum
C.Lead
D.Mercury
- 4.
If we connect the two ends of a battery with a piece of dry wood, the current will:
A.Flow normally
B.Not flow
C.Flow faster
D.Create a spark
- 5.
Which of the following describes the correct behavior of a 'closed' circuit containing a metal wire?
A.Current flows from the positive terminal to the negative terminal
B.Current stops at the metal wire
C.Current flows only if the wire is made of wood
D.Current flows only if the bulb is broken
- 6.
Why are metals like Copper and Aluminum chosen for power transmission over large distances?
A.They are highly magnetic
B.They have high electrical resistance
C.They have low electrical resistance and are ductile
D.They are very heavy and stay in place
- 7.
In a household circuit, the 'Earth wire' is made of metal to:
A.Stop the electricity from working
B.Provide a low-resistance path for leakage current to the ground
C.Heat up the house during winter
D.Ensure the bulb glows brighter
- 8.
If you were to create a 'Conductivity Scale' for 7th-grade science, which element would be at the extreme 'Good Conductor' end?
A.Sulfur
B.Silver
C.Oxygen
D.Helium
- 9.
Why is the conduction of electricity through a gas (like in a neon sign) much more difficult than through a metal?
A.Gas atoms are too far apart for electrons to jump easily without high voltage.
B.Gases are metals that have been heated too much.
C.Gases do not have any electrons.
D.Gases only conduct in total darkness.
- 10.
Which of the following statements about non-metals is true regarding their interaction with electricity?
A.They are used to make the internal parts of heating elements.
B.They are essential for making insulating handles and coatings.
C.They conduct electricity better at very low temperatures.
D.They are usually found as the positive terminal in a battery.
Download the worksheet for The World of Metals and Non-metals - Conduction of electricity to practice offline. It includes additional chapter-level practice questions.
Effect of Air and Water on Metals: Iron
SubtopicEffect of Air and Water on Metals: Iron under The World of Metals and Non-metals for Grade 7 CBSE.
Preview questions (no answers)
- 1.
Is the formation of rust a reversible or irreversible change?
A.Reversible
B.Irreversible
C.Both
D.Neither
- 2.
The thin layer of Zinc in galvanization protects iron by:
A.Acting as a barrier to air and moisture
B.Changing iron into gold
C.Removing oxygen from the air
D.Heating the iron
- 3.
Which of these is NOT a metal?
A.Iron
B.Zinc
C.Chromium
D.Oxygen
- 4.
What is the chemical symbol for Water?
A.B.C.D. - 5.
Rusting is a process that occurs:
A.Only on the surface of the iron
B.Only inside the iron
C.Both on the surface and then moves deeper as rust flakes off
D.Only at the edges
- 6.
Why does iron not rust in the moon's atmosphere?
A.Because there is no gravity
B.Because there is no oxygen and no water vapor
C.Because the moon is too cold
D.Because the moon's surface is made of iron
- 7.
Which of the following describes 'alloying' as a method to prevent rusting?
A.Applying a layer of paint
B.Mixing iron with other metals or non-metals
C.Dipping iron in molten zinc
D.Keeping iron in a vacuum
- 8.
What is the final color of the substance formed when iron completely reacts with oxygen and water?
A.Silvery grey
B.Bright blue
C.Reddish-brown
D.Golden yellow
- 9.
Which metal can be used for 'cladding' iron to prevent rust, where a layer of the more expensive metal is mechanically bonded to the iron?
A.Sodium
B.Nickel
C.Potassium
D.Calcium
- 10.
Why does a piece of iron rust faster if it is frequently moved from a cold environment to a warm, humid environment?
A.The change in temperature causes the iron to expand and crack.
B.Condensation forms on the cold iron surface when it enters the warm room, providing the necessary moisture.
C.Warm air has more nitrogen which reacts with the iron.
D.The iron loses its magnetism in the heat.
Download the worksheet for The World of Metals and Non-metals - Effect of Air and Water on Metals: Iron to practice offline. It includes additional chapter-level practice questions.
Effect of Air and Water on Other Metals
SubtopicEffect of Air and Water on Other Metals under The World of Metals and Non-metals for Grade 7 CBSE.
Preview questions (no answers)
- 1.
In the chemical reaction of rusting, what role does water play?
A.It acts as a fuel
B.It is an essential reactant
C.It prevents the reaction
D.It turns iron into gold
- 2.
If we leave an iron nail in boiled distilled water with a layer of oil on top, it will:
A.Rust quickly
B.Rust slowly
C.Not rust at all
D.Dissolve in water
- 3.
Which of these metals is protected by a self-formed oxide layer?
A.Iron
B.Sodium
C.Aluminum
D.Potassium
- 4.
Rust is a compound that contains iron and ______.
A.Carbon
B.Oxygen
C.Nitrogen
D.Helium
- 5.
A student conducted an experiment to see how three different metals (, , and ) react with water at various temperatures. She summarized her observations in the following flowchart. Identify the metals , , and based on their reactivity.
A.X: Iron (), Y: Sodium (), Z: Gold ()
B.X: Sodium (), Y: Iron (), Z: Silver ()
C.X: Silver (), Y: Iron (), Z: Sodium ()
D.X: Sodium (), Y: Silver (), Z: Iron ()
- 6.
The reactivity of metals with water follows a specific order. Which metal among these is the most reactive with cold water?
A.Iron
B.Magnesium
C.Sodium
D.Zinc
- 7.
Rusting can be prevented by coating iron with 'tin'. This process is commonly used for:
A.Making car engines
B.Food cans
C.Electric wires
D.Bridge pillars
- 8.
When iron reacts with steam, the gas evolved is:
A.Oxygen
B.Hydrogen
C.Carbon dioxide
D.Steam itself
- 9.
The sacrificial protection of iron by zinc works because:
A.Zinc has a lower melting point than iron.
B.Zinc is more easily oxidized than iron.
C.Iron is more electropositive than zinc.
D.Zinc reacts with iron to form a new metal.
- 10.
Which of these pairs will undergo a reaction when exposed to air and water?
A.Gold and Platinum
B.Silver and Helium
C.Iron and Magnesium
D.Nitrogen and Argon
Download the worksheet for The World of Metals and Non-metals - Effect of Air and Water on Other Metals to practice offline. It includes additional chapter-level practice questions.
Substances that Behave Differently from Metals and Non-metals
SubtopicSubstances that Behave Differently from Metals and Non-metals under The World of Metals and Non-metals for Grade 7 CBSE.
Preview questions (no answers)
- 1.
Zinc is used to coat iron pipes to prevent rusting. This process is called:
A.Malleability
B.Galvanization
C.Oxidation
D.Crystallization
- 2.
Which of the following is the most reactive metal among these?
A.Iron
B.Gold
C.Potassium
D.Copper
- 3.
Which gas makes up about 78% of the Earth's atmosphere?
A.Oxygen
B.Carbon dioxide
C.Nitrogen
D.Argon
- 4.
Aluminum foils are used for wrapping food because aluminum is:
A.Ductile
B.Sonorous
C.Malleable
D.Hard
- 5.
Which of these best describes the position of Noble Gases relative to Metalloids?
A.They are to the left of metalloids
B.They are to the right of metalloids
C.They are in the same rows as metals only
D.They are at the top of the periodic table only
- 6.
Boron compounds are often used in laundry detergents as:
A.Dyes
B.Bleaching agents and water softeners
C.Scents
D.Thickeners
- 7.
What is the physical state of all metalloids at room temperature?
A.Gas
B.Liquid
C.Solid
D.Plasma
- 8.
Based on the Periodic Table position, which of these elements is a metalloid?
A.B.C.D. - 9.
White phosphorus and Red phosphorus are allotropes. How does their behavior toward fire differ?
A.White phosphorus is safer than Red
B.Red phosphorus ignites at a much higher temperature than White phosphorus
C.Both ignite at
D.Neither is flammable
- 10.
Among the Noble Gases, which one is used in the treatment of cancer (radiotherapy)?
A.Helium
B.Argon
C.Radon
D.Xenon
Download the worksheet for The World of Metals and Non-metals - Substances that Behave Differently from Metals and Non-metals to practice offline. It includes additional chapter-level practice questions.
Are Non-metals Essential in Everyday Life?
SubtopicAre Non-metals Essential in Everyday Life? under The World of Metals and Non-metals for Grade 7 CBSE.
Preview questions (no answers)
- 1.
In the context of 'Are Non-metals Essential?', which of the following is true?
A.Only metals are essential for life
B.Non-metals are not important for survival
C.Non-metals like Oxygen and Carbon are the building blocks of life
D.Non-metals are only used in factories
- 2.
Which of these non-metals is used to make fertilizers that provide nutrients to the soil?
A.Oxygen
B.Carbon
C.Phosphorus
D.Helium
- 3.
Which non-metal is present in the proteins of our hair and nails?
A.Sulfur
B.Chlorine
C.Iodine
D.Helium
- 4.
Which non-metal gas is used to produce a very high temperature for welding metals?
A.Nitrogen
B.Hydrogen
C.Argon
D.Helium
- 5.
While Chlorine is commonly used to disinfect water by killing germs, many domestic purifiers also use a specific non-metal in its 'activated' form to adsorb organic pollutants and remove unpleasant smells. Based on the filtration process shown below, identify the non-metal represented by 'X'.
A.Sulphur
B.Carbon
C.Nitrogen
D.Iodine
- 6.
Which non-metal is used in the treatment of goiter, a disease related to the thyroid gland?
A.Chlorine
B.Fluorine
C.Iodine
D.Bromine
- 7.
If you are testing a sample of a non-metal oxide with litmus paper, what would you likely observe?
A.Red litmus turns blue
B.Blue litmus turns red
C.No change in either litmus
D.Both litmus papers turn green
- 8.
Which non-metal is used as a propellant in rockets in its liquid form alongside liquid oxygen?
A.Nitrogen
B.Hydrogen
C.Helium
D.Argon
- 9.
What is the common name for the compound formed when the non-metal Hydrogen reacts with Nitrogen in a 3:1 ratio?
A.Nitric acid
B.Ammonia
C.Nitrous oxide
D.Hydrazine
- 10.
Amorphous carbon, such as 'lamp black', is used in the manufacture of:
A.Jewelry
B.Pencil leads
C.Printer ink and rubber tires
D.Glass cutting tools
Download the worksheet for The World of Metals and Non-metals - Are Non-metals Essential in Everyday Life? to practice offline. It includes additional chapter-level practice questions.