The World of Metals and Non metals Class 7 Worksheet with Answers Science Chapter 4

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Class 7 Science Chapter 4 The World of Metals and Non metals Worksheet

Class 7 The World of Metals and Non metals Worksheet

Worksheet On The World of Metals and Non metals Class 7 – The World of Metals and Non metals Worksheet Class 7

A. Objective Type Questions

Multiple Choice Questions

Question 1.
Which of the following is a typical feature of metals?
(a) They are brittle.
(b) They are malleable.
(c) They are poor conductors of heat.
(d) They are soft.
Answer:
(b) They are malleable.

Question 2.
Which of the following is the correct statement about the behaviour of metals?
(a) They catch fire easily.
(b) They are poor conductors of heat.
(c) They produce a ringing sound when struck.
(d) They always float in water.
Answer:
(c) They produce a ringing sound when struck.

Question 3.
Which of the following is a good conductor of electricity?
(a) Sulphur
(b) Wood
(c) Copper
(d) Charcoal
Answer:
(c) Copper

Question 4.
Consider the following statements about the properties of metals and non-metals. Select the correct ones.
I. Metals are malleable and ductile.
II. Non-metals are good conductors of heat.
III. Non-metals are brittle.
IV. Metals are generally shiny.
Choose the correct option:
(a) I, II, and III
(b) II and III
(c) I, III, and IV
(d) II, III, and IV
Answer:
(c) I, III, and IV

Question 5.
Select the incorrect match pair regarding metals and non-metals.
(a) Iron – Metal
(b) Oxygen – Non-metal
(c) Coal – Metal
(d) Sulphur – Non-metal
Answer:
(c) Coal – Metal

Question 6.
Which of the following is not a property of non-metals?
(a) They are brittle.
(b) They are poor conductors of electricity.
(c) They are ductile.
(d) They are not lustrous.
Answer:
(c) They are ductile.

Question 7.
Which of the following is an example of a non-metal?
(a) Aluminium
(b) Sulphur
(c) Zinc
(d) Copper
Answer:
(b) Sulphur

Question 8.
What happens when a metal reacts with oxygen?
(a) A salt is formed
(b) A non-metal is formed
(c) A metal oxide is formed
(d) A base is formed
Answer:
(c) A metal oxide is formed

Question 9.
Which of the following substances is most likely to rust in the presence of air and moisture?
(a) Copper
(b) Iron
(c) Aluminium
(d) Sulphur
Answer:
(b) Iron

Question 10.
Choose the correct option that represents the rusting of iron.
(a) Iron + Oxygen + Water → Rust
(b) Iron + Heat → Iron oxide
(c) Iron + Acid → Rust
(d) Iron + Sunlight → Brown flakes
Answer:
(a) Iron + Oxygen + Water → Rust

Question 11.
Reena kept three samples in bottles: one with dry air, one with water and an oil layer, and one with air and water. Rusting occurred only in the third bottle. What caused the rusting?
(a) Air only
(b) Water only
(c) Both air and water
(d) Heat and sunlight
Answer:
(c) Both air and water

Question 12.
Which substance can be added to prevent the rusting of iron?
(a) Baking soda
(b) Oil or paint coating
(c) Salt
(d) Vinegar
Answer:
(b) Oil or paint coating

Question 13.
What happens when a magnesium ribbon burns in air?
(a) It forms a brown powder.
(b) It forms a white ash of magnesium oxide.
(c) It forms a blue flame.
(d) It forms a black soot.
Answer:
(b) It forms a white ash of magnesium oxide.

Question 14.
The figure shows the results of magnesium oxide and sulfur dioxide solutions with blue litmus papers. Beaker A contains magnesium oxide solution, and Beaker B contains sulphur dioxide solution. What are the respective natures of these oxides?

(a) Acidic, Acidic
(b) Basic, Acidic
(c) Basic, Basic
(d) Neutral, Acidic
Answer:
(b) Basic, Acidic

Question 15.
Which of the following is an example of a use of non-metal in daily life?
(a) Iron nail
(b) Aluminium foil
(c) Oxygen used for breathing
(d) Copper wires
Answer:
(c) Oxygen used for breathing

Fill in the Blanks

Question 1.
Fill in the blanks by choosing the appropriate words from the box given below.

(a) The property of metals to be drawn into wires is called __________________
Answer:
ductility

(b) Metals like copper produce a ringing sound when struck and are said to be __________________
Answer:
sonorous

(c) Non-metals are generally __________________ and do not produce sound when struck.
Answer:
brittle

(d) Metals are good conductors of __________________ and __________________
Answer:
heat, electricity

(e) Aluminium is widely used in electrical wiring because it is a good conductor and __________________ in weight.
Answer:
light

(f) Iron gets covered with a brown flaky substance called __________________ when exposed to air and moisture.
Answer:
rust

(g) Coating iron objects with paint or oil helps to prevent __________________
Answer:
rusting

(h) When magnesium burns in air, it forms a white ash called __________________
Answer:
magnesium oxide

(i) Sulphur dioxide dissolves in water to form an __________________ solution.
Answer:
acidic

(j) Non-metals like oxygen are essential for the process of __________________
Answer:
breathing

True/False

Question 1.
Write ‘T’ for True or ‘F’ for False for the following statements.
(a) Metals are generally hard and have a shiny appearance.
(b) Non-metals can be drawn into wires easily.
(c) Copper and aluminium are commonly used in making electrical wires.
(d) Rusting of iron requires only air and no moisture.
(e) Sulphur dioxide forms a basic solution when dissolved in water.
(f) Non-metals like chlorine and iodine have important uses in our daily life.
Answer:
(a) True

(b) False
Reason: Metals can be drawn into wires easily. This property is called ductility. Non-metals are generally non-ductile.

(c) True

(d) False
Reason: Rusting of iron requires both air (oxygen) and moisture (water).

(e) False
Reason: Sulphur dioxide forms an acidic solution when dissolved in water.

(f) True

Question 2.
Choose the option that shows the correct sequence of True (T) and False (F) statements given below.
(I) Metals are sonorous, which means they produce sound when struck.
(II) Iodine is a non-metal which is used as an antiseptic.
(III) Sulphur is a metal used in the making of electrical wires.
(IV) Gold and silver are highly reactive metals.
(a) TTIT
(b) TTFF
(c) FFFF
(d) FTFT
Answer:
(b) TTFF

Match the following

Question 1.
Match Column I with Column II.

Answer:

Question 2.
Match the images given in Column I with their correct metal present in Column II.

Answer:
(a) (ii)
(b) (i)
(c) (iv)
(d) (iii)

Assertion-Reason Questions

The questions given below consist of an Assertion and a Reason. Based on that, choose the appropriate option.
(a) Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.
(b) Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
(c) The assertion is true, but the Reason is false.
(d) The assertion is false, but the Reason is true.

Question 1.
Assertion: Aluminium is used to make cooking utensils and foils.
Reason: Aluminium is malleable and a good conductor of heat.
Answer:
(a) Aluminium can be beaten into thin sheets (malleable), and it is also a good conductor of heat, which makes it suitable for both utensils and foil. Thus, both assertion and reason are true, and reason is the correct explanation of the assertion.

Question 2.
Assertion: Coal cannot be drawn into wires.
Reason: Coal is brittle and not ductile.
Answer:
(a) Coal is a non-metal. It breaks easily under pressure and cannot be stretched into wires because it lacks ductility. Thus, both assertion and reason are true and reason is the correct explanation of the assertion.

Question 3.
Assertion: Iron objects develop rust when they are exposed to both air and water.
Reason: Rusting is caused by a chemical reaction between iron and carbon dioxide in moist air.
Answer:
(c) Iron rusts when it is exposed to both air and water. Rusting is a chemical process in which iron reacts with oxygen (from air) and water (moisture) to form a brown-coloured substance called iron oxide (rust). Thus, assertion is true, but reason is false.

Question 4.
Assertion: Magnesium oxide turns red litmus paper blue.
Reason: Magnesium oxide is basic in nature.
Answer:
(a) Magnesium forms magnesium oxide on burning. When dissolved in water, it forms a basic solution that turns red litmus paper blue. Thus, both assertion and reason are true and reason is the correct explanation of assertion.

Question 5.
Assertion: Sulphur dioxide turns red litmus blue.
Reason: Sulphur dioxide is an acidic oxide formed when sulphur bums in air.
Answer:
(d) When sulphur burns in air, it forms sulphur dioxide, which dissolves in water to form sulphurous acid. This acid turns blue litmus red, indicating its acidic nature. Thus, assertion is false, but reason is true.

Case Based Question

Rani, a curious Class 7 student, performed an experiment to understand how rusting happens. She took three clean iron nails and placed them in three different bottles, each with a different condition:
Bottle A: Contained dry air only with silica gel to absorb moisture.
Bottle B: Contained boiled water, covered with a thin layer of oil.
Bottle C: Contained tap water and was left open to air.
After 7 days, she observed that only the nail in Bottle C had developed a brown, flaky coating, while the nails in Bottles A and B remained shiny.

Question 1.
What conclusion can you draw from the rusting observed in Bottle C only?
(a) Iron rusts only in dry air.
(b) Iron rusts in water alone.
(c) Iron rusts when both air and water are present.
(d) Iron never rusts in sealed bottles.
Answer:
(c) Iron rusts when both air and water are present.

Question 2.
What is the brown substance seen on the iron nail in Bottle C?
(a) Copper
(b) Rust
(c) Sulphur
(d) Paint
Answer:
(b) Rust

Question 3.
What role did the oil layer in Bottle B play in the experiment?
(a) It helped the nail float in the water.
(b) It prevented air from entering the water.
(c) It made the water cool.
(d) It stopped rust from forming.
Answer:
(b) It prevented air from entering the water.

B. Subjective Type Questions

One Word Questions

Question 1.
Name a metal that is soft and can be cut with a knife.
______________________________________________________

Question 2.
Which metal is used to make foils for wrapping food?
______________________________________________________

Question 3.
Name the most malleable metals.
______________________________________________________

Question 4.
Which property allows metals to be drawn into wires?
______________________________________________________

Question 5.
Which property of wood allows it to be used to make handles of cooking vessels?
______________________________________________________

Question 6.
What do we call the dull, brittle substances that are poor conductors of heat?
______________________________________________________

Question 7.
What is the process of formation of green coating on old copper vessel called?
______________________________________________________

Define The Following Terms

Question 1.
Metal
______________________________________________________

Question 2.
Brittleness
______________________________________________________

Question 3.
Sonority
______________________________________________________

Question 4.
Conductor
______________________________________________________

Question 5.
Rusting
______________________________________________________

Question 6.
Galvanisation
______________________________________________________

Question 7.
Alloys
______________________________________________________

Very Short Answer Type Questions

Question 1.
Explain the term ‘malleability’ with one example.
______________________________________________________

Question 2.
Name a metal that is liquid at room temperature.
______________________________________________________

Question 3.
Why are metals like copper and aluminium commonly used for making electrical wires?
______________________________________________________

Question 4.
Form a sentence using the following words:
Good, conductor, are, metals, heat, of, and, electricity.
______________________________________________________

Question 5.
Why does electrician wears rubber gloves while working?
______________________________________________________

Question 6.
Why rusting of iron is considered a chemical change.
______________________________________________________

Question 7.
Why is zinc used to coat iron articles? What is this process called?
______________________________________________________

Question 8.
Name any two metals that does not corrode easily.
______________________________________________________

Question 9.
What is the nature of metallic oxides?
______________________________________________________

Question 10.
State what happens when magnesium is burnt in air. Also, write the nature of the product formed.
______________________________________________________

Short Answer Type Questions

Question 1.
What is ductility, and how does this property of metals make them useful in daily life?
______________________________________________________
______________________________________________________
______________________________________________________

Question 2.
Why are ropes made of metal wires, such as steel, used in suspension bridges and cranes for lifting heavy objects?
______________________________________________________
______________________________________________________
______________________________________________________

Question 3.
Which property is related to metals like those used in ghungroos? Explain.
______________________________________________________
______________________________________________________
______________________________________________________

Question 4.
A student touches different objects – an iron rod, a wooden stick, and a copper wire – and finds that only some of them feel cold. Explain which ones are metals and why they feel cold.
______________________________________________________
______________________________________________________
______________________________________________________

Question 5.
Aluminium utensils are often used for cooking. Give reasons in support of this use.
______________________________________________________
______________________________________________________
______________________________________________________

Question 6.
What is corrosion? Explain with examples from metals like copper and silver.
______________________________________________________
______________________________________________________
______________________________________________________

Question 7.
Complete the following table.

Question 8.
Why is sodium metal stored in kerosene oil instead of being left in the open air?
______________________________________________________
______________________________________________________
______________________________________________________

Question 9.
Yash took some sulphur powder and mixed it with a small amount of water in a glass tumbler. He observed that there was no visible reaction. Later, he read that sulphur is a non-metal and has properties different from metals. He also learned that non-metals like phosphorus are stored in water. State why phosphorus is stored in water?
______________________________________________________
______________________________________________________
______________________________________________________

Question 10.
How is chlorine used in everyday life, and what role does it play in water purification?
______________________________________________________
______________________________________________________
______________________________________________________

Long Answer Type Questions

Question 1.
Riya conducted an activity under adult supervision where she collected a piece of copper, aluminium, an iron nail, coal, sulphur, and wood. She observed their appearance and tested their hardness by hammering each item on a hard surface.

(a) What property of materials was Riya testing using a hammer?
______________________________________________________
______________________________________________________
(b) Which materials from the activity are likely to be classified as metals and why?
______________________________________________________
______________________________________________________
(c) What conclusion can you draw about the appearance of metals and non-metals?
______________________________________________________
______________________________________________________

Question 2.
You are given five materials: a copper wire, a plastic ruler, an iron nail, a piece of coal, and aluminium foil. If each of these is connected in a simple electric circuit one at a time, in which cases will the bulb light up, and in which cases will it not?
______________________________________________________
______________________________________________________
______________________________________________________
______________________________________________________

Question 3.
Iron objects left in the open often get covered with a brown-coloured substance called rust.
(a) What are the conditions required for rusting to take place?
______________________________________________________
______________________________________________________
(b) Write the effects of rusting on iron objects.
______________________________________________________
______________________________________________________
(c) Explain any two methods to prevent rusting of iron.
______________________________________________________
______________________________________________________

Question 4.
Metals and non-metals behave differently when exposed to air and water. Give examples to show how metals and non-metals react differently to air and water.
______________________________________________________
______________________________________________________
______________________________________________________
______________________________________________________

Question 5.
Write any five important uses of non-metals?
______________________________________________________
______________________________________________________
______________________________________________________
______________________________________________________

Skill Based Activities

Question 1.
Unscramble the following jumbled words using the given hints.
(a) LICYTDUI
Hint: Property of metals by which they can be drawn into wires.
(b) NISORYTO
Hint: A property of metals that produces a ringing sound when struck.
(c) NROI
Hint: A commonly used metal in construction and machinery.
(d) CRBONA
Hint: A non-metal used in the form of graphite in pencil lead.
(e) UIRTSGN
Hint: The process by which iron gets damaged due to moisture and air.

Question 2.
Complete the crossword puzzle with the help of the clues given below:

Across
3. Property of metals to be drawn into wires.
4. Metal that bums with a dazzling white flame.
6. A soft, dull, non-metal used in antiseptics.
Down
1. A metal that is used for galvanising iron to prevent rusting.
2. Process where iron reacts with air and moisture to get damaged.
5. Property of metals due to which they produce a ringing sound.

Question 3.
Find the odd one out and justify your answer.
(a) Iron, Copper, Aluminium, Coal
______________________________________________________

(b) Gold, Silver, Sulphur, Aluminium
______________________________________________________
(c) Iodine, Carbon, Paper, Phosphorus
______________________________________________________

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