The following 20 Multiple Choice Questions (MCQ) are based on
Chapter 8: Nature of Matter: Elements, Compounds, and Mixtures from the NCERT Class 8
Science textbook Curiosity. Each question has four options - select the
best answer and click to check.
Instructions: Read each question carefully. Choose the most
appropriate option from (a), (b), (c), or (d). Click
Show Answer to reveal the correct answer with explanation.
Multiple Choice Questions
1A mixture forms when substances combine:
(a) Without chemical bonding and retain their properties
(b) Only in a fixed ratio
(c) To form one new element
(d) So they cannot be separated physically
(a) is correct
Mixture components coexist without becoming a new substance.
2The individual substances in a mixture are called its:
(a) Atoms only
(b) Products
(c) Minerals only
(d) Components
(d) is correct
Each component contributes to the mixture and retains characteristic properties.
3Which is a mixture?
(a) Pure copper
(b) Distilled water as a compound
(c) Air
(d) Pure oxygen
(c) is correct
Air contains nitrogen, oxygen and other gases physically mixed.
4Air is considered a mixture because its gases:
(a) Form one element
(b) Are present in variable proportions and retain properties
(c) Are chemically bonded in a fixed formula
(d) Cannot be separated
(b) is correct
The proportions can vary slightly, and the component gases remain distinct substances.
5A homogeneous mixture has:
(a) Uniform composition throughout
(b) Visible separate parts everywhere
(c) Only solid components
(d) A fixed chemical formula
(a) is correct
Every sampled portion has the same composition at the scale considered.
6Which is a heterogeneous mixture?
(a) Salt solution
(b) Air
(c) Brass
(d) Sprout salad
(d) is correct
The different ingredients of a sprout salad remain visibly distinct.
7A pure substance contains:
(a) Only liquids
(b) Only naturally occurring matter
(c) One kind of substance with definite composition
(d) Any number of uncombined materials
(c) is correct
A pure substance is an element or compound with consistent composition and properties.
8Pure substances are broadly classified as:
(a) Metals and mixtures
(b) Elements and compounds
(c) Solutions and suspensions
(d) Solids and gases only
(b) is correct
Elements and compounds are the two main kinds of pure substances.
9An element is a substance that:
(a) Cannot be broken into simpler substances by chemical means
(b) Always contains two elements
(c) Has variable composition
(d) Can be separated by filtration
(a) is correct
All particles of an element are built from the same type of atom.
10Which is an element?
(a) Water
(b) Common salt
(c) Air
(d) Iron
(d) is correct
Iron contains one kind of atom and is represented by the symbol Fe.
11Which symbol represents oxygen?
(a) Og for all oxygen
(b) Oy
(c) O
(d) Ox
(c) is correct
O is the internationally agreed chemical symbol for oxygen.
12Which property is typical of many metals?
(a) They cannot be shaped
(b) They conduct heat and electricity
(c) They are always brittle gases
(d) They never shine
(b) is correct
Metallic elements are generally good conductors and often lustrous and malleable.
13A compound forms when elements:
(a) Chemically combine in a fixed proportion
(b) Are mixed in any proportion
(c) Retain every original property unchanged
(d) Are separated physically
(a) is correct
Chemical bonding produces a new pure substance with definite composition.
14Which is a compound?
(a) Air
(b) Soil
(c) Iron filings mixed with sulphur
(d) Water
(d) is correct
Water contains hydrogen and oxygen chemically combined in a fixed ratio.
15Why is water different from a hydrogen-oxygen mixture?
(a) Water can be separated by simple filtration
(b) Its elements are not bonded
(c) Water has new properties and fixed composition
(d) Water has variable composition
(c) is correct
A compound's properties differ from those of its constituent elements.
16Which method can separate iron filings from sulphur before they react?
(a) Adding more sulphur
(b) Using a magnet
(c) Chemical decomposition only
(d) Evaporating iron
(b) is correct
The mixture retains iron's magnetic property.
17After iron and sulphur react to form iron sulphide, the product:
(a) Has properties different from iron and sulphur
(b) Can be separated with a magnet into the original elements
(c) Has variable composition
(d) Is a mixture
(a) is correct
Chemical reaction forms a new compound with its own properties.
18Which statement correctly compares mixtures and compounds?
(a) Both always have fixed formulae
(b) Mixture components lose all properties
(c) Compounds separate by handpicking
(d) Mixtures have variable composition; compounds have fixed composition
(d) is correct
Mixtures can contain changing proportions, whereas a compound has a definite elemental ratio.
19Minerals are naturally occurring substances found mainly in:
(a) Outer space only
(b) Pure water only
(c) Earth's crust
(d) Only living cells
(c) is correct
Rocks and ores contain naturally occurring minerals with characteristic composition and structure.
20An ore is especially useful because it contains:
(a) A laboratory-made mixture only
(b) Enough valuable material for economical extraction
(c) Only water
(d) No minerals
(b) is correct
An ore is a mineral-bearing material from which a useful substance, often a metal, can be extracted economically.
What is covered in CBSE Class 8 Science Chapter 8 Nature of Matter: Elements, Compounds, and Mixtures?
This chapter covers all key topics from Nature of Matter: Elements, Compounds, and Mixtures as per CBSE 2026-27 syllabus.
Is this MCQ Test useful for CBSE board exams?
Yes, designed for CBSE Class 8 board exam preparation covering the complete syllabus.
Are these CBSE Class 8 Science MCQ Test updated for 2026-27?
Yes, all content at eBookPublisher is updated as per the latest 2026-27 CBSE syllabus.
How many chapters are in CBSE Class 8 Science?
All chapters of CBSE Class 8 Science are covered at eBookPublisher with free MCQ Test for each chapter.
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