Matter and its composition Quiz - ICSE Class 7 Science

Free practice quiz: Matter and its composition (ICSE Class 7 Science). 50 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This ICSE Class 7 Science practice quiz has 50 multiple-choice questions on Matter and its composition, and 50 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. Which of the following describes a substance that cannot be broken down into simpler substances by chemical means?

   1. Compound
   2. Mixture
   3. Element
   4. Molecule
   Show answer

   Answer: C. Element

   An element is a pure substance consisting only of atoms that all have the same number of protons in their atomic nuclei. It cannot be broken down into simpler substances by ordinary chemical means.

2. Evaporation is a suitable method for separating a soluble solid from a liquid. Which of the following is an example of this?

   1. Separating sand from water
   2. Separating salt from water
   3. Separating iron filings from sulfur
   4. Separating oil from water
   Show answer

   Answer: B. Separating salt from water

   When salt is dissolved in water, it forms a homogeneous mixture. Evaporation of water leaves the solid salt behind.

3. The change of state from a solid to a liquid is known as:

   1. Freezing
   2. Melting
   3. Boiling
   4. Sublimation
   Show answer

   Answer: B. Melting

   Melting, or fusion, is a physical process that results in the phase transition of a substance from solid to liquid.

4. What is a molecule?

   1. A single atom
   2. A positively charged ion
   3. The smallest particle of a compound that retains its chemical properties
   4. A mixture of elements
   Show answer

   Answer: C. The smallest particle of a compound that retains its chemical properties

   A molecule is an electrically neutral group of two or more atoms held together by chemical bonds. It is the smallest unit of a compound that retains the chemical and physical properties of the compound.

5. Which physical property is exploited when using sieving to separate a mixture of different-sized particles?

   1. Density
   2. Solubility
   3. Particle size
   4. Magnetism
   Show answer

   Answer: C. Particle size

   Sieving works by using a mesh with specific pore sizes. Particles larger than the pores are retained, while smaller particles pass through, thus separating based on size.

More questions in this quiz

Answers and explanations are in the full quiz.

1. What is the smallest unit of an element that retains the chemical properties of that element?
2. A substance formed when two or more different chemical elements are chemically bonded together is called a:
3. Which of the following is an example of a compound?
4. A substance consisting of two or more components not chemically bonded is known as a:
5. Which type of mixture has a uniform composition throughout?
6. In a homogeneous mixture, the components are:
7. Identify a heterogeneous mixture from the given options:
8. Which of the following processes can be used to separate a heterogeneous mixture of iron filings and sulfur powder?
9. What physical property is utilized in distillation to separate components of a liquid mixture?
10. Which separation technique is used to separate insoluble solids from liquids using a filter medium?
11. What is chromatography primarily used to separate?
12. In the solid state, particles are:
13. Liquids have a definite volume but:
14. Which state of matter has particles that are far apart and move randomly at high speeds?
15. The process of a solid changing directly into a gas is called:
16. Condensation is the process where a gas changes into a:
17. What is the term for the change of state from a liquid to a gas?
18. When a liquid changes into a solid, the process is called:
19. Which particle is found in the nucleus of an atom and has a positive charge?
20. Which subatomic particle carries a negative charge?
21. Neutrons are located in the nucleus of an atom and have:
22. The number of protons in an atom's nucleus determines its:
23. What is the mass number of an atom?
24. Atoms of the same element that have different numbers of neutrons are called:
25. An ion is an atom or molecule that has a net electrical charge due to the:
26. A positively charged ion is called a:
27. A negatively charged ion is called an:
28. Which of the following represents a molecule of water?
29. The chemical formula H2SO4 indicates that a molecule of sulfuric acid contains:
30. What does the subscript '3' in the chemical formula CO3²⁻ represent?
31. When elements combine to form a compound, their properties are:
32. Which of the following describes a pure substance?
33. What are the basic building blocks of all matter?
34. Which of the following is an example of an element?
35. When ice melts, it changes from a solid to a liquid. What is the primary change occurring at the molecular level?
36. A scientist is trying to separate a mixture of sand, salt, and iron filings. What would be the most efficient order of separation techniques?
37. The process of 'drying' clothes in the sun is an example of:
38. The fixed ratio of elements in a compound is due to:
39. Which of the following is a characteristic of gases in terms of shape and volume?
40. What is the primary difference between a compound and a mixture?
41. Which state of matter is characterized by particles that are close together but can slide past one another?
42. The process of converting a gas directly to a solid is known as:
43. What subatomic particle is responsible for the chemical behavior of an atom?
44. If an atom loses an electron, it becomes a:
45. The number of protons and neutrons in an atom is approximately equal to its:

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