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.

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
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   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
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   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
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   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
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   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
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   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.

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