Nature of Matter: Elements, Compounds, and Mixtures class 8 MCQ

class 8 science

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General Instructions

Your test contains multiple-choice questions with only one answer-type question. There are a total of 10 questions

This is a 20 min test. Please make sure you complete it in the stipulated time
You can finish this test any time using the 'Submit' button.

1. stainless steel is a mixture of

iron, nickel, chromium,carbon

iron and tin

copper and tin

iron and copper

2. What is the smallest unit of an element?

Molecule

atom

cell

compound

3. What is a pure substance?

substance with only one type of particle

any liquid

mixture of water and sugar

None of the above

4. Which of the following best describes a mixture?

Chemically bonded atoms

Uniform composition always

Substances physically combined

Fixed formula

5. An illegal process of adding substances which are cheaper, or of a poor quality, to a product

Adulteration

impurity

chemical reaction

None of the above

6. Which of these is NOT true for a compound?

Its components can be separated by a physical method

Formed by chemical combination

Has different properties from its elements

Has a fixed ratio

7. what is not true of wonder material graphene aerogel?

made of carbon

lightest element

highly porous

None of the above

8. What does the term “alloy” refer to?

Uniform mixture of metals

Compound of gases

New element

Chemical compound

9. which of the following is incorrect?

Pure substance can be either an element or a compound

Substances which are composed of two or more elements combined chemically in a fixed ratio and have different properties from their constituent elements are called compounds

quartz, calcite, mica, pyroxene, and olivine are examples of mineral

none of the above

10. What kind of mixture is sugar solution?

Uniform mixture

Non Uniform mixture

compounds

elements

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