Science Practice Quiz 174

Q1.What is the process called when large crystals of pure substances are formed from their solutions?

A. Evaporation B. Sublimation C. Crystallisation D. Condensation

Q2.Crystallisation is an example of which type of change?

A. Chemical change B. Biological change C. Physical change D. Nuclear change

Q3.What is a characteristic of salt obtained by the evaporation of sea water?

A. It is always pure and has well-defined crystals B. It is not pure and its crystals cannot be seen clearly C. It is used directly for industrial purposes without further purification D. It is a chemical change

Q4.Stainless steel is made by mixing iron with carbon and which other metals?

A. Copper, zinc, and tin B. Aluminium, titanium, and cobalt C. Chromium, nickel, and manganese D. Lead, silver, and gold

Q5.What is a key property of stainless steel mentioned in the text?

A. It is highly corrosive B. It is a poor conductor of electricity C. It does not rust D. It is lighter than pure iron

Q6.In the activity described for forming copper sulphate crystals, what is added to water before heating?

A. Concentrated hydrochloric acid B. Sodium chloride solution C. Dilute sulphuric acid D. Copper powder

Q7.According to the provided text, how many primary types of changes are discussed?

A. Two B. Three C. Four D. Five

Q8.Which of the following is a characteristic of physical changes?

A. New substances are always formed. B. These changes are always irreversible. C. They involve changes in the physical properties of substances. D. They always result in a chemical reaction.

Q9.What is the key outcome of chemical changes, according to the provided information?

A. Only the physical state of a substance changes. B. No new substances are formed. C. New substances are produced. D. The change is always reversible.

Q10.From which process can some substances be obtained in a pure state from their solutions?

A. Galvanisation B. Rusting C. Crystallisation D. Photosynthesis

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Science Practice Quiz 174