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P.6 Topic 9: Science at Home and in Our Community Quiz

6 Standard National Curriculum Questions • Immediate Millisecond Evaluation • Official UNEB Rationales

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Question: 1 / 6

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P.6 • Topic 9 Question 1 of 6

1 Mark • UNEB Standard

Why is water obtained through distillation not recommended for domestic drinking?

💡 UNEB Examiner Insight & Textbook Rationale

Distilled water is completely pure H2O without dissolved mineral salts (like calcium, sodium, and magnesium) that are vital for maintaining human health.

P.6 • Topic 9 Question 2 of 6

1 Mark • UNEB Standard

What is the primary scientific role of charcoal in a simple domestic water filter?

💡 UNEB Examiner Insight & Textbook Rationale

Charcoal is highly porous and uses the physical property of adsorption to trap bad odors, unpleasant tastes, and dissolved chemicals.

P.6 • Topic 9 Question 3 of 6

1 Mark • UNEB Standard

Why should woolen sweaters be gently squeezed instead of being wrung (twisted) when washing?

💡 UNEB Examiner Insight & Textbook Rationale

Wool consists of delicate animal protein fibers that easily stretch, warp, and snap when wrung with force.

P.6 • Topic 9 Question 4 of 6

1 Mark • UNEB Standard

In the traditional preparation of local salt from plant ash, what scientific name is given to the liquid that passes through the banana leaf sieve?

💡 UNEB Examiner Insight & Textbook Rationale

The clear liquid that passes through a filter medium is called the filtrate, while the insoluble solid ash left behind is the residue.

P.6 • Topic 9 Question 5 of 6

1 Mark • UNEB Standard

Which stage in municipal water treatment involves adding alum to group floating dirt particles together?

💡 UNEB Examiner Insight & Textbook Rationale

Coagulation involves adding alum (aluminum sulfate) which binds tiny suspended clay particles into larger clumps that easily sink.

P.6 • Topic 9 Question 6 of 6

1 Mark • UNEB Standard

What is formed when soap is used in hard water instead of a lather?

💡 UNEB Examiner Insight & Textbook Rationale

The calcium and magnesium ions in hard water react with soap to form an insoluble gray precipitate called scum.

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