Soaps & Detergents — Homi Bhabha Class 6 Chemistry MCQs with Solutions
Free Homi Bhabha Class 6 Chemistry Soaps & Detergents MCQs with step-by-step solutions (10 questions). Part of Materials in Daily Use. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Soaps & Detergents · easy · theory
What is the main job of soap?
A. To remove dirt and grease and clean things ✓ Correct
B. To make clothes dirty
C. To add colour to clothes
D. To keep clothes wet
Solution: Soap helps to loosen and wash away dirt and greasy stains, so its main job is cleaning.
Q2 — Soaps & Detergents · easy · theory
We use soap to wash oily, greasy plates because plain water alone …
A. Cannot wash away grease and oil well ✓ Correct
B. Dissolves oil at once
C. Is itself greasy
D. Makes the plates dirtier
Solution: Oil and grease do not mix with plain water, so water alone cannot clean them well. Soap is needed to help remove the grease.
Q3 — Soaps & Detergents · easy · theory
The cleaning powder or liquid used to wash clothes in a washing machine is called a …
A. Chalk powder
B. Sand
C. Detergent ✓ Correct
D. Sugar
Solution: A detergent is a cleaning agent, often a powder or liquid, used to wash clothes, and it works well in washing machines.
Q4 — Soaps & Detergents · easy · theory
Washing our hands with soap before eating is good because soap helps to …
A. Add germs to the hands
B. Remove the colour of the skin
C. Make the hands dirty
D. Remove germs and keep us healthy ✓ Correct
Solution: Soap washes away dirt and germs from our hands, which helps to keep us healthy and prevent illness.
Q5 — Soaps & Detergents · medium · theory
A soap particle has one end that likes water and another end that likes oil. This helps soap to …
A. Make more oil on the cloth
B. Pull the grease off and mix it into the water so it washes away ✓ Correct
C. Turn the cloth dry
D. Colour the cloth
Solution: The oil-loving end sticks to the grease while the water-loving end holds on to the water, so the grease is lifted off and rinsed away.
Q6 — Soaps & Detergents · medium · theory
Detergents are often better than soap for washing clothes in hard water because detergents …
A. Only work in hard water
B. Turn into scum at once
C. Do not clean anything
D. Still form a good lather even in hard water ✓ Correct
Solution: Unlike soap, detergents lather and clean well even in hard water, so they are better for washing clothes there.
Q7 — Soaps & Detergents · medium · numerical
One bar of soap lasts a family 15 days. How many bars will they need for 45 days?
A. 2
B. 3 ✓ Correct
C. 30
D. 60
Solution: Divide the total days by the days one bar lasts: 45 ÷ 15 = 3 bars.
Q8 — Soaps & Detergents · medium · theory
Which raw material is used to make soap?
A. Rubber and plastic
B. Iron and copper
C. Sand and glass
D. Oils and fats ✓ Correct
Solution: Soap is made by treating natural oils or fats with an alkali, so oils and fats are its main raw material.
Q9 — Soaps & Detergents · hard · theory
Why does soap fail to make a good lather in hard water?
A. Hard water is too clean for soap
B. The salts in hard water react with the soap to form a sticky scum ✓ Correct
C. Soap dissolves fully and disappears
D. Hard water has no minerals at all
Solution: Hard water contains calcium and magnesium salts that react with soap to form a useless white scum, leaving little soap to make lather.
Q10 — Soaps & Detergents · hard · theory
Why is a lot of detergent washed into rivers harmful?
A. It helps fish grow faster
B. The foam and chemicals pollute the water and harm fish and plants ✓ Correct
C. It makes the river water safe to drink
D. It turns the river into clean soap
Solution: Detergent foam and chemicals pollute river water and can harm the fish, plants and other living things in it.