Separation of Substances – CBSE Class 6 Science MCQs
Separation of Substances – CBSE Class 6 Science MCQs
Class: 6
Subject: Science
Section: Materials Around Us
Topic: Separation of Substances
Board: CBSE (Based on NCERT Syllabus)
Subject: Science
Section: Materials Around Us
Topic: Separation of Substances
Board: CBSE (Based on NCERT Syllabus)
These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 6 Science examination preparation. Each question includes a detailed explanation for concept clarity.
1. Why do we need to separate substances?
Answer: D. All of the above
Separation helps remove unwanted materials, obtain useful substances, and make materials suitable for use. For example, separating stones from rice ensures purity and safety.
Separation helps remove unwanted materials, obtain useful substances, and make materials suitable for use. For example, separating stones from rice ensures purity and safety.
2. Handpicking is used when impurities are:
Answer: B. Large and visible
Handpicking is suitable when impurities like stones or husk are large enough to be picked by hand from grains.
Handpicking is suitable when impurities like stones or husk are large enough to be picked by hand from grains.
3. Which method is used to separate husk from grain?
Answer: B. Winnowing
Winnowing uses wind to blow away lighter husk particles while heavier grains fall down.
Winnowing uses wind to blow away lighter husk particles while heavier grains fall down.
4. Sieving is useful when components differ in:
Answer: B. Size
Sieving separates particles based on size differences, such as separating flour from bran.
Sieving separates particles based on size differences, such as separating flour from bran.
5. Sedimentation occurs when:
Answer: B. Insoluble heavy particles settle
During sedimentation, heavier insoluble particles settle at the bottom when water is left undisturbed.
During sedimentation, heavier insoluble particles settle at the bottom when water is left undisturbed.
6. The clear liquid above sediment is called:
Answer: C. Supernatant
After sedimentation, the clear liquid that remains on top is called the supernatant.
After sedimentation, the clear liquid that remains on top is called the supernatant.
7. Decantation means:
Answer: B. Pouring clear liquid gently
Decantation involves carefully pouring the supernatant without disturbing the sediment.
Decantation involves carefully pouring the supernatant without disturbing the sediment.
8. Filtration separates:
Answer: B. Insoluble solid from liquid
Filtration uses filter paper or cloth to trap insoluble particles while liquid passes through.
Filtration uses filter paper or cloth to trap insoluble particles while liquid passes through.
9. Evaporation is used to obtain:
Answer: B. Dissolved solids
When water evaporates, dissolved substances like salt remain behind.
When water evaporates, dissolved substances like salt remain behind.
10. Which process forms clouds?
Answer: B. Condensation
Water vapor cools and condenses into tiny droplets forming clouds.
Water vapor cools and condenses into tiny droplets forming clouds.
11. Loading helps in:
Answer: A. Faster sedimentation
Chemicals like alum make fine particles heavier so they settle faster.
Chemicals like alum make fine particles heavier so they settle faster.
12. Churning is used to separate:
Answer: A. Cream from milk
Churning separates lighter fat particles (butter/cream) from liquid.
Churning separates lighter fat particles (butter/cream) from liquid.
13. Mixtures can be separated because components have:
Answer: B. Different properties
Differences in size, weight, solubility, and density allow separation.
Differences in size, weight, solubility, and density allow separation.
14. Salt from seawater is obtained by:
Answer: B. Evaporation
Water evaporates under sunlight leaving salt behind.
Water evaporates under sunlight leaving salt behind.
15. Which is NOT a separation method?
Answer: C. Grinding
Grinding changes size but does not separate components.
Grinding changes size but does not separate components.
16. The process of converting vapor to liquid is:
Answer: B. Condensation
Cooling water vapor changes it back into liquid.
Cooling water vapor changes it back into liquid.
17. Which method uses a sieve?
Answer: A. Sieving
A sieve allows smaller particles to pass through while retaining larger ones.
A sieve allows smaller particles to pass through while retaining larger ones.
18. Water cycle involves evaporation and:
Answer: B. Condensation
Both processes are essential for cloud formation and rainfall.
Both processes are essential for cloud formation and rainfall.
19. Residue is:
Answer: B. Solid left on filter
Residue is the insoluble solid remaining on filter paper.
Residue is the insoluble solid remaining on filter paper.
20. Which separation method uses wind?
Answer: C. Winnowing
Wind carries away lighter particles like husk, leaving heavier grains behind.
Wind carries away lighter particles like husk, leaving heavier grains behind.