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Class 6 Sorting Materials Into Groups MCQs
1. Which of the following materials is transparent?
a.) Stainless steel plate
b.) Glass tumbler
c.) Mirror
d.) Plastic bottle
Answer – (b.) Glass tumbler
Explanation – Almost all the light that strikes transparent materials passes directly through them. In stainless steel, mirror and plastic bottles, light cannot pass through them, and they are therefore not considered transparent.
2. From the given options, choose the one that does not belong to the group.
a.) Milk
b.) Honey
c.) Oil
d.) Ink
Answer – (c.) Oil
Explanation – Milk, honey and ink can dissolve in water, but oil cannot. Hence, oil does not belong to the group.
3. The liquids that dissolve in one another are called ____.
a.) Immiscible
b.) Miscible
c.) Insoluble
d.) None of the above
Answer – (b.) Miscible
Explanation – When two liquids mix completely, and there is no distinguishable layer between them in the solution, they are said to be miscible.
4. Which of the following is completely soluble in water?
a.) Chalk powder
b.) Tea leaves
c.) Sawdust
d.) Sugar
Answer – (d.) Sugar
Explanation – Chalk powder, tea leaves and sawdust are insoluble in water and settle at the bottom of the container. In contrast, sugar completely dissolves in water, leaving no traces of it.
5. Which of the following statements is incorrect?
a.) Some materials appear shiny, while others appear dull.
b.) Some materials are rough, while others are smooth.
c.) Certain materials are hard, while others are soft.
d.) Some stones are transparent, while some glasses are opaque.
Answer – (d.) Some stones are transparent, while some glasses are opaque.
Explanation – In general, stones are opaque, whereas glasses are transparent.
6. Which of the following materials do not have lustre?
a.) Iron
b.) Gold
c.) Plastic
d.) Clothes
Answer – (c.) Plastic and (d.) Clothes
Explanation – Lustre refers to the appearance of shiny materials. Metals are among the materials with this property.
7. The property of materials to be compressed easily is ____.
a.) Softness
b.) Hardness
c.) Lustre
d.) All of the above
Answer – (a.) Softness
Explanation – Soft materials are those that can be easily compressed or scratched, whereas hard materials are those that are difficult to compress. Cotton, for example, is soft, whereas iron is hard.
Lustre is the ability of materials to have a shiny appearance.
8. Which of the following materials is translucent?
a.) Stained glass
b.) Mirror
c.) Wall
d.) Cloth
Answer – (a.) Stained glass
Explanation – The materials through which objects can be seen but not clearly are translucent.
Mirror, wall and a piece of cloth does not allow any light to pass through them, and hence, they are opaque.
9. Choose the odd one out of the given options below.
a.) Gold
b.) Silver
c.) Diamond
d.) Plastic
Answer – (d.) Plastic
Explanation – Gold, silver and diamond are lustrous materials, whereas plastics are dull materials.
10. The materials which allow light to pass through them completely are called —.
a.) Transparent
b.) Translucent
c.) Opaque
d.) Lustrous
Answer – (a.) Transparent
Explanation – We can see clearly through transparent materials.
11. Which of the following will get reddish-brown in colour on exposure to air or moisture?
a.) Gold
b.) Silver
c.) Aluminium
d.) Iron
Answer – (d.) Iron
Explanation – Iron, on exposure to air or moisture, loses its lustre and becomes dull.
12. Mustard oil and kerosene are ____ liquids.
a.) Miscible
b.) Immiscible
c.) Soluble
d.) Insoluble
Answer – (b.) Immiscible
Explanation – Mustard oil and kerosene do not dissolve in water. They separate after a while, forming different layers.
13. Which of the following materials is hard?
a.) Cotton
b.) Paper
c.) Sponge
d.) Table
Answer – (d.) Table
Explanation – Table cannot be compressed, whereas cotton, paper and sponge can be compressed and scratched easily.
14. Which of the following will float on water?
a.) Iron
b.) Ice
c.) Stone
d.) Book
Answer – (b.) Ice
Explanation – Ice is lighter than water and thus will float on water.
15. An object can be made of different ____.
a.) Materials
b.) Shape
c.) Size
d.) All of the above
Answer – (d.) All of the above
Explanation – Different objects are made according to different requirements.
16. Which of the following is a miscible liquid?
a.) Ink
b.) Petrol
c.) Oil
d.) Milk
Answer – (a.) Ink and (d.) Milk
Explanation – Ink and milk can completely dissolve in water, whereas oil and petrol form separate layers on mixing with water.
17. The substances that allow light to pass through them partially are called ___.
a.) Transparent
b.) Translucent
c.) Opaque
d.) Lustrous
Answer – (b.) Translucent
Explanation – We can see through translucent objects but not clearly.
18. All gases in the air are ____ conductors of heat.
a.) Good
b.) Bad
c.) Both (a) and (b)
d.) Sometimes good, sometimes bad
Answer – (b.) Bad
Explanation – Air is a poor conductor because its molecules are not in constant contact with one another.
19. Heavy substances ____ in water.
a.) Sink
b.) Float
c.) Sometimes sink and sometimes float
d.) First float, then sink
Answer – (a.) Sink
Explanation – Heavier objects have a density greater than water.
20. The materials that do not allow light to pass through them are called ____.
a.) Transparent
b.) Translucent
c.) Opaque
d.) Lustrous
Answer – (c.) Opaque
Explanation – We cannot see through an opaque material. For example, walls and wood are opaque materials.
