Class 6 science chapter 4 question answer
Today, I am sharing class 6 science chapter 4 question answer. Sorting materials into groups. Hope it helps! For weight loss tips read: aerobic exercise at home for weight loss
Very short answer questions:
1. Name two transparent objects.
ANSWER: Clear glass, glass window
2. Name two materials which do not have lustre.
ANSWER: wood, paper
3. Name two hard and two soft objects.
ANSWER: Hard objects: chair, table; Soft objects: foam, melted wax
Short answer questions:
1. (a) What are the three physical states of materials?
ANSWER: On the basis of materials, three physical states of materials are: solid, liquid and gas.
(b) Give any two differences between these states.
ANSWER: 1. solids: (a) cannot be compressed; (b) particles are closely-packed.
liquids: (a) can be compressed to a small extent; (b) particles are less closely packed with respect to solid.
gases: (a) highly compressed; (b) particle are loosely-packed.
2. (a) What are materials?
ANSWER: A substance used to make different objects are called as materials.
(b) What are the different types of materials?
ANSWER: Materials are of two types:
- man-made materials- example plastic which are made in factories.
- natural materials- example wood which is obtained from nature.
3. Classify the following into lustrous and non-lustrous materials: gold chain, plastic bottle, cotton shirt and aluminium rod.
ANSWER: Lustrous materials have shining surface such as gold chain, aluminium rod.
Non-lustrous materials do not have shining surface such as plastic bottle, cotton shirt.
4. Classify the following into hard and soft materials: diamond, wax, brick and tomato.
ANSWER: Hard materials- diamond (hardest substance), brick
Soft materials- wax, tomato.
5. We put some sugar in a glass of water and stir. After some time, it disappears.
(a) Why did sugar disappear in water?
ANSWER: Sugar disappeared because sugar gets dissolved in water.
(b) What do we learn from this property of sugar which gets mixed in water?
ANSWER: From this property of sugar, we learnt to get mixed with people and be social.
Long answer questions:
1. What are the advantages of classification of objects?
ANSWER:- It helps in systematic study of objects.
– It helps in identifying and locating things.
2. How can you find whether a material is lustrous or non-lustrous?
ANSWER: Method- By rubbing the surface of material with sandpaper, we can find whether material is lustrous or non-lustrous.
Observation- If special kind of shine is present on material on rubbing then it will be lustrous. Example: copper, iron and aluminium. If material such as paper, wood do not have lustre then it will be non-lustrous.
3. (a) What are translucent materials? Give two examples.
ANSWER: The materials through which we can see the objects partially are called translucent materials. For example grounded glass, frosted glass, tissue paper.
(b) What is meant by opaqueness? Explain with examples.
ANSWER: The materials through which we cannot see the objects are called opaque objects and this property of materials is called as opaqueness. For example: books, wood.
4. (a) What are miscible and immiscible liquids?
ANSWER: Miscible liquids are those liquids that get completely mixed with water and forms a single layer. For example: alcohol mixed with water.
Immiscible liquids are thosed liquids that do not mix with water and form a separate layer. For example: mustard oil do not mixed with water.
(b) Is it possible to dissolve gases in water? If yes, give an example.
ANSWER: Yes, it is possible to dissolve gases in water. For example: aquatic plants and animals use oxygen dissolved in water.
HOTS (Higher order thinking skills)
1. Why are glasses of the car sometimes coloured?
ANSWER: Glasses of the car are sometimes coloured because:
– Glasses of a car are transparent through which we can see inside of the car. Coloured glasses do not allow us to see inside the car.
– Coloured glasses also prevents outside heat from entering the car.
2. Why are the handles of cooking utensils made up of hard plastic or wood?
ANSWER: The handles of cooking utensild made up of hard plastic or wood because:
(a) Plastic or wood is bad conductor of heat, thus heat from pan cannot transferred to our hand.
(b) They are hard so they cannot be compressed.
3. Why do solids, liquids and gases have different properties?
ANSWER: Solids, liquids and gases have different properties because:
(a) Solids have definite shape, liquids and gases do not have definite shape.
(b) Volume of solids and liquids are fixed but volume of gases are not fixed.
(c) Particles are closely packed in solids and less closely packed in liquids as compared to solids. In gases, particles are loosely packed.
Practical skill based question:
What will happen when you pour mustard oil and vinegar on water kept in two separate glasses? Write your obsevation.
ANSWER: When we pour mustard oil in one glass then it do not mixed with water and form a separate layer .
When we pour vinegar in water then it completely mixed with water and forms a single layer.
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