Junior Science Topic - Sorting Materials Into Groups. Chapter notes, video lectures, power point presentation and NCERT exercise solution. (Class VI, CBSE syllabus, chapter 04)

1. Hard And Soft -

ü Substances which are rigid, difficult to deform (change shape) are called as hard.

ü Substances which are not rigid, which can be easily deformed or blend are called soft.

ü Rubber and jelly are soft while metal and wood are hard.

2. Soluble And Insoluble -

ü The substances which mix completely (dissolve) in water are called as soluble.

ü The substances which do not mix with water are called as insoluble.

ü Sugar and salt are water soluble. They mix completely with water and form a clear (transparent) solution.

ü Fat and oil are insoluble in water. They do not mix with water. Oil usually float on water (suspension).

3. Transparent, Translucent And Opaque -

ü The substances through which we can see clearly are called as transparent. Example window glass of a car.

ü The substances through which we can not see clearly are called translucent. Example rough glass of washroom window.

ü The substances through which we can not see through at all are called as opaque. Example a brick wall.

4. Floating And Sinking Substances -

ü The substances which remain on the water surface are called as floating. Example a boat float on water.

ü The substances which go deep into bottom of water are called as sinking.

ü Heavy substances usually sink while lite substances float.

5. Lustrous -

ü The substances which shine are called as lustrous. Metals are good examples.

NCERT PRACTICE QUESTIONS 

1. Name five objects which can be made from wood.

Ans- a) Table b) Chair c) Doors d) Desk e) Box

2. Select those objects from the following which shine: Glass bowl, plastic toy, steel spoon, cotton shirt 

Ans - Glass bowl, steel spoon

3. Match the objects given below with the materials from which they could be made. Remember, an object could be made from more than one material and a given material could be used for making many objects.

Ans. - 

4. State whether the statements given below are True or False.

(i) Stone is transparent, while glass is opaque. (False)

(ii) A notebook has luster while eraser does not. (False)

(iii) Chalk dissolves in water. (False)

(iv) A piece of wood floats on water. (True)

(v) Sugar does not dissolve in water. (False)

(vi) Oil mixes with water. (False)

(vii) Sand settles down in water. (True)

(viii) Vinegar dissolves in water. (True)

5. Given below are the names of some objects and materials -

Water, basket ball, orange, sugar, globe, apple and earthen pitcher. Group them as - (a) Round shaped and other shapes (b) Eatables and non eatables

Ans - a)Round shaped- basket ball, orange, globe, apple, Other shapes- earthen pitcher

b) Eatables- Orange, Sugar, apple. Non eatables- basket ball, earthen pitcher, globe, water

6. List all items known to you that float on water. Check and see if they will float on an oil or kerosene.

Ans - a) Wood b) Plastic ball c) feather d) Thermocol e) Match stick f) hair 

They all float on oil and kerosene.

7. Find the odd one out from the following:

a) Chair, Bed, Table, Baby, Cupboard

b) Rose, Jasmine, Boat, Marigold, Lotus

c) Aluminum, Iron, Copper, Silver, Sand

d) Sugar, Salt, Sand, Copper sulphate

Ans - a) Baby b) Boat c) Sand d) Sand

 Junior Science Topic - Sorting Materials Into Groups. Chapter notes, video lectures, power point presentation and NCERT exercise solution. (Class VI, CBSE syllabus, chapter 04)

By - EduPorm India - The Educational Platform