RBSE Class 6 Science Important Questions Chapter 4 Sorting Materials into Groups

Rajasthan Board  RBSE Class 6 Science Important Questions Chapter 4 Sorting Materials into Groups Important Questions and Answers.

RBSE Class 6 Science Chapter 4 Important Questions Sorting Materials into Groups

Multiple Choice Questions

Question 1. 
Select the transparent material from the following:
(a) iron 
(b) steel
(c) paper 
(d) glass
Answer:
(d) glass

 

Question 2. 
Select the opaque material from the following:
(a) glass 
(b) water
(c) lemon juice 
(d) iron 
Answer:
(d) iron 

Question 3. 
Which one of the following is soft?
(a) Sugar 
(b) Mud
(c) Gold 
(d) Sponge
Answer:
(d) Sponge

Question 4. 
Which one of the following is hard?
(a) Cotton 
(b) Sponge
(c) Iron 
(d) Dough
Answer:
(c) Iron 

Question 5. 
Which of the following materials is not lustrous?
(a) Wood 
(b) Gold .
(c) Silver 
(d) Steel
Answer: 
(a) Wood 

Fill in the Blanks

Question 1. 
Sugar and salt are ................ in water.
Answer:
soluble

Question 2. 
The object whose density is more than water will ................ in water.
Answer:
sink

Question 3. 
utter paper passes little light to pass through it so it is ................ in nature.
Answer:
translucent

Question 4. 
The leaf will ................on oil/water.
Answer:
float

Question 5. 
Diamond is ................ in nature.
Answer: 
hard.

State whether True or False

Question 1. 
Lock and glass are made up of plastics.
Answer:
False

Question 2. 
Oil is soluble in water and sugar is insoluble.
Answer:
False

Question 3. 
We can see clearly from translucent material.
Answer:
False

Question 4. 
Oil floats on water because its density is higher than water.
Answer:
False

Question 5. 
All gases are soluble in water.
Answer: 
False

Match the followings

Column I	Column II
1. Metal	(a) mixes well with water
2. Plastic	(b) copper
3. Soluble	(c) light cannot pass through it
4. Saturate	(d) sugar
5. Transparent	(e) shiny
6. Opaque	(f) bad conductor of heat
7. Translucent	(g) universal solvent
8. Lemon	(h) light can pass through it
9. Water	(i) cannot see the object clearly
10. Silver	(j) cannot dissolve more substance

Answer:

Column I	Column II
1. Metal	(d) sugar
2. Plastic	(f) bad conductor of heat
3. Soluble	(d) sugar
4. Saturate	(i) cannot see the object clearly
5. Transparent	(h) light can pass through it
6. Opaque	(c) light cannot pass through it
7. Translucent	(i) cannot see the object clearly
8. Lemon	(a) mixes well with water
9. Water	(g) universal solvent
10. Silver	(e) shiny

 

Very Short Answer Type Questions

Question 1. 
Why do we group the materials? 
Answer: 
Grouping of materials is done for our convenience to study their properties and to make the best use of them.

Question 2. 
How shine of metal can be regained?
Answer: 
We can regain the shine of the metal by rubbing it with the sandpaper or by cutting its outer surface.

Question 3. What is solvent?
Answer: 
It is a substance in which other substances are dissolved. It is large in quantity. For example, water.

Question 4. 
What is solute?
Answer: 
It is a substance which dissolves in solvent. It is generally lesser in quantity. For example, sugar, salt.

Question 5. 
What is solution?
Answer: 
It is the combination of solute and solvent. For example, Salt + Water = Solution Question 6. If we see the Sun from the glass of water, are we able to view the Sun? Answer: Yes, we are able to see the Sun from a glass of water because the water is transparent in nature. 

Question 7. 
Why wires are made of copper, silver or aluminium?
Answer: 
Wires are made of copper, silver or aluminium because metals are good conductors of electricity.

Short Answer Type Questions

Question 1. 
Can we make different objects from same materials?
Answer: 
Yes, we can make different objects from same materials. For example, with the help of plastics, we can make switches, mugs, baskets, buckets, balls, polythene, vehicle parts, etc. With wood, we can make furniture like - chairs, tables, cupboards, etc. 

Question 2. 
Why tumbler should not be made with cloth?
Answer: 
Tumblers should not be made with cloth because we use tumblers to keep liquids, a piece of cloth cannot hold the liquid, therefore, tumblers should be made of glass, mud or metal, etc. in order to hold liquids.

Question 3. 
What will happen to chalk powder or sand when we put them in water? 
Answer: 
Chalk powder and sand will not dissolve in water as they are insoluble substances. Sand will settle at the bottom and chalk powder will suspend in water.

Question 4. 
Why some objects float on liquid whereas others sink?
Answer: 
Floating and sinking depend on the weight or density of objects and liquid. If density of an object is less than liquid, it will float on water whereas if density of an object is more than liquid, it will sink. 

Question 5. 
The nature of cooking utensils and its handle are opposite to each other, comment on it.
Answer: 
Cooking materials are generally made from materials such as aluminium because it is a good conductor of heat whereas we use the handles of the utensils made of wood or plastics because they are bad conductors of heat.

Question 6. 
Among wax, oil, wood, iron, paper, vegetable ghee, thermocol and coin which will float and which will sink in water?
Answer:

Substances	Float/sink
Wax	Float
Oil	Float
Wood	Float
Iron	Sink
Paper	Float
Thermocol	Float
Vegetable g/tee	Float
Coin	Sink

Question 7. 
Write an activity to prove that our palm is translucent.
Answer: 
Take a torch and switch off the light of the room. Now, cover the glass of torch with your palm and switch on the torch. You will observe that the light passes through other side, of the palm but not clearly. This proves that our palm is translucent in nature.

Long Answer Type Questions

Question 1. 
Write the difference between hard material and soft material. 
Answer: 
Difference between Hard Material and Soft Material

Hard materials	Soft materials
The materials which cannot be pressed or scratched easily are known as hard materials.	The materials which can be pressed or scratched easily are known as soft materials.
For example, iron, steel, wood, etc.	For example, cotton, sponge, etc.

Question 2. 
Write the difference between soluble and insoluble materials. 
Answer: 
Difference between Soluble and Insoluble Materials

Soluble materials	Insoluble materials
The materials which easily dissolve in water are called soluble materials.	The materials which do not mix with water even after stirring them well are known as insoluble materials.
For example, salt, lemon, sugar, alum, etc.	For example, sand, oil, etc.