Toughness

Q.

10. What is the difference between soft and hard materials?

Q.

Stone is transparent, while glass is opaque.

1. True
2. False

Q.

The property of the material which allows light to pass through them is called __.

1. Translucency

2. Opacity

3. Dispersion

4. Transparency

Q.

How do we classify materials based on the amount of light they let through them? [3 MARKS]

Q.

13. Write two objects through which things can be seen clearly.

Q. Chalk, iron nail, wood, aluminium, candle, cotton usually look different from each other. Give some properties by which we can prove that these materials are different.​

Q. Match the following objects with the materials they are made up of.

$\begin{array}{cc}\text{Objects}& \text{Materials}\\ \text{1. Cups}& \text{a) Wood}\\ \text{2. Chair}& \text{b) Glass}\\ \text{3. Book}& \text{c) Leather}\\ \text{4. Shoes}& \text{d) Paper}\end{array}$

1. 1-c, 2-d, 3-a, 4-b
2. 1-b, 2-a, 3-d, 4-c
3. 1-a, 2-c, 3-b, 4-d
4. 1-b, 2-a, 3-c, 4-d

Q.

Identify the substance that is used to cut glass.

1. Fullerene

2. Diamond

3. Gas carbon

4. Bone charcoal

Q. Suresh put the same things in two different bags X and Y. However, bag Y couldn't hold all the items and got torn. What did Suresh conclude?

1. Bag X is more flexible than bag Y.
2. Bag Y is lighter than bag X.
3. Bag Y is softer than bag X.
4. Bag X is stronger than bag Y.

Q. Abhi bought an object which is made up of a hard material which allows light to pass through it. Which material mentioned below matches the given description?

1. Rubber
2. Iron
3. Wood
4. Glass

Q. Pair the materials with the objects that are made from them.

1. 
2. Plastic
3. 
4. Gold
5. 
6. Wood
7. 
8. Iron

Q.

Question 2

The ability of an object to resist any deformation or the ability to undergo damage when pressure is applied is defined as the hardness or softness of that object.

(a) An object which is very hard is used in jewellery. Identify the object.

(b) Which object is harder: steel pipe or wooden piece?

Q.

Question 2

The ability of an object to resist any deformation or the ability to undergo damage when pressure is applied is defined as the hardness or softness of that object.

(a) An object which is very hard is used in jewellery. Identify the object.

(b) Which object is harder: steel pipe or wooden piece?

Q. X-Ray can pass through our bodies but not through our bones.

1. True
2. False

Q. Which of the following substances can be classified as hard, strong, and unbreakable?

1. Earthen pot
2. Glass table
3. Paper bag
4. Iron rod

Q. X-Ray can pass through our bodies but not through our bones.

1. True
2. False

Q. Which of the given objects is hard, strong and unbreakable?

1. Earthern pot
2. Paper bag
3. Iron nail
4. Glass table

Q. Which of the given objects is hard, strong and unbreakable?

1. Earthern pot
2. Paper bag
3. Iron nail
4. Glass table

Q. Suresh put the same things in two different bags X and Y. However, bag Y couldn't hold all the items and got torn. What did Suresh conclude?

1. Bag X is more flexible than bag Y.
2. Bag Y is lighter than bag X.
3. Bag Y is softer than bag X.
4. Bag X is stronger than bag Y.

Q. X-Ray can pass through our bodies but not through our bones.

1. True
2. False

Q. Pick out the substance which cannot be sqeezed.

1. Glass jar
2. Pillow
3. Sponge
4. Tooth paste

Q.

By giving at least four examples, define the following terms :

Opaque bodies

Q.

Question 2

The ability of an substance to resist any deformation or the ability to undergo damage when pressure is applied is defined as the hardness or softness of that substance.

(a) A substance which is very hard is used in jewellery. Identify substance.

(b) Which substance is harder: steel pipe or wooden piece?

Q. Abhi bought an object which is made up of a hard material which allows light to pass through it. Which material mentioned below matches the given description?

1. Iron
2. Wood
3. Rubber
4. Glass

Q. Match the objects with their raw materials.

1. 
2. Wood
3. 
4. Plastic
5. 
6. Steel

Q.

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

(a) Stone is transparent while glass is opaque

1. True
2. False

Q. Which of the given objects is hard, strong and unbreakable?

Q. Plants in the kitchen room need sufficient sunlight. What type of material should be used to make window for the kitchen room?

1. Non-brittle material
2. Opaque material
3. Transparent material
4. Translucent material

Q.

Question 2

The ability of an substance to resist any deformation or the ability to undergo damage when pressure is applied is defined as the hardness or softness of that substance.

(a) A substance which is very hard is used in jewellery. Identify substance.

(b) Which substance is harder: steel pipe or wooden piece?

Q. Which of the given objects is hard, strong and unbreakable?

1. Earthern pot
2. Paper bag
3. Iron nail
4. Glass table