Classification Based on Appearance

Q.

What is luster? Give an example

Q.

Question 08

Which of the following material is not lustrous?
(a) Gold
(b) Silver
(c) Wood
(d) Diamond

Q. All metals are lustrous in nature.

1. True
2. False

Q.

What are diathermanous substances? Give two examples.

Q. Which among the following materials: has lustre, is hard and opaque?

1. Wood
2. Tin
3. Plastic
4. Rubber

Q. Metals are usually in appearance.

1. lustrous
2. non-lustrous
3. dull

Q.

Find the odd one out from the following.

1. Tawa

2. Spade

3. Pressure Cooker

4. Eraser

Q. How do we classify materials based on the amount of light they allow to pass through them?

Q.

Question 1

An iron nail is kept in each of the following liquids. In which case would it lose its shine and appear dull ?

(a) Mustard oil

(b) Soft drink

(c) Coconut oil

(d) Kerosene

Q.

Question 4 (ii)

State whether the statement given below is True or False.

A notebook has lustre while eraser does not.

Q. Hardness, texture and lustre fall under the category of ____________.

1. solubility
2. transparency
3. visibility
4. appearance

Q. Select the material which is lustrous and opaque.

Q. Hardness, texture and lustre fall under the category of ____________.

1. solubility
2. transparency
3. visibility
4. appearance

Q.

Which of the following has dull appearance?

1. Gold foil
2. Aluminium foil
3. Bricks
4. Steel rod

Q.

Question 5 (a)

Given below are the names of some objects and materials:
Water, basket ball, orange, sugar, globe, apple and earthen pitcher
Group them as:
Round shaped and other shapes

Q. Which among the following should be used in windows for the room that needs sunlight throughout the day?

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

Q.

Question 2

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

Q. From the given options choose the criteria for sorting substances based on appearance.

1. The object is soluble in water or not.
2. The object can be compressed or not.
3. The object looks good or not.
4. The object shines or not.

Q. Hardness, texture and lustre fall under the category of ____________.

1. solubility
2. transparency
3. visibility
4. appearance

Q. Hydrogen gas reacts with chlorine gas when sunlight falls on them partially. Which of the following materials can be used for sunlight to partially pass through?

1. Tinted glass
2. Aluminium sheet
3. Perforated cardboard
4. Cling wrap

Q. Arrange the following substances in the increasing order of hardness.
Sponge, brick, iron rod, diamond [1 mark]

Q. Which among the following is not a common method to bring the shine back in our everyday objects?

1. Greasing
2. Washing
3. Polishing
4. Scraping with a sandpaper

Q. Hardness, texture and lustre fall under the category of ____________.

1. solubility
2. transparency
3. detection
4. appearance

Q. Metals are usually in appearance.

1. lustrous
2. non-lustrous
3. dull

Q. Choose the correct pairs of object which have the same hardness.

1. 
2. 
3. 
4. 
5. 
6. 

Q. Sandpaper is used to bring back shine of metal objects.

1. False
2. True

Q.

Which of the following is translucent?

1. Copper
2. Glass
3. Butter paper
4. Wood

Q. that compose objects differ from each other hence characteristics are also different.

1. Mass
2. Volume
3. Space
4. Atoms

Q. On a bright sunny day, Shikha was playing hide and seek with her brother. She hid herself behind a glass door. Do you think her brother will be able to locate her? If yes, why? If no, why not? [2 marks]

Q.

Which property of metals allows their usage as ornaments? [1 MARK]