Solid floats just below the surface of water and it neither sinks nor floats on water due to almost same density of the solid and water.

It is easier to hold a steel tumbler with cold milk than the one with hot milk because steel is a good conductor of heat and steel tumbler becomes hot due to hot milk and it can burn our hands

Substances which are soluble in the other substance are :
(a) Honey in water
(b) Glucose in water
(c) Groundnut oil in mustard oil
Substances which are insoluble in the other substance are:
(a) Turmeric in water
(b) Rice flour in water
(c) Mustard oil in water

Materials can be classified into three groups on the basis of physical state:
Solids: They have definite shape and volume, e.g., iron, ice, etc.
Liquids : They have definite volume but do not have definite shape, e.g., water.
Gases : They do not have definite shape and volume, e.g., air

(1) It helps in gaining systematic knowledge of things.
(2) It gives a general idea about all the members of a group and the differences between the members of different groups.
(3) It is convenient to work with all members of a group after knowing their properties

Cover the glass of a torch with your palm at a dark area. Switch on the torch and observe from the other side of palm. We see that the light of torch passes through the palm but not clearly. This demonstration shows that our palm shows the property of translucent when a strong beam of light passes through it.

The silver spoon on long exposure to moist air has lost its shine and appears dull whereas gold does not tarnish.

List of some materials that are used for making more than one type of an object as follows:
Wood Chair, table, plough, bullock cart and its wheels.
Paper books, notebooks, newspaper, toys, calendars.
Leather Shoes, belts, wallets, bags and photo albums.
Plastic Buckets, lunch boxes, toys and pipes.

Objects that float in water are plastic, sawdust, dry leaves, ice, kerosene objects the objects that sink in water are copper, silver, gold, stone, chalk.

The three common characteristics of materials are.
(i) All materials occupy space.
(ii) All materials possess mass.
(iii) All materials can be felt by one or more of our sense organs.

List of some items that float on water are
(i) Wood
(ii) Wax
(iii) Thermocol
(iv) Oil
(v) Ice
(vi) Plastic
(b) List of items that float on oil or kerosene are
(i) Wood
(ii) Paper
(iii) Wax
(iv) Plastic
(v) Thermocol

From the given Objects, glass bowl and steel spoon are shiny objects which also called lustrous materials.

Five objects which can be made from wood are
(i) Door
(ii) Window
(iii) Table
(iv) Chair 
(v) Boat