Sorting Materials into Groups Test - 1

Explanation:

Chair, table and plough are made up of wood obtained from plants.All tree are solid in shape and wood being solid it is used to make chair, table and plough.

Explanation:

Sugar is soluble in water while mustard oil, sand and plastic is insoluble in water.A solute will dissolve in a solvent which is chemically similar to it. both water and sugar are polar solvent and solute. hence sugar dissolves in water and not other substances like oil, sand and plastic.

Explanation:

Diamond is the hardest known natural substance due to arrangement of molecule of it. Each carbon atom is covalently bonded to four other carbon atoms.A lot of energy is required to separate the atoms in diamond.

Explanation:

All metals are good conductor of heat and electricity.Metals are solids and the atoms are so tightly packed that heat transfer is more efficient.Hence all metals are good conductors of heat and electricity.

Explanation:

Those substances that have less density than water floats on water surface such as plastic ball and feather. Some other examples are Cork, butter etc.Those with higher density than water will sink in the water.

Explanation:

Those materials through which light cannot pass is called as opaque materials. Wooden door is a opaque material. Opque materials casts shadow as it blocks the light completely. Some other examples are card board box, book etc.

Explanation:

Tawa, spade and pressure cooker are made up of metals while eraser is made up of rubber. Eraser is an object used to remove the marks from the paper.It can be a pencil or a pen mark.Eraser is made up of rubber which may be natural or synthetic.

Explanation:

Those substances that have shining surface are called as lustrous substance. Diamond, gold and silver are lustrous while wood is not lustrous. Metals are lustrous as they have smooth surface and reflect light while a non metal like wood have rough surface and cannot reflect light hence they are not lustrous.

Explanation:

Transparent material is used to make wind screen of a car as it is must to see through them. Wind screen is the glass window in front of the car where drivers looks into and drive. So to see the vehicles in front of the car, the windscreen is usually made from transparent objects like glass.

Explanation:

Safety pins is made up of  either plastic or steel.The body and the sharp tip is made up of steel and the large head is often made of plastic.