Materials Into Groups
Opaque is a materials through which you are
not able to see. True
Insoluble substances mix in water. False
Soft materials can be compressed or
Brick is opaque, while butter paper is
Salt does not dissolve in water. False
All gases are non–lustrous. True
Oil mixes with water. False
Stone settles down in water. True
Vinegar does not mix with water. False
Iron is harder than sponge. True
Air is transparent. True
Glycerine is not soluble in water. False
Diamonds, gems and pearls are lustrous. True
Honey floats on the surface of water. False
Alcohol is immiscible with water. False
Diamond is the hardest natural occurring
Q2. Fill in the blanks.
is soluble in water.
Grouping things together with similar
properties is called Sorting/Classification.
the metal that exists in liquid state.
a soft metal that can be cut with a knife.
Iodine is a non-metal that has lustre.
A piece of stone is a hard material.
All gases are not soluble in water.
Dried leaf floats
on the surface of water.
Oily patch on a piece of paper is translucent.
Water is a transparent
Materials that have lustre are usually
called as metal.
Materials are grouped on the basis of similarities or
dissimilarities in their
Based upon transparency, materials can be
grouped as opaque, transparent and
A substance which is used in making
different objects is called material.
Q3. Name a substance through which light can pass through
partially but one cannot see through it clearly.
Q4. Name a liquid which is lustrous.
Amongst the liquids, mercury is the lustrous.
Q5. Name two non-metals which are lustrous.
Graphite and Iodine crystals
happens when we add mustard oil to a glass full of water?
Ans. The mustard oil
floats on water and forms a separate layer.
Q7. Name some
materials that float on water.
Ans. wax, plastic ball,
wood, leaf, ice, thermocol, oil
some materials that sink in water.
Ans. stone, key, screw,
iron nail, coin
Q9. Name any
two things which can be made out of wood.
Ans. Table and Chair
the object from the following which shine: brick, earthen pitcher, glass bowl,
plastic table, steel spoon, cotton bed sheet, newspaper.
Ans. glass bowl and steel
Q11. Make a
list of items that floats on kerosene.
Ans. paper, thermocol, thin
one lustrous material.
material is generally used for making pens?
Ans. Plastic or Metal