i. Opaque is a materials through which you are not able to see. True
ii. Insoluble substances mix in water. False
iii. Soft materials can be compressed or scratched. True
iv. Brick is opaque, while butter paper is translucent. True
v. Salt does not dissolve in water. False
vi. All gases are non–lustrous. True
vii. Oil mixes with water. False
viii. Stone settles down in water. True
ix. Vinegar does not mix with water. False
x. Iron is harder than sponge. True
xi. Air is transparent. True
xii. Glycerine is not soluble in water. False
xiii. Diamonds, gems and pearls are lustrous. True
xiv. Honey floats on the surface of water. False
xv. Alcohol is immiscible with water. False
xvi. Diamond is the hardest natural occurring substance. True.
i. Oxygen gas is soluble in water.
ii. Grouping things together with similar properties is called Sorting/Classification.
iii. Mercury is the metal that exists in liquid state.
iv. Potassium is a soft metal that can be cut with a knife.
v. Iodine is a non-metal that has lustre.
vi. A piece of stone is a hard material.
vii. All gases are not soluble in water.
viii. Dried leaf floats on the surface of water.
ix. Oily patch on a piece of paper is translucent.
x. Water is a transparent liquid.
xi. Materials that have lustre are usually called as metal.
xii. Materials are grouped on the basis of similarities or dissimilarities in their properties.
xiii. Based upon transparency, materials can be grouped as opaque, transparent and translucent.
xiv. A substance which is used in making different objects is called material.
Ans. Amongst the liquids, mercury is the lustrous.
Ans. Graphite and Iodine crystals
Ans. The mustard oil floats on water and forms a separate layer.
Ans. wax, plastic ball, wood, leaf, ice, thermocol, oil
Ans. stone, key, screw, iron nail, coin
Ans. Table and Chair
Ans. glass bowl and steel spoon
Ans. paper, thermocol, thin plastic sheet
Ans. Plastic or Metal
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