Kerala SCERT Class 8 Science Chapter 7 Metals Question Answer Solution Here. Kerala Board Class 8 Students can find Here 7th Chapter Metals Notes provide by our Teacher. Important Question Answer from Chapter 7 Metals.
- Board- Kerala Board.
- Class – 8.
- Subject – Science Part 1
- Chapter – 7.
- Chapter Name – Metals.
- Topic – Question Answer Solution.
Question: (1) metals can be beaten into thin sheets by hammering this property is known as _________?
(a) Malleability
(b) Ductility
(c) Sonority
Ans: – Malleability.
Question: (2) metal can be drawn into thin wires this property is known as _________?
(a) Malleability
(b) Ductility
(c) Sonority
Ans: – Ductility.
Question: (3) the filaments of electric bulb are made of fine wire of ________?
(a) Tungsten
(b) Copper
(c) Gold
(d) Platinum
Ans:-Tungsten.
Question: (4) _______ is the most ductile metal?
(a) Platinum
(b) Gold
(c) Copper
Ans: – Platinum
Question: (5) ___________ is thermal conductors?
(a) Metals
(b) Semiconductors
(c) Non metals
(d) Insulators
Ans: – Metals.
Question: (6) the ability to conduct heat s an important property of metals is known as ___________ conductivity?
(a) Thermal
(b) Electrical
Ans: – Thermal.
Question: (7) the ability of a substance to let electricity pass through it is known as__________?
(a) Electrical conductivity
(b) Thermal conductivity
Ans: – Electrical conductivity
Question: (8) the ability of metals to produce sound when tapped with a hard material is known as _________?
(a) Sonority
(b) Ductility
(c) Malleability
Ans: – Sonority
Question: (9) the surface shining appearance this property is known as ________?
(a) Metallic lustre
(b) Malleability
(c) Ductility
(d) Sonority
Ans: – Metallic lustre.
Question: (10) gold, silver, and platinum are usually used for making__________?
Ans: – Ornaments.
Question: (11) alloy is solid solution which is homogenous mixture of two or more ___________?
(a) Metals
(b) Non- metals
(c) Stainless steel
Ans: – Metals.
Question: (12) ___________ is small amount of non-metals like carbon , silicon, etc are also added to certain alloy?
Ans: – Stainless steel.
Question: (13) _______ is essential growth of teeth and bones?
(a) Calcium
(b) Phosphors
(c) Iron
(d) Zinc
Ans: – Calcium.
SHORT QUESTION:
Question: (1) what is corrosion of metals?
Ans: – Iron and a number of other react with different components of air and form new products . this process is known as corrosion of metals.
Question: (2) what is meant by malleability?
Ans: – Metal can be beaten into thin sheets by hammering this property is known as malleability.
Question: (3) what is ductility?
Ans: – Metal can be drawn into thin fine wire this property is known as ductility.
Question: (4) what is metallic lustre?
Ans: – The surface newly formed when metal are cut, has a shining appearance this property is called as metallic lustre.
Question: (5) what is sonority?
Ans: – The ability of metal to produced sound when tapped with a hard material is known as sonority.
Question: (6) what is meant by alloy?
Ans: – An alloy is solution which is a homogeneous mixture of two or more metals.
Question: (7) method to prevent the corrosion of iron?
Ans: – (i) Paint, (ii) plastic coating
Question: (8) how stainless steel is formed?
Ans: – Small amount of non-metal like carbon, silicon etc are also added to certain alloys.