Test: Metals In Nature

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This mock test of Test: Metals In Nature for Class 10 helps you for every Class 10 entrance exam. This contains 15 Multiple Choice Questions for Class 10 Test: Metals In Nature (mcq) to study with solutions a complete question bank. The solved questions answers in this Test: Metals In Nature quiz give you a good mix of easy questions and tough questions. Class 10 students definitely take this Test: Metals In Nature exercise for a better result in the exam. You can find other Test: Metals In Nature extra questions, long questions & short questions for Class 10 on EduRev as well by searching above.

QUESTION: 1

Which of the following alloy has copper as its constituent?

A.
Brass
B.
Alnico
C.
Steel
D.
Solder

Solution:

QUESTION: 2

Which of the following does not corrode?

A.
Silver
B.
Stainless steel
C.
Copper
D.
Iron

Solution:

QUESTION: 3

Solder is an alloy of:

A.
Lead and tin
B.
Copper and zinc
C.
Copper and tin
D.
Iron and copper

Solution:

QUESTION: 4

Ruthenium (Ru) and platinum (pt) are

A.
super insulators
B.
ideal insulators
C.
base metals
D.
noble metals

Solution: Ruthenium and paltinum are noble metals beacause they do not react with other substances and found in their pure forms.

QUESTION: 5

An alloy of iron, chromium and nickel is:

A.
Solder
B.
Brass
C.
Stainless steel
D.
Bronze

Solution:

QUESTION: 6

The purity of pure gold in carat is:

A.
24 carat
B.
22 carat
C.
23 carat
D.
21 carat

Solution:

QUESTION: 7

Alloying is not done for which of the following purpose?

A.
To degrade the properties of metals.
B.
To increase the tensile strength.
C.
To increase its hardness.
D.
To modify chemical activity.

Solution:

alloying a metal ,its properties not degrade but they show the upgrade qualities like high tensile strength,lustrous etc .New substance formed by the alloying ,like brass is the result of alloying.

QUESTION: 8

Which of the following metal is always a constituent of an amalgam?

A.
Iron
B.
Copper
C.
Mercury
D.
Zinc

Solution:

QUESTION: 9

In galvanization, iron is coated with a layer of:

A.
Zinc
B.
Steel
C.
Copper
D.
Carbon

Solution:

QUESTION: 10

Minerals from which metals are extracted are called:

A.
Allotropes
B.
Hydrocarbons
C.
Ores
D.
Alloys

Solution:

QUESTION: 11

Which of the following is not a half-metal?

A.
silicon
B.
boron
C.
arsenic
D.
chlorine

Solution:

Chlorine os the second halogen, being a non - metal in group 17 of the periodic table. It's not a half metal because it is a now metal.

QUESTION: 12

Anodising is done in case of:

A.
Aluminium
B.
Iron
C.
Sodium
D.
Copper

Solution:

Anodising is a process of forming a thick oxide layer of aluminum. This aluminium oxide coat makes it resistant to further corrosion.

QUESTION: 13

The Homogeneous mixture of two or more metals or a metal and a non-metal is called an:

A.
Alloy
B.
Mineral
C.
Ore
D.
Both alloy and ore

Solution:

An alloy is a homogenous mixture of two or more metals or non metals mixed in a molten state.

QUESTION: 14

Give the composition of brass.

A.
Cu and Fe
B.
Cu and Zn
C.
Cu and Al
D.
Fe and Zn

Solution: Obviously copper and zinc is the right one. copper percentage in the mixture of brass is 73% and and the zinc percentage in the mixture of brass is 25%.To enhance the machinability of brass, lead is often added in concentrations of around 2%.

QUESTION: 15

Silver articles become black when exposed to air due to formation of:

A.
Silver nitrate
B.
Silver sulphide
C.
Silver hydroxide
D.
Silver nitride

Solution:

The silver article becomes black after sometimes when exposed to air because silver reacts with sulphur which is present in the atmosphere and then forms silver sulphide. Thus the layer of this silver sulphide is formed on the surface of the silver article so they appear as dull or black.