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Test: Physical Properties of Metals - UPSC MCQ


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15 Questions MCQ Test Science & Technology for UPSC CSE - Test: Physical Properties of Metals

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Test: Physical Properties of Metals - Question 1

Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?

(i) Good thermal conductivity

(ii) Good electrical conductivity

(iii) Ductility

(iv) High melting point

Detailed Solution for Test: Physical Properties of Metals - Question 1

 The correct answer is  (i) and (iv)

Explanation: Aluminum is ductile and has a high electrical conductivity, which makes it unsuitable for utensil production. Aluminium has a high melting point and good heat conductivity. Copper, steel (an alloy of iron), and aluminium are the most popular metals used to make utensils. Due to their ability to conduct heat, copper and aluminium are the most used materials.

Test: Physical Properties of Metals - Question 2

The best conductor of electricity among the following is:

Detailed Solution for Test: Physical Properties of Metals - Question 2

Silver is the best conductor of electricity among the given options because it has a relatively low electrical resistivity. The electrons in silver are able to move more freely than those of the other elements, allowing electricity to flow more easily. This is due to the structure of the silver atom, which allows for more free electrons on the outer shell. Additionally, silver has a high thermal conductivity, meaning it is able to transfer heat quickly and efficiently.

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Test: Physical Properties of Metals - Question 3

Identify the amphoteric oxide from the following:​

Detailed Solution for Test: Physical Properties of Metals - Question 3

Amphoteric metal oxides react with both acids as well as bases to produce salt and water.

Aluminium oxide is an amphoteric oxide because it reacts with acids as well as bases and form salts and water.

Al2O3     +     6HCl     →     2AlCl3    +    3H2O                      (Basic nature)

Aluminium   Hydrochloric   Aluminium      Water

   oxide            acid          chloride

 

Al2O3        +       2NaOH    →      2NaAlO2     +     H2O           (Acidic nature)

Aluminium           Sodium              Sodium          Water

   oxide             Hydroxide          aluminate        

Test: Physical Properties of Metals - Question 4

Which one of the following is a poor conductor of heat?

Detailed Solution for Test: Physical Properties of Metals - Question 4

Heat energy is conducted by transferring energy of atoms vibrating at high level. This energy is transferred by vibrating neighboring atom. Since high density of mercury, there is no enough room for vibrating mercury atoms. So it can’t be heated easily.

Test: Physical Properties of Metals - Question 5

All metals exist as solid at room temperature except the metal ‘X’. Name the metal “X’.

Detailed Solution for Test: Physical Properties of Metals - Question 5

It is the only metal that is liquid at room temperature. It has the lowest melting point and boiling point of any other metal. It has low thermal conductivity, and a quite low electrical conductivity. It is the only metal that doesn’t form diatomic molecules in the gaseous phase.

Test: Physical Properties of Metals - Question 6

The metal that can be easily cut by knife is:

Detailed Solution for Test: Physical Properties of Metals - Question 6

Sodium is an alkali metal and is so soft that it can be easily cut by knife.

Test: Physical Properties of Metals - Question 7

Which allotrope of carbon conducts electricity?

Detailed Solution for Test: Physical Properties of Metals - Question 7

Graphite is an interesting material, an allotrope of carbon (as is diamond). It displays properties of both metals, and nonmetals. However, like a metal, graphite is a very good conductor of electricity due to the mobility of the electrons in its outer valence shells.

Test: Physical Properties of Metals - Question 8

Metal which is a poor conductor of heat is:

Detailed Solution for Test: Physical Properties of Metals - Question 8

Lead is a metal but it is a poor conductor of heat because it contain some particles which does not allows heat to pass through it .

Test: Physical Properties of Metals - Question 9

Which of the following property is generally NOT shown by metals?

Detailed Solution for Test: Physical Properties of Metals - Question 9

The properties that should have for a metal are sonority, lustrous, malleability ductility, heat and electrical conductivity as dullness is not one of them it is the correct option

 

Test: Physical Properties of Metals - Question 10

A lustrous non-metal is:

Detailed Solution for Test: Physical Properties of Metals - Question 10

Non - metals do not have luster. They do not reflect light from their surface ( except iodine and diamond) . So, here a lustrous now Metal is iodine.

Test: Physical Properties of Metals - Question 11

Which is the most abundant non-metal on the earth?

Detailed Solution for Test: Physical Properties of Metals - Question 11

In our atmosphere , presence of 78 % nitrogen after then presence of oxygen 21 % others 1 %. so the abundant non metal is oxygen

Test: Physical Properties of Metals - Question 12

What happens when non-metals react with water? 

Detailed Solution for Test: Physical Properties of Metals - Question 12

Non - metals do not react with water to evolve hydrogen gas. ( no reaction)

Test: Physical Properties of Metals - Question 13

The non-metal that is liquid at room temperature is:

Detailed Solution for Test: Physical Properties of Metals - Question 13

Metals that are liquids at room temperature are mercury (Hg) and gallium (Ga). Non-metals liquid at room temperature - bromine (Br). However, other elements such as caesium (Cs), rubidium (Rb) and francium (Fr) also become liquids at a few degrees above room temperature.

Test: Physical Properties of Metals - Question 14

The lustre of a metal is due to:

Detailed Solution for Test: Physical Properties of Metals - Question 14

The lustre of a metal is due to presence of free electrons.

It has to do with the way light and electrons on the surface of metals interact. The outer electrons in a metal are almost not bound to any individual atom, thus are relatively free, and are concentrated on the surface. These electrons (electron density) tend to oscillate at a collective frequency. 

Test: Physical Properties of Metals - Question 15

The most ductile metal among given options is:

Detailed Solution for Test: Physical Properties of Metals - Question 15

Gold is the most ductile metal. A wire of about 2 km length can be drawn from one gram of gold.

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