Class 8 Science Chapter 4 MCQ

Class 8 Science Chapter 4 MCQ (Multiple Choice Questions) of Materials: Metals and Non-Metals. Practice here the complete NCERT Textbook Chapter 4 of class 8 Science in the form of MCQs with answers and explanation for academic session 2020-2021.

Give more and more test to be confident in topic of metals and non-metals. Every time you will get a set of new five questions extracted from 8th science chapter 4.




Class 8 Science Chapter 4 MCQ for 2020-21

Class: 8Science
Contents:Multiple Choice Questions – MCQ Tests

Class 8 Science Chapter 4 MCQ for Exams

Class 8 Science Chapter 4 MCQ tests are given below. Tests are divided in sets of 5 questions. After selecting the option you may see the correct answer and its explanation also. All the questions are confined to grade 8 science chapter 4 NCERT textbook only. To attend a new test, a Start a New Test, button is given at the end.

Q1

Paheli is writing some statements. She wants to know in which of the following statements is or are incorrect?

[A]. Can iron will displace copper from copper sulphate solution.
[B]. Can copper will displace iron from iron sulphate solution.
[C]. Can zinc will displace copper from copper sulphate solution.
[D]. Can zinc will displace iron from iron sulphate solution.
Q2

Paheli is writing some statement which is given by her teacher. Would you help him to choose the incorrect statements?

[A]. The mixture of “Copper Hydroxide” and “Copper Carbonate” which forms the green coating on copper.
[B]. Copper carbonate is basic in nature.
[C]. The formation of green coating of copper carbonate is also called “Corrosion of copper”.
[D]. Oxide of iron rust is not corrosion, it is a “Chemical reaction”.




Q3

Paheli appeared in class test where she wrote some statements but she confused to know the incorrect statement. Would you help her to know that?

[A]. The basic metal oxides turn red litmus to blue.
[B]. Metals react with oxygen to form metals oxides.
[C]. Metals oxides are basic in nature.
[D]. Ash of magnesium which forms an acidic oxide on burning in air.
Q4

Consider the following statements and choose the correct one:

[A]. Metals have high tensile strength.
[B]. Sodium and potassium are those non-metals which have low tensile strength.
[C]. Sodium and Sulphur (non-metal) are so soft that is can be cut with a knife.
[D]. All the above.




Q5

Boojho appeared in class test where he wrote some statements but he confused to know the incorrect statement. Would you help him to know that?

[A]. Non-metals have low density which means they are light-weight.
[B]. Non-metals are not sonorous.
[C]. Non-metals, mercury can be found liquid in room temperature.
[D]. Non-metals can be solid liquid or gaseous at room temperature.
Q6

Boojho is writing some statements, choose the correct statement and help him:

[A]. If an element forms a basic oxide (which turns red litmus blue), then the element will be metal.
[B]. If an element forms an acidic oxide (which turns blue litmus red), then the element will be non-metal.
[C]. Carbon dioxide is acidic in nature.
[D]. All the above




Q7

Mohan is writing some statements, choose the incorrect statements and help him:

[A]. Metals have high melting points and low boiling points.
[B]. Metals have high density which means they are heavy.
[C]. Metals are sonorous.
[D]. Sodium and potassium are examples of metals.
Q8

Consider the following statements and choose the incorrect one:

[A]. Malleable means which can be beaten (may be broken down) by a hammer to form thin sheets.
[B]. Ductile means which can be stretched or drawn to form thin wires.
[C]. Brittle means which breaks into pieces on hammering or stretching.
[D]. Lustrous means shiny.



Q9

Boojho appeared in class test where he wrote some statements but he confused to know the correct statement. Would you help him to know that?

[A]. Metals are good conductors of electricity but poor conductors of heat.
[B]. Some metals react with sodium hydroxide to produce hydrogen gas.
[C]. When metals react with acid, they form oxygen gas.
[D]. The non-metallic oxides turn red litmus into blue.
Q10

Which of the following is not a metal?

[A]. Copper
[B]. Sulphur
[C]. Aluminum
[D]. Iron



What is meant by lustre?

Metals generally shine brilliantly and can be highly polished. The electronic structure of metals is such that the metals are able to reflect incident light. This characteristic metallic feature is called lustre.

Why metals are called ductile?

Ability of the metals to be melted and drawn into thin wires is called ductility. Because of this property, metals are known as ductile.

What happened when metal react with dilute acids?

Most metals react with dilute acids (Sulphuric and hydrochloric acids) by replacing hydrogen and forming a salt. Hydrogen gas is released.

What is an alloy?

Alloy is a homogeneous mixture of two or more metals or of a metal and one or more non-metals

Physical Properties of Metals

Physical State:Metals are generally solids at room temperature. Mercury (Hg) is the only exception which is liquid at room temperature.
Malleability:Metals can be spread by hammered or beaten into thin sheets, without breaking because metallic bonds in the metals do not break easily. Gold (Au), silver (Ag) are highly malleable elements.
Ductility:Ability of the metals to be melted and drawn into thin wires is called ductility.
Lustre:Metals generally shine brilliantly and can be highly polished. The electronic structure of metals is such that the metals are able to reflect incident light. This characteristic metallic feature is called lustre.
Conductor:In metals, the bonds are formed by excess or free electrons moving around large array of atoms. These electrons are able to conduct electricity and heat.



Density of Metals

Density of metals is high. Only sodium (Na) and potassium (K) have densities less than water. Thus all metals are hard meterials except sodium, potassium and lead which are soft metals.