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

Which of the following property is not responsible for copper to be used as “Electrical Conduction wires”?

[A]. Ductility
[B]. Colour
[C]. Good conductor of electricity
[D]. It is solid
Q2

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]. Sodium oxide which turns red litmus blue.
[B]. Magnesium Hydroxide which turns red litmus to blue.
[C]. When iron reacts with oxygen and water it quickly forms iron oxide.
[D]. Iron oxides are basic in nature.
Q3

Paheli is writing some statements but she confused to know whether the statements are incorrect? Would you help her?

[A]. Tungsten metals are used for making the filament of electric bulbs.
[B]. We cannot hold a hot metal pan directly.
[C]. Silver is the best conductor of electricity.
[D]. None of the above.




Q4

Boojho has learnt that nonmetals on beating with the hammer are generally broken into pieces. Which of the following is non-metal?

[A]. Iron nail
[B]. Aluminum wire
[C]. Copper plate
[D]. Piece of coal
Q5

How do we get “Sulfuric Acid”?

[A]. When sulphur burns in acidic air.
[B]. When sulphur burns under acidic water.
[C]. When ash of sulphur dissolve in water.
[D]. When hydrogen and oxygen both reacts with sulphur.
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.