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
|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.
Boojho is writing some statements, choose the correct statement and help him:
Consider the following statements and choose the incorrect one:
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.