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

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
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

How do we get “Copper Hydroxide”?

[A]. When copper burns in air.
[B]. When copper reacts with hydrogen and oxygen.
[C]. When copper reacts with carbon dioxide.
[D]. When copper reacts with water, carbon dioxide and oxygen.
Q4

Metals generally react with dilute acids to produce hydrogen gas. Which of the following metals does not react with dilute hydrochloric acid:

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




Q5

Metals are generally hard. Which of the following metals is an exception and can be cut with a knife?

[A]. Iron
[B]. Sodium
[C]. Gold
[D]. Magnesium
Q6

Which of the following statement is or are correct?

[A]. Solid non-metals are usually neither hard not strong.
[B]. Non-metals cannot be cut easily.
[C]. Non-metals have usually low melting point and high boiling points.
[D]. All the above.




Q7

Paheli is writing some statements, choose the incorrect statements and help her:

[A]. Elements can be broken down by applying heat, light or electricity.
[B]. There are 92 naturally occurring elements known to us at present.
[C]. All the metals have similar properties.
[D]. The properties non-metals are opposite of metals.
Q8

The substance that will be flattened on beating with a hammer is:

[A]. Crystal of iodine
[B]. Lump of sulphur
[C]. Piece of coal
[D]. Zinc granules



Q9

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.
Q10

Consider the following statements and choose the incorrect one:

[A]. Atom is the smallest part of an element.
[B]. An element is a substance which is made up of only one kind of atoms.
[C]. An atom of liquid sulphur or vapour forms of sulphur would be different as that of solid sulphur.
[D]. Oxygen and nitrogen are two examples of elements.



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.