Class 9 Exam  >  Class 9 Tests  >  Science Class 9  >  Test: Basic Units Of Matter - Class 9 MCQ

Test: Basic Units Of Matter - Class 9 MCQ


Test Description

10 Questions MCQ Test Science Class 9 - Test: Basic Units Of Matter

Test: Basic Units Of Matter for Class 9 2024 is part of Science Class 9 preparation. The Test: Basic Units Of Matter questions and answers have been prepared according to the Class 9 exam syllabus.The Test: Basic Units Of Matter MCQs are made for Class 9 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Basic Units Of Matter below.
Solutions of Test: Basic Units Of Matter questions in English are available as part of our Science Class 9 for Class 9 & Test: Basic Units Of Matter solutions in Hindi for Science Class 9 course. Download more important topics, notes, lectures and mock test series for Class 9 Exam by signing up for free. Attempt Test: Basic Units Of Matter | 10 questions in 10 minutes | Mock test for Class 9 preparation | Free important questions MCQ to study Science Class 9 for Class 9 Exam | Download free PDF with solutions
1 Crore+ students have signed up on EduRev. Have you? Download the App
Test: Basic Units Of Matter - Question 1

What are the building blocks of matter?

Detailed Solution for Test: Basic Units Of Matter - Question 1

The most fundamental building block of matter was a particle called the atom. Now we know that the atom is made of many smaller pieces, known as subatomic particles. Every atom contains a central core called the nucleus, made of particles called protons and neutrons.

Test: Basic Units Of Matter - Question 2

How do atoms usually exist in nature?

Detailed Solution for Test: Basic Units Of Matter - Question 2

Atoms usually exist in two ways (1) in the form of molecules (2) in the form of ions 

Test: Basic Units Of Matter - Question 3

Which atom is the smallest atom of all?

Detailed Solution for Test: Basic Units Of Matter - Question 3

The atom with the smallest mass is the hydrogen atom; its mass is about 10-27 kg. 

Test: Basic Units Of Matter - Question 4

Which of the following can be used to see atoms?

Detailed Solution for Test: Basic Units Of Matter - Question 4

A scanning tunneling microscope (STM) is an instrument for imaging surfaces at the atomic level. Its development in 1981 earned its inventors, Gerd Binnig and Heinrich Rohrer (at IBM Zrich), the Nobel Prize in Physics in 1986. For an STM, good resolution is considered to be 0.1 nm lateral resolution and 0.01 nm (10 pm) depth resolution.With this resolution, individual atoms within materials are routinely imaged and manipulated. The STM can be used not only in ultra-high vacuum but also in air, water, and various other liquid or gas ambients, and at temperatures ranging from near zero kelvin to over 1000 DEGC.

Test: Basic Units Of Matter - Question 5

The number of atoms present in one molecule of an element is called as:

Detailed Solution for Test: Basic Units Of Matter - Question 5

Atomicity is the total number of atoms present in one molecule of an element or a compound. For example: one molecule of hydrogen (H2) contains two atoms of hydrogen. Therefore, atomicity of hydrogen is 2. Simialrly, 1 molecule of O3 contains 3 atoms. Therefore, its atomicity  is 3. molecule of Argon exist as Ar and hence its a monoatomic compound.

Test: Basic Units Of Matter - Question 6

Study of internal structure of Earth is known as

Detailed Solution for Test: Basic Units Of Matter - Question 6

A geologist is a person who studies the earth. Geologists study the structure of the Earth, and they have found that it is made up of four main parts. The earth has a solid inner core, a liquid outer core, a mantle, and a crust.hence, option (D) is correct.

Test: Basic Units Of Matter - Question 7

Cl2 stands for:

Detailed Solution for Test: Basic Units Of Matter - Question 7

Chlorine is called Cl₂ because it is a diatomic molecule.
Diatomic means there are two atoms of the same elements in the molecules.
There are other diatomic molecules, such as hydrogen (H2), Nitrogen (N2), Oxygen (O2), Fluorine (F2), Chlorine (Cl2), Bromine (Br2), Iodine (I2).

Test: Basic Units Of Matter - Question 8

Which constituent of air is monoatomic?

Detailed Solution for Test: Basic Units Of Matter - Question 8

Argon is a Noble gas. Noble gases are not very reactive since they have a very stable electron configuration. It is only about 1% of the air in the atmosphere but it is more abundant than any other element on the Periodic Table behind Nitrogen and Oxygen.

Test: Basic Units Of Matter - Question 9

Molecules can exist in free state because:

Detailed Solution for Test: Basic Units Of Matter - Question 9

A combination of atoms is called a molecule. We know that atoms of most of the elements are very reactive and cannot exist in the free state (as single atoms). This is not so with molecules. Molecules can exist in free state because they are very stable.

Test: Basic Units Of Matter - Question 10

Which is the smallest particle of an element that can take part in a chemical reaction?

Detailed Solution for Test: Basic Units Of Matter - Question 10

An atom can be defined as the smallest particle of an element, which can take part in chemical change or reaction and still retain the identity of the element. Notice that the atom is not the smallest particle of an element, as there are electrons, protons and neutrons which are smaller, but, it is the smallest which can be involved in chemical change and still retain the chemical properties of the element.

80 videos|352 docs|97 tests
Information about Test: Basic Units Of Matter Page
In this test you can find the Exam questions for Test: Basic Units Of Matter solved & explained in the simplest way possible. Besides giving Questions and answers for Test: Basic Units Of Matter, EduRev gives you an ample number of Online tests for practice
80 videos|352 docs|97 tests
Download as PDF
Download the FREE EduRev App
Track your progress, build streaks, highlight & save important lessons and more!