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Test: Basic Units Of Matter - Class 9 MCQ


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

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Test: Basic Units Of Matter - Question 1

State whether the following statement is True or False:

Molecules of compounds are made up of the same type of atoms.

Detailed Solution for Test: Basic Units Of Matter - Question 1
  • Molecules of compounds are not made up of the same type of atoms. They are actually made up of different types of atoms in definite proportions. This means that compounds like water (H2O) and carbon dioxide (CO2>) consist of varying types of atoms.
Test: Basic Units Of Matter - Question 2

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 2

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.

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Test: Basic Units Of Matter - Question 3

Cl2 stands for:

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

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 4

Ancient Indian philosopher Maharishi Kanad suggested that matter could be divided into smaller particles until reaching an indivisible unit called "_____".

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

Maharishi Kanad, an ancient Indian philosopher, proposed that matter could be divided into smaller particles until reaching an indivisible unit called "Parmanu." This idea helped in understanding how matter is composed of tiny building blocks that cannot be divided further.

Test: Basic Units Of Matter - Question 5

Molecules can exist in free state because:

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

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 6

State whether the following statement is True or False:

Atoms of a given element are different in mass and chemical properties.

Detailed Solution for Test: Basic Units Of Matter - Question 6
  • Atoms of a given element are actually identical in mass and chemical properties. This means that all atoms of the same element have the same mass and behave in the same way chemically. It's like having a bunch of identical Lego blocks that are all the same size and shape. So, the statement is False because atoms of the same element are not different, but they are the same.
Test: Basic Units Of Matter - Question 7

Which constituent of air is monoatomic?

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

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 8
Molecules of compounds are made up of different types of atoms in ______ proportions.
Detailed Solution for Test: Basic Units Of Matter - Question 8
Molecules of compounds are made up of different types of atoms in definite proportions, which means they always combine in fixed and specific ratios to form compounds.
Test: Basic Units Of Matter - Question 9

What are the building blocks of matter?

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

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 10

Which atom is the smallest atom of all?

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

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

Test: Basic Units Of Matter - Question 11

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

Detailed Solution for Test: Basic Units Of Matter - Question 11

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 12

Study of internal structure of Earth is known as

Detailed Solution for Test: Basic Units Of Matter - Question 12

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 13

What does the Law of Constant Proportions tell us about chemical compounds?

Detailed Solution for Test: Basic Units Of Matter - Question 13
  • The Law of Constant Proportions teaches us that chemical compounds, like water or ammonia, always keep the same elements in the same proportion by weight no matter where they come from or how they are made. This means that in water, for example, there will always be a fixed ratio of hydrogen to oxygen, and in ammonia, nitrogen to hydrogen will always be in a set proportion.
Test: Basic Units Of Matter - Question 14

How do atoms usually exist in nature?

Detailed Solution for Test: Basic Units Of Matter - Question 14

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

Test: Basic Units Of Matter - Question 15

Which of the following can be used to see atoms?

Detailed Solution for Test: Basic Units Of Matter - Question 15

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.

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