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Olympiad Test: Matter in Our Surroundings- 3 - Class 9 MCQ


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10 Questions MCQ Test - Olympiad Test: Matter in Our Surroundings- 3

Olympiad Test: Matter in Our Surroundings- 3 for Class 9 2024 is part of Class 9 preparation. The Olympiad Test: Matter in Our Surroundings- 3 questions and answers have been prepared according to the Class 9 exam syllabus.The Olympiad Test: Matter in Our Surroundings- 3 MCQs are made for Class 9 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Olympiad Test: Matter in Our Surroundings- 3 below.
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Olympiad Test: Matter in Our Surroundings- 3 - Question 1

When a gas jar full of air is placed upside down on a gas jar full of bromine vapours, the red–brown vapours of bromine from the lower jar go upward into the jar containing air. In this experiment

Detailed Solution for Olympiad Test: Matter in Our Surroundings- 3 - Question 1
When a gas jar full of air is placed upside down on a gas jar full of bromine vapours, the red-brown vapours of bromine from the lower jar go upward into the jar containing air. In this experiment, Bromine vapour (or bromine gas) is red-brown in colour, and it is heavier than air ; therefore it is settling in bottom of apparatus and air is rising at the top of apparatus.

Olympiad Test: Matter in Our Surroundings- 3 - Question 2

Seema took a 100 mL beaker and filled half the beaker with water and marked the level of water.

She dissolved some salt with the help of a glass rod and recorded water level again. Choose the correct observation related to above activity

Detailed Solution for Olympiad Test: Matter in Our Surroundings- 3 - Question 2
When salt is dissolved in water, the particles of salt disappear in water. This happen because particles of salt get adjusted in the space b/w the particles of water.

Additionally, you will notice that there is no rise of water level take place when one or more teaspoons of salt is added in the glass of water, this is because salt particles get adjusted in the space b/w the particles of water and no rise in the water level comes in result.

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Olympiad Test: Matter in Our Surroundings- 3 - Question 3

Which one of the following statements is not true?

Detailed Solution for Olympiad Test: Matter in Our Surroundings- 3 - Question 3
Molecules have arrangement

• In gas are well separated with no regular arrangement.

• In liquid are close together with no regular arrangement.

• In solid are tightly packed, usually in a regular pattern.

Olympiad Test: Matter in Our Surroundings- 3 - Question 4

Which of the following process/ processes release heat?

(i) Condensation (ii) Vaporisation

(iii) Freezing (iv) Melting

Detailed Solution for Olympiad Test: Matter in Our Surroundings- 3 - Question 4
Condensation and freezing release heat that lead to a decrease in kinetic energy of molecules. When the substance gets cool enough its particles become slower or stop their movement and change their phase into liquid and solid on condensing and freezing respectively.
Olympiad Test: Matter in Our Surroundings- 3 - Question 5

Which of the following factors are responsible for the change in state of solid carbon dioxide when kept exposed to air?

(i) Increase in pressure (ii) Increase in temperature

(iii) Decrease in pressure (iv) Decrease in temperature

Detailed Solution for Olympiad Test: Matter in Our Surroundings- 3 - Question 5
Solid carbon dioxide can be changed into vapour or gaseous state by decreasing the pressure and increasing the temperature. Both the processes increase the inter-particle spaces in the solid carbon dioxide.
Olympiad Test: Matter in Our Surroundings- 3 - Question 6

One of the following does not undergo sublimation. This one is

Detailed Solution for Olympiad Test: Matter in Our Surroundings- 3 - Question 6
Sublimation is the transition of a substance directly from the solid to the gas phase without passing through the intermediate liquid phase. Iodine and ammonium chloride produces fumes on gentle heating while sodium chloride does not sublime.
Olympiad Test: Matter in Our Surroundings- 3 - Question 7

Ice floats on water because

Detailed Solution for Olympiad Test: Matter in Our Surroundings- 3 - Question 7
When water freezes into its solid form, the molecules can form more stable hydrogen bonds, locking them into positions. As the molecules are not moving, they cannot form as many hydrogen bonds as other water molecules. This leads to ice water molecules not being as close together as in liquid water, thus reducing its density.
Olympiad Test: Matter in Our Surroundings- 3 - Question 8

Which of the following has minimum kinetic energy?

Detailed Solution for Olympiad Test: Matter in Our Surroundings- 3 - Question 8

Kinetic energy is the energy that an object contains in itself because of its motion. The reason is that steam is in the form of gases in which the particles of gases are much apart from one another. The space between the particles of gases is very large. When we heated the particles of gases, it can move very rapidly. Hence, its kinetic energy is maximum.

Olympiad Test: Matter in Our Surroundings- 3 - Question 9

Convert the temperature of 300 k to the Celsius scale

Detailed Solution for Olympiad Test: Matter in Our Surroundings- 3 - Question 9

Temperature on Celsius scale = Temperature

on Kelvin scale – 273

= 300 – 273

= 27°C

Olympiad Test: Matter in Our Surroundings- 3 - Question 10

Particles of matter are

Detailed Solution for Olympiad Test: Matter in Our Surroundings- 3 - Question 10
Particles of matter are continuously moving.

For example, the smell of deodorant travels in the whole room if it is used on one side of the room.

Hence, the correct option is B.

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