Matter in Our Surrounding Test

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Matter in Our Surrounding Test - 7

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Weekly Quiz Competition

Question 1
1 / -0

What is the physical state of water at 100^oC?

A
Liquid

B
Solid

C
Gaseous

D
All of these

Solution

The boiling point of pure water is 100^oC or 373 K (100 ^oC = 273 + 100 = 373 K). Boiling is a bulk phenomenon. At this temperature, particles from the bulk of the liquid gain enough energy to change into the vapour state. Therefore, the physical state of water at 100^oC is water vapour (gaseous state of matter).
Question 2
1 / -0

Convert 300 K into Celsius.

A
300^∘C

B
573^∘C

C
27^∘C

D
273^∘C

Solution

Kelvin is the SI unit of temperature. To change a temperature on the Kelvin scale to the Celsius scale, 273 has to be subtracted from the given temperature. To convert a temperature on the Celsius scale to the Kelvin scale, 273 has to be added to the given temperature.

Temperature on Celsius scale = Temperature on Kelvin scale - 273

∴ ^∘C = K − 273 = 27^∘C
Question 3
1 / -0

According to ancient Indian philosophers, matter was made up of:

A
Four constituents

B
Five constituents (Panchtatvas)

C
Six constituents

D
Three constituents

Solution

Early Indian philosopher categorized matter in five types and called them panch-tatwa (Five-elements) - Vayu (Air), Jal (Water), Agni (Fire), Prithvi (Earth) and Aakash (Sky).
Question 4
1 / -0

Name the state of matter that ‘has minimum inter-particle force of attraction’

A
Solid

B
gas

C
Liquid

D
All of these

Solution

The particles of gases are away from each other. So, gas has the minimum inter-particle force of attraction.
Solids have maximum force of attraction
Question 5
1 / -0

Identify the incorrect statement.

A
Acetone is the least volatile liquid.

B
Water is the least volatile liquid.

C
Ether is a volatile liquid.

D
Alcohol is moderately volatile.

Solution

Acetone is the least volatile liquid - is incorrect. Volatile liquids are those liquids which can easily change to their vapour state at a particular temperature. Ether and Acetone are very volatile liquids. Alcohol is moderately volatile and water is the least volatile. Acetone is a solvent that has a variety of important uses and applications. E.g. It is used in nail polish remover.
Question 6
1 / -0

Which of the two statements is true?
Statement A: Celsius scale is the best scale for measuring temperature.
Statement B:CO₂ is a heavier gas than N₂ and O₂ .

A
Statement A

B
Statement B

C
Both A and B

D
Neither A nor B

Solution

(A) Kelvin is useful in scientific applications because there are no negative numbers. The lowest temperature on the Kelvin scale is 0 K. Kelvin (symbol K) is the SI unit of temperature.
(B) CO₂is a heavier gas than N₂ and O₂ (Molar mass of CO₂is 44g, that of N₂is 28g, and that of O₂is 32g) This property of CO₂is used in extinguishing a fire.
So, statement (b) is true statement.
Question 7
1 / -0

What is the physical state of water at 10⁰C ?

A
gas

B
Solid

C
Liquid

D
Ionic

Solution

The physical state of water at 10⁰C is the liquid state. Below 0⁰Cwater in solid state and above 100⁰C water in the vapour state.
Question 8
1 / -0

The room temperature on Celsius scale is 25°C . What is the temperature on the Kelvin scale?

A
298 K

B
50 K

C
300 K

D
200 K

Solution

Kelvin is the SI unit of temperature.
As we know that 0°C =273 k
So ,now to convert Celsius to kelvin ,we will add 273
to 25°c
c to k =+273
25 + 273 = 298
So ,298 K is value of 25°c.
Question 9
1 / -0

Which of the two statements is true?

Statement A: In Kelvin temperature, the symbol (∘) is not used.
Statement B: Mercury is used in glass thermometers because it does not stick with glass.

A
Statement A

B
Statement B

C
Both A and B.

D
Neither A nor B

Solution

In Kelvin temperature, the symbol (∘)is not used.

Mercury is used in glass thermometers because it does not stick with glass and have a shiny surface to view easily.
Question 10
1 / -0

Name one common substance which can undergo a change in state upon heating or cooling.

A
Diamond

B
Salt

C
Water

D
Sugar

Solution

Water can undergo a change in state upon heating and cooling. On heating above 100⁰C water change into a gaseous state and on cooling below 0⁰C it changes into the solid state.

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Matter in Our Surrounding Test - 7

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Matter in Our Surrounding Test - 7

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SHARING IS CARING

Question 1

Liquid

Solid

Gaseous

All of these

Solution

Question 2

300∘C

573∘C

27∘C

273∘C

Solution

Question 3

Four constituents

Five constituents (Panchtatvas)

Six constituents

Three constituents

Solution

Question 4

Solid

gas

Liquid

All of these

Solution

Question 5

Acetone is the least volatile liquid.

Water is the least volatile liquid.

Ether is a volatile liquid.

Alcohol is moderately volatile.

Solution

Question 6

Statement A

Statement B

Both A and B

Neither A nor B

Solution

Question 7

gas

Solid

Liquid

Ionic

Solution

Question 8

298 K

50 K

300 K

200 K

Solution

Question 9

Statement A

Statement B

Both A and B.

Neither A nor B

Solution

Question 10

Diamond

Salt

Water

Sugar

Solution

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300^∘C

573^∘C

27^∘C

273^∘C