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Lakhmir Singh & Manjit Kaur Test: Matter in Our Surrounding - Grade 9 MCQ


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15 Questions MCQ Test - Lakhmir Singh & Manjit Kaur Test: Matter in Our Surrounding

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Lakhmir Singh & Manjit Kaur Test: Matter in Our Surrounding - Question 1

What is the physical state of water at 100°C?

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Matter in Our Surrounding - Question 1

At 100°C, water exists in both the liquid state as well as in gaseous state. This is special condition because 100°C is the boiling point of water and as well as liquefaction temperature of the water vapour

Lakhmir Singh & Manjit Kaur Test: Matter in Our Surrounding - Question 2

An Almirah is a solid because its

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Matter in Our Surrounding - Question 2

An almirah is solid because it is hard and rigid, have fixed shape and have very high density. All these properties are possessed by solid substance only.

Lakhmir Singh & Manjit Kaur Test: Matter in Our Surrounding - Question 3

Find the incorrect statement

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Matter in Our Surrounding - Question 3

The normal room temperature is 298 K and 293 K both" is incorrect. Normal room temperature is typically defined as 298 K (25°C). While 293 K (20°C) is sometimes used in specific contexts, it is not standard to say both are normal room temperature simultaneously.

Lakhmir Singh & Manjit Kaur Test: Matter in Our Surrounding - Question 4

Which of the following does not affect rate of evaporation?

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Matter in Our Surrounding - Question 4

Factors Affecting Rate of Evaporation
Wind Speed: Higher wind speeds can increase the rate of evaporation by carrying away the water vapor molecules from the surface, creating a lower concentration of water vapor around the liquid. This allows more water molecules to evaporate.
Surface Area: A larger surface area can increase the rate of evaporation as more liquid molecules are exposed to the air, allowing for more evaporation to occur.
Temperature: Higher temperatures can increase the rate of evaporation as the kinetic energy of the liquid molecules increases, leading to more molecules escaping into the air.
Insoluble Heavy Impurities: Insoluble heavy impurities do not affect the rate of evaporation. These impurities remain in the liquid and do not impact the evaporation process. The rate of evaporation is primarily influenced by factors such as wind speed, surface area, and temperature.

Lakhmir Singh & Manjit Kaur Test: Matter in Our Surrounding - Question 5

Convert 300K into Celsius

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Matter in Our Surrounding - Question 5

The correct option is C.
Zero on the Celsius scale (0°C) is the equivalent to 273.15K. 1-degree rise in Celsius scale is equivalent to the 1-degree rise in the Kelvin scale.
 Conversion Formula for the temperature is: C = K−273
300 - 273 =  27° C

Lakhmir Singh & Manjit Kaur Test: Matter in Our Surrounding - Question 6

Arrange the following substances in increasing order of attraction between the particles: water, sugar, oxygen.

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Matter in Our Surrounding - Question 6

Particles of solids have a very high force of attraction, particles of liquid have less force of attraction than solids and particles of gases have very less force of attraction. So the correct order of increasing attraction between particles is Oxygen, water and sugar.

Lakhmir Singh & Manjit Kaur Test: Matter in Our Surrounding - Question 7

Match the following with correct response. 

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Matter in Our Surrounding - Question 7

The change of solid directly into vapours is called  Sublimation. The change of liquid state into vapours without coming to it's boiling point is called Evaporation. The latent heat of Vaporization is the heat required to change the state of 1 kg into vapours. Latent heat of fusion is the heat required to Change the state of 1 kg of solid  into liquid.

Lakhmir Singh & Manjit Kaur Test: Matter in Our Surrounding - Question 8

Name the state of matter that ‘has minimum interparticle attraction’

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Matter in Our Surrounding - Question 8

Gases have no definite shape and volume and are highly incompressible. solid poses rigidity and liquid and gases possess fluidity.

Lakhmir Singh & Manjit Kaur Test: Matter in Our Surrounding - Question 9

As the temperature of a solid increases, the particles gain more kinetic energy and start vibrating vigorously. Eventually, the forces of attraction between the particles are overcome and the solid changes into a liquid. The minimum temperature at which this happens (at atmospheric pressure) is called the:

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Matter in Our Surrounding - Question 9

Melting point is defined as the temperature at which a solid turns into a liquid under atmospheric pressure.

Lakhmir Singh & Manjit Kaur Test: Matter in Our Surrounding - Question 10

Which of the following correctly describes the relative spaces between particles and their kinetic energy in the three states of matter?

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Matter in Our Surrounding - Question 10

In solids, particles are closely packed (very little space between them) and have the least kinetic energy.

In liquids, particles have moderate spacing and intermediate kinetic energy.

In gases, particles are far apart and move very rapidly, having the most kinetic energy.

Lakhmir Singh & Manjit Kaur Test: Matter in Our Surrounding - Question 11

Which of the following statements is true regarding the spaces and kinetic energy of particles in different states of matter?

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Matter in Our Surrounding - Question 11

Answer: B) The spaces between the particles and the kinetic energy are minimum in solids, intermediate in liquids, and maximum in gases.

Lakhmir Singh & Manjit Kaur Test: Matter in Our Surrounding - Question 12

The latent heat of vaporisation is the amount of heat energy required to:

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Matter in Our Surrounding - Question 12

The correct answer is:

c) Convert 1 kg of a liquid into gas at its boiling point, without changing its temperature

Explanation:

  • Latent heat of vaporization is the heat energy required to change 1 kg of a liquid into a gas at its boiling pointwithout any temperature change.

  • This energy is used to overcome the intermolecular forces and convert the liquid into a gaseous state.

Why Not the Other Options?

  • a) Describes specific heat capacity, not latent heat.

  • b) Refers to latent heat of fusion (solid to liquid).

  • d) Incorrect—latent heat does not involve temperature change.

Thus, the correct choice is (c).

Lakhmir Singh & Manjit Kaur Test: Matter in Our Surrounding - Question 13

Statement A: Celsius scale is the best scale for measuring temperature. 
Statement B: CO2 (liquid state) is stored under high pressure.
Which of the two statements is true?

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Matter in Our Surrounding - Question 13

Statement A ("Celsius scale is the best scale for measuring temperature") is subjective and incorrect in a scientific context, as the Kelvin scale is the SI unit for temperature and preferred for scientific measurements. Statement B ("CO₂ (liquid state) is stored under high pressure") is true, as liquid CO₂ requires high pressure to remain stable. 
Thus, only statement B is true.

Lakhmir Singh & Manjit Kaur Test: Matter in Our Surrounding - Question 14

Find the incorrect statement

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Matter in Our Surrounding - Question 14
  • a) Solids have negligible K.E. of the particles.

    • Correct. In solids, particles vibrate in fixed positions with very low kinetic energy (K.E.).

  • b) Gases have maximum fluidity and least rigidity.

    • Correct. Gases flow easily (high fluidity) and have no rigidity.

  • c) Potassium permanganate is orange in colour.

    • Incorrect. Potassium permanganate (KMnO₄) is deep purple (violet) in colour, not orange.

  • d) Inter-particle attraction depends on the physical state of the matter.

    • Correct. Solids > Liquids > Gases in terms of inter-particle attraction.

Lakhmir Singh & Manjit Kaur Test: Matter in Our Surrounding - Question 15

What is the physical state of water at 10°C?

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Matter in Our Surrounding - Question 15

The physical state of water at 10°C is liquid state. Below 0°C water is in solid state and above 100°C water is in vapour state.

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