Matter In Our Surrounding 9th Class

2.

Density is measured in ________

Explanation
Density is a measure of how much mass is contained in a given volume. It is calculated by dividing the mass of an object by its volume. The unit for density is kilograms per cubic meter (kg/m³), which represents the amount of mass in kilograms that is present in each cubic meter of space. Therefore, the correct answer is kg per cubic meter.

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3.

________metal is liquid at room temperature

Explanation
Mercury is a metal that is liquid at room temperature. Unlike most other metals, which are solid at room temperature, mercury has a low melting point of -38.83 degrees Celsius (-37.89 degrees Fahrenheit). This unique property is due to the weak metallic bonding between its atoms, allowing them to move more freely and giving mercury its liquid state.

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4.

Which of following has highest density

Water
Kerosene oil
Iron
Lead

Correct Answer

A. Lead

Explanation

Lead has the highest density among the given options. Density is defined as the mass of a substance per unit volume. Lead is a dense metal with a high atomic mass, which contributes to its high density. Water, kerosene oil, and iron have lower densities compared to lead.

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5.

Gases have highest rate of diffusion among all the three states of matter.

True
False

Correct Answer

A. True

Explanation

Gases have the highest rate of diffusion among all the three states of matter because their particles are in constant random motion and are far apart from each other. This allows them to spread out and mix with other gases more easily compared to liquids or solids. In liquids, the particles are closer together and in constant motion, but not as fast as in gases. Solids have the slowest rate of diffusion because their particles are tightly packed and have limited mobility. Therefore, the statement is true.

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6.

Which one of the following are homogeneous mixture

Option 1
Option 2

Correct Answer

A. Option 1

Explanation

Option 1 is a homogeneous mixture because it consists of a single phase and its components are uniformly distributed throughout. This means that the composition of Option 1 is the same throughout the entire sample. In contrast, Option 2 may be a heterogeneous mixture because it could contain multiple phases and its components may not be evenly distributed. Therefore, Option 1 is the correct answer as it meets the criteria for a homogeneous mixture.

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7.

Convert 273 kelvin to celsius ________ approx.

Correct Answer
0

Explanation
To convert Kelvin to Celsius, we need to subtract 273 from the given value. In this case, 273 Kelvin minus 273 equals 0 Celsius. Therefore, the approximate Celsius value for 273 Kelvin is 0.

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Matter In Our Surrounding 9th Class

Density=

Quiz Preview

Density is measured in ________

________metal is liquid at room temperature

Which of following has highest density

Gases have highest rate of diffusion among all the three states of matter.

Which one of the following are homogeneous mixture

Convert 273 kelvin to celsius ________ approx.