Matter in Our Surrounding Test

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Matter in Our Surrounding Test - 22

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Weekly Quiz Competition

Question 1
1 / -0

Which condition out of the following will increase the evaporation of water?

A
Increase in temperature of water

B
Adding common salt to water

C
Less exposed surface area of water

D
Decrease in temperature of water

Solution

The various factors that increase the rate of evaporation of water are:
1. Increase in temperature
2. Increase in exposed surface area
3. Increase in wind speed
Evaporation decreases due to the presence of impurities in water, like the presence of salt in water.

So, from the given options, only increase in temperature will increase the rate of evaporation.
Question 2
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Which one will not increase the rate of evaporation of a liquid?

A
Increase in temperature

B
Increase in humidity

C
Increase in surface area

D
Increase in wind speed

Solution

The various factors that increase the rate of evaporation of water are:
1. Increase in temperature
2. Increase in exposed surface area
3. Increase in wind speed

So, from the given options, increase in temperature, surface area and wind speed will increase the rate of evaporation. Humidity does not.

Humidity refers to the amount of moisture or water vapour in the air. If the humidity is high and the surrounding air is already saturated with water vapour, air's moisture intake will reduce. Consequently, the rate of evaporation reduces.
Question 3
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Which of the following statements is correct?

A
Intermolecular forces of attraction in solids are maximum.

B
Intermolecular forces of attraction in gases are minimum.

C
Intermolecular spaces in solids are minimum.

D
All of the above

Solution

Solids have strong intermolecular forces of attraction because of which the intermolecular spacing in solids is minimum. While gases have the weakest intermolecular forces of attraction due to which they remain widely separated.
Question 4
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Crystallisation technique is better than simple evaporation technique as __________.

A
some solids get evaporated with solvent during evaporation.

B
some solids decompose or some may get charred on heating to dryness.

C
some impurities may remain dissolved in the solution even after filtration, which on evaporation contaminate the solid.

D
both (B) and (C).

Solution

Crystallisation is a process that separates a pure solid in the form of its crystals from a solution. Crystallisation is better than evaporation because during Evaporation. Some solids decompose or some, like sugar, may get charred on heating to dryness. Some impurities may remain dissolved in the solution even after filtration which on evaporation contaminates the solid.\

Impure solids are obtained by evaporation and are further purified by crystallisation. e.g. salt obtained from the sea is further purified by this method. In some cases e.g. sugar crystal cannot be obtained by simple evaporation technique because sugar gets charred on heating to dryness. In such cases, the crystallisation technique is applied.
Question 5
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Heat of fusion is the process of conversion of:

A
liquid into gas

B
solid into gas

C
solid into liquid

D
liquid into solid

Solution

The heat of fusion is the heat required for a substance to change its state from solid to liquid. The process is called fusion or melting.
Question 6
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Inter-particle spaces are minimum in:

A
gases

B
liquids

C
solids

D
gases and solids

Solution

Inter-particle spaces are minimum in solids, due to which solids are generally densely packed. Liquids have more inter-particle spaces than solids and gases have the maximum inter-particle spaces between them.
Hence, option $$C$$ is correct.
Question 7
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Liquids can be poured easily whereas solids cannot be pour because of:

A
less intermolecular forces of attraction

B
negligible intermolecular space

C
vibratory movement of molecules

D
all the above

Solution

We can pour liquid from one container into another because in, liquids the particles are less densely packed as they have less force of attraction than solid molecules. This gives them the ability to move around and slide past each other.
But, solid particles are closely packed due to the strong force of attraction between the molecules, and so, they cannot move. Thus we cannot pour solids from one container to another.
Hence, the correct option is $$\text{A}$$
Question 8
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Rinku and Pinku had half day schools during summer. They used to go to school by autorickshaw. They observed that the auto driver covered the top of the vehicle by some mats and sprinkled water on them regularly, which keeps it cool. Which of the following phenomena is involved here?

A
Condensation

B
Evaporation

C
Sublimation

D
Diffusion

Solution

Evaporation is the phenomena involved as it makes the surroundings cooler by removing heat inside the auto-rickshaw.
Question 9
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Which among the following statements is true?

A
The rate of evaporation in a coastal area is less because of high humidity

B
The rate of evaporation in a coastal area is more because of presence of water bodies

C
The rate of evaporation is independent of humidity

D
The rate of evaporation is directly proportional to humidity

Solution

The rate of evaporation in a coastal area is less because of high humidity. High humidity represents higher concentration of water vapour in the air due to which temperature of the surrounding atmosphere decreases and the rate of evaporation also decreases.
Question 10
1 / -0

Maximum intermolecular force of attraction exists in:

A
bromine

B
Nitrogen

C
oxygen

D
copper

Solution

Force of attraction increases in the order Gas < Liquid < Solid

Nitrogen and Oxygen are gases

Bromine is a liquid

Copper is a solid

Hence, option $$D$$ is the correct answer.

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Matter in Our Surrounding Test - 22

Result

Matter in Our Surrounding Test - 22

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SHARING IS CARING

Question 1

Increase in temperature of water

Adding common salt to water

Less exposed surface area of water

Decrease in temperature of water

Solution

Question 2

Increase in temperature

Increase in humidity

Increase in surface area

Increase in wind speed

Solution

Question 3

Intermolecular forces of attraction in solids are maximum.

Intermolecular forces of attraction in gases are minimum.

Intermolecular spaces in solids are minimum.

All of the above

Solution

Question 4

some solids get evaporated with solvent during evaporation.

some solids decompose or some may get charred on heating to dryness.

some impurities may remain dissolved in the solution even after filtration, which on evaporation contaminate the solid.

both (B) and (C).

Solution

Question 5

liquid into gas

solid into gas

solid into liquid

liquid into solid

Solution

Question 6

gases

liquids

solids

gases and solids

Solution

Question 7

less intermolecular forces of attraction

negligible intermolecular space

vibratory movement of molecules

all the above

Solution

Question 8

Condensation

Evaporation

Sublimation

Diffusion

Solution

Question 9

The rate of evaporation in a coastal area is less because of high humidity

The rate of evaporation in a coastal area is more because of presence of water bodies

The rate of evaporation is independent of humidity

The rate of evaporation is directly proportional to humidity

Solution

Question 10

bromine

Nitrogen

oxygen

copper

Solution

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