Matter in Our Surrounding Test

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Matter in Our Surrounding Test - 23

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Weekly Quiz Competition

Question 1
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An earthenware keeps water cool but a metallic vessel does not because:

A
earthenware has pores.

B
metals are good thermal conductors

C
metal wares are heat resistant.

D
earthen wares are impervious.

Solution

An earthenware keeps water cool but a metallic vessel does not because earthenware has pores. Because of these pores, some of the water can easily evaporate through them, because of this evaporation the water inside is kept cool. This is not possible in a metallic vessel.
Hence, the correct option is $$\text{A}$$
Question 2
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Evaporation occurs only:

A
after boiling

B
after extreme cooling

C
at the surface of a liquid

D
if boiling occurs at atmospheric pressure

Solution

Evaporation is a type of vaporization of a liquid that occurs from the surface of the liquid into the gaseous phase. It is a surface phenomenon that only takes place on the surface of the liquid.
Question 3
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The rate of evaporation decreases with an increase in _________.

A
humidity

B
temperature

C
wind speed

D
surface area

Solution

Evaporation is a type of vaporization of liquid that occurs from the surface of liquid, to gaseous phase that is not saturated with the evaporating substance. If the air is saturated with great amount of water causing high humidity, it decreases the rate of evaporation of water.
Question 4
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One small crystal of potassium permanganate can colour large volume of water. This proves that ____________.

A
matter is made up of wave

B
matter is made up of tiny particles

C
matter is made up of large particles

D
matter cannot be divided further

Solution

This experiment proves that matter is made up of tiny particles which spread through the solution making it coloured.
Hence, the correct option is $$\text{B}$$.
Question 5
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Which of the following activity proves that particles of matter have space between them?

A
Dissolution of sugar into water

B
Dilution of potassium permanganate solution

C
Breaking the stream of water

D
None of the above

Solution

The dissolution of sugar into water proves that particles of matter have space between them as the sugar particles get trapped in the molecules of water.
Hence the correct option is A.
Question 6
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When sugar is dissolved in water, the level of water _________.

A
increases

B
decreases

C
remains same

D
none of the above

Solution

The level of water remains same as the sugar particles gets into the spaces between water molecules therefore the level of water remains same.
Question 7
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When salt is dissolved in water _______________.

A
the particles of water get into the spaces between particles of salt

B
the particles of salt get into the spaces between particles of water

C
the particles of salt sit on the top of particles of water

D
the particles of water sit on the top of particles of salt

Solution

When salt is dissolved in water, the particles of salt get into the spaces between particles of water and start dissolving and disappear.

Hence, the correct option is B.
Question 8
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Which is more effective in cooling?

A
Ice at $$0^0 C$$

B
Water at $$0^0 C$$

C
Water at $$100^0 C$$

D
Ice at $$100^0 C$$

Solution

Ice is more effective than water in cooling liquids because ice needs additional energy to convert itself to water at zero degree celsius. Thus it absorbs more heat from the liquid system making the liquid system cooler so ice at $$0^0C$$ is cooler than water at $$0^0C$$.
Question 9
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Early philosophers classified matter in the form of __________ basic elements.

A
one

B
two

C
three

D
five

Solution

Early philosophers classified matter in the form of five basic elements (Panchatatva).

They are air, water, earth, fire, sky.

Hence, the correct option is D.
Question 10
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Which one of the following factors do not affect the rate of evaporation?

A
Temperature of the liquid

B
Humidity of the surrounding air

C
Depth of the liquid

D
Surface of the liquid

Solution

Substance or liquid that has a larger surface area will evaporate faster as there are more surface molecules per unit of volume that are potentially able to escape.
The higher the temperature of substance or liquid, the greater is the kinetic energy of the molecules at its surface, and therefore the faster the rate of evaporation.
If the air is saturated with a great amount of water causing high humidity, it causes low capacity for the evaporating substance.
Hence, option C is the answer.

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Re-Attempt Weekly Quiz Competition

Matter in Our Surrounding Test - 23

Result

Matter in Our Surrounding Test - 23

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SHARING IS CARING

Question 1

earthenware has pores.

metals are good thermal conductors

metal wares are heat resistant.

earthen wares are impervious.

Solution

Question 2

after boiling

after extreme cooling

at the surface of a liquid

if boiling occurs at atmospheric pressure

Solution

Question 3

humidity

temperature

wind speed

surface area

Solution

Question 4

matter is made up of wave

matter is made up of tiny particles

matter is made up of large particles

matter cannot be divided further

Solution

Question 5

Dissolution of sugar into water

Dilution of potassium permanganate solution

Breaking the stream of water

None of the above

Solution

Question 6

increases

decreases

remains same

none of the above

Solution

Question 7

the particles of water get into the spaces between particles of salt

the particles of salt get into the spaces between particles of water

the particles of salt sit on the top of particles of water

the particles of water sit on the top of particles of salt

Solution

Question 8

Ice at $$0^0 C$$

Water at $$0^0 C$$

Water at $$100^0 C$$

Ice at $$100^0 C$$

Solution

Question 9

one

two

three

five

Solution

Question 10

Temperature of the liquid

Humidity of the surrounding air

Depth of the liquid

Surface of the liquid

Solution

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