Matter in Our Surrounding Test

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Matter in Our Surrounding Test - 19

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Weekly Quiz Competition

Question 1
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Which condition out of the following will increase the evaporation of water?

A
Increase in temperature of water

B
Decrease in temperature of water

C
Less exposed surface area of water

D
Adding common salt to water

Solution

As the temperature of the water increases, the kinetic energy increases. As a result, the force of attraction between the molecules decreases, and the molecules become more and more separated.

Thus, increasing the temperature of a body of water also often increases evaporation. This is because as the temperature rises, the water molecules begin moving about more rapidly and will finally escape.
Question 2
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Evaporation of a liquid at room temperature leads to _________ on the liquid surface.

A
heating

B
cooling

C
vapours

D
precipitation

Solution

Evaporation is a surface phenomenon. When the liquid starts boiling, the molecules of the liquid which are present at the upper level have maximum kinetic energy. Because of that, they overcome the intermolecular forces of attraction, and evaporation starts. As, the faster-moving molecule having maximum kinetic energy escapes, the temperature of the liquid decreases, and the liquid starts cooling.
Question 3
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Which of the following are the constituents of matter?

A
(i) and (ii) only

B
(i) and (iii) only

C
(ii) and (iii) only

D
(i), (ii) and (iii)

Solution

Constituents of matter are atoms and molecules.

Hence, option $$A$$ is correct.
Question 4
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During summer season, water kept in an earthen pot becomes cool because of the phenomenon of :

A
diffusion

B
transpiration

C
osmosis

D
evaporation

Solution

An earthen pot (matka) has small pores in it. Water seeps through these pores and reaches the outer surface of the earthen pot. This water then evaporates by taking heat from the earthen pot, thereby making it cooler.

Thus, option D is the correct answer.
Question 5
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What happens when a solid melts?

A
Its molecules move faster

B
Its molecules move closer together

C
The movement of its molecules decreases

D
The temperature decreases although heat is added
Solution
Hint: There is a change in state on heating of a solid

Explanation for Correct Answer:
- Solid-state has the least intermolecular space and most packed structure.
- On heating of a solid, the intermolecular forces decrease, space between the molecules increases.
- The particles gain energy and there is an increase in kinetic energy and the molecules move faster.
Explanation for Incorrect Answer:
- On heating the movement of molecules increases.
- During melting we are adding heat to it so the temperature will increase.
Final Option: $$A$$
Question 6
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What happens to a substance when the space between its particles is decreased?

A
The volume of the substance is increased.

B
The volume of the substance is decreased.

C
The mass of the substance is increased.

D
The mass of the substance is decreased.

Solution

When the inter-molecular space between the particles is decreased, the intermolecular force of attraction will increase which will result in a decrease in the volume.
Hence, the correct option is $$(B)$$.
Question 7
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Choose the correct option for arrangement in the order indicated for solids, liquids, and gases :
(i) Decreasing order - empty space between
(ii) Increasing order - the tendency to flow

A
(i) Solid > Liquid > Gases (ii) Gases < Liquid < Solids

B
(i) Solids > Liquids > Gases (ii) Solids < Gases < Liquids

C
(i) Gases > Liquids > Solids (ii) Solids < Liquids < Gases

D
(i) Solids > Gases > Liquids (ii) Gases < Solids < Liquids

Solution

Space between particles decreases from gases to solids. Hence, the decreasing order of empty space between the particles is $$\text{gas > liquid > solid}$$.

The tendency to flow increases from solids to gases gradually. Hence, the increasing order of tendency to flow is $$\text{solid < liquid < gas}$$.

Hence the correct option is $$(C)$$
Question 8
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All matter that is present in the universe has:

A
volume

B
mass

C
Both A and B

D
None of the above

Solution

Matter is any substance that has mass and occupies space. So, matter has mass and volume both.
Question 9
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Two balloons are filled with air and are tied to a wooden rod. Balloon P is pricked through the cellophane tape. The figure shows the situation before and after balloon P is pricked.
What can you deduce from the above activity?

A
Air occupies no space

B
Air has mass

C
Air has a fixed shape.

D
None of the above

Solution

The wooden rod which is horizontal gets disturbed when air is removed from balloon P. It proves that air has mass.
When air is filled into the balloon, it occupies the space in the balloon. This says that air occupies space. Additionally, we see that air does not have a definite shape. It just take the shape of whatever it fills.

Hence, option B is correct.
Question 10
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Which of the following statements is not true?

A
All forms of matter have volume.

B
All forms of matter have colour.

C
All forms of matter have mass.

D
All of the above are true..

Solution

Some forms of matter like air, pure water, etc., are colourless. While all forms of matter have volume, mass and can be living or non-living. Hence, all forms of matter have colour is not a true statement.
Hence, the correct option is $$(B)$$.

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Re-Attempt Weekly Quiz Competition

Matter in Our Surrounding Test - 19

Result

Matter in Our Surrounding Test - 19

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SHARING IS CARING

Question 1

Increase in temperature of water

Decrease in temperature of water

Less exposed surface area of water

Adding common salt to water

Solution

Question 2

heating

cooling

vapours

precipitation

Solution

Question 3

(i) and (ii) only

(i) and (iii) only

(ii) and (iii) only

(i), (ii) and (iii)

Solution

Question 4

diffusion

transpiration

osmosis

evaporation

Solution

Question 5

Its molecules move faster

Its molecules move closer together

The movement of its molecules decreases

The temperature decreases although heat is added

Solution

Question 6

The volume of the substance is increased.

The volume of the substance is decreased.

The mass of the substance is increased.

The mass of the substance is decreased.

Solution

Question 7

(i) Solid > Liquid > Gases (ii) Gases < Liquid < Solids

(i) Solids > Liquids > Gases (ii) Solids < Gases < Liquids

(i) Gases > Liquids > Solids (ii) Solids < Liquids < Gases

(i) Solids > Gases > Liquids (ii) Gases < Solids < Liquids

Solution

Question 8

volume

mass

Both A and B

None of the above

Solution

Question 9

Air occupies no space

Air has mass

Air has a fixed shape.

None of the above

Solution

Question 10

All forms of matter have volume.

All forms of matter have colour.

All forms of matter have mass.

All of the above are true..

Solution

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