Matter in Our Surrounding Test

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Matter in Our Surrounding Test - 21

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Weekly Quiz Competition

Question 1
1 / -0

Fill in the blank:
The intermolecular spaces in gases are ..... than solids.

A
more

B
less

C
same

D
None of these

Solution

Gases have very weak intermolecular forces due to which they remain widely separated but in case of solids, the intermolecular forces are strong enough to keep them in locked positions. Due to these weak forces, the gases have more intermolecular spacing than solids.
Question 2
1 / -0

Water purified by the process of evaporation and condensation can contain:

A
salt

B
sand

C
oil

D
None of the above

Solution

Most impurities have boiling points lower than that of water. During evaporation, only water evaporates leaving the impurities behind. So, when we condense the water vapour, we mostly get pure water with no impurities in it.
Hence, option $$D$$ is correct.
Question 3
1 / -0

During evaporation of liquid, ___________.

A
the temperature of the liquid falls

B
the temperature of the liquid rises

C
the temperature of the liquid remains unchanged

D
none of the above

Solution

When liquid gets evaporated from the surface of liquid they convert from liquid state to gaseous state by absorbing energy from the liquid and due to it temperature of the liquid decreases.
Question 4
1 / -0

Which of the following statements is/are correct ?

A
Inter particle spaces are maximum in the gaseous state of a substance

B
Particles which constitute gas follow a zig-zag path

C
Solid state is the most compact state of substance.

D
All are correct

Solution

In gaseous phase particles are present at a maximum distance or loosely apart from each other while solid has tightly packed particles in compact form. Particles follow a specific motion (zig-zag path) called as Brownian motion.
Question 5
1 / -0

Which of the following statements is incorrect?

A
Melting and freezing point of a substance are the same.

B
Evaporation of liquid takes place only at its boiling point.

C
Pure water has no taste.

D
Water allows sunlight to pass through it.

Solution

During evaporation, water does not convert into a gas or steam, but the random movement of molecules on the surface of the water provides some of the molecules with enough energy to escape from the surface into the air.

Hence, evaporation takes place only on the surface of the body of water at any temperature.

So, the correct option is $$B$$
Question 6
1 / -0

Identify the incorrect statement from the given definitions of solids, liquids and gases in terms of melting and boiling points.

A
A substance is said to be in solid state if under normal pressure, its melting point is above the room temperature

B
A substance is said to be in liquid state if under normal pressure, its melting point is below the room temperature

C
A substance is said to be in gaseous state if under normal pressure, its melting point is below the room temperature

D
A substance can exist in solid, liquid and gaseous state under normal pressure and room temperature

Solution

A chemical substance is defined as any material with a definite chemical composition and characteristic properties. These are often called as pure. It can exist as solids,liquids or gases at normal temperature and pressure and may change between these phases of matter with changes in temperature or pressure. Hence, under normal temperature and pressure solid, liquid and gas can not exist.
Question 7
1 / -0

Drinking of hot tea from a saucer preferred to a cup, due to:

A
Surface area

B
Material of the saucer

C
Thermal conductivity

D
Colour

Solution

The surface area of the tea poured in a saucer is more than that in the cup. The more the surface area, the more is the rate of evaporation that causes cooling effect. Therefore, the tea present in the saucer becomes cool faster than in a cup.

Hence, option A is correct.
Question 8
1 / -0

A thermometer is inserted into a beaker filled with ice at $$0^{\circ}C$$. The beaker is heated slowly. The temperature does not rise for some time. This is because:

A
ice is very cold

B
heat was used for changing ice at $$0^{\circ}C$$ to water at $$0^{\circ}C$$

C
the density of water is more than ice

D
the density of water is less than the ice

Solution

The temperature does not rise for some time because heat was used for changing ice at $$0^{\circ}C$$ to water at $$0^{\circ}C$$. When heat is given to solid ice, it first absorbs energy to convert into liquid water. After some time, when it converts into liquid water, temperature starts increasing.
Question 9
1 / -0

Which of the following energy is absorbed during the change of state of a substance?

A
Specific heat

B
Latent heat

C
Heat capacity

D
Heat of solution

Solution

Latent heat is absorbed during the change of state of a substance because it is the heat energy that has to be supplied to change the state of a substance, while the specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius.

The heat capacity of a system is defined as the amount of heat needed to raise the system's temperature by one degree.

Hence, the correct option is $$\text{B}$$
Question 10
1 / -0

Water stored in earthen pots become cool in summer because of:

A
condensation

B
evaporation

C
precipitaion

D
None of these

Solution

The water kept in an earthen pot remains cool even in summer because of evaporation. Earthen pot has a large number of tiny pores in its walls and some of the water molecules continuously keep seeping through these pores to outside the pot. This water evaporates continuously and takes the latent heat required for vaporization from the remaining water. In this way, the remaining water loses heat and gets cooled.

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Re-Attempt Weekly Quiz Competition

Matter in Our Surrounding Test - 21

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Matter in Our Surrounding Test - 21

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SHARING IS CARING

Question 1

more

less

same

None of these

Solution

Question 2

salt

sand

oil

None of the above

Solution

Question 3

the temperature of the liquid falls

the temperature of the liquid rises

the temperature of the liquid remains unchanged

none of the above

Solution

Question 4

Inter particle spaces are maximum in the gaseous state of a substance

Particles which constitute gas follow a zig-zag path

Solid state is the most compact state of substance.

All are correct

Solution

Question 5

Melting and freezing point of a substance are the same.

Evaporation of liquid takes place only at its boiling point.

Pure water has no taste.

Water allows sunlight to pass through it.

Solution

Question 6

A substance is said to be in solid state if under normal pressure, its melting point is above the room temperature

A substance is said to be in liquid state if under normal pressure, its melting point is below the room temperature

A substance is said to be in gaseous state if under normal pressure, its melting point is below the room temperature

A substance can exist in solid, liquid and gaseous state under normal pressure and room temperature

Solution

Question 7

Surface area

Material of the saucer

Thermal conductivity

Colour

Solution

Question 8

ice is very cold

heat was used for changing ice at $$0^{\circ}C$$ to water at $$0^{\circ}C$$

the density of water is more than ice

the density of water is less than the ice

Solution

Question 9

Specific heat

Latent heat

Heat capacity

Heat of solution

Solution

Question 10

condensation

evaporation

precipitaion

None of these

Solution

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