Matter in Our Surrounding Test

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Matter in Our Surrounding Test - 30

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Weekly Quiz Competition

Question 1
1 / -0

Different states of same substance are due to the difference in ________.

A
temperature

B
pressure

C
Both A and B

D
none of the above

Solution

Different states of the same substance are due to the difference in either temperature or pressure or both. For example, if we heat ice, it melts to form liquid water.
Question 2
1 / -0

Latent heat is evolved during the transformation of liquids into solids.
How will you explain this statements?

A
Heat is released and temperature decreases

B
Heat is absorbed and temperature increases

C
Heat does not get absorbed nor released

D
None of the above

Solution

When we take the latent heat, it is expressed as the amount of heat per mole in terms of units or calories.
Or latent heat is the unit mass of the substance which undergoes for a change in state. undergoing a change of state.

When the latent heat gets evolved during the transformation of liquids into solids, heat energy will get released and the temperature level decreases.
Question 3
1 / -0

Which of the following decreases the rate of evaporation?

A
Increase in surface area

B
Increase in temperature

C
Increase in humidity

D
Increase in wind speed

Solution

When temperature and wind speed are constant but humidity increases, the rate of evaporation will decrease. When wind speed and humidity stay constant and temperature increases, then the rate of evaporation will increase because warmer air can hold more water vapor than colder air.
Hence $$\text{C}$$ is correct answer
Question 4
1 / -0

Which one of the following statement is correct ?

A
Both boiling and evaporation are surface phenomena.

B
Boiling is a surface phenomenon, but evaporation is a bulk phenomenon

C
Both boiling and evaporation are bulk phenomena.

D
Boiling is a bulk phenomenon, but evaporation is a surface phenomenon

Solution

When we boil a liquid for example water or milk heating is to be done from bottom of a vessel to bring temperature of entire liquid to its boiling point. So it is a bulk process. Normally during evaporation a liquid evaporates from top surface without heating. For example evaporation of water from lake or a vessel. This is a surface phenomenon.
Hence, the correct option is D.
Question 5
1 / -0

Addition of solute to a given solvent in a closed container

A
decrease the rate of condensation.

B
decrease the rate of evaporation.

C
increase the rate of evaporation.

D
decrease both the rate of evaporation and condensation.

Solution

Adding solute to a given solvent in a closed container decreases the rate of evaporation.
When we add a solute to the solvent, some of the solute molecules will take the surface of the liquid. As only solvent molecules located at the surface can evaporate, the sheer presence of the solute lowers the number of solvent molecules and therefore lowers the equilibrium vapor pressure.
So, option B is correct.
Question 6
1 / -0

Matter is ______ in nature.

A
Paticulate

B
electrial

C
both a and b

D
none

Solution

Matter is particulate in nature.
Hence, Option $$A$$ is correct
Question 7
1 / -0

During change of state of matter, the temperature remains the same due to:

A
loss of heat

B
less supply of heat

C
latent heat

D
lattice energy

Solution

The heat supplied is used up for breaking the bonds between the molecules of the substance instead of increasing temperature, thus enabling a change in state. This heat is called latent heat.

Latent heat is the heat that is required to convert a solid into a liquid/vapor, or a liquid into a vapor, without causing a change in temperature.

So, the correct option is 'C'.
Question 8
1 / -0

A fully inflated balloon goes higher in the atmosphere, so what will be the pressure outside and inside the balloon respectively.

A
Increases, Decreases

B
Decreases, Increases

C
Decreases, Remains constant

D
Increases, Remains constant

Solution

When balloon goes higher in the atmosphere, there will be fewer air molecules outside. So atmospheric pressure $$decreases$$.

As there is no change volume inside the balloon, since it is fully inflated, the pressure inside the balloon $$remains\ constant$$.
Question 9
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Which one of the following statement is correct in respect of fluids?

A
Only gases behave as fluids

B
Gases and solids behave as fluids

C
Gases and liquid behave as fluids

D
Only liquids behave as fluids

Solution

Both gases and liquids are fluids as they tend to flow due to less force of attraction between their particles
Question 10
1 / -0

Evaporation of a liquid takes place at:

A
any temperature lower than its boiling point.

B
a fixed temperature higher than its boiling point.

C
a fixed temperature and pressure.

D
all temperatures.

Solution

Evaporation is a phenomenon in which a liquid is converted into a vapour state at any temperature below its boiling point.

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Re-Attempt Weekly Quiz Competition

Matter in Our Surrounding Test - 30

Result

Matter in Our Surrounding Test - 30

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SHARING IS CARING

Question 1

temperature

pressure

Both A and B

none of the above

Solution

Question 2

Heat is released and temperature decreases

Heat is absorbed and temperature increases

Heat does not get absorbed nor released

None of the above

Solution

Question 3

Increase in surface area

Increase in temperature

Increase in humidity

Increase in wind speed

Solution

Question 4

Both boiling and evaporation are surface phenomena.

Boiling is a surface phenomenon, but evaporation is a bulk phenomenon

Both boiling and evaporation are bulk phenomena.

Boiling is a bulk phenomenon, but evaporation is a surface phenomenon

Solution

Question 5

decrease the rate of condensation.

decrease the rate of evaporation.

increase the rate of evaporation.

decrease both the rate of evaporation and condensation.

Solution

Question 6

Paticulate

electrial

both a and b

none

Solution

Question 7

loss of heat

less supply of heat

latent heat

lattice energy

Solution

Question 8

Increases, Decreases

Decreases, Increases

Decreases, Remains constant

Increases, Remains constant

Solution

Question 9

Only gases behave as fluids

Gases and solids behave as fluids

Gases and liquid behave as fluids

Only liquids behave as fluids

Solution

Question 10

any temperature lower than its boiling point.

a fixed temperature higher than its boiling point.

a fixed temperature and pressure.

all temperatures.

Solution

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