Matter in Our Surrounding Test

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Matter in Our Surrounding Test - 12

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Weekly Quiz Competition

Question 1
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Identify the incorrect statement about evaporation

(A) It causes cooling
(B) It increase with increase in humidity
(C) It decreases with increase in temperature
(D) It increases with increase in wind speed

A
(B) and (C) are incorrect

B
(A) and (B) are correct

C
All of these

D
(A), (B) and (C) are correct

Solution

The rate of evaporation increases with increase in temperature, surface area & wind speed but decrease by the increase in humidity.
Question 2
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Which of the following is correct about latent heat?

(A) It does not increase the temperature.
(B) It does not change the state of the substance.
(C) It increases the kinetic energy of the molecules.
(D) Ice is more effective in cooling than water at same temperature due to latent heat.

A
(B) and (C) are correct

B
(A), (B), (C) and (D) are correct

C
(A) and (D) are correct

D
(A), (C) and (D) are correct

Solution

(A) Latent heat does not raise the temperature.
(B) But the latent heat has always to be supplied to change the state of a substance.
(C) The latent heat does not increase the kinetic energy of the particles of the substance. And since there is no increase in the kinetic energy of the particles, the temperature of a substance does not rise during the change of state.
(D) Ice is in solid state while water is in liquid state. Thus, ice will convert into liquid state by absorbing the latent heat of fusion. On the other hand, no such heat will be absorbed by water as it is already in the liquid state. Hence, ice will absorb more energy than water at 273K or 0 ° C. The more is the energy absorbed, the more is the cooling effect. As a result, the cooling effect of ice at 273 K or 0° C is more than water at the same temperature.
Question 3
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Water kept in an earthen pot becomes cool in summer, because:

(A) Molecules of water escape through pores and cause cooling.
(B) Earthen pots are made up of clay.
(C) It decreases the temperature of water.
(D) In summer, the rate of evaporation of water is faster.

A
(A), (B) and (C) are correct

B
(B) and (C) are correct

C
(A), (B), (C) and (D) are correct

D
(A) and (B) are correct.

Solution

Water kept in an earthen pot (matka) becomes cool in summer Because
(1) Pot surface made of earthen clay has a large number of extremely small pores in its walls. Some water continuously seeps through the porous walls to the outside of the earthen pot.
(2) During evaporation, water absorbs the latent heat required for vaporisation from the surface of earthen pot, the remaining water and the surrounding air.
(3) Heat energy equal to the latent heat of vaporisation is absorbed from the earthen pot leaving the water cooler than before means temperature decreases.
(4) Evaporation is a surface phenomenon, and it causes cooling effect.
Question 4
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The two major gases present in air are

A
Hydrogen and Oxygen

B
Nitrogen and oxygen

C
Nitrogen and Carbon dioxide.

D
Nitrogen and Hydrogen

Solution

Air is a mixture of gases. Two main constituents of air is Nitrogen (78%) and Oxygen (21%). Other gases include carbon dioxide, helium, water vapour etc.
Question 5
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Three pieces of cloth were soaked in water, alcohol and ether separately and kept on a table. What is the decreasing order of drying of the cloths?

A
Ether > Alcohol > Water

B
Water < Alcohol < Ether

C
Water > Alcohol < Ether

D
Alcohol > Water > Ether

Solution

The decreasing order of the rate of drying is Water < Alcohol < Ether. The cloth soaked in water will take longer time in drying as water is less volatile compared to alcohol and ether. A cloth soaked in alcohol is will take less time than that soaked in water. The cloth soaked in ether will dry quickly as ether is a highly volatile liquid. The particles of ether gain energy from the cloth and/or surroundings and evaporate quickly.
Question 6
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Sulphur dioxide is collected in the lab in a gas jar by upward displacement of air. Which of the following statement is correct regarding the density of the gas?

A
It is lighter than air.

B
It is heavier than air.

C
No correct statement can be made about the density of the gas.

D
Its density is equal to that of air.

Solution

Gases are collected in different ways, depending upon their density and solubility in water. Sulphur dioxide gas is collected in the lab in a gas jar by upward displacement of the air because sulphur dioxide (SO₂) gas is heavier (more dense) than air. Its relative density is 1.43. Sulphur dioxide gas produced in a chemical reaction is passed through a delivery tube into a gas jar, where it sinks and pushes the air out of the top.
Question 7
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Which of the two statements is true?

Statement A: The temperature of the liquid becomes constant once it starts boiling.
Statement B: Pressure of air at sea level is 70 cm.

A
Statement B

B
Statement A

C
Neither A or B

D
Both A and B

Solution

Statement A is correct. The temperature of the liquid becomes constant once it starts boiling. The heat is used to change the state of matter.

The pressure of air at the sea level is 760 mm (76 cm) of Hg (mercury).
Question 8
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Which of the following is needed by surgeons during surgery?

A
Ether

B
Acid

C
Ethane

D
Propanol

Solution

Ether is used by surgeons during surgery. Ether is highly volatile and antiseptic in nature. It is used to make a wound sterile. It was one of the first anesthetics used in surgery.

Question 9

1 / -0

Match the following with the correct response:-

(1) Physical state of water at 300 K	(A) Solid
(2) Water at 273 K	(B) Latent heat
(3) Water at 373 K	(C) Vapour
(4) Energy required to change the state	(D) Liquid

1-D, 2-A, 3-C, 4-B

1-C, 2-B, 3-D, 4-A

1-A, 2-C, 3-B, 4-D

1-B, 2-D, 3-A, 4-C

Solution

(1) Physical state of water at 300 K (27^oC) is liquid.
(2) At 273 K (0^oC) which is the melting point of water, water is in solid state.
(3) At 373 K (100^oC) which is the boiling point of water, water is in vapour state.
(4) Energy required to change the state of matter is known as latent (hidden) heat.

Question 10
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Which of the following is not a chemical change?

(A) Changing of milk into curd
(B) Freezing of water
(C) Burning of paper
(D) Mixing of iron filling & sand

A
(A), (B) and (C) are correct

B
(B) and (D) are correct

C
(A) and (B) are correct

D
All of these

Solution

Because in both the cases no new substance with new chemical properties is formed.

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Matter in Our Surrounding Test - 12

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Matter in Our Surrounding Test - 12

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Question 1

(B) and (C) are incorrect

(A) and (B) are correct

All of these

(A), (B) and (C) are correct

Solution

Question 2

(B) and (C) are correct

(A), (B), (C) and (D) are correct

(A) and (D) are correct

(A), (C) and (D) are correct

Solution

Question 3

(A), (B) and (C) are correct

(B) and (C) are correct

(A), (B), (C) and (D) are correct

(A) and (B) are correct.

Solution

Question 4

Hydrogen and Oxygen

Nitrogen and oxygen

Nitrogen and Carbon dioxide.

Nitrogen and Hydrogen

Solution

Question 5

Ether > Alcohol > Water

Water < Alcohol < Ether

Water > Alcohol < Ether

Alcohol > Water > Ether

Solution

Question 6

It is lighter than air.

It is heavier than air.

No correct statement can be made about the density of the gas.

Its density is equal to that of air.

Solution

Question 7

Statement B

Statement A

Neither A or B

Both A and B

Solution

Question 8

Ether

Acid

Ethane

Propanol

Solution

Question 9

1-D, 2-A, 3-C, 4-B

1-C, 2-B, 3-D, 4-A

1-A, 2-C, 3-B, 4-D

1-B, 2-D, 3-A, 4-C

Solution

Question 10

(A), (B) and (C) are correct

(B) and (D) are correct

(A) and (B) are correct

All of these

Solution

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