Sorting And Separation of Materials Test

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Sorting And Separation of Materials Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

Consider three groups (i, ii and iii) of various substances given below:

(i) Water, benzene, milk
(ii) Wood, steel, mirror
(iii) Pepper, turmeric, coriander

Which of the following options gives the correct match of the group and the property which is common to all the substances in that group?

A
(i) - Liquid state, (ii) - Opacity, (iii) - Spices

B
(i) - Transparency, (ii) - Smoothness, (iii) - Grains

C
(i) - Liquid state, (ii) - Hardness, (iii) - Pulses

D
(i) - Fluids, (ii) - Brittleness, (iii) - Spices

Solution

The substances in group (i) are all liquids.
All the materials in group (ii) are opaque.
Group (iii) represents a group of spices.
Question 2
1 / -0

Which of the following materials are lustrous?

(i) Steel knife
(ii) Gold jewellery
(iii) Iodine
(iv) Stone
(v) Silk cloth

A
(i), (ii), (iii) and (v)

B
(i) and (ii)

C
(i), (ii), (iii) and (iv)

D
(i) and (v)

Solution

Steel knife, gold jewellery, iodine and silk cloth all have their characteristic lustre.
Stones, however have a dull surface.
Question 3
1 / -0

Among the following groups of objects, select the one in which all the objects can be made from plastic, wood, metal as well as glass.

A
Pots for plants, spoons, storage containers

B
Decorative pieces, tables, storage containers

C
Suitcases, scissors, crockery

D
Poles, jewellery, cutlery

Solution

Decorative pieces, tables and storage containers can be made from all the mentioned materials, i.e. plastic, wood, metal and glass.
Question 4
1 / -0

Which of the following are pure substances?

(i) Elements
(ii) Compounds
(iii) Mixtures

A
(i) only

B
(ii) only

C
Both (ii) and (iii)

D
Both (i) and (ii)

Solution

Both elements and compounds are pure substances because all the constituent particles in the bulk are of the same kind.
Question 5
1 / -0

Which of the following is not a mixture?

A
Acetic acid

B
Milk

C
Petrol

D
Amalgam

Solution

Pure acetic acid is a compound, whereas milk, petrol and amalgam are mixtures.
Question 6
1 / -0

Identify the odd one among the following.

A
Plain window pane

B
Etched glass

C
Cellophane paper

D
Glass painting

Solution

A plain window pane is a transparent material, whereas all the other options are translucent.
Question 7
1 / -0

Which of the following statements is not correct about a compound?

A
A compound shows the properties of its constituent particles.

B
A compound cannot be separated into its constituents by simple physical processes.

C
The chemical composition of a compound is fixed.

D
A compound has fixed melting and boiling points.

Solution

The statement in option (1) is incorrect as a compound has unique properties, which are different from the properties of its constituent elements.
Question 8
1 / -0

A solution is prepared by dissolving 20 g of sugar in 80 g of water. What is the mass percentage of sugar in water?

A
20%

B
50%

C
40%

D
100%

Solution

Mass of solute = 20 g
Mass of solvent = 80 g
Mass of solution = 20 + 80 = 100 g
m/m percentage = 20%
Question 9
1 / -0

Which of the following is the term used for a homogeneous mixture of metals?

A
Alloy

B
Compound

C
Emulsion

D
Water

Solution

Alloys are homogeneous mixtures of two or more metals and may also include a non-metal.
They (alloys) display the properties of the constituent metals, which is a characteristic of mixtures.
All the compounds, including water, are pure substances.
Emulsions are heterogeneous mixtures of immiscible liquids.
Question 10
1 / -0

Consider the following substances:

(a) Air
(b) Water
(c) Hydrogen
(d) Milk

Which of the given substances exhibit properties such as variable composition and no sharp melting and boiling points?

A
Both (a) and (b)

B
Both (b) and (c)

C
Both (c) and (d)

D
Both (a) and (d)

Solution

Variable composition and no sharp melting and boiling points are the characteristics of mixtures.
Here, air and milk are mixtures, whereas water is a compound and hydrogen is an element.
Hence, option (4) is correct.
Question 11
1 / -0

Classify the following objects into different groups and choose the correct option among those given below:

1. Pencil
2. Wooden table
3. Notebook
4. Bucket
5. Polythene bag
6. Plastic chair
7. Bullock cart

A

1, 2, 3, 7 - Group I

4, 5, 6 - Group II

B

1, 3, 4, 6 - Group I

2, 5, 7 - Group II

C

2, 3, 6 - Group I

1, 4, 5, 7 - Group II

D

3, 4, 5 - Group I

1, 2, 6, 7 - Group II

Solution

Pencil, wooden table, notebook and bullock cart are classified together in group I as they are made up of wood/paper and are biodegradable; whereas bucket, polythene bag and chair are plastic products and are non-biodegradable, so they are classified together in group II.

Question 12

1 / -0

Classify the following materials on the basis of their appearance and choose the correct option.

1. Cardboard	5. Wood
2. Copper wire	6. Iron nail
3. Aluminium sheet	7. Steel rod
4. Chalk	8. Silver coin

1, 4, 5 - Group I

2, 3, 6, 7, 8 - Group II

1, 2, 5, 8 - Group I

3, 4, 6, 7 - Group II

2, 3, 4, 5 - Group I

1, 6, 7, 8 - Group II

3, 6, 7, 8 - Group I

1, 2, 4, 5 - Group II

Solution

Cardboard, chalk and wood are classified together in group I as they are not metallic materials.
However, copper wire, aluminium sheet, iron nail, steel rod and silver coin are classified together in group II as they are metallic objects.

Question 13
1 / -0

Four students are provided with four different substances as listed below:

Student A - Chalk powder
Student B - Salt
Student C - Sand
Student D - Sugar

When these substances are added to water, which of the students will obtain a solution?

A
Students A and D

B
Students B and D

C
Students C and D

D
Students A and C

Solution

Salt and sugar are water soluble substances as they completely dissolve in water to form true solutions. However, sand and chalk powder are insoluble in water and form a suspension when mixed with water and settle down if left undisturbed.
Question 14
1 / -0

Which of the following statements is/are incorrect?

a. Iodine crystals have lustre.
b. All metals have a silvery white lustre.
c. Wood is a non-lustrous material.

A
Only b

B
Only a

C
Both a and c

D
Both a and b

Solution

Statement 'b' is not correct as all metals do have a lusture, but it may not always be silvery white.
For example, gold has a yellow lusture and copper has a reddish brown lusture.
Iodine crystals have lusture and wood is a non-lustrous material. Hence, statements 'a' and 'c' are correct.
Question 15
1 / -0

Rohan's class teacher explained the difference between pure substances and mixtures, and gave some examples from daily life. Choose the option which is a pure substance among the following.

A

B

C

D

Solution

A pure substance is made up of only one type of component particles. All elements and compounds are made up of the same kind of molecules or atoms and are pure substances. Gold being an element is a pure substance.
Question 16
1 / -0

Shreya is provided with the following objects and asked to put them in a bucket containing water.

Wooden toy, iron nail, stone, plant leaf, and plastic ball

Which among the given objects will float and which will sink in water?

A
Wooden toy and iron nail will float, whereas stone, plant leaf and plastic ball will sink.

B
Wooden toy, plant leaf and plastic ball will float, whereas iron nail and stone will sink.

C
Iron nail and plastic ball will float, whereas wooden toy and stone will sink.

D
Plant leaf will float, whereas wooden toy, iron nail and plastic ball will sink.

Solution

Objects like wooden toy, plant leaf and plastic ball being less dense will float in water, whereas iron nail and stone will sink as they have a greater density than water.
Question 17
1 / -0

Select the hardest object among the following.

A
Football

B
Tennis ball

C
Cricket ball

D
Basketball

Solution

A cricket ball is harder than the balls used in football, tennis and basketball, as it has the highest density.
Question 18
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Which object among the following is different from the others?

A
Steel pipe

B
Pencil

C
Wooden stick

D
Glass rod

Solution

All the given objects, although made of different materials, are similar in their shape. However, a steel pipe is different as it is hollow, while the other objects are solid.
Question 19
1 / -0

Identify the one which is an element among the following substances.

A
Mercury

B
Sugar

C
Table salt

D
Water

Solution

Mercury is a metallic element, whereas sugar, table salt and water are examples of compounds.
Question 20
1 / -0

Salt can be separated from its solution (salt dissolved in water) because

A
mixing of salt in water is a change that can be reversed by cooling the solution

B
mixing of salt in water is a change that cannot be reversed

C
mixing of salt in water is a permanent change

D
mixing of salt in water is a change that can be reversed by evaporation

Solution

Mixing of salt in water is a reversible change because the components of the mixture can be separated by evaporation. Water vaporises and salt is left behind.
Thus, dissolution of salt in water is a reversible change.

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Sorting And Separation of Materials Test - 4

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Sorting And Separation of Materials Test - 4

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Question 1

(i) - Liquid state, (ii) - Opacity, (iii) - Spices

(i) - Transparency, (ii) - Smoothness, (iii) - Grains

(i) - Liquid state, (ii) - Hardness, (iii) - Pulses

(i) - Fluids, (ii) - Brittleness, (iii) - Spices

Solution

Question 2

(i), (ii), (iii) and (v)

(i) and (ii)

(i), (ii), (iii) and (iv)

(i) and (v)

Solution

Question 3

Pots for plants, spoons, storage containers

Decorative pieces, tables, storage containers

Suitcases, scissors, crockery

Poles, jewellery, cutlery

Solution

Question 4

(i) only

(ii) only

Both (ii) and (iii)

Both (i) and (ii)

Solution

Question 5

Acetic acid

Milk

Petrol

Amalgam

Solution

Question 6

Plain window pane

Etched glass

Cellophane paper

Glass painting

Solution

Question 7

A compound shows the properties of its constituent particles.

A compound cannot be separated into its constituents by simple physical processes.

The chemical composition of a compound is fixed.

A compound has fixed melting and boiling points.

Solution

Question 8

20%

50%

40%

100%

Solution

Question 9

Alloy

Compound

Emulsion

Water

Solution

Question 10

Both (a) and (b)

Both (b) and (c)

Both (c) and (d)

Both (a) and (d)

Solution

Question 11

1, 2, 3, 7 - Group I 4, 5, 6 - Group II

1, 3, 4, 6 - Group I 2, 5, 7 - Group II

2, 3, 6 - Group I 1, 4, 5, 7 - Group II

3, 4, 5 - Group I 1, 2, 6, 7 - Group II

Solution

Question 12

1, 4, 5 - Group I 2, 3, 6, 7, 8 - Group II

1, 2, 5, 8 - Group I 3, 4, 6, 7 - Group II

2, 3, 4, 5 - Group I 1, 6, 7, 8 - Group II

3, 6, 7, 8 - Group I 1, 2, 4, 5 - Group II

Solution

1, 2, 3, 7 - Group I

4, 5, 6 - Group II

1, 3, 4, 6 - Group I

2, 5, 7 - Group II

2, 3, 6 - Group I

1, 4, 5, 7 - Group II

3, 4, 5 - Group I

1, 2, 6, 7 - Group II

1, 4, 5 - Group I

2, 3, 6, 7, 8 - Group II

1, 2, 5, 8 - Group I

3, 4, 6, 7 - Group II

2, 3, 4, 5 - Group I

1, 6, 7, 8 - Group II

3, 6, 7, 8 - Group I

1, 2, 4, 5 - Group II