Sorting And Separation of Materials Test

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Sorting And Separation of Materials Test - 2

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Weekly Quiz Competition

Question 1
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 2
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 3
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 4
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 5
1 / -0

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 6
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 7
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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Re-Attempt Weekly Quiz Competition

Sorting And Separation of Materials Test - 2

Result

Sorting And Separation of Materials Test - 2

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SHARING IS CARING

Question 1

Students A and D

Students B and D

Students C and D

Students A and C

Solution

Question 2

Only b

Only a

Both a and c

Both a and b

Solution

Question 3

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

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

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

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

Solution

Question 4

Football

Tennis ball

Cricket ball

Basketball

Solution

Question 5

Steel pipe

Pencil

Wooden stick

Glass rod

Solution

Question 6

Mercury

Sugar

Table salt

Water

Solution

Question 7

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

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

mixing of salt in water is a permanent change

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

Solution

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