chemistry : class12 Gravity Separation : Concentration of ores : General Principles and Processes of Isolation of Elements MCQ Questions and Answers
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Gravity Separation
MCQ questions and answers.
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MCQ Questions
1. What is the main principle of gravity separation in ore concentration?
A.
Difference in density between the ore and gangue
B.
Difference in magnetic properties
C.
Difference in boiling points
D.
Difference in electrical conductivity
Correct Answer:
Difference in density between the ore and gangue
Explanation:
Gravity separation concentrates an ore by using the difference in densities of the heavier ore particles and the lighter gangue particles.
2. Which method is commonly used for the gravity separation of ores?
A.
Hydraulic washing
B.
Electrolysis
C.
Roasting
D.
Leaching
Correct Answer:
Hydraulic washing
Explanation:
Hydraulic washing is a gravity separation method in which water carries away lighter gangue while heavier ore particles settle.
3. In hydraulic washing, which particles generally settle down first?
A.
Heavier ore particles
B.
Lighter gangue particles
C.
Dissolved impurities
D.
Water molecules
Correct Answer:
Heavier ore particles
Explanation:
The denser ore particles settle more quickly under gravity, whereas the lighter gangue particles are washed away by the flowing water.
4. What is the role of water in hydraulic washing?
A.
It carries away lighter gangue particles
B.
It melts the ore particles
C.
It changes the ore into a gas
D.
It magnetizes the gangue
Correct Answer:
It carries away lighter gangue particles
Explanation:
In hydraulic washing, flowing water separates the lighter gangue from the heavier ore particles.
5. Gravity separation is most suitable when the ore and gangue have a difference in their:
A.
Densities
B.
Colours only
C.
Boiling points
D.
Melting points only
Correct Answer:
Densities
Explanation:
Gravity separation depends mainly on the difference in density between the valuable mineral and the unwanted gangue.
6. Which part of an ore is usually removed during hydraulic washing?
A.
Lighter gangue
B.
Heavier valuable mineral
C.
Metallic ions in solution
D.
Magnetic particles only
Correct Answer:
Lighter gangue
Explanation:
The flowing water removes the less dense gangue, while the denser valuable mineral remains behind.
7. Which device can be used for concentrating an ore by gravity separation?
A.
Wilfley table
B.
Electrolytic cell
C.
Blast furnace
D.
Magnetic coil
Correct Answer:
Wilfley table
Explanation:
A Wilfley table is a gravity separation device that uses water and shaking motion to separate heavier ore particles from lighter gangue.
8. During gravity separation, the valuable ore mineral is generally:
A.
Denser than the gangue
B.
Lighter than the gangue
C.
A gas mixed with the gangue
D.
Completely dissolved in water
Correct Answer:
Denser than the gangue
Explanation:
The valuable mineral is generally denser, so it settles while the lighter gangue is carried away by water.
9. What happens to the ore particles in a gravity separation process when water flows over them?
A.
Heavier particles settle and lighter particles are carried away
B.
All particles dissolve equally
C.
Lighter particles settle first
D.
All particles become magnetic
Correct Answer:
Heavier particles settle and lighter particles are carried away
Explanation:
The separation occurs because gravity causes denser ore particles to settle, while flowing water carries away less dense gangue.
10. Which type of ore is particularly suitable for gravity separation?
A.
An ore with dense mineral and light gangue
B.
An ore with mineral and gangue of identical density
C.
An ore containing only dissolved ions
D.
An ore separated only by magnetic attraction
Correct Answer:
An ore with dense mineral and light gangue
Explanation:
Gravity separation works effectively when there is a clear density difference between the valuable mineral and the gangue.
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