30th June Static Quiz 2021
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30th June Static Quiz 2021 for UPSC Prelims
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- Question 1 of 5
1. Question
The Lithification is the process of formation of which type of the following rocks?
CorrectAns;- c) Sedimentary rock
Explanation;-
• The Lithification is the process in which sediments compact under pressure, expel connate fluids, and gradually become solid rock.
• Essentially, lithification is a process of porosity destruction through compaction and cementation.
• The Lithification, complex process whereby freshly deposited loose grains of sediment are converted into rock.
• The Lithification may occur at the time a sediment is deposited or later.
• The Cementation is one of the main processes involved, particularly for sandstones and conglomerates.
IncorrectAns;- c) Sedimentary rock
Explanation;-
• The Lithification is the process in which sediments compact under pressure, expel connate fluids, and gradually become solid rock.
• Essentially, lithification is a process of porosity destruction through compaction and cementation.
• The Lithification, complex process whereby freshly deposited loose grains of sediment are converted into rock.
• The Lithification may occur at the time a sediment is deposited or later.
• The Cementation is one of the main processes involved, particularly for sandstones and conglomerates.
- Question 2 of 5
2. Question
Which of the following is/are properties of quartz?
1.It consists of silica
2.Insoluble in water.
3.used in radio and radar
Choose correct statements from the following codesCorrectAns;- d) All of the above
Explanation:-
• It is one of the most important components of sand and granite, it consists of silica.
• It is a hard mineral virtually insoluble in water. It is white or colorless and used in radio and radar.
• It is one of the most important components of granite.IncorrectAns;- d) All of the above
Explanation:-
• It is one of the most important components of sand and granite, it consists of silica.
• It is a hard mineral virtually insoluble in water. It is white or colorless and used in radio and radar.
• It is one of the most important components of granite. - Question 3 of 5
3. Question
Which of these is a metamorphic rock?
CorrectAns; -c) Gneiss
Explanation;-
• The Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means “change in form”.
• The original rock is subjected to heat and pressure, causing profound physical or chemical change.
• The protolith may be a sedimentary, igneous, or existing metamorphic rock.
IncorrectAns; -c) Gneiss
Explanation;-
• The Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means “change in form”.
• The original rock is subjected to heat and pressure, causing profound physical or chemical change.
• The protolith may be a sedimentary, igneous, or existing metamorphic rock.
- Question 4 of 5
4. Question
Which of the following is/are correct about igneous rocks?
1.The Igneous rocks are classified based on texture.
2.The few examples of igneous rocks are Granite, quartzite and basalt.
3.The Igneous rocks are formed by Intermediate conditions of cooling of molten magma.
Choose correct statements from the following codesCorrectAns;- b) Only 1 and 3
Explanation:-
• 2nd statement is incorrect because quartzite is not igneous rock it is metamorphic.
• If molten material is cooled slowly at great depths, mineral grains may be very large.
• The Sudden cooling (at the surface) results in small and smooth grains.
• The Intermediate conditions of cooling would result in intermediate sizes of grains making up igneous rocks. Quartzite is metamorphic rock.IncorrectAns;- b) Only 1 and 3
Explanation:-
• 2nd statement is incorrect because quartzite is not igneous rock it is metamorphic.
• If molten material is cooled slowly at great depths, mineral grains may be very large.
• The Sudden cooling (at the surface) results in small and smooth grains.
• The Intermediate conditions of cooling would result in intermediate sizes of grains making up igneous rocks. Quartzite is metamorphic rock. - Question 5 of 5
5. Question
In order for a sedimentary rock (made of particles) to form, what must occur?
CorrectAns; -a) crystallization
Explanation;-
• The dissolved minerals in the ground water precipitate (crystallize) from water in the pore spaces forming mineral crusts on the sedimentary grains, gradually cementing the sediments, thus forming a rock.
• The Calcite (calcium carbonate), silica, and hematite (red iron oxide) are the most common cementing agents.
IncorrectAns; -a) crystallization
Explanation;-
• The dissolved minerals in the ground water precipitate (crystallize) from water in the pore spaces forming mineral crusts on the sedimentary grains, gradually cementing the sediments, thus forming a rock.
• The Calcite (calcium carbonate), silica, and hematite (red iron oxide) are the most common cementing agents.
