Static Quiz 25 November 2024
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Static Quiz 25 November 2024 for UPSC Prelims
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- Question 1 of 5
1. Question
Metamorphic rocks are formed due to
(1) Cementation of sedimentary rocks
(2) Close proximity of sedimentary rocks with molten magma
(3) Cooling and solidification of lavaSelect the correct answer using the codes below.
CorrectSolution: C
Justification: Metamorphic rocks are made by either heating up or squashing the earth’s crust. They are often found in mountainous regions. One example is slate. Slate was originally a black mud laid down on the bottom of the sea or lake. Fossils can sometimes be found in it but they are often squashed. Other common metamorphic rocks are called marble, gneiss, schist. Earth movements can cause rocks to be deeply buried or squeezed. As a result, the rocks are heated and put under great pressure. They do not melt, but the minerals they contain are changed chemically, forming metamorphic rocks. Sometimes, metamorphic rocks are formed when rocks are close to some molten magma, and so get heated up. When a metamorphic rock is formed under pressure, its crystals become arranged in layers.IncorrectSolution: C
Justification: Metamorphic rocks are made by either heating up or squashing the earth’s crust. They are often found in mountainous regions. One example is slate. Slate was originally a black mud laid down on the bottom of the sea or lake. Fossils can sometimes be found in it but they are often squashed. Other common metamorphic rocks are called marble, gneiss, schist. Earth movements can cause rocks to be deeply buried or squeezed. As a result, the rocks are heated and put under great pressure. They do not melt, but the minerals they contain are changed chemically, forming metamorphic rocks. Sometimes, metamorphic rocks are formed when rocks are close to some molten magma, and so get heated up. When a metamorphic rock is formed under pressure, its crystals become arranged in layers. - Question 2 of 5
2. Question
Which of the following statements are correct about the earth’s atmosphere?
1. The atmosphere layer closest to the earth is referred to as the troposphere.
2. Our planet earth is enveloped by a deep blanket of gases extending several thousands of kilometres above its surface.
3. In the absence of the atmosphere extremes of temperature would exist between day and night over the earth’s surface.CorrectAns;- d) All of the above
IncorrectAns;- d) All of the above
- Question 3 of 5
3. Question
Consider the following:
(1) Metamorphism
(2) Convergent plate boundaries
(3) Volcanic activityWhich of the following rocks is often associated with the above?
CorrectSolution:A
Justification: Gneiss usually forms by regional metamorphism at convergent plate boundaries. It is a highgrade metamorphic rock in which mineral grains recrystallized under intense heat and pressure associated with mountain building and volcanic activity. This alteration increases the size of the mineral grains and segregated them into bands, a transformation which made the rock and its minerals more stable in their metamorphic environment. Gneiss can form in several different ways. The most common path begins with shale, which is a sedimentary rock. Regional metamorphism can transform shale into slate, then phyllite, then schist, and finally into gneiss.IncorrectSolution:A
Justification: Gneiss usually forms by regional metamorphism at convergent plate boundaries. It is a highgrade metamorphic rock in which mineral grains recrystallized under intense heat and pressure associated with mountain building and volcanic activity. This alteration increases the size of the mineral grains and segregated them into bands, a transformation which made the rock and its minerals more stable in their metamorphic environment. Gneiss can form in several different ways. The most common path begins with shale, which is a sedimentary rock. Regional metamorphism can transform shale into slate, then phyllite, then schist, and finally into gneiss. - Question 4 of 5
4. Question
Which of the following factors aid the weathering of rocks?
(1) Intense heating during the day and rapid cooling at night
(2) Pore pressure of water seeping into rocks
(3) Thawing of rocks
Select the correct answer using the codes below.CorrectSolution: D
Justification: Block and Granular Disintegration type of weathering is carried out in deserts by rapid changes of temperature, or in mountains through frost action. Desert regions experience a large diurnal range of temperature due to direct heating by the sun during the day and rapid radiation at night. The rocks successively expand and contract. The repeated expansion and contraction of the rocks tends to enlarge joints and large rock masses ultimately break into angular blocks. This process is called block disintegration. Rocks having vertical joints are more susceptible to this form of weathering. The rocks having curvilinear joints get weathered. If water seeps in the cracks of the rocks, it exerts further pressure from inwards resulting in cracking of the rock.IncorrectSolution: D
Justification: Block and Granular Disintegration type of weathering is carried out in deserts by rapid changes of temperature, or in mountains through frost action. Desert regions experience a large diurnal range of temperature due to direct heating by the sun during the day and rapid radiation at night. The rocks successively expand and contract. The repeated expansion and contraction of the rocks tends to enlarge joints and large rock masses ultimately break into angular blocks. This process is called block disintegration. Rocks having vertical joints are more susceptible to this form of weathering. The rocks having curvilinear joints get weathered. If water seeps in the cracks of the rocks, it exerts further pressure from inwards resulting in cracking of the rock. - Question 5 of 5
5. Question
Which of the following statements about Composition of Atmosphere are correct?
1. The earth atmosphere it contains huge numbers of solid and liquid particles, collectively called ‘aerosols’.
2. The proportion of gases changes in the higher layers of the atmosphere in such a way that oxygen will be almost in negligible quantity
3. Some of the gases may be regarded as permanent atmospheric components which remain in fixed proportion to the total gas volume.CorrectAns;- d) All of the above
IncorrectAns;- d) All of the above
