Question : Select the false statement from the given options.
Option 1: Baikal rocks are formed from the dissolved materials that precipitate from the solution
Option 2: The sedimentary rocks are formed by the deposition and subsequent cementation of that material within bodies of water and at the surface of the earth
Option 3: Metamorphic rocks may be formed simply by being deep beneath the Earth’s surface, subjected to high temperatures and the great pressure of the rock layers above it
Option 4: Igneous rock is formed through the cooling and solidification of magma or lava
Correct Answer: Baikal rocks are formed from the dissolved materials that precipitate from the solution
Solution : The correct option is Baikal rocks are formed from the dissolved materials that precipitate from the solution.
The rocks around Lake Baikal in Siberia, Russia, are primarily of igneous origin. Lake Baikal is known for its unique geological and environmental features, but the formation of rocks in the region is not primarily related to the precipitation of dissolved materials from solutions.
Answer laterQuestion : The method of soil conservation in which rocks are piled up to slow down the flow of water which prevents gullies and further soil loss is called?
Option 1: Mulching
Option 2: Contour barriers
Option 3: Rock dam
Option 4: Terrace farming
Correct Answer: Rock dam
Solution : correct answer is Rock dams.
Rock dams are small barriers made up of stone, sand or gravel across a drainage. Its main purpose is to reduce erosion in a drainage channel by restricting the velocity of flow in the channel.
Question : The breaking up and decay of exposed rocks by temperature changes, frost action, plants, animals and human activity is called:
Option 1: Smelting
Option 2: Erosion
Option 3: Weathering
Option 4: Deforestation
Correct Answer: Weathering
Solution : The correct answer is Weathering
Weathering is the disintegration and deterioration of exposed rocks caused by variations in temperature, frost action, vegetation, animals, and human activities. One type of extractive metallurgy that produces a metal from its ore is smelting. Erosion is the process that wears down the earth's upper surface or nutrient layer.
Question : Marble comes under which category of rocks?
Option 1: Sedimentary
Option 2: Igneous
Option 3: Metamorphic
Option 4: None of these
Correct Answer: Metamorphic
Solution : The correct answer is Metamorphic.
Marble is a metamorphic rock that is formed when limestone is metamorphosed. Metamorphic rocks are often created by the change of igneous and sedimentary rocks under the earth's surface owing to the effects of heat and pressure.
Example of Metamorphic Rocks are- phyllite, schist, gneiss, quartzite and marble etc.
Question : Directions: Two statements are given followed by two conclusions numbered I and II. Assuming the statements to be true, even if they seem to be at variance with commonly known facts, decide which of the conclusions logically follow(s) from the statements.
Statements:
Some shells are pebbles.
All pebbles are rocks.
Conclusions:
I. No shell is a rock.
II. Some shells are rocks.
Option 1: Only conclusion I follows
Option 2: Neither conclusion I nor II follows
Option 3: Both conclusions I and II follow
Option 4: Only conclusion II follows
Correct Answer: Only conclusion II follows
Solution : The possible Venn diagram according to the given statements is as follows –
Let's analyze the conclusions –
Conclusion I: No shell is a rock – From the Venn diagram, it is evident that the circles representing shell and rock overlap and have some parts of their area in common. Thus, this conclusion does not follow.
Conclusion II: Some shells are rocks – From the Venn diagram, it is evident that the circles representing shells and rocks overlap and have some parts of their area in common. Thus, it can be concluded that some shells are rocks.
So, the only conclusion II follows. Hence, the fourth option is correct.
Question : Mushroom rocks are formed due to _____.
Option 1: glacial deposition
Option 2: deposition of sea waves
Option 3: running water erosion
Option 4: wind erosion
Correct Answer: wind erosion
Solution : The correct answer is wind erosion.
Mushroom rocks are formed from the erosion of the rocks. When the erosive power increases from the ground level, the resistant rocks take the shape of mushrooms with a gigantic top and a small neck. Mushroom rocks are found in the deserts. Mushroom rocks are natural formations resembling mushrooms found in places like Goblin Valley State Park, Utah, and Cappadocia, Turkey.
Question : _____ is the process by which rocks are broken down at the Earth's surface into sediments, clay, soils and substances that are dissolved in water.
Option 1: Loess
Option 2: Erosion
Option 3: Weathering
Option 4: Leaching
Correct Answer: Weathering
Solution : The correct answer is Weathering.
Weathering is the process by which rocks are broken down at the Earth's surface into sediments, clay, soils, and substances that dissolve in water. This natural phenomenon occurs due to various environmental factors, including temperature changes, water, wind and chemical reactions, leading to the gradual disintegration of rocks over time.
Question : The rapid sliding of large masses of bed rocks is called :
Option 1:
Option 2:
Option 3:
Option 4:
Correct Answer:
Solution : The correct answer is Landslide.
A landslide is a rapid and large flow of material down a slope, such as rock, earth, or debris. They might occur abruptly or gradually over long periods of time. When the force of gravity pulling the slope surpasses the power of the slope's resisting forces, the slope falls and a landslide occurs.
