Karnataka PSI test series 2018 is the one of the popular initiative of StudyVillae. In this section we provide the key answers and explanations for each of the questions in the tests. Aspirants should check their answers with the keys provided and should revise accordingly.
In this post we are providing the key answers and explanations for the test PSI-106.
PSI-106 Key Answers
Q.1) which is the uppermost layer of the earth?
- Mantle
- Core
- Crust
- Continent
Q 1) solution (3)
Interior of the earth is Just like an onion; the earth is made up of several concentric layers with one inside another. The uppermost layer over the earth’s surface is called the crust. It is the thinnest of all the layers. It is about 35 km. on the continental masses and only 5 km. on the ocean floors.
Q.2) The domain of the earth consisting of solid rocks is?
- Atmosphere
- Hydrosphere
- Lithosphere
- Biosphere
Q 2) solution (3)
Lithosphere is the solid crust or the hard-top layer of the earth. It is made up of rocks and minerals and covered by a thin layer of soil. It is an irregular surface with various landforms such as mountains, plateaus, plains, valleys, etc. Landforms are found over the continents
and also, on the ocean floors. Lithosphere is the domain that provides us forests, grasslands for grazing, land for agriculture and human settlements. It is also a source of mineral wealth.
Q.3) The domain of the earth consisting of water is?
- Atmosphere
- Hydrosphere
- Lithosphere
- Biosphere
Q 3) solution (2)
The domain of water is referred to as hydrosphere. It comprises various sources of water and different types of water bodies like rivers, lakes, seas, oceans, etc. It is essential for all living organisms.
Q.4) The domain of the earth consisting of living organisms is?
- Atmosphere
- Hydrosphere
- Lithosphere
- Biosphere
Q 4) solution (4)
Plant and animal kingdom together make biosphere or the living world. It is a narrow zone of the earth where land, water and air interact with each other to support life. It is the narrow zone of contact between the land, water and air. It is in this zone that life exists. All living organisms including humans are linked to each other and to the biosphere for survival. The organisms in the biosphere are broadly divided into the plant kingdom and the animal kingdom.
Q.5) Point on the Earth’s surface directly above an earthquake’s starting point?
- Focus
- Seismic wave
- Epicentre
- Tectonic Plate
Q 5) solution (3)
When the Lithosphere plates move, the surface of the earth vibrates. The vibrations can travel all-round the earth. These vibrations are called earthquakes. The place in the crust where the movement starts is called the focus. The place on the surface above the focus is called the epicenter. Vibrations travel outwards from the epicenter as waves.
Greatest damage is usually closest to the epicenter and the strength of the earthquake decreases away from the center.
Q.6) Point along a fault at which the first motion of an earthquake occurs?
- Focus
- Seismic wave
- Epicenter
- Tectonic Plate
Q.6) solution (1)
When the Lithosphere plates move, the surface of the earth vibrates. The vibrations can travel all-round the earth. These vibrations are called earthquakes. The place in the crust where the movement starts is called the focus. The place on the surface above the focus is called the epicenter. Vibrations travel outwards from the epicenter as waves. Greatest damage is usually closest to the epicenter and the strength of the earthquake decreases away from the center.
Q.7) What is the Scale used to measure earthquake strength?
- The ground motion method
- The Mercalli Scale
- S-P time method
- The Richter method
Q 7) solution (4)
Earthquakes are measured with the Richter Magnitude Scale developed by Charles F. Richter of California Institute of Technology in 1935.
Q.8) Mushroom rocks are found in?
- Desert
- River valley
- Glaciers
- Plain
Q 8) solution (1)
An active agent of erosion and deposition in the deserts is wind. In deserts you can see rocks in the shape of a mushroom, commonly called mushroom rocks. Winds erode the lower section of the rock more than the upper part. Therefore, such rocks have narrower base and wider top. When the wind blows, it lifts and transports sand from one place to another. When it stops blowing the sand falls and gets deposited in low hill – like structures. These are called sand dunes.
Q.9) Which is not an erosional feature of sea waves?
- Cliff
- Beach
- Sea cave
- Sea arch
Q 9) solution (2)
The erosion and deposition of the sea waves gives rise to coastal land forms. Sea waves continuously strike at the rocks. Cracks develop. Over time they become larger and wider. Thus, hollow like caves are formed on the rocks. They are called sea caves.
As these cavities become bigger and bigger only the roof of the caves remains, thus forming sea arches. Further, erosion breaks the roof and only walls are left. These wall like features are called stacks. The steep rocky coast rising almost vertically above sea water is called sea cliff. The sea waves deposit sediments along the shores forming beaches.
Q.10) How much percent of carbon dioxide is present in atmosphere?
- 0.05%
- 0.09%
- 0.04%
- 0.07%
Q 10) solution (3)
By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1% at sea level, and 0.4% over the entire atmosphere.
Q.11) Which layer of the atmosphere contains the ozone layer?
- Stratosphere
- Exosphere
- Troposphere
- Mesosphere
Q.11) solution (1)
Above the troposphere lies the stratosphere. It extends up to a height of 50 km. This layer is almost free from clouds and associated weather phenomenon, making conditions most ideal for flying aeroplanes. One important feature of stratosphere is that it contains a layer of ozone gas. We have just learnt how it protects us from the harmful effect of the sun rays.
Q.12) We live in which layer of the atmosphere. This is also where weather occurs.?
- Stratosphere
- Exosphere
- Troposphere
- Mesosphere
Q 12) solution (3)
Troposphere layer is the most important layer of the atmosphere. Its average height is 13 km. The air we breathe exists here. Almost all the weather phenomena like rainfall, fog and hailstorm occur in this layer.
Q.13) Which layer of the atmosphere contains the radio transmission?
- Thermosphere
- Exosphere
- Troposphere
- Mesosphere
Q.13) solution (1)
In thermosphere temperature rises very rapidly with increasing height. Ionosphere is a part of this layer. It extends between 80-400 km. This layer helps in radio transmission. In fact, radio waves transmitted from the earth are reflected to the earth by this layer.
Q.14) How much of Earth’s water is drinkable?
- 3%
- 2%
- 2.7%
- 2.5%
Q.14) solution (3)
Out of all the water on Earth, saline water in oceans, seas and saline groundwater make up about 97% of it. Only 2.5–2.75% is fresh water, including 1.75–2% frozen in glaciers, ice and snow, 0.5–0.75% as fresh groundwater and soil moisture, and less than 0.01% of it as surface water in lakes, swamps and rivers.
Q.15) In which form least fresh water is available?
- Ice caps
- Ground water
- Lakes
- Rivers
Q 15) solution (4)
The distribution of water on the Earth’s surface is extremely uneven. Only 3% of water on the surface is fresh; the remaining 97% resides in the ocean. Of freshwater, 69% resides in glaciers, 30% underground, and less than 1% is located in lakes, rivers, and swamps
- Oceans: 97.3
- Ice-caps: 02.0
- Ground water: 0.68
- Fresh water lakes: 0.009
- Inland seas and
- salt lakes: 0.009
- Atmosphere: 0.0019
- Rivers: 0.0001
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