Insights Static Quiz -121, 2018
Physical Geography and Environment
INSIGHTS IAS QUIZ ON STATIC SYLLABUS - 2018
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Question 1 of 5
1. Question
Which of the following are true
- Energy released during earthquake travels in all directions
- The energy gets released due to friction between rocks in earthquake
Select the right code
Correct
Answer – a
- An earthquake in simple words is shaking of the earth. It is a natural event. It is caused due to release of energy, which generates waves that travel in all directions.
- The release of energy occurs along a fault. A fault is a sharp break in the crustal rocks. Rocks along a fault tend to move in opposite directions. As the overlying rock strata press them, the friction locks them together. However, their tendency to move apart at some point of time overcomes the friction. As a result, the blocks get deformed and eventually, they slide past one another abruptly. This causes a release of energy, and the energy waves travel in all directions.
Incorrect
Answer – a
- An earthquake in simple words is shaking of the earth. It is a natural event. It is caused due to release of energy, which generates waves that travel in all directions.
- The release of energy occurs along a fault. A fault is a sharp break in the crustal rocks. Rocks along a fault tend to move in opposite directions. As the overlying rock strata press them, the friction locks them together. However, their tendency to move apart at some point of time overcomes the friction. As a result, the blocks get deformed and eventually, they slide past one another abruptly. This causes a release of energy, and the energy waves travel in all directions.
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Question 2 of 5
2. Question
Earthquakes generally occurs at depth upto
Correct
Answer – A
All natural earthquakes take place in the Lithosphere where lithosphere refers to the portion of depth up to 200 km from the surface of the earth.
Incorrect
Answer – A
All natural earthquakes take place in the Lithosphere where lithosphere refers to the portion of depth up to 200 km from the surface of the earth.
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Question 3 of 5
3. Question
Consider the statements below about earthquake waves
- Body waves originate before surface waves
- Their velocity remains after their origin
Which of the following is/are true
Correct
Answer – A
- Earthquake waves are basically of two types — body waves and surface waves.
- Body waves are generated due to the release of energy at the focus and move in all directions travelling through the body of the earth. The body waves interact with the surface rocks and generate new set of waves called surface waves. These waves move along the surface.
- The velocity of waves changes as they travel through materials with different densities. The denser the material, the higher is the velocity. Their direction also changes as they reflect or refract when coming across materials with different densities
Incorrect
Answer – A
- Earthquake waves are basically of two types — body waves and surface waves.
- Body waves are generated due to the release of energy at the focus and move in all directions travelling through the body of the earth. The body waves interact with the surface rocks and generate new set of waves called surface waves. These waves move along the surface.
- The velocity of waves changes as they travel through materials with different densities. The denser the material, the higher is the velocity. Their direction also changes as they reflect or refract when coming across materials with different densities
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Question 4 of 5
4. Question
Consider the following differences between p and s waves
- P waves are faster than S waves
- P waves change the density of material through which they travel, unlike S waves
- S waves damages the structures on the earth more than P waves
Which of the above is/are correct
Correct
Answer – D
There are two types of body waves. They are called P and S-waves.
- P-waves move faster and are the first to arrive at the surface. These are also called ‘primary waves’. S-waves arrive at the surface with some time lag. These are called secondary waves.
- P-waves vibrate parallel to the direction of the wave. This exerts pressure on the material in the direction of the propagation. As a result, it creates density differences in the material leading to stretching and squeezing of the material.
- The direction of vibrations of S-waves is perpendicular to the wave direction in the vertical plane. Hence, they create troughs and crests in the material through which they
pass. Surface waves are thus considered to be the most damaging waves.
Incorrect
Answer – D
There are two types of body waves. They are called P and S-waves.
- P-waves move faster and are the first to arrive at the surface. These are also called ‘primary waves’. S-waves arrive at the surface with some time lag. These are called secondary waves.
- P-waves vibrate parallel to the direction of the wave. This exerts pressure on the material in the direction of the propagation. As a result, it creates density differences in the material leading to stretching and squeezing of the material.
- The direction of vibrations of S-waves is perpendicular to the wave direction in the vertical plane. Hence, they create troughs and crests in the material through which they
pass. Surface waves are thus considered to be the most damaging waves.
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Question 5 of 5
5. Question
Consider the following statements
- Hypocentre is the point which originates earthquake
- Epicentre is the point on the surface of the earth which is closest to origin point of earthquake
Which of the above is/are correct
Correct
Answer – c
- The point where the energy is released is called the focus of an earthquake, alternatively, it is called the hypocentre. The energy waves travelling in different directions reach the surface.
- The point on the surface, nearest to the focus, is called epicentre. It is the first one to experience the waves. It is a point directly above the focus.
Incorrect
Answer – c
- The point where the energy is released is called the focus of an earthquake, alternatively, it is called the hypocentre. The energy waves travelling in different directions reach the surface.
- The point on the surface, nearest to the focus, is called epicentre. It is the first one to experience the waves. It is a point directly above the focus.
