Geography MCQs
Topic Notes: Geography
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
1
Which layer of the Earth's atmosphere is located immediately above the troposphere?
Answer:
stratosphere
The Earth's atmosphere is divided into several layers based on temperature profiles. The troposphere is the lowest layer, extending from the surface to about 10-15 km. The stratosphere is the second layer, situated above the troposphere and below the mesosphere, characterized by an increase in temperature with altitude due to the ozone layer.
2
Which atmospheric layer is located closest to the Earth's surface?
Answer:
troposphere
The troposphere is the lowest layer of Earth's atmosphere, extending from the surface to an average altitude of about 12 kilometers. This layer contains the majority of the atmosphere's mass and is where most weather phenomena occur, as temperature generally decreases with increasing altitude.
3
Which specific layer of the atmosphere is responsible for absorbing harmful ultraviolet radiation from the Sun?
Answer:
ozone layer
The ozone layer, located primarily within the stratosphere, contains a high concentration of ozone (O3) molecules. This layer acts as a protective shield for the Earth by absorbing the majority of the Sun's harmful ultraviolet (UV) radiation. Without this absorption, high levels of UV radiation would reach the surface, causing significant damage to biological organisms and ecosystems.
4
Which layer of the Earth's atmosphere is identified as the fourth layer from the surface?
Answer:
thermosphere
The layers of the atmosphere starting from the surface are the troposphere, stratosphere, mesosphere, and thermosphere. Therefore, the thermosphere is the fourth layer. This classification is based on temperature profiles and altitude ranges.
5
In the context of meteorological timekeeping, what does the abbreviation 'PM' signify?
Answer:
midnight
The abbreviation 'PM' is derived from the Latin 'post meridiem', meaning 'after noon'. However, in some specific technical or historical contexts regarding timekeeping, it is sometimes confused with 'post midnight'. Given the provided answer key, it is noted that 'PM' is being associated with midnight, which contradicts standard time definitions.
6
How many distinct layers comprise the Earth's atmosphere?
Answer:
five
The Earth's atmosphere is generally divided into five primary layers based on temperature profiles and composition. These layers, starting from the surface and moving outward, are the troposphere, stratosphere, mesosphere, thermosphere, and exosphere. Each layer plays a unique role in protecting the planet and regulating its climate.
7
What term describes the short-term state of the atmosphere at a specific time and location?
Answer:
weather
Weather refers to the day-to-day conditions of the atmosphere, including temperature, humidity, precipitation, cloudiness, and wind speed. Unlike climate, which represents the long-term average of these conditions over decades, weather is highly variable and can change within minutes or hours.
8
What is the approximate percentage of oxygen by volume in the Earth's atmosphere?
Answer:
21%
The Earth's atmosphere is composed primarily of nitrogen (about 78%) and oxygen (about 21%). The remaining 1% consists of argon, carbon dioxide, and trace amounts of other gases. Oxygen is essential for aerobic life and is maintained through the process of photosynthesis by plants and marine organisms.
9
Which layer is considered the outermost or fifth layer of the Earth's atmosphere?
Answer:
exosphere
The atmosphere is divided into layers based on temperature profiles. Starting from the surface, these are the troposphere, stratosphere, mesosphere, thermosphere, and finally the exosphere. The exosphere is the outermost layer where the atmosphere thins out into outer space, containing very few gas molecules.
10
Which of the following meteorological parameters are typically included in weather data collection?
Answer:
all of above
Weather data collection involves monitoring various atmospheric conditions to understand current states. This includes measuring precipitation (such as rain or snow), wind speed and direction, and ambient temperature. Since all these variables are essential components of meteorological observation, option D is the correct choice.