Free Environment and Atmosphere MCQs with Answers

221. How many time zones are there in the world?

• A. 22
• B. 12
• C. 16
• D. 24

Explanation: The conventional global time-zone system divides the 360 degrees of longitude into 24 zones of about 15 degrees each. Some regions use half-hour or quarter-hour offsets, but the standard answer remains 24.

222. What natural phenomena are measured by the Richter Scale?

• A. Volcanoes
• B. Typhoons
• C. Earth quacks
• D. Tsunami

Explanation: The Richter scale measures the magnitude of earthquakes by relating it to the amplitude of seismic waves. Volcanoes, typhoons, and tsunamis are not directly measured by this scale.

223. What melted rock eventually becomes lava?

• A. Iron
• B. Metals
• C. Magma
• D. Coal

Explanation: Magma is molten rock beneath Earth's surface; when it erupts and reaches the surface, it is called lava. Iron, other metals, and coal are not the general source described here.

224. What prevents the earth's atmosphere from drifting away into space?

• A. Gravity
• B. Ozone layer
• C. Troposphere
• D. Ecosystem

Explanation: Earth's gravity continually attracts atmospheric gases toward the planet and prevents them from escaping into space. The ozone layer protects against ultraviolet radiation but does not hold the atmosphere down.

225. Who is Considered as Father of Botany?

• A. Aristotle
• B. Gregor Joghn Mandle
• C. Theophrastus
• D. Corlous Linnaeous

Explanation: Theophrastus is regarded as the Father of Botany because he systematically described and classified many plants in his works. Aristotle is associated mainly with early zoology, while Linnaeus is known for modern biological classification.

226. How many layers of Atmosphere?

• A. 2
• B. 3
• C. 4
• D. 5

Explanation: The atmosphere is conventionally divided into five layers: troposphere, stratosphere, mesosphere, thermosphere and exosphere. Some classifications combine layers or add subdivisions, but five is the standard school-level answer.

227. A body of land that is surrounded by water on three sides is called________?

• A. Strait
• B. Bay
• C. Peninsula
• D. Gulf

Explanation: A peninsula is a landform almost surrounded by water but connected to a larger landmass on one side. A strait is a narrow water passage, while a bay and gulf are bodies of water partly enclosed by land.

228. The study of fish is known as ________?

• A. Entomology
• B. Ichthyology
• C. Ecology
• D. None of these

Explanation: Ichthyology is the branch of zoology concerned with fish, including their classification, behaviour and biology. Entomology instead deals with insects.

229. The scientific study of insects is known as _______?

• A. Ichthyology
• B. Entomology
• C. Zoology
• D. Botany

Explanation: Entomology is the scientific study of insects. Ichthyology studies fish, whereas botany studies plants.

230. The study of organisms and their environment is known as ________?

• A. Acoustics
• B. Ecology
• C. Ichthyology
• D. None of these

Explanation: Ecology examines relationships between organisms and their physical surroundings, including food chains and habitats. Acoustics is the study of sound.