Free Environment and Atmosphere MCQs with Answers

11. The sunlight can reach a depth of___________meters in the ocean

• A. 80
• B. 200
• C. 120
• D. None

Explanation: Useful sunlight generally penetrates the ocean's euphotic zone to about 200 metres, although the exact depth varies with water clarity. Below this zone, photosynthesis becomes very limited.

12. Albatros is__________?

• A. A sea bird
• B. A beetle
• C. A fruit
• D. None

Explanation: An albatross is a large ocean-going seabird known for its very long wings and efficient gliding over the sea. It is neither a beetle nor a fruit.

13. The Green House Effect is caused by an excess of ?

• A. Carbon dioxide
• B. Carbon monoxide
• C. Carbon tetrachloride
• D. None of the above

Explanation: Carbon dioxide absorbs outgoing infrared radiation and helps trap heat in the atmosphere, strengthening the greenhouse effect when its concentration rises. Other greenhouse gases also contribute, but carbon dioxide is the intended option here.

14. Most of the ozone in the atmosphere is concentrated in the _____________?

• A. Mesosphere
• B. Troposphere
• C. Stratosphere
• D. ionosphere

Explanation: The stratosphere contains the ozone layer, where most atmospheric ozone absorbs harmful ultraviolet radiation. The troposphere contains most weather but only a small amount of ozone.

15. The instrument which i specially design for recording earth quake wave is called seismograph which measure earth quake waves on a ____________?

• A. Diatonic scale
• B. Fahrenheit Scale
• C. Richter scale
• D. Celsius Scale
• E. None of these

Explanation: A seismograph records earthquake vibrations, while the Richter scale expresses the earthquake's magnitude. The other scales listed measure temperature or are unrelated.

16. The deepest place on earth is ____________?

• A. Trench
• B. Mariana Trench
• C. Mangrove
• D. Groove
• E. None of these

Explanation: The Mariana Trench in the western Pacific contains Challenger Deep, the deepest known point on Earth's ocean floor. A trench is the general landform, whereas Mariana Trench is the specific name.

17. The Continent Antarctica lies at the__________?

• A. North pole
• B. South pole
• C. middle of the earth
• D. Equator
• E. None of these

Explanation: Antarctica surrounds the geographic South Pole and is the southernmost continent. The North Pole lies in the Arctic region, which is ocean surrounded by land.

18. Animal which captures and readily kills living animals for its food is called___________?

• A. Parasite
• B. Scavenger
• C. Predator
• D. Mammal
• E. None of these

Explanation: A predator actively captures and kills living prey for food. A scavenger mainly feeds on animals that are already dead, while a parasite lives on or in a host.

19. The fruits without seed, like banana, are called_____________?

• A. Seedless fruits
• B. Parthenogenesis fruits
• C. Parthenocarpic fruits
• D. placental fruits
• E. Organic fruits

Explanation: Parthenocarpic fruits develop without fertilisation, so they normally contain no mature seeds; bananas are a common example. Parthenogenesis refers mainly to development of an embryo from an unfertilised egg, not fruit formation.

20. Oasis is associated with___________?

• A. Glaciers
• B. Desert
• C. Islands
• D. Volcanoes
• E. Fertile land

Explanation: An oasis is a fertile, watered place surrounded by desert, usually formed where groundwater reaches the surface. Its vegetation and water make settlement possible in an otherwise dry region.