General Science & Technology Quiz

When landing gear is retracted in an aircraft, the wheels and struts fold up into the wheel wells. To maintain aerodynamic smoothness, the undercarriage doors (which cover these wheel wells) must close after the gear is fully retracted. This completes the retraction process. The flaps, slats, and gear itself are separate components. Option B (Closing of Under Carriage door) is correct.

The Concorde crash (Flight 4590 on July 25, 2000) was caused by a titanium strip debris on the runway from a Continental Airlines DC-10 that punctured a Concorde tire, sending debris into the fuel tank and igniting a fire. None of the listed options (Reverse Thrust Generator Failure, Fuel Cross Feed Failure, or Horizontal Stabilizer Failure) describe the actual cause.

Brass is a metallic alloy composed primarily of copper and zinc, widely used in musical instruments, plumbing fixtures, and decorative items due to its durability and gold-like appearance.

Fish breathe through gills, which are specialized organs that extract dissolved oxygen from water and release carbon dioxide, allowing them to survive underwater.

Woodpeckers have zygodactyl feet with two toes facing forward and two backward, providing the grip and leverage needed to climb vertical tree trunks while searching for insects.

At high altitudes like Mount Everest, atmospheric pressure is significantly lower, reducing water's boiling point to approximately 69-71°C.

The Milky Way is a barred spiral galaxy containing our solar system and billions of stars, not merely a constellation or solar system.

Sharks have skeletons made of cartilage rather than bone, which makes them lighter and more flexible swimmers compared to bony fish.

Mercury is the only metal that exists in liquid state at standard room temperature (20-25°C). Bromine is the only other non-metal element that is liquid at room temperature.

Hg is the chemical symbol for Mercury, derived from its Latin name 'Hydrargyrum' meaning 'liquid silver'. Copper is Cu, Helium is He, and Sodium is Na.

The most widely accepted scientific theory is that a massive meteorite impact 66 million years ago caused the Cretaceous-Paleogene extinction event. The impact created dust clouds that blocked sunlight, disrupted ecosystems, and led to the dinosaurs' extinction.

Photosynthesis is the process by which plants convert light energy (usually from sunlight), carbon dioxide, and water into glucose and oxygen. Chemosynthesis is used by some bacteria, not plants.

Monotremes are a group of egg-laying mammals. Both the platypus and echidna (spiny anteater) are monotremes found in Australia and New Guinea. They are the only mammals that lay eggs instead of giving live birth.

Mars appears red because its surface is covered with iron oxide (rust), which gives the planet its characteristic reddish-orange color. This iron-rich dust and rock material has been oxidized over billions of years, creating the distinctive red hue visible from Earth.

Mars has two small moons named Phobos and Deimos. Both are irregularly shaped and much smaller than Earth's moon, and are thought to be captured asteroids that orbit close to the planet's surface.

Analysis of Martian soil by NASA's Phoenix lander and other missions has revealed that the soil is slightly alkaline, with a pH around 8-9. This surprised scientists who initially expected acidic conditions similar to Earth's volcanic environments.

Liquid water cannot exist on Mars' surface primarily because of the extremely low atmospheric pressure, which is about 1% of Earth's. At such low pressure, water either boils away immediately or remains frozen, making stable liquid water impossible on the surface.

Mars is not currently geologically active like Earth, as it lacks plate tectonics and significant volcanic activity. While it may have been geologically active billions of years ago, current evidence shows Mars is mostly geologically dormant today.

Clouds are primarily composed of water in the form of tiny water droplets or ice crystals. Water vapor condenses around particles to form clouds.