science & technology Online Quiz - 108

The Tejas (Light Combat Aircraft) is India's indigenous single-seat, single-engine, multirole light fighter designed by HAL. It was inducted into the Indian Air Force squadron in 2016. The other options are either foreign aircraft (Su-30 MKI is Russian), helicopters (Chetak), or civilian aircraft (Nal Saras).

The Boeing 747 earned the nickname 'Jumbo Jet' due to its massive size - it was the first wide-body jet airliner and the largest passenger aircraft when introduced in 1969. The name 'Jumbo' (after the famous elephant) became iconic, and the 747 is still commonly referred to as the 'Queen of the Skies' or 'Jumbo Jet.'

Darker green vegetables generally contain higher concentrations of vitamins, including vitamin C, because the darker color indicates higher chlorophyll content and typically greater nutrient density. Vegetables like kale, spinach, and broccoli (dark green) tend to have more vitamin C than lighter greens like iceberg lettuce or celery.

Transport aircraft like cargo planes and passenger airliners do not have ejection seats. Ejection seats are found in military fighter aircraft and some trainer aircraft, where rapid escape is necessary during emergencies. Transport aircraft rely on emergency exits and evacuation slides instead.

Botanically, pumpkins are fruits because they develop from the flower's ovary and contain seeds, which is the definition of a fruit. Vegetables are other plant parts like roots, stems, and leaves. While pumpkins are treated as vegetables in culinary contexts, scientifically they are not vegetables.

Transonic speed range is the transition region between subsonic and supersonic flight, occurring at Mach 0.8 to 1.2. Below Mach 0.8 is fully subsonic, and above Mach 1.2 is fully supersonic. In the transonic region, airflow over different parts of the aircraft can be at different speeds.

Carrots were originally purple, yellow, and white in color. The orange carrot is a relatively recent development, bred in the Netherlands in the 17th century. Purple carrots were the original color, containing anthocyanin pigments, while orange carrots get their color from beta-carotene.

Onions and potatoes should not be stored together because they cause each other to spoil faster. Onions release gases that cause potatoes to sprout and rot more quickly, while the moisture from potatoes can make onions mold. Store them separately in cool, dry places for optimal shelf life.

Alexander Graham Bell's mother and his wife Mabel both suffered from hearing loss, which deeply motivated his lifelong work in acoustics and the invention of the telephone.

Approximately 90% of the world's population is right-handed, not 11%. Left-handedness occurs in about 10% of people, with ambidextrous individuals making up a very small percentage. The claimed figure of 11% is far too low for right-handedness.

Sneezing triggers an involuntary reflex that causes the eyes to close automatically, but it is physically possible to keep your eyes open during a sneeze if you consciously force them.

Certain species of flatworms and other simple worms can exhibit cannibalistic behavior, consuming parts of their own bodies when starved for prolonged periods.

Most birds can see blue - in fact, many birds have tetrachromatic vision with four types of color receptors, allowing them to see into the ultraviolet spectrum. Owls are not unique in seeing blue; many birds have excellent color vision including blue perception.

Africa is one of the most linguistically diverse continents in the world, with estimates ranging between 1,500 and 2,000 different languages spoken across its nations. Therefore, the statement that more than 1,000 different languages are spoken there is correct.

The tongue is attached at both ends - to the hyoid bone and the mandible (lower jaw). Additionally, other muscles in the body are also attached at only one end, such as some facial muscles. The statement is factually incorrect on both counts.

Dragonflies are remarkable fliers, but the numbers in this statement are inaccurate. Dragonflies flap their wings around 30-40 times per second (not 28), and their top speed is approximately 30-35 mph (not 60 mph). While impressive, the exaggerated figures make the statement false.

The Bugatti Veyron Super Sport reaches approximately 407 km/h (253 mph), making it one of the fastest production cars ever built. Option B correctly states this speed in km/h.