General Science & Technology Quiz

The CPU (Central Processing Unit) makes direct use of primary memory (RAM) during program execution. The CPU fetches instructions and data from RAM, processes them, and writes results back to RAM. The storage unit, output devices, and mass storage devices are secondary to the CPU-RAM interaction during active processing.

The keyboard shortcut Ctrl+Enter (or Ctrl+Enter on some systems) automatically adds 'www.' to the beginning and '.com' to the end of text typed in the browser's address bar. For example, typing 'google' and pressing Ctrl+Enter will navigate to 'www.google.com'. Alt+Enter typically opens the current location in a new tab.

1 terahertz (THz) equals 10^12 hertz. 1 kilohertz (kHz) equals 10^3 hertz. Therefore, 1 THz = 10^12 Hz = 10^12 / 10^3 kHz = 10^9 kHz = 1,000,000,000 kHz. Option A correctly shows this conversion. Options B, C have incorrect digit counts, and D has an extra zero.

The first 6 digits of a credit card number constitute the Issuer Identification Number (IIN), formerly called Bank Identification Number (BIN). These digits identify the card network (Visa, Mastercard, etc.) and the issuing bank. The Major Industry Identifier (MII) is actually just the first digit, not the first six. The account number and checksum follow the IIN.

Camels possess three eyelids on each eye, consisting of an upper lid, a lower lid, and a thin protective third eyelid.

Gold has the highest density (19.3 g/cm³) among these metals, making it the heaviest by volume. Silver has a density of 10.5 g/cm³, copper is 8.96 g/cm³, and 'alloy' refers to a mixture of metals rather than a pure metal. Gold's high density is why gold jewelry feels significantly heavier than it appears.

Butterflies are insects, and all insects have six legs by definition. Their legs are attached to the thorax (middle body segment) and are used for perching, tasting food through chemoreceptors, and in some species, grasping mates during courtship. The six-legged characteristic distinguishes insects from other arthropods.

Blue whales are the largest animals known to have ever lived, reaching up to 30 meters in length and weighing up to 200 tons. They're marine mammals, not fish. Elephants are the largest land mammals but are tiny compared to blue whales. Crocodiles aren't mammals at all - they're reptiles.

When Coca Cola was originally formulated by John Pemberton, it was a caramel-colored syrup mixed with carbonated water, giving it its classic brown appearance.

Rhino horns are composed of keratin, the same fibrous protein that makes up human hair and fingernails. Unlike antlers (which are bone), rhino horns have no bony core - they're solid masses of keratin fibers fused together. This is why rhino horns can be trimmed without pain, similar to cutting hair. 'Tusk' refers to elephant ivory (tooth material), not horn material.

Chandrayaan-I was India's first lunar satellite mission, launched in 2008. The other options - Aryabhatta, Rohini, and Bhaskar - were all Earth-orbiting satellites launched earlier. Chandrayaan-I successfully orbited the Moon and discovered water molecules on the lunar surface.

This statement is correct. Adult humans have 206 bones after many bones fuse together during growth and development. Babies are born with approximately 270-300 bones (sources vary), but many of these fuse through childhood - for example, the skull bones fuse, and vertebrae fuse together. By adulthood, the skeletal system typically consists of 206 bones, though some individuals may have slightly more due to extra small bones like sutural bones in the skull.

This statement is correct. Neurons (brain cells) can indeed survive and function for a person's entire lifetime, making them among the longest-living cells in the human body. Unlike most other cell types that regularly undergo cell division and replacement, most neurons are post-mitotic, meaning they don't divide after formation. While some neurons do die with aging or injury, many cerebral cortex neurons persist from birth until death, potentially living 80-100+ years. This longevity is why brain injuries are so devastating - lost neurons typically aren't replaced.

This statement is technically correct and was proven during the Pacific campaigns of World War II. Coconut water is sterile, isotonic with body fluids, and contains electrolytes similar to blood plasma. In emergency situations where medical supplies were unavailable, doctors successfully used young coconut water intravenously to rehydrate wounded soldiers. However, this is only a short-term emergency substitute - coconut water lacks proper proteins and has other differences from real plasma. It should never be used in modern medical settings except in absolute extreme emergencies without alternatives.