General Science and Technology Quiz

The femur, or thigh bone, is the longest and strongest bone in the human body. It's about 1/4 of a person's height and connects the hip to the knee.

DVD stands for Digital Versatile Disc (or Drive). It was named versatile because it can store various types of data - video, audio, software, and computer files - not just video.

Venus has the longest day in our solar system - it takes 243 Earth days to complete one rotation. This is longer than its year (225 Earth days). Venus rotates backwards compared to most planets.

Rocket engines operate on Newton's third law of motion - for every action, there is an equal and opposite reaction. The engine expels mass in one direction (action), creating thrust in the opposite direction (reaction). This principle, not gravity or energy conservation, is the fundamental mechanism. General relativity describes spacetime curvature but isn't the operating principle behind rocket propulsion.

Humans typically have 23 pairs of chromosomes, totaling 46 chromosomes per cell. These pairs include 22 pairs of autosomes and one pair of sex chromosomes (XX or XY). The question specifically asks for pairs, not total chromosomes. 18 and 36 are not standard human chromosome numbers. 46 is the total count, not the number of pairs.

The speed of light in vacuum is approximately 3 × 10^8 meters per second, a fundamental constant in physics. This value is denoted by 'c' and is the maximum speed at which all massless particles and waves can travel. The other options (10^9, 10^10, 10^11) are orders of magnitude too large. This constant is crucial in relativity and many areas of modern physics.

Uranus has several named moons including Oberon, Ariel, and Umbriel, which are among its largest. Titan, however, is Saturn's largest moon, not a moon of Uranus. The question asks which is NOT a moon of Uranus, making Titan the correct answer. Understanding planetary moon systems is fundamental to solar system astronomy.

A perfect number is a positive integer equal to the sum of its proper divisors (excluding itself). The smallest perfect number is 6 (1+2+3=6). Option A describes an abundant number. Option B describes prime numbers. Option D describes irrational numbers. Only option C correctly defines perfect numbers, a concept dating back to Greek mathematics.

The uncertainty principle, fundamental to quantum mechanics, states that certain pairs of physical properties cannot both be precisely determined. Werner Heisenberg first formulated this principle in 1927, revolutionizing physics. De Broglie proposed wave-particle duality. Bohr developed atomic theory. Einstein developed relativity. Only Heisenberg is correctly associated with the uncertainty principle.

ASCII stands for American Standard Code for Information Interchange. It's a character encoding standard for electronic communication. Option C correctly identifies both 'American' and 'Information Interchange' - the key components that distinguish it from the distractors. 'Intercom' in option A is incorrect as ASCII is not about communication devices.

CAID stands for Computer-Aided Industrial Design. This technology helps designers create and modify industrial products using computer systems. Option D is correct because CAID specifically refers to industrial design applications, not internal design (A), data (B), or information design (C).

DIVX stands for Digital Video Express. It was a digital video format developed by Circuit City for rental DVDs. Option B is correct - 'Express' is the right term. 'Entity' (A) is too vague, while 'Data Visual' (C) and 'Voice' (D) are incorrect expansions.

GPRS stands for General Packet Radio Service. It's a mobile data service that enables packet-based communication. Option A is correct - 'General' (not Global), 'Packet' (data transmission method), and 'Service' (not System or Render). GPRS is a 2.5G technology.

GSM stands for Global System for Mobile Communications. It's the standard for digital mobile networks. Option C is correct - 'Global' (worldwide), 'System' (technical framework), and 'Communications' (not Connections). GSM became the dominant mobile standard globally.