Tag: science & technology

Birds are endothermic, meaning they generate internal heat through metabolic processes to maintain a constant body temperature regardless of environmental conditions. This contrasts with ectothermic animals like reptiles that rely on external heat sources. 'Endothermic' literally means 'heat from within.'

The candela (cd) is the SI base unit for luminous intensity, which measures the power of light emitted in a particular direction. Decibel measures sound intensity, Pascal measures pressure, and Coulomb measures electric charge. Only candela is related to light measurement.

The mole (mol) is the SI base unit for amount of substance, used to measure the quantity of chemical entities. Erg measures energy, quintal measures mass (a unit of weight), and light-year measures distance. Only mole is correct for amount of substance.

Power can be measured in both Watts (the SI unit) and Horse Power (a non-SI unit still widely used, especially for engines and vehicles). 1 horsepower ≈ 746 watts. Pascal measures pressure, and Lambert measures luminous intensity or brightness. Both B and D are correct for this MC-2 question.

Gauss is the unit of magnetic induction (also called magnetic flux density) in the CGS system. It measures the strength of a magnetic field. Electric flux is measured in units like Maxwell or Weber·m², stellar distance in parsecs or light-years, and luminous intensity in candela. Only option A is correct.

Venus is the only planet in our solar system that rotates clockwise (retrograde rotation), meaning it spins in the opposite direction from most planets including Earth. This retrograde rotation is a unique characteristic of Venus, though Uranus's extreme axial tilt complicates the directional description.

Toronto became the first city in the world to implement a computerized traffic signal system in 1963. This innovation used a central computer to coordinate traffic lights across the city, improving traffic flow and reducing congestion.

Charles Babbage is widely regarded as the Father of Computers for designing the Difference Engine and Analytical Engine in the 19th century, which laid the theoretical groundwork for modern computers. John Graham and Wilhelm Schickard were not primarily known as computer pioneers, and 'none of these' is incorrect since Babbage is the correct answer.

A standard PC keyboard typically has 104 keys, which includes the standard alphanumeric keys, function keys, navigation keys, and numeric keypad. This is the industry standard for full-size keyboards, though specialized keyboards may vary.

iPod Atomic was never an actual iPod model line. The real iPod series include iPod Mini, iPod Nano, iPod Shuffle, iPod Classic, and iPod Touch. 'iPod Atomic' is the correct answer as it's the fabricated option.