What is a light-year a measurement of?

Distance — the distance light travels in one year. A light-year measures distance: how far light travels in vacuum in one year. The year specifies the travel interval used to define that distance. It does not make the unit a measure of time, temperature or mass.

Which pair completes metre, kilogram, second, ampere and kelvin as the seven SI base units?

mole and candela. The remaining base units are mole for amount of substance and candela for luminous intensity. The other pairs contain derived units. Learn the full seven-unit set rather than treating a short list of common units as complete.

What is 1 cm² expressed in square metres?

0.0001 m². One centimetre equals 0.01 metre. Area contains two length factors, so square the conversion factor. Thus, 1 cm² = (0.01 m)² = 0.0001 m². The 0.01 m² choice incorrectly uses the length factor only once.

Repeated readings are 9.80, 9.81 and 9.80 cm for a reference length of 10.00 cm. What do they illustrate?

Close agreement can coexist with a consistent offset. The readings are closely grouped, showing good repeatability in this example. They are consistently below the reference value. A shared offset can make precise readings inaccurate. Averaging helps with random variation but does not automatically remove this offset.

What does the SI unit symbol H represent?

henry, for inductance. H is the symbol for henry, the SI unit of inductance. Hertz measures frequency and uses Hz. Kelvin uses K. Halogen names a chemical family rather than the SI unit represented by H.

At fixed voltage, a uniform wire's length is halved. Its material, temperature and area stay unchanged. How does its current change?

It doubles. Resistance is proportional to length under these conditions, so it halves. For an ohmic wire, I = V/R. At the same voltage, halving resistance doubles current. This ideal comparison neglects other circuit resistances and meter effects; stretching the wire would be a different change.

Using K = C + 273.15 and F = 1.8C + 32, what Celsius reading makes K and F numerically equal?

301.4375°C. Set C + 273.15 = 1.8C + 32. Rearrangement gives 0.8C = 241.15, so C = 301.4375. The shared kelvin/Fahrenheit number is 574.5875, not the Celsius answer. These readings use the specified exact conversion rather than a rounded offset of 273.

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A solid has relative density 19.3. Using water’s reference density of 1000 kg/m³, what is the solid’s density?

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A solid has relative density 19.3. Using water’s reference density of 1000 kg/m³, what is the solid’s density?

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