10 most difficult units riddlesUnits quiz
When did the USA introduce the metric system as preferred for weights and measures?
President Gerald Ford signed the Metric Conversion Act in1975. It declared the metric system "the preferred system of weights and measures for United States trade and commerce", but permitted the use of United States customary units in all activities. The metrification board was abolished in 1982 by President Ronald Reagan.
What was used as a unit of mass in the classical times?
a drop of lead
handful of sand
Carat, a unit of mass equal to 200 mg, is derived from a carob seed (Greek kerátion). People commonly believed that the seeds have unusually low variability in mass. Modern research denied this claim.
Saffir-Simpson scale is used to measure ...
Speed supersonic jets
Shock wave at nuclear explosion
Officially, the Saffir–Simpson hurricane wind scale is used only to describe hurricanes forming in the Atlantic Ocean and northern Pacific Ocean east of the International Date Line. Other areas use different scales to label these storms, which are called "cyclones" or "typhoons", depending on the area.
How many feet are there in a yard?
The yard is an English unit of length, in both the British imperial and US customary systems of measurement, that comprises 3 feet or 36 inches. It is by international agreement in 1959 standardized as exactly 0.9144 meters.
Which of these is not one of the basic units of the SI system?
The International System of Units (abbreviated as SI) is the modern form of the metric system, and is the most widely used system of measurement. It comprises a coherent system of units of measurement built on seven base units (ampere, kelvin, second, metre, kilogram, candela, mole) and a set of twenty decimal prefixes to the unit names and unit symbols.
What does the Bortle scale refer to?
spectrum of the stars
types of nebulae
brightness of the night sky
size of the planets
The Bortle scale is a nine-level numeric scale that measures the night sky's brightness of a particular location. It quantifies the astronomical observability of celestial objects and the interference caused by light pollution. It was created by John E. Bortle in 2001.
What does Mbps mean?
Million bytes per second
Megabytes per second
Million bits per sample
Million bits per second
Common data rate units are multiples of bits per second (bit/s) and bytes per second (B/s). For example, the data rates of modern residential high-speed Internet connections are commonly expressed in megabits per second (Mbit/s).
What units are used in the stun grenade specifications, to describe its power?
decibels and candelas
kilograms of equivalent TNT
The M84 grenade on the photo emits 170–180 decibels and 6–8 million Candela within a 5-foot (1.5 m) radius. The loud blast causes temporary loss of hearing, and also loss of balance by disturbing the fluid in the ear. The flash makes vision impossible for approximately five seconds.