No 46 Standard units of measurement

What units are used to measure distance traveled?

• Kilograms

• Feet and inches

• Miles or kilometres

• Hours

What is a common unit of weight in the metric system?

• Pounds

• Kilograms

• Stones

• Miles

What is the floor area of this room measured in?

• Square metres

• Square feet

• Square yards

• Square inches

What is a disadvantage of using different units in a project?

• Increased efficiency

• Inability to determine quantities

• Better resource management

• Enhanced accuracy

How many hours are there in a day?

• 12

• 24

• 36

• 48

What is the purpose of defining a second using a cesium-133 atom?

• To ensure accuracy in time measurement.

• To simplify calculations.

• To reduce the cost of clocks.

• To increase the speed of time.

What is the equivalent of one ampere in terms of voltage and resistance?

• 1 volt through 0.5 ohms

• 1 volt through 1 ohm

• 2 volts through 1 ohm

• 2 volts through 0.5 ohms

What is the official scientific definition of a Kelvin?

• A unit of absolute temperature equal to 1/273 of the absolute temperature of the triple point of water.

• A unit of temperature equal to 1/100 of the boiling point of water.

• A unit of temperature used to measure the heat of the sun.

• A unit of temperature equal to 1/273 of the freezing point of water.

How is the Kelvin scale derived?

• By dividing the boiling point of water by 100.

• By setting zero at absolute zero and each degree equal to 1 Kelvin.

• By setting zero at the freezing point of water.

• By setting zero at the boiling point of water.

What is the official scientific definition of a candela?

• The luminous intensity in a given direction of a source that emits monochromatic radiation of frequency 540 × 10¹² hertz and that has a radiant intensity in that direction of (1/683) watt per steradian.

• The total energy emitted by a source in all directions.

• The amount of light passing through a given area.

• The brightness of a light source as perceived by the human eye.