. What is mass?
Name two multiples and two submultiples
Define standard metre.
What is time? What is its SI unit?
Name two devices used to measure time.
What do you mean by temperature? State
ine the following:
One metre
One kilo
Answers
1. A large body of matter with no definite shape.
2.Multiple units: Ton , Quintal used for measuring heavy weights like lorries,flats etc. Sub-multiple units:Gram , Centigram , Decigram , Milligram , Nanogram used for measuring very light .
3.The metre is defined as the length of the path travelled by light in a vacuum in 1299 792 458 of a second. ... The metre was originally defined in 1793 as one ten-millionth of the distance from the equator to the North Pole along a great circle, so the Earth's circumference is approximately 40000 km.
4.The second, symbol s, is the SI unit of time. It is defined by taking the fixed numerical value of the cesium frequency ΔνCs, the unperturbed ground-state hyperfine transition frequency of the cesium 133 atom, to be 9 192 631 770 when expressed in the unit Hz, which is equal to s-1.
5. Clock and hourglass
6.A measure of the ability of a substance, or more generally of any physical system, to transfer heat energy to another physical system. The temperature of a substance is closely related to the average kinetic energy of its molecules.
7.The fundamental unit of length in the metric system, equal to 100 centimetres or approximately 39.37 inches.
A kilogram.