JU
G. Answer the following questions:
1. What is meant by measurement?
2. What do you understand by the term unit?
3. State two characteristics of a standard unit.
4. Define length. What is its SI unit?
5. Name two devices used for measuring length.
6. What is mass?
7. Name two multiples and two submultiples of the unit of mass.
8. Define standard metre.
9. What is time? What is its SI unit?
10. Name two devices used to measure time.
11. What do you mean by temperature? State the SI unit of temperature.
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1.the size, length, or amount of something, as established by measuring.
2.The definition of a unit is a fixed standard amount or a single person, group, thing or number. ... An example of a unit is a single apartment in an apartment building.
3.Following are the important characteristics of standard unit: (i) It should be easily understandable. (ii) It should be changed with change in physical factors. (iii) It should not change with place or time
4.The meter, symbol m, is the SI unit of length. It is defined by taking the fixed numerical value of the speed of light in vacuum c to be 299 792 458 when expressed in the unit m s-1, where the second is defined in terms of ΔνCs. Unit of mass. kilogram. The kilogram, symbol kg, is the SI unit of mass.
5.Instruments like vernier calliper, metric rulers, scales and measuring tapes are commonly used to measure length.
6.a large body of matter with no definite shape.
7.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 .
8.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.
9.Time is a quantity , which is the ratio of distance and speed and its S.I.unit is second.
10.An instrument used to measure time is called a clock. People used instruments such as sundials and hourglass to keep track of time. The movement of the shadow of a rod stuck upright in the ground, whose shadow changed direction with the movement of the sun across the sky, was used to make crude sundials.
11.the degree or intensity of heat present in a substance or object, especially as expressed according to a comparative scale and shown by a thermometer or perceived by touch.
degree Celsius
Celsius is currently a derived unit for temperature in the SI system, kelvin being the base unit. The abbreviation of Celsius is °C (degree Celsius) and the size of one Celsius degree is the same size as one kelvin.
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