Question

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Answer 1

Answer:

1.the comparison of an unknown physical quantity with a known standard quantity of the same kind is called measurement. In order to express measurement we must do following things:

i.the unit in which a physical quantity is measured.

ii.the numerical value which expresses how many times a unit is contained in the given physical quantity.

2. The characteristics of a unit are as follows:

i.well-defined

ii. invariability

3. beam balance, thermometer, watch, digital balance.

4. i. Mass: kilogram(kg)

  ii. Length: meter(m)

iii. time: second(s)

iv. temperature: kelvin(K)

Explanation:

Answer 2

Answer:

We use instruments to get an exact measurement. The four basic measurements in our daily life are,

1. Length

2. Mass

3. Time

4. Temperature