Q3 of 44 Page 19

Assertion(A): The scientifically correct expression is “ The mass of the bag is 10 kg”
Reason (R): In everyday life, we use the term weight instead of mass

Reason behind assertion is “Kilogram is SI unit of mass”. So, for correct scientific expression, mass of the bag is 10 kg.

Assertion (A): The SI system of units is the improved system of units for measurement.

Reason (R): The SI unit of mass is kilogram

Assertion (A): The skill of estimation is important for all of us in our daily life.

Reason (R): The skill of estimation reduces our consumption of time

Assertion (A): 0 °C = 273.16 K. For our convenience we take it as 273 K after rounding off the decimal

Reason (R): To convert a temperature on the Celsius scale you have to add 273 to the given temperature

Assertion (A): The distance between two celestial bodies is measured in the unit of light year

Reason (R): The distance travelled by the light in one year is one light year

Questions · 44

1. Measurement and Measuring Instruments

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Assertion(A): The scientifically correct expression is “ The mass of the bag is 10 kg”Reason (R): In everyday life, we use the term weight instead of mass