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प्रश्न
What is measurement? How is a measurement expressed?
What is measurement?
उत्तर १
Measurement is a comparison of an unknown quantity with a known fixed quantity of the same kind.
The value obtained on measuring a quantity is called its magnitude. The magnitude of a quantity is expressed as numbers in its unit.
उत्तर २
Measurement is the process of finding an unknown physical quantity by using a standard quantity.
संबंधित प्रश्न
Fill in the blank
36 km h-1 = _______ ms-1.
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Distance travelled d = ________ × time t
The length, breadth and height of a water tank are 5 m, 2.5 m and 1.25 m respectively. Calculate the capacity of the water tank in (a) m3 (b) litre.
A solid silver piece is immersed in water contained in a measuring cylinder. The level of water rises from 50 ml to 62 ml. Find the volume of silver piece.
A piece of brass of volume 30 cm3 has a mass of 252 g. Find the density of brass in (i) g cm-3, (ii) kg m-3.
State two characteristics of a unit.
Define one metre, the S.I. unit of length. State it's one multiple and one submultiple.
Convert the following quantity as indicated:
2500 kg = ………. metric tonne.
Convert the following quantity as indicated:
150 kg = quintal
Answer the following in short.
What are derived physical quantities? Give any two examples of derived physical quantities.
Answer the following in short.
Mention any two advantages of the metric system over traditional units.
Tick the most appropriate answer.
Which of the following weighing devices has very high accuracy and sensitivity?
Fill in the blank.
There are ............. fundamental physical quantities.
State if the following statement is true or false. Correct the statement if it is false.
The average of a group of observations is calculated by adding all the observations and dividing the sum by the number of observations.
State if the following statement is true or false. Correct the statement if it is false.
Mercury does not stick to the surface of glass.
Answer the following in short.
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Answer the following in detail.
Explain in detail why railways and airlines use the 24-hour clock format.
Answer the following in detail.
When are approximations necessary in daily life and when should they be avoided?
What is the physical quantity? give example.
