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तामिळनाडू बोर्ड ऑफ सेकेंडरी एज्युकेशनएस.एस.एल.सी. (इंग्रजी माध्यम) इयत्ता ९

Rulers, measuring tapes and metre scales are used to measure

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प्रश्न

Rulers, measuring tapes and metre scales are used to measure ______

पर्याय

  • mass

  • weight

  • time

  • length

MCQ
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उत्तर

Rulers, measuring tapes and metre scales are used to measure Length

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 1: Measurement - Exercise [पृष्ठ ११]

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सामाचीर कलवी Science [English] Class 9 TN Board
पाठ 1 Measurement
Exercise | Q I. 2. | पृष्ठ ११

संबंधित प्रश्‍न

Solve the numerical example.

When the planet Jupiter is at a distance of 824.7 million kilometers from the Earth, its angular diameter is measured to be 35.72'' of arc. Calculate the diameter of Jupiter.


Guess whose tail is the longest. Now measure the tails. How good is your guess?


Difference in size
Do this for yourself and find the difference.


So Anar also tried many different ways to make a boundary for 800 square meters of land.

He made rectangles A, B, and C of different sizes. Find out the length of the boundary of each. How much gold wire will he get for these rectangles?


  • Gold wire for A = _________ metres

  • Gold wire for B = _________ metres
  • C  
    Gold wire for C = __________ metres

But then Anar made an even longer rectangle... See how long!


  • So he will get __________ metres of gold wire!!

There are two beautiful lakes near a village. People come for boating and picnics in both the lakes. The village Panchayat is worried that with the noise of the boats the birds will stop coming. The Panchayat wants motorboats in only one lake. The other lake will be saved for the birds to make their nests.

  • A longer boundary around the lake will help more birds to lay their eggs. So which lake should be kept for birds? Which lake should be used for boats?

The SI unit of mass is kg.


In an experiment to estimate the size of a molecule of oleic acid 1 mL of oleic acid is dissolved in 19 mL of alcohol. Then 1 mL of this solution is diluted to 20 mL by adding alcohol. Now 1 drop of this diluted solution is placed on water in a shallow trough. The solution spreads over the surface of water forming one molecule thick layer. Now, lycopodium powder is sprinkled evenly over the film and its diameter is measured. Knowing the volume of the drop and area of the film we can calculate the thickness of the film which will give us the size of oleic acid molecule.

Read the passage carefully and answer the following questions:

  1. Why do we dissolve oleic acid in alcohol?
  2. What is the role of lycopodium powder?
  3. What would be the volume of oleic acid in each mL of solution prepared?
  4. How will you calculate the volume of n drops of this solution of oleic acid?
  5. What will be the volume of oleic acid in one drop of this solution?

If a planet subtends an angle α at distance D, what formula is used to find the planet's diameter?


What is an Astronomical Unit (AU)?


Why is the speed of light used to define the metre?


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