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तमिलनाडु बोर्ड ऑफ सेकेंडरी एज्युकेशनएसएसएलसी (अंग्रेजी माध्यम) कक्षा ९

Assertion (A): Distance between two celestial bodies is measured in terms of light year. Reason (R): The distance travelled by the light in one year is one light year. - Science

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प्रश्न

Assertion (A): Distance between two celestial bodies is measured in terms of light year.

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

विकल्प

  • Both A and R are true but R is not the correct reason.

  • Both A and R are true and R is the correct reason.

  • A is true but R is false.

  • A is false but R is true.

MCQ
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उत्तर

Both A and R are true and R is the correct reason.

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  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 1: Measurement - Exercise [पृष्ठ १२]

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सामाचीर कलवी Science [English] Class 9 TN Board
अध्याय 1 Measurement
Exercise | Q V. 3. | पृष्ठ १२

संबंधित प्रश्न

Have you seen frogs? Where? How many different types of frogs have you seen? Are all the frogs of the same length? Here are two interesting examples.


How wide is the rectangle? ________ cm


Now cut strips of equal sizes out of it. Using tape join the strips, end to end, to make a belt.

How long is your belt? _________


You can play this game on the ground. Make two squares of one square meter each. Divide your class into two teams. Ready to play!

  • How many of you can sit in one square meter?

You can play this game on the ground. Make two squares of one square meter each. Divide your class into two teams. Ready to play!

  • How many of you can stand in it?

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!!

Length is a fundamental quantity.


SI unit of electric current is ______.


Consider a sunlike star at a distance of 2 parsecs. When it is seen through a telescope with 100 magnification, what should be the angular size of the star? Sun appears to be (1/2)° from the earth. Due to atmospheric fluctuations, eye can’t resolve objects smaller than 1 arc minute.


According to the modern definition, what fraction of a second does light travel to define one metre?


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