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

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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.

पर्याय

  • 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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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 1: Measurement - Exercise [पृष्ठ १२]

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

संबंधित प्रश्‍न

The nearest star to our solar system is 4.29 light years away. How much is this distance in terms of parsecs? How much parallax would this star (named Alpha Centauri) show when viewed from two locations of the Earth six months apart in its orbit around the Sun?


How many stamps are needed to cover the rectangle?


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?

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.

  • What is the length of the boundary of lake B in the drawing?

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.

  • Find the area of lake B on the drawing in square cm. What is its actual area in square km?

What unit will you use to measure the length of our classroom?


To measure the distance of a planet from the earth, ______ method is used.


  1. The earth-moon distance is about 60 earth radius. What will be the diameter of the earth (approximately in degrees) as seen from the moon?
  2. Moon is seen to be of (½)°diameter from the earth. What must be the relative size compared to the earth?
  3. From parallax measurement, the sun is found to be at a distance of about 400 times the earth-moon distance. Estimate the ratio of sun-earth diameters.

How many astronomical units (A.U.) make 1 parsec?


Mars has approximately half of the earth’s diameter. When it is closest to the earth it is at about 1/2 A.U. from the earth. Calculate what size it will appear when seen through the same telescope.


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