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Which insturment is used for measuring d...

Which insturment is used for measuring distance upto `10^(-4)m ?`

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A vernier callipers is used for this purpose.
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PRADEEP-PHYSICAL WORLD AND MEASUREMENT-Very short Answer Questions
  1. What is the estimated size of aboservable universe ?

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  2. What is the average distance of moon from earth ?

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  3. Which insturment is used for measuring distance upto 10^(-4)m ?

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  4. How far away is the nearst star alpha centuri from earth ?

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  5. Name the device that can be used to measure the number of wavelengths ...

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  6. What does the word LASER stand for ?

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  7. What is the order of size of out galaxy ?

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  8. What is the order of mean free path of an aire molecule ?

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  9. What is the smallest mass measured indirectly so far?

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  10. How are the pitch and least count of a spherometer related ?

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  11. What is meant by angular diameter of moon ? What is its value?

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  12. What is the order of mass fo uiverse.

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  13. Which technique is used for measuring age of rocks, fossils etc.

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  14. Are there more microseconds in a second than the number of seconds in ...

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  15. Express in scientific notation : (i) 13780 kg (ii) 0.00000523 s

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  16. What is the efficiency of time realisation in cesium atomic clocks ?

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  17. What is the difference between inertial mass and gravitational mass of...

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  18. Which is the world's most accurate clock ? What is its accuracy?

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  19. What is the order of age of the earth ?

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  20. Human life expectancy is of the order of

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