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You are given a thread and a metre scale...

You are given a thread and a metre scale. How will you estimate the diameter of the thread ?

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A galvanometer coil has a resistance of 15Omega and the metre shows full scale deflection for a current of 4 mA. How will you convert the metre into an ammeter of range 0 to 6 A ?

A galvanometer coil has a resistance of 15 Omega and the metre shows full scale deflection for a current of 4 mA. How will you convert the metre into an ammeter of range 0 to 6 A?

NCERT GUJARATI-UNITS AND MEASUREMENT-EXERCISE
  1. Which of the following is the most precise device for measuring length...

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  2. A student measures the thickness of a human hair by looking at it thro...

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  3. You are given a thread and a metre scale. How will you estimate the di...

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  4. A screw gauge has a pitch of 1.0mm and 200 divisions on the circular s...

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  5. The mean diameter of a thin brass rod is to be measured by vernier cal...

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  6. The photograph of a house occupies an area of 1.75 cm^(2) on a 35 mm s...

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  7. State the number of significant 0.007 m^(2)

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  8. State the number of significant 2.64xx10^(24) kg

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  9. State the number of significant 0.2370 g cm^(-3)

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  10. The length , breadth and thickness of a rectangular sheet of metal are...

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  11. The mass of a box measured by a grocer's balance is 2.30 kg. Two gold ...

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  12. A physical quantity P is related to four observables a,b,c and d as fo...

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  13. A book with many printing errors contains four different formulas for ...

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  14. A famous relation in physics relates 'moving mass' m to the 'rest mass...

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  15. The unit of length conventent on the atomic scale is known as an angs...

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  16. One mole of an ideal gas at standard temperature and pressure occupies...

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  17. Explain this common observation clearly: If you look out of the window...

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  18. The principle of 'parallax' in section 2.3.1 is used in the determinat...

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  19. The nearest star to our solar system is 4.29 light years away. How muc...

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  20. Precise measurements of physical quantities are a need of science. For...

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