Simple Conversion OF Units For Medical Students

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>SIMPLE CONVERSION TYPE OF UNITS.

1. How many light years are there in 1 metre ?

Ans. 1.057 x 10‐¹⁶ ly

2.The radius of gold nucleus is 41.3 fermi. Express its volume in m3.

Ans. 2.95 x 10‐⁴⁰ m

3. How much  metric  longer  than  a microsecond is a millisecond .

Ans. 10³

4. The density of wood is 0.5 g/cc What is its value in SI.

Ans. 500kg/m³

5. Calculate surface area of a solid cylinder of diameter 4 cm and height 20 cm in mm².

Ans. 27657.1 mm²

6. Express an acceleration of 10 ms‐²in km h‐²

Ans. 1.296 x 10⁵ kmh‐²

7. Find the value of one light year in giga metre.

Ans. 9.46 x 10⁶ Gm

8. How much longer is a par sec from a light year ?

Ans. 3.26 times

9. Estimate the order of magnitude of surface area of earth.

Ans. 15


10. Estimate the order of number of seconds in a century.

Ans.  9

11. When planet Jupiter is at a distance of 824.7 million km from earth, its angular diameter is measured to be 35.72" of arc. Calculate the diameter of jupiter.

Ans. 1-428 x 103 km.

12. A star is located 9 ly away from us. What is its distance in par sec ? What is the parallax shown by this star when viewed from two locations 3x 10¹¹ m apart. Given l par sec.
= 3.084x 10¹⁶ m, and 1 ly = 9.46 x 101⁵ m.

Ans. 2.76 par sec; 0.73"

13. When the observations are taken at an interval of 6 months, the angle of parallax for a star is 0.4". Find the distance of star in par sec.

Ans. 5.02 par sec


14. A drop of olive oil of radius 0.25 mm spreads into a circular film of diameter 20 cm on the water surface. Estimate the size of the molecule.

Ans. 2.08 x 10⁹ m

15. The shadow of a pole standing on a level ground is found to be 45 m longer when the sun's altitude is 30° than when it was 60°. Determine the height of the pole.

Ans. 38.92 m

16. Find the period of revolution of planet Mars
about the sun if mean distance of the Mars from
the sun is 1.52 AU

Ans. 1.87 year.

17. A drop of olive oil of radius 0.3 mm spreads into a rectangular film of 30 cmx 15 cm on the water surface. Calculate the size of the oil molecule.

Ans. 2.51 x 10⁹ m

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