Soal dan Jawaban OSK Astronomi SMA 2013

Soal Olimpiade Sains Nasional Astronomi
Tingkat Kota/Kabupaten
tahun 2013
-- soal dan Jawaban OSK Astronomi SMA 2013 --

Soal Olimpiade Astronomi Tingkat Kabupaten/Kota Tahun 2013

1. A star is located at a distance of 5,1 parsec. 1 parsec is equal to 3,26 light years. One light year is the distance travelled by light in a year. If the light speed is 300.000 km/seconds, what is the distance of the star?

a. 1,7 x 1011 km
b. 1,5 x 1012 km
c. 1,6 x 1014 km
d. 1,1 x 1015 km
e. 1,3 x 1017 km

2. Number of leap years between 1 January 10000 BC until 31 December 2100 AD is

a. 3020
b. 2934
c. 3178
d. 2873
e. 2980

3. Venus achieves its half phase at

a. Superior conjunction
b. Inferior conjunction
c. Maximum West elongation and maximum East elongation
d. retrograde
e. Toward superior conjuntion

4. In December 2012, Voyager 2 Space Craft is at a distance if 15 billion km from the Earth or 100 times distances of Earth and Sun. Which law of Physics that explain why the space craft has travelled that distance?

a. Newton's law I about motion
b. Newton's law III abou motion
c. Bernouli's law about fluid mechanics
d. Kepler's law II about planetary motion
e. Thermodynamics law about the conservation energy

5. At the moment of mid penumbral lunar eclipse, phase of Moon is about

a. 180 degree
b. 90 degree
c. 0 degree
d. 270 degree
e. Any value between 0 to 360 degree

6. From the Earth, the full phase of Venus:

a. Can be observed at any time
b. Impossible to be observed
c. Can be observed if Venus has already been at the maximum East elongation
d. Can be observed if Venus has already been at the maximum West elongation
e. Sometimes can be observed as a bright celestial object

7. Which part of electromagnetic spectrum radiated by stars that can reach telescopes on the surface of the Earth?

a. Ultraviolet
b. Radio wave
c. Gamma ray
d. X-ray
e. Micro wave

8. Suppose that Potentially Hazardous Asteroids (PHAs) are uniformly distributed so that its relative collision rates are constant. If all of these asteroids will be vanished due to collision with the Earth within 25 million years from now, and there are 1364 PHAs known until now (data updated until 30 September 2012), what is the frequency between two collisions?

a. Once in 8.000 years
b. Once in 13.000 years
c. Once in 18.000 years
d. Once in 23.000 years
e. Once in 28.000 years

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