geosocindia.org Earth Science Olympiad Astronomy Sample Question Paper : Geological Society of India

Name of the Organisation : Geological Society of India
Name of the paper : 7th Earth Science Olympiad
Year : 2017
Website : http://www.geosocindia.org/index.php/ieso/index
Download Sample Question Paper:
Astronomy – Practical : https://www.pdfquestion.in/uploads/22950-Astro-prac.pdf
Astronomy – Theory : https://www.pdfquestion.in/uploads/22950-Astro-theo.pdf
Astronomy – Theory – Table :  https://www.pdfquestion.in/uploads/22950-Astro-theo-table.pdf

Geological Society Earth Science Astronomy Paper

** For the first stage Entrance Test, a modest fee of Rs. 50/- will be charged and no TA/DA provided. Free boarding, accommodation and travelling allowance as per norms will be provided to students selected for the Training Camp. No fee would be charged for subsequent stages.

Related : Geological Society of India Earth Science Olympiad Entrance Test 2016 : www.pdfquestion.in/8159.html

Instructions

1. Please write your student code on the cover page as well as on the top right of every page of answer sheet / calculations sheets.

2. Please write your answers legibly. Illegible answers will be counted as incorrect.
3. Please write your final answers in appropriate boxes in the main answer sheet. For numerical questions, show the calculations on blank calculation sheets provided.

4. For numerical questions, you may attempt part of the answer even if you don’t know the final result. There will be stepwise marking.
5. You can get as many calculations sheets as you want. Just raise your hand to ask for extra sheets. The volunteers will bring extra sheets to your table.

6. Write question number clearly at the top of the calculations sheet.
7. Read the entire question group carefully before starting to answer. Each question has a point value assigned and indicated on the right hand side of the question.
8. Any inappropriate examination behaviour will result in your withdrawal from the IESO.

Astronomy Sample Questions

Time: 45 Minutes
Maximum Marks: 28.5
A1. We list a few facts below about temperatures at the surface of Venus, Earth and Mars.
(a) The yearly mean temperatures of planets do not match with their expected black body temperature.
(b) Absolute variation in the temperature during the course of one day differs significantly from one planet to another.

(c) Absolute variation in the temperature during the course of one year at the equator of the planet differs significantly from one planet to another.
(d) On some planets, there is a large latitudinal percentage variation in temperatures.
(e) Mean temperature (averaged over a day) on Earth is different on different days.

In the table given in your answer sheet, we list a number of physical properties related to a planet and its various motions, which may or may not be relevant in explaining the facts above. In the table, tick in appropriate rows those properties which are relevant for each of the facts above. Number of relevant parameters for each row can be none, one or more than one. Total 10 points for correct tick-marks.
Warning: Every wrong tick mark has penalty of -0.2 points.

A2. The maximum altitude of the Sun as seen from Mysore on summer solstice day and winter solstice day are 78o 51′ and 54o 17′ respectively. Using this information, obtain the inclination of the Earth’s axis (e) and find the latitude of Mysore (f). (6 points)

A3. The mass ratio of Pluto and Charon is 8:1. The period of revolution of Charon around Pluto is about 6.387 days. You are given that MPluto = 1.31 x 1022 kg, RPluto = 1195 km, G = 6.672 x 10-11 N m2 kg-2 the Minimum and maximum distance of Pluto from Earth are 4284.7 x 106 km and 7528 x 106 km respectively.
(a) Find the length of the semi-major axis of Charon’s orbit of revolution about Pluto. (3 points)

(b) Find the ratio a:RPluto, where ‘a’ is the distance of the Centre of Mass of the Pluto-Charon system from the center of Pluto . (2 points)
(c) Theoretically, what is the minimum diameter of the optical telescope which can resolve the system from Earth? Ignore effects of Earth’s atmosphere.(2 points)

A4. The diagram on the next page shows the Hertzprung-Russell diagram (H-R diagram) with six positions (A – F) indicated. The y-axis is given in terms of Solar Luminosity (L?) and x-axis gives effective surface temperature (T) of stars in Kelvin.
(a) Which letters indicate the position of stars that have the largest and the smallest diameters respectively? (2 points)

(b) Which letters indicate the stars with the same spectral class but with different luminosities? (1 points)
(c) Which letters indicate the stars that are primarily burning Hydrogen? (1.5 points)
(d) Which letter would indicate position of a white dwarf in this diagram? (1 point)