SAO 2021, Писмен тур — Задача 16. P(A) Multiple Choice Questions

Singapore Astronomy Olympiad 2021 · 20 т.

Указания
  1. The entire Olympiad lasts for 3.5 hours and is worth a total of 200 marks.
  2. Fill in these details on the cover page (after the Contents page), the Summary Answer Sheet and each side of an SAO answer sheet:
    • Year of competition
    • Your participant code
    • The page number – which should be continuous from 1 to N
    • The part of the paper, and the question number
  3. Cross out all workings or answers you do not wish to be evaluated.
  4. You are allowed to leave the venue early upon submission of your answer script (see Instructions on Cover Page), but only after one hour after the start of the paper and not within 30 minutes to completion of the paper.
  5. Please raise your hand to seek assistance from the invigilators (e.g. to visit the restroom, request for more answer sheets, enquire about an ambiguity, etc.)
Competition Rules and Regulation
  1. Only the use of scientific calculators is permitted. No graphing or programmable calculators are allowed.
  2. Disruptive behaviour, cheating, collusion to cheat or any integrity-related offences are grounds for immediate disqualification.
  3. You may opt to retain the question paper and constants sheet for personal use. Return all unused answer sheets to the Organising Team.
References for Data Analysis Question
  1. MS Star Details are derived from: Zombeck, Martin V. (1990). Handbook of Space Astronomy and Astrophysics (2nd ed.). Cambridge University Press
  2. Additional MS Star Details are derived from: Vardavas, Ilias M.; et al. (2011), "Chapter 5. Incoming Solar Radiation" Radiation and Climate: Atmospheric Energy Budget from Satellite Remote Sensing.

Astronomy.SG would like to thank the organizing committee and the question setters. This document is typeset in LaTeX.

Cover Page
  1. Fill in all required details below, before time is up.
  2. Ensure that all materials (answer sheets, graphing paper, practical question paper) you intend to submit for grading have been attached. Amendments to any answer script after it has been collected will not be entertained.
  3. Details on each side of answer sheet:
    • Your participant code.
    • Question number.
    • Page number – continuous from 1 to N throughout your answer script.
    • DO NOT WRITE YOUR NAME ON YOUR ANSWER SCRIPT.
  4. Order of answer script:
    • Stack 1: i. This cover page.
      ii. Summary Answer Sheet iii. Answer sheets from Part 1 to 3, in continuous order from page 1 to M.
    • Stack 2: i. Answer sheets for Part 4, in continuous order from M to N.
      ii. Graph(s) from Part 4.
    • Stack 3: i. Practical cover page.
      ii. Practical Component from Part 5.
1 Section A [12]

Write all your responses in the summary answer sheet provided.

Section B(1): Short Questions [36]

This section contains a total of 5 short-length questions worth 9 marks each.
You are to choose 4 to do.

Section B(2): Medium Questions [18]

This section contains a total of 2 medium-length questions worth 18 marks each.
You are to choose 1 to do.

Practical Cover Page

INSTRUCTIONS TO PARTICIPANTS:

  1. Fill in all required details below, before time is up.
  2. You are to detach this page and all subsequent pages as part of your response.
  3. All detached pages are to be re-stapled and be part of your 3rd stack of your answer script.
  4. All responses to this section of the paper are to be written on the question paper itself, in the spaces provided.
  5. There will be a star chart provided as part of the question. Responses to the corresponding questions in that section are to be answered on the star chart itself.
  6. All final responses shall be written legibly and unambiguously.
  7. Details on each page:
    • Your participant code.
    • DO NOT WRITE YOUR NAME ON YOUR ANSWER SCRIPT.
Section A

Each question is worth 2 marks.

Summary of answers:

Q1Q2Q3Q4Q5Q6
DCACBB

Условие

Attempt ALL questions in this section. Indicate the selected options clearly on the bottom of the page.

1. The Winter Hexagon is a large asterism consisting of 6 stars spanning 6 different constellations. The hexagon is large enough to encircle half of another constellation within it. Which constellation has been encircled in the hexagon?

A. Gemini

B. Cancer

C. Monoceros

D. Hydra [2 т.]

2. Which of the following is not an asterism?

A. Little Dipper

B. Big Dipper

C. Spring Triangle

D. The Sickle [2 т.]

3. How many of the 88 IAU Constellations have its IAU abbreviation the same as its name?

A. 1

B. 2

C. 3

D. 4 [2 т.]

4. You want to start a tradition of stargazing during the nights of one of the holidays. Which festive occasion do you pick to avoid a full moon?

A. Mid-Autumn Festival

B. Vesak Day

C. Christmas

D. Hari Raya Aidilfitri (Eid al-Fitr) [2 т.]

5. Based on observations, the Sun is now in the constellation of Taurus. 2 months ago, on March 29, which constellation would the Sun be in?

A. Pisces

B. Aries

C. Taurus

D. Aquarius [2 т.]

6. Jun Rui has pointed his refractor towards the Moon. However, he notices that at the rim of the Moon there is some splitting of colour resulting in a mini rainbow effect. What can he do to alleviate this problem?

A. Add a wide-field Barlow lens.

B. Check the alignment of the secondary mirror.

C. Use an apochromat lens with a low-dispersion glass.

D. Use a Coma corrector. [2 т.]

7. How many of the following statements are TRUE?

I Stars with the same RA rises/set at the same time.

II Observers with latitude that is north of 23.5°N will never see the Sun at the Zenith.

III The ecliptic intersects the celestial equator at the cardinal East and West points on the horizon.

IV There are places on Earth which only experience one high tide and one low tide in a day instead of the usual 2 high and 2 low tides.

A. 1

B. 2

C. 3

D. 4 [2 т.]

8. Read the following excerpt to identify the constellation it has made reference to.

“This constellation represented the hair of an Egyptian Queen, who vowed to sacrifice her beautiful hair should her husband returned safely from the 3rd Syrian War. Till today, this modern constellation remains as the only one named after an actual historical person.”

A. Cassiopeia

B. Coma Berenices

C. Carina

D. Andromeda [2 т.]

1.2.3.4.
5.6.7.8.

9. Put a tick in the box beside the statements which are TRUE

You can see Ursa Minor from Antarctica.
To deem if an object can be more easily spotted as compared to another, one should only compare the objects’ apparent magnitude and declination.
To improve the Signal-to-Noise Ratio (SNR) of any photo, you should choose increasing the number of shots taken over increasing the exposure time, assuming the total exposure time is kept constant.
For the best tracking of celestial objects, one should perform a Drift Alignment over visual alignment to Polaris.

[2 т.]

10. Sid wants to set up his German Equatorial Mount. After going through NS, he has forgotten the correct steps. He lists down the steps he needs to take but has forgotten the order. Write the correct order, numbering each step from (1) to (8) in the boxes beside the steps.

Fix on the counterweight bar and counterweights.
Set up the tripod, remembering to level it.
Fix the mount onto the tripod. Aligning the tripod and the mount to the North Celestial Pole.
Find a place with flat ground and with no blockages overhead.
Fix on the main body of the telescope.
Balance the RA axis.
Balance the Dec axis.
Attach the required accessories like the eyepieces and finder scope.

[2 т.]

Отговори

Решение

Оригинал в Архива: SAO 2021 Question Paper.pdf · официални решения: SAO 2021 Compiled Solutions.pdf