Observational Astronomy MCQs with Answers

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Observational Astronomy Online Quiz

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• Test Name: Observational Astronomy MCQ Quiz Practice
• Type: Quiz Test
• Total Questions: 40
• Total Marks: 40
• Time: 40 minutes

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Observational Astronomy

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1 / 40

What is a spectrometer used for in astronomy?

To analyze the light spectrum from celestial objects

To measure the distance to stars

To detect gravitational waves

2 / 40

What is the apparent magnitude of a star?

The brightness of a star as seen from Earth

The size of a star

The actual brightness of a star

3 / 40

What is a binary star system?

A single star with two planets

A star that splits into two

A system where two stars orbit around their common center of mass

4 / 40

What is the function of a radio telescope?

To measure the distance to planets

To observe visible light from stars

To detect and collect radio waves from space

5 / 40

What is the absolute magnitude of a star?

The brightness of a star as seen from Earth

The actual brightness of a star if it were at a standard distance of 10 parsecs from Earth

The size of a star

6 / 40

What is the name of the telescope launched by NASA to study exoplanets using the transit method?

Kepler

Chandra

Hubble

7 / 40

What is the event horizon of a black hole?

The disk of material around a black hole

The boundary beyond which nothing can escape from a black hole

The center of a black hole

8 / 40

What is interferometry?

A way to measure the brightness of stars

A method for cooling telescopes

A technique that combines the signals from multiple telescopes to achieve higher resolution

9 / 40

What is a type II supernova?

A supernova that occurs in very old stars

A supernova that results from the rapid collapse and violent explosion of a massive star

A type of nova occurring in binary systems

10 / 40

What is the term for a meteoroid that reaches Earth's surface without burning up completely?

Meteoroid

Meteor

Meteorite

11 / 40

What is the purpose of an observatory dome?

To store astronomical data

To protect telescopes from the elements and reduce temperature fluctuations

To provide living quarters for astronomers

12 / 40

What is a light pollution?

The scattering of light by the atmosphere

The natural dimming of celestial objects

The brightening of the night sky caused by street lights and other man-made sources, which interferes with astronomical observations

13 / 40

What is the Hertzsprung-Russell diagram?

A map of the distribution of galaxies

A chart showing the positions of planets

A graph that plots stars according to their luminosity and temperature

14 / 40

What is the purpose of a star chart?

To map the positions of stars and constellations in the sky

To calculate the distance to stars

To measure the brightness of stars

15 / 40

What is redshift?

The splitting of light into its component colors

The increase in wavelength of light from an object moving away from the observer

The decrease in wavelength of light from an object moving toward the observer

16 / 40

What is the electromagnetic spectrum?

The spectrum of light emitted by stars

The range of all types of electromagnetic radiation

The range of visible light

17 / 40

What is the Doppler effect in astronomy?

The change in frequency or wavelength of light from an object moving toward or away from the observer

The bending of light by gravity

The spreading of light through a prism

18 / 40

What is the Hubble Space Telescope?

A space telescope that observes in visible, ultraviolet, and near-infrared spectra

A ground-based telescope

A radio telescope

19 / 40

What is the purpose of the Gaia mission?

To explore the surface of Mars

To study the outer planets

To create a precise 3D map of the stars in our galaxy

20 / 40

What is the largest type of optical telescope?

Refracting telescope

Radio telescope

Reflecting telescope

21 / 40

What is the zodiacal light?

A faint, diffuse, triangular glow visible in the night sky, caused by sunlight scattering off interplanetary dust

The light from the zodiac constellations

The glow from distant galaxies

22 / 40

What is a type Ia supernova?

A type of nova occurring in young stars

A type of supernova that occurs in binary systems where one star is a white dwarf

A supernova that results from the collapse of a massive star

23 / 40

What is the primary advantage of space telescopes over ground-based telescopes?

They are easier to maintain

They are above the Earth's atmosphere, which distorts and absorbs certain wavelengths of light

They are closer to the stars

24 / 40

What is the term for the sudden, bright streak of light caused by a meteoroid entering Earth's atmosphere?

Meteor

Meteorite

Meteoroid

25 / 40

What is a nova?

A sudden, dramatic increase in brightness of a star

A star that is forming

A galaxy that is forming

26 / 40

What is adaptive optics?

A method for cooling telescopes

A system for tracking stars

A technology that adjusts the telescope's mirror to compensate for atmospheric distortion

27 / 40

What is a light curve used to study?

The distribution of light in the sky

The spectrum of light from a star

Variability in the brightness of celestial objects over time

28 / 40

What is the term for a small, icy body that, when passing close to the Sun, displays a visible coma (a thin, fuzzy, temporary atmosphere) and sometimes a tail?

Meteor

Asteroid

Comet

29 / 40

What is the purpose of the event horizon telescope (EHT)?

To measure the distance to nearby stars

To image black holes

To observe gamma-ray bursts

30 / 40

What is a light-year?

The distance light travels in one year

The distance between the Earth and the Sun

The time it takes for light to travel from the Sun to Earth

31 / 40

What is blueshift?

The spreading of light through a prism

The decrease in wavelength of light from an object moving toward the observer

The increase in wavelength of light from an object moving away from the observer

32 / 40

What is the primary purpose of a telescope?

To measure distances

To navigate at sea

To collect and magnify light

33 / 40

What is parallax in astronomy?

The bending of light by gravity

The spreading of light through a prism

The apparent shift in position of a nearby star against the background of distant objects as seen from different points in Earth's orbit

34 / 40

What is a refracting telescope?

A telescope that uses mirrors to focus light

A telescope that uses lenses to focus light

A telescope that detects radio waves

35 / 40

What is a photometer?

An instrument that measures the intensity of light

An instrument that detects radio waves

An instrument that measures the distance to stars

36 / 40

What is an astronomical unit (AU)?

The distance light travels in one year

The average distance between the Earth and the Sun

The diameter of the Earth

37 / 40

What is a reflecting telescope?

A telescope that uses mirrors to focus light

A telescope that uses lenses to focus light

A telescope that detects radio waves

38 / 40

What is the term for a small, rocky body orbiting the Sun?

Meteor

Asteroid

Comet

39 / 40

What is a light curve in astronomy?

A spectrum of light from a star

A graph of light intensity of a celestial object over time

A map of the distribution of light in the sky

40 / 40

What is the Messier catalog?

A list of exoplanets

A catalog of stars in our galaxy

A list of 110 astronomical objects, including star clusters, nebulae, and galaxies, compiled by Charles Messier

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