Astro 2022

Which one of the following designs of telescope has a flat secondary mirror?

• Cassegrain reflector
• Galilean refractor
• Keplerian refractor
• Newtonian reflector

Which one of the following designs of telescope has a hole in the centre of its objective?

• Cassegrain reflector
• Galilean refractor
• Keplerian refractor
• Newtonian reflector

Which one of the following designs of telescope uses a concave (diverging) eyepiece?

• Cassegrain reflector
• Galilean refractor
• Keplerian refractor
• Newtonian reflector

When observing from the Earth's Equator:

• all stars are below the horizon
• all stars are circumpolar
• all stars rise and set
• all stars with a declination greater than 231⁄2° are circumpolar

Which one of the following is not a suitable safe method of observing the Sun?

• averted vision
• H-alpha filter
• pinhole camera
• telescopic projection

A lunar eclipse can occur at which of these phases?

• First Quarter
• Full
• Last Quarter
• New

If the mass of the Sun and the distance between the Earth and the Sun were both doubled, the gravitational force between them would:

• increase by four times
• double
• stay the same
• halve

Which of the following is a correct list of the Sun's features, in order from hottest to coldest?

• chromosphere, photosphere, corona, sunspot
• corona, chromosphere, photosphere, sunspot
• corona, photosphere, chromosphere, sunspot
• photosphere, corona, sunspot, chromosphere

Which statement is correct about a refracting telescope?

• The telescope uses a single curved mirror to form an image.
• The telescope uses a series of flat and curved mirrors to form an image.
• The telescope uses a series of lenses to form an image.
• The telescope uses lenses and mirrors to form an image.

What is the definition of the celestial equator?

• The line of places that receive equal lengths of day and night on every day of the year
• The line of places that are half way between the North and South Poles
• The projection onto space of the Earth's equator
• The line in space where the Sun is on the meridian every day