Astronomy Quiz 05

Using ___________, scientists can use a few smaller telescopes to take images with the same resolution as a much larger telescope.

• Satellite telescopes

• Charge-coupled devices (CCDs)

• Interferometry

• Adaptive optics

One of the biggest problems for ground based astronomy today is

• All the best mountains already have telescopes on them.

• Atmospheric pollution has significantly worsened the seeing.

• Space-based observatories are making most of the observations.

• Light pollution makes it difficult to observe faint objects.

The two most important properties of any telescope are

• The light gathering power and the length of the tube

• The length of the tube and the magnification

• The magnification and the light gathering power

• The resolving power and the magnification

• The light gathering power and the resolving power

A pencil inside a water glass appears to be bent because of

• Reflection of light

• Refraction of light

• Change in gravity

• None of the above

What is a disadvantage of using a lens in a large telescope?

• Large lenses are expensive to fabricate

• A lens has to be supported only at its edges, so the lens can sag in the middle

• Different colors of white light on passing through a lens focus at different points and result in a blurred image

• Some lens materials completely absorb short wavelengths

• All of the above

The ability of a telescope to show two very close objects separately is called its ________.

• Light gathering power

• Resolving power

• Magnification

• None of the above

Carl has a 5-inch refracting telescope and Jim has a 3-inch reflecting telescope. Whose telescope has a higher light-gathering power?

• Carl's, because lenses gather more light

• Jim's, because mirrors gather more light

• Carl's, because the larger the diameter, the more light to be collected

• Jim's, because the smaller the diameter, the more light to be collected

• Both the telescopes have the ability to gather the same amount of light

Tom has a 4-inch refracting telescope and Steve has a 3-inch reflecting telescope. Whose telescope has a higher resolving power?

• Tom's, because lenses are more efficient in showing the objects separately

• Tom's, because lenses are more efficient in showing the objects separately

• Tom's, because the larger the diameter, the better the resolution

• Steve's, because the smaller the diameter, the better the resolution

• Both the telescopes have the same resolving power

The best site for placing an X-ray telescope is _________.

• A mountain top

• A valley

• Near an ocean

• A desert

• Outside the Earth's atmosphere

Which is the most efficient detector?

• Photographic films

• Photomultiplier tubes

• Charge-coupled device (CCD)

• Your eyes