Exploring the Cosmos - Degree Exam 2012 - Mapping the Universe
1. Which of the following statements is false?
Light travels faster in glass than in a vacuum.
Red light has a longer wavelength than blue light.
Light is both a wave and a particle.
Light is a wave of varying electric and magnetic fields.
2. A Schmidt-Cassegrain telescope uses which of the following components?
Only mirrors.
Both lenses and mirrors.
A diffraction grating.
Only lenses.
3. If a telescope has an objective with a focal length of 90 cm and an eyepiece with focal length of 3 cm, what is the magnification of the telescope?
1/30
60
270
30
4. What are the three important qualities of a telescope?
Magnification, Light Gathering Power, Resolving Power.
Magnification, Diffractive Power, Resolving Power.
Magnification, Diffractive Power, Light Gathering Power.
Diffractive Power, Light Gathering Power, Resolving Power.
5. What causes the twinkling of stars?
Impurities in the lens of the telescope or eye.
Atmospheric refraction.
Atmospheric Dispersion.
The variation in intensity of light emitted by the star.
6. On a cloudless day, why does the sky look blue?
Because the red light is absorbed by the atmosphere.
Because red light is scattered more than blue light.
Because the sky reflects the blue colour of the sea.
Because blue light is scattered more than red light.
7. Grazing incidence mirrors are used to focus light in what type of telescope?
X-Ray telescopes.
Radio telescopes.
Optical telescopes.
Infra-red telescopes.
8. By what method are radio telescopes able to obtain high-resolution images?
By using computer grinding to construct very smooth mirrors.
By using laser guide adaptive optics.
By having a large field of view.
By using the interference of signals from many radio telescopes.
9. Super-Kamiokande is an experiment designed to detect what?
Earth-like planets.
Neutrinos.
Gamma rays.
Gravitational waves.
10. The James Webb telescope is intended to replace what?
The Hubble Space telescope.
The Compton Gamma Ray observatory.
The Chandra observatory.
The Infra Red Astronomical Satellite.
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