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