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 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.
2. A Schmidt-Cassegrain telescope uses which of the following components?
Both lenses and mirrors.
Only mirrors.
Only lenses.
A diffraction grating.
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
270
60
4. What are the three important qualities of a telescope?
Diffractive Power, Light Gathering Power, Resolving Power.
Magnification, Light Gathering Power, Resolving Power.
Magnification, Diffractive Power, Resolving Power.
Magnification, Diffractive Power, Light Gathering Power.
5. What causes the twinkling of stars?
Atmospheric Dispersion.
The variation in intensity of light emitted by the star.
Atmospheric refraction.
Impurities in the lens of the telescope or eye.
6. On a cloudless day, why does the sky look blue?
Because the red light is absorbed by the atmosphere.
Because blue light is scattered more than red light.
Because red light is scattered more than blue 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?
Optical telescopes.
Radio telescopes.
Infra-red telescopes.
X-Ray telescopes.
8. By what method are radio telescopes able to obtain high-resolution images?
By using laser guide adaptive optics.
By having a large field of view.
By using the interference of signals from many radio telescopes.
By using computer grinding to construct very smooth mirrors.
9. Super-Kamiokande is an experiment designed to detect what?
Earth-like planets.
Gamma rays.
Neutrinos.
Gravitational waves.
10. The James Webb telescope is intended to replace what?
The Compton Gamma Ray observatory.
The Hubble Space telescope.
The Infra Red Astronomical Satellite.
The Chandra observatory.
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