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.
Light is both a wave and a particle.
Red light has a longer wavelength than blue light.
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.
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?
1/30
30
270
60
4. What are the three important qualities of a telescope?
Magnification, Diffractive Power, Resolving Power.
Magnification, Diffractive Power, Light Gathering Power.
Diffractive Power, Light Gathering Power, Resolving Power.
Magnification, Light Gathering Power, Resolving Power.
5. What causes the twinkling of stars?
Impurities in the lens of the telescope or eye.
The variation in intensity of light emitted by the star.
Atmospheric Dispersion.
Atmospheric refraction.
6. On a cloudless day, why does the sky look blue?
Because the sky reflects the blue colour of the sea.
Because red light is scattered more than blue light.
Because blue light is scattered more than red light.
Because the red light is absorbed by the atmosphere.
7. Grazing incidence mirrors are used to focus light in what type of telescope?
Infra-red telescopes.
X-Ray telescopes.
Optical telescopes.
Radio telescopes.
8. By what method are radio telescopes able to obtain high-resolution images?
By using the interference of signals from many radio telescopes.
By using laser guide adaptive optics.
By having a large field of view.
By using computer grinding to construct very smooth mirrors.
9. Super-Kamiokande is an experiment designed to detect what?
Gamma rays.
Neutrinos.
Earth-like planets.
Gravitational waves.
10. The James Webb telescope is intended to replace what?
The Chandra observatory.
The Compton Gamma Ray observatory.
The Infra Red Astronomical Satellite.
The Hubble Space telescope.
Submit Quiz