Exploring the Cosmos - Degree Exam 2009 - Mapping the Universe
1. Adaptive optics is a technique that reduces the effect of atmospheric turbulence by
evacuating the telescope tube.
varying the mirror reflectivity.
bending the telescope mirror.
adjusting the eyepiece position
2. The angular size of the Moon is
5 degrees.
50 degrees.
0.5 degree.
0.1 degree
3. Which of the following uses a grazing incidence telescope?
International Ultraviolet Explorer.
Hubble Space telescope.
Spitzer.
Chandra.
4. Modern observatories mostly use
observatories at low altitude.
photographic film.
CCD detectors.
refractive objectives.
5. LIGO is an acronym for:
Laser Incoming Ground Observation.
Light Incident Gravitational Observation.
Light Ingoing Ground Observations.
Laser Interferometric Gravitational-wave Observatory.
6. If the diameter of the objective of a telescope is doubled, what happens to its light gathering power? The light gathering power
remains the same.
is increased by a factor of four.
is increased by a factor of two.
is increased by a factor of three.
7. Which of the following processes is responsible for the absorption of Infra-Red radiation?
Infra-Red radiation is not absorbed.
Splitting of the atomic nuclei.
Excitation of vibrational modes of molecules.
Breaking of the chemical bonds.
8. Long Baseline Interferometry is a technique often used in radio astronomy to
improve the resolution of objects.
image neutrinos.
remove the effect of Cerenkov radiation.
reduce the effect of light pollution in urban skies.
9. An electromagnetic wave having a wavelength of 550 nm is:
ultra-violet radiation.
gamma radiation.
infrared radiation.
visible radiation.
10. In a diffraction grating the angle between the zero order (white fringe) and first order (coloured fringe) depends on the
speed of the light.
wavelength of the light.
intensity of the light.
brightness of the light.
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