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