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