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