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