Exploring the Cosmos - Degree Exam 2009 - Mapping the Universe
1. Adaptive optics is a technique that reduces the effect of atmospheric turbulence by
bending the telescope mirror.
varying the mirror reflectivity.
evacuating the telescope tube.
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
refractive objectives.
observatories at low altitude.
CCD detectors.
photographic film.
5. LIGO is an acronym for:
Laser Incoming Ground Observation.
Light Incident Gravitational Observation.
Laser Interferometric Gravitational-wave Observatory.
Light Ingoing Ground Observations.
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 three.
is increased by a factor of four.
remains the same.
is increased by a factor of two.
7. Which of the following processes is responsible for the absorption of Infra-Red radiation?
Splitting of the atomic nuclei.
Excitation of vibrational modes of molecules.
Breaking of the chemical bonds.
Infra-Red radiation is not absorbed.
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.
infrared radiation.
visible radiation.
gamma radiation.
10. In a diffraction grating the angle between the zero order (white fringe) and first order (coloured fringe) depends on the
intensity of the light.
wavelength of the light.
speed of the light.
brightness of the light.
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