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