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
0.1 degree
50 degrees.
0.5 degree.
5 degrees.
3. Which of the following uses a grazing incidence telescope?
Chandra.
Hubble Space telescope.
Spitzer.
International Ultraviolet Explorer.
4. Modern observatories mostly use
refractive objectives.
observatories at low altitude.
photographic film.
CCD detectors.
5. LIGO is an acronym for:
Laser Incoming Ground Observation.
Light Incident Gravitational Observation.
Light Ingoing Ground Observations.
Laser Interferometric Gravitational-wave Observatory.
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.
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?
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
image neutrinos.
reduce the effect of light pollution in urban skies.
improve the resolution of objects.
remove the effect of Cerenkov radiation.
9. An electromagnetic wave having a wavelength of 550 nm is:
gamma radiation.
visible radiation.
ultra-violet radiation.
infrared 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.
intensity of the light.
brightness of the light.
wavelength of the light.
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