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
evacuating the telescope tube.
varying the mirror reflectivity.
bending the telescope mirror.
2. The angular size of the Moon is
0.1 degree
5 degrees.
50 degrees.
0.5 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.
observatories at low altitude.
CCD detectors.
photographic film.
5. LIGO is an acronym for:
Light Ingoing Ground Observations.
Laser Interferometric Gravitational-wave Observatory.
Laser Incoming Ground Observation.
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 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.
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
reduce the effect of light pollution in urban skies.
image neutrinos.
improve the resolution of objects.
remove the effect of Cerenkov radiation.
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
wavelength of the light.
speed of the light.
intensity of the light.
brightness of the light.
Submit Quiz