Exploring the Cosmos - Degree Exam 2011 - Mapping the Universe
1. Which of the following is a true statement?
Light is neither a wave nor a particle.
Light is a wave, but not a particle.
Light is a particle, but not a wave.
Light is both a wave and a particle.
2. Which of the following describes waves whose wavelength is approximately 1 mm?
X-Rays.
Radio waves.
Visible red light.
Microwaves.
3. What is the phenomenon where the velocity of light in a medium depends on its wavelength?
Diffraction
Dispersion
Refraction
Interference
4. Newton's telescope was a
reflecting telescope.
Cassegrain telescope.
prime focus telescope.
refracting telescope.
5. Modern telescopes use CCDs to capture the light. What does the acronym CCD stand for?
Count Collecting Device.
Charge Coupled Diode.
Charge Collecting Diode.
Charge Coupled Device.
6. Ultra-Violet (UV) radiation is emitted by objects of temperature around
1 000 000 K
500 K
10,000 K
10 K
7. The Chandra Observatory is an observatory for
Infra-red astronomy.
Neutrino astronomy.
X-Ray astronomy.
Radio astronomy.
8. Why can X-Rays penetrate inside solids?
They have very small wavelengths.
They are out of phase with ordinary matter.
They are very non-reactive.
They are of very small frequency.
9. Why are neutrinos so hard to detect in astronomical observatories?
The neutrinos interact only weakly.
The neutrinos decay before reaching the Earth.
There are no astronomical sources of neutrinos.
Neutrinos are absorbed in the upper atmosphere.
10. Which of the following is NOT a good source of gravitational waves?
Pulsars.
Magellanic clouds.
Black Hole binary systems.
Supernova explosions.
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