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