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