Exploring the Cosmos - Class Test 1 - Mapping the Universe
1. Which of the following statements correctly describes the wavelength of an electromagnetic wave?
The wavelength is the distance between a trough and a peak.
The wavelength is the distance travelled by the wave in a short time.
The wavelength is the distance travelled by the wave in 1 second.
The wavelength is the distance between two consecutive peaks.
2. Why does a light ray bend when it crosses the boundary between two different media at an oblique angle?
Because the speed of light changes.
Because it interferes with the surface.
Because the amplitude is reduced.
Because the frequency increases.
3. A Newtonian telescope has
a diverging secondary mirror
a flat secondary mirror
just the primary mirror
a correction plate
4. As light passes from one medium to another, its direction of travel changes. What is the name of this effect?
Interference
Diffraction
Dispersion
Refraction
5. Diffraction gratings are used to
reduce diffraction of telescopes.
increase the resolution of telescopes.
detect infrared radiation.
break up light into a spectrum.
6. The speed of light in glass is
reduced by approximately 1%
the same as in vacuum
increased by approximately 50%
reduced by approximately 60%
7. Diffraction gratings are used for
analysing the light spectrum.
increasing the angular resolution of telescopes.
reducing the diffraction of telescopes.
detecting microwave radiation.
8. Which of the following parameters is the same for all electromagnetic waves propagating in a vacuum?
Speed
Amplitude
Wavelength
Colour
9. Which of the following parameters is the same for all electromagnetic waves propagating in a vacuum?
Wavelength
Colour
Amplitude
Speed
10. Why does a light ray bend when it crosses the boundary between two different media at an oblique angle?
Because the frequency increases.
Because it interferes with the surface.
Because the speed of light changes.
Because the amplitude is reduced.
11. A Newtonian telescope has
a diverging secondary mirror.
just the primary mirror.
a correction plate.
a flat secondary mirror.
12. The Hubble telescope was placed in space in order
to not be limited by the Earth’s atmosphere.
to not be limited by the Earth’s horizon.
to improve the magnification.
to be close to the stars.
13. An electromagnetic wave with a wavelength of 600 nm is
ultraviolet radiation.
microwave radiation.
infrared radiation.
visible radiation.
14. Which of the following uses a grazing incidence telescope?
International Space Station.
International Ultraviolet Explorer.
Chandra X-ray satellite.
International Space Observatory.
15. The angle through which a ray of light is bent by a glass prism depends on the
reflectivity of the prism.
brightness of the light.
wavelength of the light.
photoelectric effect.
16. The focal length of an ideal mirror depends on
brightness of the light.
photoelectric effect.
wavelength of the light.
reflectivity of the prism.
17. Light can be described as having a “dual†nature. What does this mean?
If light moves in one direction, then it moves in the opposite direction also.
Light behaves like a wave and like a particle.
Light goes slow and fast.
Light can be expressed as brightness and colour.
18. What is the angular size of the Moon?
0.5 degrees
0.5 arcminutes
5 degrees
0.5 arcseconds
19. Which of the following space-based telescopes detected water in the Orion nebula?
Hubble
The International Space Observatory (ISO)
Chandra
The International Ultraviolet Explorer (IUE)
20. If the width 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 two.
The light gathering power increased by a factor of four.
The light gathering power remains the same.
The light gathering power is decreased by a factor of four.
21. For a telescope the objective focal length is 80 cm and the eyepiece focal length is 2 cm, what is the magnification?
40
less than 1
78
160
22. To detect dim objects a telescope needs
a long tube.
high resolution.
large diameter.
high magnification.
23. A Charge Coupled Device is used in telescopes to
improve light gathering.
reduce the effect of segmentation of mirrors.
detect light.
compensate for sagging of the mirror.
24. Hello
World
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