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