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