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 a short time.
The wavelength is the distance between two consecutive peaks.
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 amplitude is reduced.
Because the speed of light changes.
Because the frequency increases.
Because it interferes with the surface.
3. A Newtonian telescope has
just the primary mirror
a diverging secondary mirror
a flat secondary 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?
Dispersion
Refraction
Interference
Diffraction
5. Diffraction gratings are used to
break up light into a spectrum.
increase the resolution of telescopes.
reduce diffraction of telescopes.
detect infrared radiation.
6. The speed of light in glass is
reduced by approximately 60%
the same as in vacuum
reduced by approximately 1%
increased by approximately 50%
7. Diffraction gratings are used for
reducing the diffraction of telescopes.
detecting microwave radiation.
analysing the light spectrum.
increasing the angular resolution of telescopes.
8. Which of the following parameters is the same for all electromagnetic waves propagating in a vacuum?
Amplitude
Speed
Wavelength
Colour
9. Which of the following parameters is the same for all electromagnetic waves propagating in a vacuum?
Amplitude
Speed
Wavelength
Colour
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 flat secondary mirror.
a correction plate.
a diverging secondary mirror.
just the primary mirror.
12. The Hubble telescope was placed in space in order
to improve the magnification.
to not be limited by the Earth’s atmosphere.
to be close to the stars.
to not be limited by the Earth’s horizon.
13. An electromagnetic wave with a wavelength of 600 nm is
visible radiation.
ultraviolet radiation.
infrared radiation.
microwave radiation.
14. Which of the following uses a grazing incidence telescope?
International Ultraviolet Explorer.
International Space Station.
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
photoelectric effect.
reflectivity of the prism.
wavelength of the light.
brightness of the light.
16. The focal length of an ideal mirror depends on
reflectivity of the prism.
brightness of the light.
photoelectric effect.
wavelength of the light.
17. Light can be described as having a “dual†nature. What does this mean?
Light can be expressed as brightness and colour.
Light goes slow and fast.
Light behaves like a wave and like a particle.
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 degrees
0.5 arcseconds
0.5 arcminutes
5 degrees
19. Which of the following space-based telescopes detected water in the Orion nebula?
The International Space Observatory (ISO)
Hubble
The International Ultraviolet Explorer (IUE)
Chandra
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 is decreased by a factor of four.
The light gathering power remains the same.
The light gathering power increased 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
high magnification.
large diameter.
a long tube.
high resolution.
23. A Charge Coupled Device is used in telescopes to
reduce the effect of segmentation of mirrors.
compensate for sagging of the mirror.
detect light.
improve light gathering.
24. Hello
World
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