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 a trough and a peak.
The wavelength is the distance between two consecutive peaks.
The wavelength is the distance travelled by the wave in 1 second.
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 it interferes with the surface.
Because the amplitude is reduced.
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?
Refraction
Interference
Dispersion
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
the same as in vacuum
reduced by approximately 60%
increased by approximately 50%
reduced by approximately 1%
7. Diffraction gratings are used for
detecting microwave radiation.
analysing the light spectrum.
reducing the diffraction of telescopes.
increasing the angular resolution of telescopes.
8. Which of the following parameters is the same for all electromagnetic waves propagating in a vacuum?
Wavelength
Colour
Speed
Amplitude
9. Which of the following parameters is the same for all electromagnetic waves propagating in a vacuum?
Amplitude
Speed
Colour
Wavelength
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 it interferes with the surface.
Because the speed of light changes.
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 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
infrared radiation.
microwave radiation.
ultraviolet radiation.
visible radiation.
14. Which of the following uses a grazing incidence telescope?
International Ultraviolet Explorer.
Chandra X-ray satellite.
International Space Station.
International Space Observatory.
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.
photoelectric effect.
brightness of the light.
wavelength of the light.
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?
5 degrees
0.5 degrees
0.5 arcminutes
0.5 arcseconds
19. Which of the following space-based telescopes detected water in the Orion nebula?
Hubble
The International Ultraviolet Explorer (IUE)
The International Space Observatory (ISO)
Chandra
20. If the width of the objective of a telescope is doubled, what happens to its light gathering power?
The light gathering power remains the same.
The light gathering power is decreased by a factor of four.
The light gathering power increased by a factor of four.
The light gathering power is increased by a factor of two.
21. For a telescope the objective focal length is 80 cm and the eyepiece focal length is 2 cm, what is the magnification?
78
160
40
less than 1
22. To detect dim objects a telescope needs
high resolution.
a long tube.
high magnification.
large diameter.
23. A Charge Coupled Device is used in telescopes to
improve light gathering.
compensate for sagging of the mirror.
reduce the effect of segmentation of mirrors.
detect light.
24. Hello
World
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