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 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 frequency increases.
Because the amplitude is reduced.
Because the speed of light changes.
Because it interferes with the surface.
3. A Newtonian telescope has
a flat secondary mirror
just the primary mirror
a diverging 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?
Refraction
Dispersion
Interference
Diffraction
5. Diffraction gratings are used to
reduce diffraction of telescopes.
break up light into a spectrum.
detect infrared radiation.
increase the resolution of telescopes.
6. The speed of light in glass is
increased by approximately 50%
the same as in vacuum
reduced by approximately 60%
reduced by approximately 1%
7. Diffraction gratings are used for
detecting microwave radiation.
increasing the angular resolution of telescopes.
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?
Colour
Speed
Wavelength
Amplitude
9. Which of the following parameters is the same for all electromagnetic waves propagating in a vacuum?
Amplitude
Wavelength
Speed
Colour
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
just the primary mirror.
a correction plate.
a flat secondary mirror.
a diverging secondary 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 not be limited by the Earth’s horizon.
to be close to the stars.
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 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.
brightness of the light.
reflectivity of the prism.
photoelectric effect.
16. The focal length of an ideal mirror depends on
reflectivity of the prism.
brightness of the light.
wavelength of the light.
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 behaves like a wave and like a particle.
Light can be expressed as brightness and colour.
18. What is the angular size of the Moon?
0.5 degrees
5 degrees
0.5 arcminutes
0.5 arcseconds
19. Which of the following space-based telescopes detected water in the Orion nebula?
Chandra
Hubble
The International Space Observatory (ISO)
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 remains the same.
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 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?
160
less than 1
78
40
22. To detect dim objects a telescope needs
high magnification.
high resolution.
large diameter.
a long tube.
23. A Charge Coupled Device is used in telescopes to
compensate for sagging of the mirror.
improve light gathering.
reduce the effect of segmentation of mirrors.
detect light.
24. Hello
World
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