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 1 second.
The wavelength is the distance travelled by the wave in a short time.
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 it interferes with the surface.
Because the speed of light changes.
Because the frequency increases.
3. A Newtonian telescope has
just the primary mirror
a correction plate
a flat secondary mirror
a diverging secondary mirror
4. As light passes from one medium to another, its direction of travel changes. What is the name of this effect?
Refraction
Diffraction
Interference
Dispersion
5. Diffraction gratings are used to
detect infrared radiation.
reduce diffraction of telescopes.
increase the resolution of telescopes.
break up light into a spectrum.
6. The speed of light in glass is
reduced by approximately 1%
reduced by approximately 60%
increased by approximately 50%
the same as in vacuum
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
Amplitude
Speed
Colour
9. Which of the following parameters is the same for all electromagnetic waves propagating in a vacuum?
Colour
Wavelength
Amplitude
Speed
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
just the primary mirror.
a flat secondary mirror.
a diverging secondary mirror.
a correction plate.
12. The Hubble telescope was placed in space in order
to not be limited by the Earth’s horizon.
to improve the magnification.
to not be limited by the Earth’s atmosphere.
to be close to the stars.
13. An electromagnetic wave with a wavelength of 600 nm is
infrared radiation.
visible radiation.
microwave radiation.
ultraviolet radiation.
14. Which of the following uses a grazing incidence telescope?
International Space Station.
International Space Observatory.
Chandra X-ray satellite.
International Ultraviolet Explorer.
15. The angle through which a ray of light is bent by a glass prism depends on the
reflectivity of the prism.
wavelength of the light.
photoelectric effect.
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 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 arcminutes
0.5 arcseconds
0.5 degrees
5 degrees
19. Which of the following space-based telescopes detected water in the Orion nebula?
Chandra
The International Space Observatory (ISO)
The International Ultraviolet Explorer (IUE)
Hubble
20. If the width of the objective of a telescope is doubled, what happens to its light gathering power?
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.
The light gathering power remains the same.
21. For a telescope the objective focal length is 80 cm and the eyepiece focal length is 2 cm, what is the magnification?
78
less than 1
160
40
22. To detect dim objects a telescope needs
large diameter.
high resolution.
high magnification.
a long tube.
23. A Charge Coupled Device is used in telescopes to
reduce the effect of segmentation of mirrors.
improve light gathering.
compensate for sagging of the mirror.
detect light.
24. Hello
World
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