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 1 second.
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 speed of light changes.
Because the frequency increases.
Because the amplitude is reduced.
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?
Refraction
Diffraction
Dispersion
Interference
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
reduced by approximately 60%
reduced by approximately 1%
increased by approximately 50%
the same as in vacuum
7. Diffraction gratings are used for
detecting microwave radiation.
reducing the diffraction of telescopes.
increasing the angular resolution of telescopes.
analysing the light spectrum.
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?
Wavelength
Colour
Amplitude
Speed
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 it interferes with the surface.
Because the amplitude is reduced.
Because the frequency increases.
11. A Newtonian telescope has
a diverging secondary mirror.
a correction plate.
just the primary mirror.
a flat secondary mirror.
12. The Hubble telescope was placed in space in order
to not be limited by the Earth’s atmosphere.
to be close to the stars.
to not be limited by the Earth’s horizon.
to improve the magnification.
13. An electromagnetic wave with a wavelength of 600 nm is
microwave radiation.
infrared radiation.
visible radiation.
ultraviolet radiation.
14. Which of the following uses a grazing incidence telescope?
International Space Station.
International Ultraviolet Explorer.
Chandra X-ray satellite.
International Space Observatory.
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 can be expressed as brightness and colour.
If light moves in one direction, then it moves in the opposite direction also.
Light behaves like a wave and like a particle.
Light goes slow and fast.
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)
Chandra
Hubble
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 is increased by a factor of two.
The light gathering power increased by a factor of four.
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
78
less than 1
160
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
detect light.
improve light gathering.
reduce the effect of segmentation of mirrors.
compensate for sagging of the mirror.
24. Hello
World
Submit Quiz