Some examples from this set of practice questions
1.
What is CCD?
Answer: An intergrated circuit containing an array of linked capacitors, or coupled capacitors. Under control of an external circuit, each capacitor can transfer its electrical charge to a neighbouring capacitor.
2.
Where do optical telescopes need to be located?
Answer: High altitude And radio quite area
3.
Where do radio telescopes need to be located?
Answer: Any altitude, away from city and lights.
4.
What needs to be large in a telescope in order to produce detailed image?
Answer: Diameter- when diameter increases the angular resolution decreases, meaning a more clear imagine will be formed.
5.
Similarities of a Radio and Optical telescope?
Answer: Both have a primary reflector: - for Radio telescopes it is a Dish made out of wire mesh - For optical telescopes it is a primary concave mirror.
6.
Which telescope is longer: Refracting or Reflecting?
Answer: Refracting- focal point of objective lens is big meaning a larger magnification. Additionally the separation of lens enables length of telescope to be greater
7.
What is Quantum efficiency?
Answer: The number of detected electrons/ number of incident photons.
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