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Orbital Motion, Natural And Artificial Satellites (physics Only) (GCSE Physics)

The following is a GCSE Physics test covering 'Orbital Motion, Natural And Artificial Satellites (physics Only)' from the broader topic Space Physics. The test is geared towards the AQA exam board style syllabus.
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Which body is the main cause of the Earth’s ocean tides?
Why do satellites in low Earth orbit (LEO) experience more atmospheric drag than satellites in higher orbits?
Why are polar orbits useful for Earth-mapping and weather-monitoring missions?
What must a spacecraft reach or exceed to escape permanently from a planet’s gravitational field (neglecting other forces)?
A satellite transmits a signal to a receiver on Earth. If the satellite is moving toward the receiver, what happens to the received frequency due to the Doppler effect?
What is the Kessler syndrome (a potential hazard in orbit)?
What provides the centripetal force that keeps an artificial satellite in orbit around Earth?
How does the orbital speed of a satellite change as its orbital altitude increases (holding a circular orbit)?
Which orbit is most commonly used for Earth observation satellites that need high spatial resolution?
Near Earth, how does the gravitational field strength g change as distance from Earth’s centre increases?
Why do Earth observation satellites that need very high image detail usually operate in low Earth orbit rather than geostationary orbit?