You are given a passage. You need to construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) its answer is the whole paragraph. Avoid creating questions that can be answered correctly without actually understanding the paragraph.
Example: Optical mice use an LED and a camera to rapidly
capture images of the surface beneath the mouse.
The infomation from the camera is analyzed by a
DSP (Digital Signal Processor) and used to detect
imperfections in the underlying surface and
determine motion. Some materials, such as glass,
mirrors or other very shiny, uniform surfaces
interfere with the ability of the DSP to
accurately analyze the surface beneath the mouse.
\nSince glass is transparent and very uniform, the
mouse is unable to pick up enough imperfections in
the underlying surface to determine motion.
Mirrored surfaces are also a problem, since they
constantly reflect back the same image, causing
the DSP not to recognize motion properly. When the
system is unable to see surface changes associated
with movement, the mouse will not work properly.
Example solution: why doesn't an optical mouse work on a glass
table?
Example explanation: The passage talks about the glass and mirror surfaces beneath the optical mice and how the mouse is unable to pick up enough imperfections in the underlying surface to determine motion. The last line of the passage explains why the mouse will not work properly on these surfaces. Thus it is a positive example.

Problem: 110 Volts is nominal and may vary when measured by a voltmeter.  That said, power is supplied using sets of three separate parallel wires that you can see up on most power poles.  The very high voltage there is stepped down using a transformer to supply most houses and businesses with a usable lower voltage.  The voltage between any one of the three wires to ground in a house is 110 Volts for example to light a light bulb.  The voltage between any two wires is 220 Volts and is used for example to power a clothes dryer or kitchen range.  Houses do not use all three wires.  A machine shop may power a large motor by connecting all three wires (in a delta or Y configuration) to obtain 440 Volts.  Therefore the progression of 110, 220, and 440 Volts stems from the use of single, two and three-phase wiring circuits.  Electrical power is conducted cross-country at very high voltages using high tension lines strung in sets of three wires or phases which produces the multiple of 11 you mention.  Incidentally there may be an additional single wire above all the rest to arrest lightning strikes.

Solution: Why is the voltage ratinging always a multiple of 11 ?