10 Questions
| Attempts: 152

Questions and Answers

- 1.To width of any object, multiply the given length by 2, subtract the result from the object perimeter, you now have the total length for the remaining 2 sides, divide the number you get by 2, that is the width, this process is used to find?
- A.
Mass of an object

- B.
Area of an object

- C.
Length of and object

- D.
Width of an object

- 2.Length measurement is implemented in practice in many ways, most commonly used approaches are the transit-time methods and the interferometer methods based upon?
- A.
Speed of light

- B.
Wavelength

- C.
Sun rays

- D.
None of the above

- 3.For objects such as crystals and diffraction gratings, the measurement technique for three-dimensional structures very small in every dimension use a specialized instrument such as ion microscopy coupled with intensive computer modeling, diffraction is used with?
- A.
Electron beams

- B.
X-rays

- C.
Light rays

- D.
A and B only

- 4.The simplest kind of length measurement tool, lengths are defined by printed marks or engravings on a stick, the meter was initially defined using a ruler before more accurate methods became available which is a?
- A.
Tape rule

- B.
Ruler

- C.
Meter

- D.
None of the above

- 5.Small or microscopic objects where the length is calibrated using a graticule can be used. A graticule is a piece that has lines for precise lengths etched into it, the process is called?
- A.
Microphotography

- B.
Logoteraphy

- C.
Microphotoscenery

- D.
None of the above

- 6.The basic idea behind a transit-time measurement of length is to send a signal from one end of the length to be measured to the other and back again, the time taken for the round trip is referred to as?
- A.
Transit Time

- B.
To and Fro movement

- C.
Pendulum

- D.
None of the above

- 7.If the light is used for the signal, its speed depends upon the medium in which it propagates, in SI units, the speed is a defined value c
_{0 }in the reference medium of?- A.
Vacuum

- B.
Refractive index

- C.
Classic Vacuum

- D.
None of the above

- 8.In a practical environment, and for precision work, measurement of dimension using transit-time measurements is used only as an initial indicator of length and is refined using an?
- A.
Meter

- B.
Tape rule

- C.
Interferometer

- D.
None of the above

- 9.A schematically way of determining length is using an interferometer, the two panels will show a laser source emitting a light beam split by a beam splitter to travel two paths, this device is called?
- A.
Laser-fused interferometer

- B.
Nanometer

- C.
Barometer

- D.
Michelson interferometer

- 10.Some system of units, unlike the current SI system, lengths are fundamental units, like wavelengths in the older SI units and borhs in atomic units are not defined by times of?
- A.
Transit

- B.
Displacement

- C.
Oscillation

- D.
None of the above

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