FOLM Q 1

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LASER Stands for

• Light and Sound enabled receiver

• Light Amplification by Spontaneous emission of Radiation

• Light Amplification by Stimulated Emission of Radiation

• Light Amplification by Stimulated Emission of Radium

................... allow doctors to evaluate the interior surfaces of an organ by inserting a small tube into the body through a small cut.

One of the following is not a characteristic of light detectors.

• Responsitivity

• Spectral response

• Transmit time

•  

  Dispersion

Which of the following equation is used to determine depth of sea/ submarines, etc.

• d=vt/2
• d=vt
• d=vt^2
• d=v^2/t
• None of these

Laser has the following properties

• Coherance

• High Intensity

• Monocromatic

• Population inversion

• All of these

The schematic represents

• Graded index optical fibre

• Step index optical fibre

• Single mode optical fibre

• Dual optical fibre

In which of the following optic fibre sensor the fibre is simply used to carry light to and from an external optical device where the sensing takes place?

• INTRINSIC SENSORS

• EXTRINSIC SENSORS

• TEMPERATURE SENSORS

• DISPLACEMENT SENSORS

Which type of fiber-optic cable is the best for very high speed data?

• Single-mode step-index

• Multimode step-index

• Single-mode graded-index

• Multimode graded-index

In thin film interference, for a given source of light, a thin film of constant thickness appears,

• Bright and dark bands

• Dark

• Bright

• Bright or Dark