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What is Laser The way Laser Works Different Types of Laser The Power range of Laser

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TEST YOURSELF

QUESTIONS

  1. LASER is used for alignment, it is due to its property :

  1. Directional

  2. High intensity

  3. Coherence

  4. Both directional & high intensity


Answer

  • Which type of optical technique is used for small and medium distance measurement with Laser ? :

    1. Beam modulation

    2. Interferometric

    3. Pulse-echo

    4. All of the above


    Answer

  • For long distance measurement (more than 1 Km.) what type of laser is used ? :

    1. Continuous

    2. Single pulse

    3. Repeatative pulse

    4. None of the above


    Answer

  • For liquid flow (slow velocity) measurement which configuration is preferable for Laser Doppler Velocitimetry ? :

    1. Forward scattering mode

    2. Back scattering mode

    3. Reference beam method

    4. Any one of the above


    Answer

  • In ring Laser gyro which of the following path is travelled by the laser ? :

    1. Clockwise

    2. Anticlockwise

    3. Both clockwise and anticlockwise

    4. Can not be said


    Answer

  • The laser beam of CO2 lasers are transmitted to the workpiece using :

    1. Optical fibres

    2. Pipelines consisting of glass mirrors

    3. Pipelines consisting of special optics

    4. Any of the above


    Answer

  • Semiconductor lasers are made of semiconductor of type :

    1. Intrinsic

    2. Non-intrinsic small doped

    3. Non-intrinsic highly doped

    4. Both B & C


    Answer

  • In Fibre optic communication, Semiconductor lasers are preferred for :

    1. Ease in modulation of the signal

    2. It's low cost, small size,

    3. Compatibility in a chip with electronic components

    4. It's high power efficiency


    Answer

  • Lasing is possible after one pass of the beam through the resonator :

    1. Always true

    2. Sometimes true

    3. False

    4. Lasing has no relation with the number of pass.


    Answer

  • Amplification of a beam depends on :

    1. Resonator configuration

    2. Active medium

    3. Reflectivity of the mirrors

    4. All of the above


    Answer

  • For reconstruction of transmission hologram, if a conventional source is used, the result is :

    1. No image

    2. Two sharp image

    3. Two blurred images

    4. One coloured image will be formed


    Answer

  • One LASER system cannot give output as :

    1. Sigle wavelength

    2. Broadband wavelenghs

    3. Multiple wavelengths

    4. Continuous wavelength


    Answer

  • Lasers used in spectroscopy are :

    1. He-Ne

    2. Ruby

    3. Tunable diode

    4. All kinds of lasers


    Answer

  • Diode laser can be tuned by changing :

    1. Temperature and current

    2. Temperature only

    3. Current only

    4. The shape


    Answer

  • LASER is hazardous because it damages the :

    1. Skin

    2. Eye

    3. Heart

    4. None of the above


    Answer

  • Laser is so special because it is :

    1. Pure i.e., all the light rays in the beam are of same colour i.e., same wave length

    2. Well collimated

    3. Same frequency & Coherent

    4. None of the above


    Answer

  • Particular emission process is important in laser , i.e., :

    1. Spontaneous

    2. Stimulated

    3. Both

    4. None of the above


    Answer

  • The components of any Laser device are :

    1. Active medium & Optical resonance

    2. Active medium & Pumping source

    3. Optical resonance & Pumping source

    4. Active medium , Pumping source &Optical resonance


    Answer

  • The colour of a LED can be changed by :

    1. Using different band gap semiconductor

    2. Cchanging the doping level of the semiconductor

    3. Increasing applied voltage

    4. None of the above


    Answer

  • Q- Switched laser is a :

    1. Continuous laser

    2. Short burst laser

    3. Laser produced by switching operation

    4. Lower power laser


    Answer

  • Optical communication is feasible only in the IR range because it offers :

    1. Minimum dispersion

    2. Minimum attenuation

    3. Both A & B

    4. None of the above


    Answer

  • Which of the following is not applicable for laser :

    1. No tuning arrangements

    2. Higher emission efficiency

    3. Narrow spectral width

    4. Provision for confinement


    Answer

  • Which of the following condition is true for every laser :

    1. Rate of stimulated emission > rate of spontaneous emission

    2. There should be no spontaneous emission

    3. Rate of stimulated emission = rate of spontaneous emission

    4. There should be no stimulated emission


    Answer

  • Which of the following is true every laser :

    1. Spatial coherence

    2. Temporal coherence

    3. Both A & B

    4. None of the above


    Answer

  • Transmission of signal through optical fibre is in the form of :

    1. Sound

    2. Electricity

    3. Light

    4. None of the above


    Answer

  • In communication repeaters are used to :

    1. Amplify the signal

    2. Reshape the signal

    3. Either A or B

    4. Both A & B


    Answer

    Ans.1. D. LASER is used for alignment due to its both directional & high intense property

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    Ans.2 B.Interferometric

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    Ans.3 C. Repeatative pulse laser

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    Ans.4..A. Forward scattering mode

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    Ans.5. C.Both clockwise and anticlockwise

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    Ans.6. C. Pipelines consisting of special optics

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    Ans.7. C. Non-intrinsic highly doped semiconductor

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    Ans.8. C. Compatibility in a chip with electronic components

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    Ans.9. B. Sometimes true

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    Ans.10. D. .All of the above

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    Ans.11. A. No image

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    Ans.12. D. continuous wavelength

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    Ans.13.C. Tunable diode

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    Ans.14. A. Temperature and current

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    Ans.15. B. Eye

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    Ans.16. C. Same frequency & Coherent

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    Ans. 17. B. Stimulated

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    Ans. 18.D. Active medium , Pumping source &Optical resonance

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    Ans. 19. A.Using different band gap semiconductor

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    Ans. 20. B. Short burst laser

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    Ans. 21. B. Minimum attenuation

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    Ans. 22. A. No tuning arrangements

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    Ans. 23. A. Rate of stimulated emission > rate of spontaneous emission

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    Ans. 24.C. Both A & B

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    Ans.25.C. Light

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    Ans. 26. D, Both A & B

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    What is Laser The way Laser Works Different Types of Laser The Power range of Laser

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