1. What is the pumping source in Ruby laser?

1. Electrical Pumping
2. Optical
3. Chemical
4. None of the above

II. What is the output in wavelength of ruby laser?

1. 6943 angstroms
2. 6328 angstroms
3. 5400 angstroms
4. 8000 angstroms

III. Is Ruby laser a gas laser?

1. True
2. false

IV. What is the pumping source in Helium – Neon laser?

1. Electrical Pumping
2. Optical
3. Chemical
4. None of the above

V. What is the output in wavelength of Helium-Neon laser?

1. 6943 angstroms
2. 6328 angstroms
3. 5400 angstroms
4. 8000 angstroms

VI. Ruby laser is a ___________ level laser.

1. Three
2. Four
3. Five
4. Two

VII. Helium-Neon laser is a ___________ level laser.

1. Three
2. Four
3. Five
4. Two

VIII. In LASER, S stands for:

1. Spontaneous
2. Stimulated
3. Simultaneously
4. None of the above

IX. Laser medium in Ruby laser is:

1. Aluminium oxide
2. Chromium oxide
3. Chromium oxide doped with aluminium ions
4. Aluminium oxide doped with chromium ions

X. Which laser has continuous output?

1. Ruby laser
2. Helium-Neon laser
3. Both
4. None of the above

Answers: I. (2), II (1), III(2), IV(1), V(2), VI(1), VII (2), VIII (2), IX (4), X(2) The above are the 10 important MCQs of laser, Ruby laser and Helium-Neon laser.

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