1. Lasers are used in surgery because they:
(A) Can cut tissues precisely
(B) Can display images
(C) Produce incoherent light
(D) Cool tissues
2. Which type of laser is commonly used in eye surgery?
(A) Dye laser
(B) CO₂ laser
(C) Helium-Neon laser
(D) Excimer laser
3. Lasers are used in barcode scanners because they:
(A) Produce polychromatic light
(B) Provide a directional and focused beam
(C) Emit heat
(D) Reflect light randomly
4. In industry, lasers are used for:
(A) Spectroscopy
(B) Data storage
(C) Holography
(D) Cutting, welding, and engraving
5. Lasers are used in communication because they:
(A) Scatter easily
(B) Produce incoherent light
(C) Can transmit data over long distances
(D) Require no alignment
6. Helium-Neon lasers are commonly used in:
(A) Metal cutting
(B) Alignment and leveling tools
(C) Eye surgery
(D) Barcode scanning
7. Laser printers work by:
(A) Spraying ink directly
(B) Using a focused laser beam to form images on a drum
(C) Heating paper
(D) Using LED light
8. CO₂ lasers are preferred in industry because they:
(A) Cannot cut metals
(B) Produce visible light only
(C) Are low-intensity
(D) Emit high-power infrared light
9. Lasers are used in CD/DVD players to:
(A) Scan barcodes
(B) Store energy
(C) Amplify sound
(D) Read data accurately
10. Lasers are used in holography because they are:
(A) Incoherent
(B) Polychromatic
(C) Scattered
(D) Coherent and monochromatic
11. Semiconductor lasers are commonly used in:
(A) CO₂ cutting
(B) Fiber optic communication
(C) Eye surgery
(D) Barcode scanning
12. Laser spectroscopy is used for:
(A) Cutting metals
(B) Studying atomic and molecular structures
(C) Reading CDs
(D) Eye surgery
13. Laser rangefinders are used to:
(A) Measure distances accurately
(B) Cut metals
(C) Store data
(D) Generate heat
14. Lasers are used in military applications for:
(A) Barcode scanning
(B) Printing documents
(C) Holography
(D) Targeting, range finding, and guidance systems
15. Laser light shows are possible because lasers are:
(A) Polychromatic
(B) Coherent and directional
(C) Incoherent
(D) Diffused
16. In medicine, lasers are used for:
(A) Reading CDs
(B) Removing tumors and performing precise surgery
(C) Engraving metals
(D) Barcode scanning
17. Lasers are used in 3D printing because they:
(A) Measure distances
(B) Cut barcodes
(C) Read CDs
(D) Can solidify materials layer by layer
18. CO₂ lasers emit:
(A) Red light only
(B) Infrared light suitable for cutting and welding
(C) Blue light only
(D) Visible white light
19. Lasers are used in tattoo removal because they:
(A) Amplify light
(B) Break down pigment particles
(C) Read CDs
(D) Cut metal
20. In entertainment, lasers are used for:
(A) Cutting metals
(B) Light shows and projection
(C) Reading barcodes
(D) Fiber optic communication
21. Lasers in astronomy are used for:
(A) Printing
(B) Cutting metals
(C) Measuring distances to stars and satellites
(D) Eye surgery
22. Laser Doppler velocimetry is used for:
(A) Cutting metals
(B) Measuring fluid velocity
(C) Reading CDs
(D) Holography
23. Lasers are used in dentistry for:
(A) Removing decay and performing surgery
(B) Reading barcodes
(C) Fiber optic communication
(D) Printing documents
24. Which property of lasers makes them suitable for communication?
(A) Polychromatic
(B) Scattered and incoherent
(C) Monochromatic and coherent
(D) Diffused
25. Laser light is used in CD/DVD burning because it:
(A) Produces sound
(B) Cuts metals
(C) Measures distance
(D) Can precisely heat and change the surface
26. Barcode scanners use laser because:
(A) It can reflect accurately from small bar patterns
(B) It cuts metals
(C) It produces sound
(D) It prints images
27. Lasers are used in military rangefinding because they:
(A) Remove tumors
(B) Cut metals
(C) Provide precise distance measurement
(D) Engrave surfaces
28. In industry, laser welding is preferred because it:
(A) Produces sound
(B) Provides high precision and small heat-affected zone
(C) Reads data
(D) Measures distance
29. Laser pointers are commonly used for:
(A) Holography
(B) Cutting metals
(C) Presentations and pointing
(D) Fiber optics
30. Lasers are used in scientific research for:
(A) Printing documents
(B) Spectroscopy, holography, and particle measurement
(C) Barcode scanning only
(D) Fiber optic installation