Q1. Cellular phones use which type of electromagnetic waves for voice communication?A. MicrowavesB. Infrared wavesC. Radio wavesD. Ultraviolet waves
Q2. Why are X-rays suitable for imaging bones in medical diagnostics?A. They heat tissuesB. They emit visible lightC. They are reflected by bonesD. They penetrate soft tissues
Q3. Why are UV rays used in LASIK eye surgery?A. They heat the corneaB. They emit visible lightC. They can be focused into narrow beamsD. They penetrate deeper into tissues
Q4. Why are X-rays used as a diagnostic tool in medicine?A. They heat tissuesB. They emit visible lightC. They kill germsD. They penetrate tissues for imaging
Q5. What makes electromagnetic waves different from other waves discussed in the document?A. They have higher frequenciesB. They are always visibleC. They travel slowerD. They require no material medium
Q6. What is the role of displacement current in Maxwell's generalization of Ampere's law?A. It produces a magnetic field due to a changing electric fieldB. It accounts for conduction current onlyC. It eliminates the need for conduction currentD. It opposes the magnetic field in all cases
Q7. In the context of electromagnetic waves, what physical characteristic distinguishes radio waves from gamma rays?A. Speed of propagationB. WavelengthC. Direction of propagationD. Medium of travel
Q8. Which Maxwell equation describes the generation of an electric field by a changing magnetic field?A. Gauss's Law for electricityB. Gauss's Law for magnetismC. Faraday's LawD. Ampere-Maxwell Law
Q9. Why does the speed of electromagnetic waves in a medium depend on the medium’s properties?A. Dependence on permittivity and permeabilityB. Dependence on frequencyC. Constant speed in all mediaD. Absence of electric fields
Q10. What is a common method to detect infrared waves as per the document?A. Geiger tubesB. Receiver's aerialsC. BolometersD. Photocells