NEET UG PHYSICS Multiple Choice Questions (MCQs)
NEET UG Physics - Unit 15: Electromagnetic Waves
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What is the main characteristic of electromagnetic waves?
- a) They require a medium to propagate
- b) They are longitudinal waves
- c) They are transverse waves
- d) They can only travel in vacuum
Answer: c) They are transverse waves
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What does the displacement current explain in the context of electromagnetism?
- a) The current produced by magnetic fields
- b) The current produced by changing electric fields
- c) The interaction between electric and magnetic fields
- d) The flow of charge in a conductor
Answer: b) The current produced by changing electric fields
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Which of the following electromagnetic waves has the shortest wavelength?
- a) Radio waves
- b) Microwaves
- c) Ultraviolet rays
- d) Gamma rays
Answer: d) Gamma rays
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The speed of electromagnetic waves in a vacuum is approximately:
- a) 3 × 10⁶ m/s
- b) 3 × 10⁸ m/s
- c) 3 × 10⁴ m/s
- d) 3 × 10² m/s
Answer: b) 3 × 10⁸ m/s
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Which of the following electromagnetic waves is used in cooking food?
- a) Radio waves
- b) Microwaves
- c) X-rays
- d) Infrared rays
Answer: b) Microwaves
-
Which region of the electromagnetic spectrum is visible to the human eye?
- a) Radio waves
- b) Microwaves
- c) Infrared
- d) Visible light
Answer: d) Visible light
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Electromagnetic waves are produced by:
- a) Moving charges
- b) Static charges
- c) Electric fields alone
- d) Magnetic fields alone
Answer: a) Moving charges
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The electromagnetic spectrum includes all of the following EXCEPT:
- a) Gamma rays
- b) X-rays
- c) Visible light
- d) Sound waves
Answer: d) Sound waves
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In which of the following situations do electromagnetic waves travel at the same speed?
- a) In air and vacuum
- b) In different media
- c) In vacuum only
- d) In water and air
Answer: c) In vacuum only
-
What is the primary application of X-rays in medical science?
- a) Treatment of cancer
- b) Imaging of internal structures
- c) Killing bacteria
- d) Blood circulation monitoring
Answer: b) Imaging of internal structures
-
Which of the following electromagnetic waves has the longest wavelength?
- a) Gamma rays
- b) Radio waves
- c) Microwaves
- d) Ultraviolet rays
Answer: b) Radio waves
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What is the frequency range of microwave radiation?
- a) 10³ - 10⁹ Hz
- b) 10⁸ - 10¹² Hz
- c) 10¹² - 10¹⁴ Hz
- d) 10¹⁴ - 10²⁰ Hz
Answer: a) 10³ - 10⁹ Hz
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What is the main application of ultraviolet (UV) rays?
- a) Used in cooking
- b) Used in sterilizing medical equipment
- c) Used in radio broadcasting
- d) Used in television signals
Answer: b) Used in sterilizing medical equipment
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The energy of an electromagnetic wave is proportional to:
- a) Its amplitude
- b) Its wavelength
- c) Its frequency
- d) Its speed
Answer: c) Its frequency
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Which of the following electromagnetic waves has the highest energy?
- a) Microwaves
- b) Infrared
- c) X-rays
- d) Gamma rays
Answer: d) Gamma rays
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