NEET Physics: Electromagnetic Waves — Practice Set 2

Q1. What is the approximate wavelength range of ultraviolet rays as per the document?

A. \( > 0.1 \, \text{m} \)
B. \( 0.1 \, \text{m} \) to \( 1 \, \text{mm} \)
C. \( 1 \, \text{mm} \) to \( 700 \, \text{nm} \)
D. \( 400 \, \text{nm} \) to \( 0.6 \, \text{nm} \)

Q2. What is the frequency range of visible light?

A. \( 10^9 \, \text{Hz} \) to \( 10^{11} \, \text{Hz} \)
B. \( 4 \times 10^{14} \, \text{Hz} \) to \( 7 \times 10^{14} \, \text{Hz} \)
C. \( 10^{16} \, \text{Hz} \) to \( 10^{18} \, \text{Hz} \)
D. \( 500 \, \text{kHz} \) to \( 1000 \, \text{MHz} \)

Q3. Why are infrared waves detected in applications monitoring crop growth?

A. High penetration
B. Visible spectrum
C. Plant reflectivity
D. Thermal heating

Q4. Why are infrared waves important for maintaining Earth's average temperature?

A. They reflect sunlight
B. They emit UV radiation
C. They contribute to the greenhouse effect
D. They cool the atmosphere

Q5. An electromagnetic wave has a magnetic field amplitude of \( B_0 = 8 \times 10^{-8} \, \text{T} \). What is the electric field amplitude? (Given \( c = 3 \times 10^8 \, \text{m/s} \))

A. 16 V/m
B. 18 V/m
C. 20 V/m
D. 24 V/m

Q6. Why are X-rays used in medicine to treat certain forms of cancer?

A. They emit visible light
B. They heat tissues
C. They enhance cell growth
D. They destroy cancer cells

Q7. An electromagnetic wave in vacuum has a wavelength of \( 5 \, \text{m} \). What is its frequency? (Given \( c = 3 \times 10^8 \, \text{m/s} \))

A. \( 3 \times 10^7 \, \text{Hz} \)
B. \( 5 \times 10^7 \, \text{Hz} \)
C. \( 6 \times 10^7 \, \text{Hz} \)
D. \( 9 \times 10^7 \, \text{Hz} \)

Q8. In electromagnetic theory, what explains the constant ratio of electric to magnetic field amplitudes in a wave?

A. Frequency variation
B. Medium properties
C. Maxwell’s equations
D. Static fields

Q9. Why are UV rays harmful in large quantities?

A. They heat the skin excessively
B. They emit visible light
C. They have harmful effects on humans
D. They enhance thermal motion

Q10. Why does the absence of conduction current in certain regions necessitate the concept of displacement current?

A. To explain magnetic field generation
B. To eliminate electric fields
C. To create static fields
D. To cancel conduction currents

Q11. X-rays are typically used in medicine for which purpose?

A. Heating tissues
B. Killing germs
C. Detecting infrared radiation
D. Diagnosis and cancer treatment

Q12. Which of the following is used to detect X-rays?

A. Thermopiles
B. Photocells
C. Geiger tubes
D. Receiver's aerials

Q13. In electromagnetic wave propagation, what ensures that the electric and magnetic fields sustain each other?

A. Mutual induction via Maxwell’s equations
B. Constant electric field strength
C. Presence of a material medium
D. Static magnetic fields

Q14. A parallel plate capacitor with plate area \( A = 0.01 \, \text{m}^2 \) and separation \( d = 2 \, \text{mm} \) is being charged at a rate of \( \frac{dQ}{dt} = 0.5 \, \text{A} \). What is the displacement current between the plates? (Given \( \varepsilon_0 = 8.85 \times 10^{-12} \, \text{F/m} \))

A. 0.25 A
B. 0.5 A
C. 0.75 A
D. 1.0 A

Q15. What makes electromagnetic waves capable of carrying energy over long distances?

A. Their dependence on a medium
B. Their constant wavelength
C. Their variable frequency
D. Their oscillating electric and magnetic fields

Physics — Electromagnetic Waves

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