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Chapter 8. Electromagnetic Waves > MULTIPLE-CHOICE QUESTIONS

MULTIPLE-CHOICE QUESTIONS

  1. At the Brewster angle, polarization ______________.

    1. Cannot be reflected

    2. Is reflected at 30°

    3. Is reflected at 90°

    4. None of these

  2. Wave number has units of____________.

    1. Radians

    2. Meter

    3. Radians/meter

    4. None of these

  3. Wave speed in terms of frequency f and wavelength λ is expressed as _________.

    1. f

    2. λ/f

    3. λ f

    4. (λ + f)

  4. For a lossy dielectric medium, ____________.

    1. σ = 0

    2. σ ≠ 0

    3. None of these

    4. Cannot say

  5. Wave attenuation is given as ______________.

    1. e+βx

    2. e-βx

    3. e+αx

    4. e−αx

  6. In the case of a perfect dielectric medium, phase constant ______________ as conductivity increases.

    1. Increases

    2. Decreases

    3. Remains unchanged

    4. None of these

  7. Phase velocity is given as _________.

    1. ωβ

    2. βω

    3. β/ω

    4. None of these

  8. For a good conductor ________________.

  9. For a good dielectric medium ____________.

  10. In good conductors, rate of attenuation is __________.

    1. Small

    2. Large

    3. Infinity

    4. Zero

  11. Poynting Vector is obtained as

  12. Power density has _________________.

    1. A DC component

    2. A second harmonic component

    3. Both (a) and (b)

    4. None of these

  13. Reflection coefficient Γ is __________.

    1. ≥100

    2. = 10

    3. ≤ 1

    4. None of these

  14. Which of the following expressions is correct?

    1. (1 + Γ) = τ

    2. (1 + τ) = Γ

    3. (1 + Γ) τ = 0

    4. (1 + τ)Γ = 0

  15. Transmission coefficient is given as __________.

  16. Standing wave consists of two travelling waves of ____________ amplitudes and _____________ is direction.

    1. Unequal, same

    2. Unequal, opposite

    3. Equal, same

    4. Equal, opposite

  17. Standing wave ratio S is given as __________.

  18. SNR ranges from ______.

    1. 0 to 1

    2. 1 to 10

    3. 10 to 100

    4. 1 to ∞

  19. As per Snell's Law _______.

  20. Brewster's angle is given as tan θB = ____________.

    1. None of these


  

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