L-5 » Electromagnetic Waves- MCQs (12th) | Physics | Objective Questions- 12th

Multiple Choice

ID- 15883

BSEB, 2019 (C), 2020 (A)

1. Nature of electromagnetic waves is:

(A) transverse
(B) longitudinal
(C) both transverse and longitudinal
(D) mechanical

Oct 22, 2022 at 09:04 AM

Multiple Choice

ID- 15884

BSEB, 2020 (A)

2. Which of the following is not electromagnetic wave?

(A) light waves
(B) X-rays
(C) sound waves
(D) infrared rays

Oct 22, 2022 at 09:05 AM

Multiple Choice

ID- 15885

3. A laser beam is used for locating distance objects because:

(A) it is monochromatic
(B) it is constant
(C) it is not observed
(D) it has small angular spread

Oct 22, 2022 at 09:07 AM

Multiple Choice

ID- 15886

4. When a low flying aircraft passes overhead, we sometimes notice a slight shaking of the picture of our TV screen. This is because of between the direct signal and reflected signal:

(A) interference
(B) diffraction
(C) polarisation of direct signal
(D) Both 'B' and 'C'

Oct 22, 2022 at 09:10 AM

Multiple Choice

ID- 15887

BSEB, 2018 (C)

5. Electromagnetic waves can be deflected by:

(A) Electric field only
(B) Magnetic field only
(C) Both (A) and (B)
(D) None of these

Nov 11, 2022 at 03:10 PM

Multiple Choice

ID- 15888

BSEB, 2018 (C)

6. The value of $\ce{(μ_0 ∈_0)}^{–\frac{1}{2}}$ is:

(A) 3 x $\ce{10^7}$ m/s
(B) 3 x $\ce{10^8}$ m/s
(C) 3 x $\ce{10^9}$ m/s
(D) 3 x $\ce{10^{10}}$ m/s

Oct 22, 2022 at 09:17 AM

Multiple Choice

ID- 15889

BSEB, 2019 (A), 2021 (A)

7. The direction of propagation of electromagnetic wave is:

(A) Parallel to $\overset{→}{B}$
(B) Parallel to $\overset{→}{B}$
(C) Parallel to $\overset{→}{B}$ x $\overset{→}{E}$
(D) Parallel to $\overset{→}{E}$ x $\overset{→}{B}$

Oct 22, 2022 at 09:20 AM

Multiple Choice

ID- 15890

8. The dimensional formula of $\overset{→}{E}$ is:

(A) $\ce{[MLT^{–2}A^{–1}]}$
(B) $\ce{[MLT^{–3}A^{–1}]}$
(C) $\ce{[MLT^{–2}A^{–2}]}$
(D) None of these

Oct 22, 2022 at 09:24 AM

Multiple Choice

ID- 15891

9. The dimensional formula of $\ce{\overset{→}{E}}$ is:

(A) $\ce{[MLT^{–2}A^{–1}]}$
(B) $\ce{[ML^0T^{–2}A^{–1}]}$
(C) $\ce{[ML^0T^{–3}A^{–1}]}$
(D) None of these

Oct 22, 2022 at 09:24 AM

Multiple Choice

ID- 15892

10. Which of the following has the dimensions of current?

(A) $\varepsilon_0\overset{→}{B}.\overset{→}{d}l$
(B) $μ_0\overset{→}{B}.\overset{→}{d}l$
(C) $\frac{\overset{→}{B}.\overset{→}{d}l}{μ_0}$
(D) $\frac{\overset{→}{B}.\overset{→}{d}l}{\varepsilon_0}$

Oct 22, 2022 at 09:42 AM

Multiple Choice

ID- 15893

11. Which of the following has the dimensions of charge?

(A) $\frac{\varepsilon_0 \overset{→}{E}}{\overset{→}{d}S}$
(B) $μ _0 \overset{→}{E} . \overset{→}{d}S$
(C) $\frac{\varepsilon_0}{μ_0}\overset{→}{E} . \overset{→}{d}S$
(D) $\frac{μ_0}{\varepsilon_0}\overset{→}{E} . \overset{→}{d}S$

Oct 22, 2022 at 09:49 AM

Multiple Choice

ID- 15894

12. Maxwell's equation involving $\frac{d}{dt}\overset{→}{B}$ is obtained from:

(A) Ampere's law
(B) Gauss's law
(C) Faraday's law
(D) Biot-Savart's law

Oct 22, 2022 at 10:19 AM

Multiple Choice

ID- 15895

13. The dimensions of $\overset{→}{E}.\overset{→}{d}l$ are identical to that of:

(A) potential
(B) charge
(C) current
(D) None of these

Oct 22, 2022 at 10:20 AM

Multiple Choice

ID- 15896

14. Which of the following laws was modified by Maxwell by introducing the displacement current?

(A) Gauss's law
(B) Ampere's law
(C) Biot-Savart's law
(D) None of these

Oct 22, 2022 at 10:23 AM

Multiple Choice

ID- 15897

15. Choose the wave relevant to telecommunications:

(A) ultraviolet
(B) infarad
(C) microwave
(D) visible light

Oct 22, 2022 at 10:25 AM

Multiple Choice

ID- 15898

16. Electromagnetic waves have a speed of

(A) 3 x $\ce{10^5}$ km $\ce{s^{–1}}$
(B) 3 x $\ce{10^6}$ km $\ce{s^{–1}}$
(C) 3 x $\ce{10^7}$ km $\ce{s^{–1}}$
(D) 3 x $\ce{10^8}$ km $\ce{s^{–1}}$

Oct 22, 2022 at 10:27 AM

Multiple Choice

ID- 15899

17. Which of the following EMW has highest wavelength?

(A) X-ray
(B) ultraviolet rays
(C) infrared rays
(D) microwaves

Oct 22, 2022 at 10:28 AM

Multiple Choice

ID- 15900

18. Displacement current is due to:

(A) the flow of electrons
(B) the varying electric field
(C) the ionization of atmosphere
(D) the flow of protons

Oct 22, 2022 at 10:29 AM

Multiple Choice

ID- 15901

19. EMW are produced by:

(A) charge in uniform motion only
(B) charge at rest only
(C) accelerated or deccelerated charge only
(D) all of the above

Oct 22, 2022 at 10:31 AM

Multiple Choice

ID- 15902

20. Who first demonstrated the existence of em waves?

(A) Hertz
(B) Maxwell
(C) Ampere
(D) Faraday

Oct 22, 2022 at 10:32 AM

Multiple Choice

ID- 15903

21. Name the law which states that a varying electric field produces a magnetic field:

(A) Biot-Savart's law
(B) Faraday's law
(C) Modified Ampere's law
(D) None of these

Oct 22, 2022 at 08:29 PM

Multiple Choice

ID- 15904

22. The existence of EMW was experimentally established by:

(A) Sir S.C. Bose
(B) Maxwell
(C) Marcoil
(D) Hertz

Oct 22, 2022 at 08:30 PM

Multiple Choice

ID- 15905

23. Frequency of a wave os 6 x $\ce{10^{15}}$ Hz. The wave is:

(A) Radiowave
(B) Microwave
(C) X-ray
(D) Ultra violet

Oct 22, 2022 at 08:32 PM

Multiple Choice

ID- 15906

24. Solar radiation is:

(A) transverse EMW
(B) longitudinal EMW
(C) both (A) and (B)
(D) None of these

Oct 22, 2022 at 08:34 PM

Multiple Choice

ID- 15907

25. Ampere's circuital law was modified by:

(A) Laplace
(B) Gauss
(C) Maxwell
(D) Hertz

Oct 22, 2022 at 08:35 PM

Multiple Choice

ID- 15908

26. Light year is the unit of:

(A) distance
(B) time
(C) energy
(D) intensity of light

Oct 22, 2022 at 08:36 PM

Multiple Choice

ID- 15909

27. Which of the following helps us for recognition of precious stone?

(A) Ultraviolet rays
(B) Infrared
(C) X-ray
(D) None

Oct 22, 2022 at 08:38 PM

Multiple Choice

ID- 15910

28. Oscillating electric circuits produce:

(A) Gamma rays
(B) X-rays
(C) Visible light
(D) Radiowaves

Oct 22, 2022 at 08:39 PM

Multiple Choice

ID- 15911

29. The wavelength range of visible light is:

(A) 4 x $\ce{10^{–7}}$ to 8 x $\ce{10^{–7}}$ m
(B) 4 x $\ce{10^{–6}}$ to 8 x $\ce{10^{–8}}$ m
(C) 4 x $\ce{10^{–5}}$ to 8 x $\ce{10^{–9}}$ m
(D) None of these

Oct 22, 2022 at 08:42 PM

Multiple Choice

ID- 15912

30. Velocity of EMW is given as:

(A) $\sqrt{\frac{36π x 10^9}{μ_0\varepsilon_0}}$
(B) $\frac{1}{\sqrt{μ_0\varepsilon_0}}$
(C) $\sqrt{\frac{9 x 10^9}{μ_0\varepsilon_0}}$
(D) $\sqrt{μ_0\varepsilon_0}$

Oct 23, 2022 at 06:08 AM

Multiple Choice

ID- 15913

31. The production of EMW by an oscillating charge was predicted theoretically by:

(A) Hertz
(B) Maxwell
(C) Marconi
(D) Forest

Oct 23, 2022 at 06:10 AM

Multiple Choice

ID- 15914

32. The transmission and detection of EMW was first achieved by:

(A) Hertz
(B) Maxwell
(C) Marconi
(D) Forest

Oct 23, 2022 at 06:11 AM

Multiple Choice

ID- 15915

33. 'Green house effect' is due to:

(A) transmission of visible light by atmosphere
(B) good weather
(C) reflection from atmosphere of infrared rays emitted by earth
(D) absorption of UV radiation by ozone layer

Oct 23, 2022 at 06:13 AM

Multiple Choice

ID- 15916

34. The wave impedance of free space is:

(A) zero
(B) 376.6 Ω
(C) 33.66 Ω
(D) 3.76 Ω

Oct 23, 2022 at 06:15 AM

Multiple Choice

ID- 15917

35. The unit of poynting vector is:

(A) $\ce{W/m^2}$
(B) $\ce{J/m^2}$
(C) $\ce{T/m}$
(D) Hertz

Oct 23, 2022 at 06:19 AM

Multiple Choice

ID- 15918

36. Poynting vector is given as:

(A) $\overset{→}{E}$ x $\overset{→}{H}$
(B) $\overset{→}{E}$ / $\overset{→}{H}$
(C) $\overset{→}{E}$ . $\overset{→}{H}$
(D) $\overset{→}{H}$ / $\overset{→}{E}$

Oct 23, 2022 at 06:21 AM

Multiple Choice

ID- 15919

37. The energy density is expressed in:

(A) kg $\ce{m^{–3}}$
(B) J $\ce{m^{–2}}$
(C) J $\ce{m^{–3}}$
(D) J

Oct 23, 2022 at 06:22 AM

Multiple Choice

ID- 15920

BSEB, 2016

38. Ampere-hour is unit of:

(A) Power
(B) Charge
(C) Energy
(D) Potential difference

Oct 23, 2022 at 06:23 AM

Multiple Choice

ID- 15921

BSEB, 2017 (A)

39. The direction of transmission of electromagnetic wave

(A) Parallel to $\overset{→}{E}$
(B) Parallel to $\overset{→}{B}$
(C) Parallel to $\overset{→}{B}$ x $\overset{→}{E}$
(D) Parallel to $\overset{→}{E}$ x $\overset{→}{B}$

Oct 23, 2022 at 06:25 AM

Multiple Choice

ID- 15922

BSEB, 2017 (A)

40. The unit of ratio of magnetic field Band electric field E(B/E) is

(A) $\ce{ms^{–1}}$
(B) $\ce{sm^{–1}}$
(C) ms
(D) $\ce{ms^{–2}}$

Oct 23, 2022 at 06:28 AM

Multiple Choice

ID- 15923

BSEB, 2018 (A)

41. The energy of an electromagnetic radiation is 13.2 KeV. This radiation is related to which region of spectrum?

(A) Visible
(B) X-rays
(C) Ultra violet
(D) Infrared

Oct 23, 2022 at 06:30 AM

Electromagnetic Waves

Board » Bihar Board » Class 12th » English Medium » Science » Physics » L-5: Electromagnetic Waves

Objective Questions (MCQs)

1. Nature of electromagnetic waves is:

2. Which of the following is not electromagnetic wave?

3. A laser beam is used for locating distance objects because:

4. When a low flying aircraft passes overhead, we sometimes notice a slight shaking of the picture of our TV screen. This is because of between the direct signal and reflected signal:

5. Electromagnetic waves can be deflected by:

6. The value of $\ce{(μ_0 ∈_0)}^{–\frac{1}{2}}$ is:

7. The direction of propagation of electromagnetic wave is:

8. The dimensional formula of $\overset{→}{E}$ is:

9. The dimensional formula of $\ce{\overset{→}{E}}$ is:

10. Which of the following has the dimensions of current?

11. Which of the following has the dimensions of charge?

12. Maxwell's equation involving $\frac{d}{dt}\overset{→}{B}$ is obtained from:

13. The dimensions of $\overset{→}{E}.\overset{→}{d}l$ are identical to that of:

14. Which of the following laws was modified by Maxwell by introducing the displacement current?

15. Choose the wave relevant to telecommunications:

16. Electromagnetic waves have a speed of

17. Which of the following EMW has highest wavelength?

18. Displacement current is due to:

19. EMW are produced by:

20. Who first demonstrated the existence of em waves?

21. Name the law which states that a varying electric field produces a magnetic field:

22. The existence of EMW was experimentally established by:

23. Frequency of a wave os 6 x $\ce{10^{15}}$ Hz. The wave is:

24. Solar radiation is:

25. Ampere's circuital law was modified by:

26. Light year is the unit of:

27. Which of the following helps us for recognition of precious stone?

28. Oscillating electric circuits produce:

29. The wavelength range of visible light is:

30. Velocity of EMW is given as:

31. The production of EMW by an oscillating charge was predicted theoretically by:

32. The transmission and detection of EMW was first achieved by:

33. 'Green house effect' is due to:

34. The wave impedance of free space is:

35. The unit of poynting vector is:

36. Poynting vector is given as:

37. The energy density is expressed in:

38. Ampere-hour is unit of:

39. The direction of transmission of electromagnetic wave

40. The unit of ratio of magnetic field Band electric field E(B/E) is

41. The energy of an electromagnetic radiation is 13.2 KeV. This radiation is related to which region of spectrum?