Electromagnetic Waves

1. A.
   $2{\cdot}0 \times 10^{8}\ \mathrm{ms^{-1}}$
2. B.
   $4{\cdot}5 \times 10^{7}\ \mathrm{ms^{-1}}$
3. C.
   $3{\cdot}5 \times 10^{7}\ \mathrm{ms^{-1}}$
4. D.
   $2{\cdot}5 \times 10^{8}\ \mathrm{ms^{-1}}$

Tap an option to check your answer.

1. A.
   wavelength is doubled and frequency remains unchanged.
2. B.
   wavelength is doubled and frequency is halved.
3. C.
   wavelength is halved and frequency remains unchanged.
4. D.
   wavelength and frequency both will remain unchanged.

Tap an option to check your answer.

1. A.
   $0{\cdot}5 \times 10^{3}\ \mathrm{m^{-1}}$
2. B.
   $6{\cdot}0 \times 10^{2}\ \mathrm{m^{-1}}$
3. C.
   $7{\cdot}5 \times 10^{2}\ \mathrm{m^{-1}}$
4. D.
   $1{\cdot}5 \times 10^{3}\ \mathrm{m^{-1}}$

Tap an option to check your answer.

1. A.
   $\frac{\mathrm{m}}{\mathrm{n}} = c,\ \frac{\beta}{\alpha} \neq c$
2. B.
   $\frac{\mathrm{n}}{\mathrm{m}} = \frac{\alpha}{\beta} = c$
3. C.
   $\frac{\beta}{\alpha} = c,\ \frac{\mathrm{m}}{\mathrm{n}} \neq c$
4. D.
   $\frac{\mathrm{m}}{\mathrm{n}} = \frac{\beta}{\alpha} = c$

Tap an option to check your answer.

1. A.
   $3 \times 10^{8}\ \mathrm{ms^{-1}}$
2. B.
   $2 \times 10^{8}\ \mathrm{ms^{-1}}$
3. C.
   $3{\cdot}3 \times 10^{-9}\ \mathrm{ms^{-1}}$
4. D.
   $5 \times 10^{-9}\ \mathrm{ms^{-1}}$

Tap an option to check your answer.

1. A.
   X-rays
2. B.
   Ultraviolet rays
3. C.
   Infrared rays
4. D.
   Ultrasonic rays

Tap an option to check your answer.

1. A.
   I
2. B.
   II
3. C.
   III
4. D.
   IV

Tap an option to check your answer.

1. A.
   1 nm to $10^{-3}$ nm
2. B.
   400 nm to 1 nm
3. C.
   1 mm to 700 nm
4. D.
   0.1 m to 1 mm

Tap an option to check your answer.

1. A.
   Infrared rays
2. B.
   Ultraviolet rays
3. C.
   X-rays
4. D.
   Microwaves

Tap an option to check your answer.

1. A.
   zero
2. B.
   $\frac{\pi}{4}$
3. C.
   $\frac{\pi}{2}$
4. D.
   $\pi$

Tap an option to check your answer.

1. A.
   $3{\cdot}0 \times 10^{-3}$ T
2. B.
   $3{\cdot}33 \times 10^{-8}$ T
3. C.
   $3{\cdot}0 \times 10^{11}$ T
4. D.
   $3{\cdot}33 \times 10^{-6}$ T

Tap an option to check your answer.

1. A.
   Infrared rays
2. B.
   $\gamma$ rays
3. C.
   UV rays
4. D.
   Visible light rays

Tap an option to check your answer.

1. A.
   $2 \times 10^{4}\ \mathrm{Vm^{-1}}$
2. B.
   $1{\cdot}5 \times 10^{12}\ \mathrm{Vm^{-1}}$
3. C.
   $1{\cdot}8 \times 10^{5}\ \mathrm{Vm^{-1}}$
4. D.
   $0{\cdot}3 \times 10^{4}\ \mathrm{Vm^{-1}}$

Tap an option to check your answer.

1. A.
   have frequency lower than that of ultraviolet radiations.
2. B.
   have wavelength smaller than that of ultraviolet radiations.
3. C.
   move faster than ultraviolet radiations in air.
4. D.
   are mechanical waves but ultraviolet radiations are electro-magnetic waves.

Tap an option to check your answer.

1. A.
   $1{\cdot}8 \times 10^{-5}$ A
2. B.
   $3{\cdot}47 \times 10^{-6}$ A
3. C.
   $8{\cdot}85 \times 10^{-8}$ A
4. D.
   $6{\cdot}32 \times 10^{-4}$ A

Tap an option to check your answer.

1. A.
   Speed : Remains same; Wavelength : Decreases; Frequency : Remains same
2. B.
   Speed : Remains same; Wavelength : Decreases; Frequency : Increases
3. C.
   Speed : Increases; Wavelength : Increases; Frequency : Decreases
4. D.
   Speed : Remains same; Wavelength : Increases; Frequency : Remains same

Tap an option to check your answer.

1. A.
   X-rays, microwaves, UV radiation
2. B.
   X-rays, UV radiation, microwaves
3. C.
   UV radiation, microwaves, X-rays
4. D.
   Microwaves, UV radiation, X-rays

Tap an option to check your answer.

1. A.
   $[\mathrm{M^0 L^1 T^{-1}}]$
2. B.
   $[\mathrm{M^0 L^2 T^{-2}}]$
3. C.
   $[\mathrm{M^1 L^2 T^{-2}}]$
4. D.
   $[\mathrm{M^1 L^{-1} T^1}]$

Tap an option to check your answer.

1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Both Assertion (A) and Reason (R) are false.

Tap an option to check your answer.

1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Both Assertion (A) and Reason (R) are false.

Tap an option to check your answer.

1. A.
   If both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
2. B.
   If both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).
3. C.
   If Assertion (A) is true but Reason (R) is false.
4. D.
   If both Assertion (A) and Reason (R) are false.

Tap an option to check your answer.

1. A.
   Infrared rays
2. B.
   Ultraviolet rays
3. C.
   X-rays
4. D.
   Gamma rays

Tap an option to check your answer.

1. A.
   X-rays
2. B.
   Ultraviolet rays
3. C.
   Infrared waves
4. D.
   Gamma rays

Tap an option to check your answer.

1. A.
   IV
2. B.
   I
3. C.
   III
4. D.
   II

Tap an option to check your answer.

1. A.
   Infrared waves
2. B.
   Ultraviolet rays
3. C.
   Gamma rays
4. D.
   X-rays

Tap an option to check your answer.

1. A.
   Infrared rays
2. B.
   Ultraviolet rays
3. C.
   X-rays
4. D.
   Gamma rays

Tap an option to check your answer.

1. A.
   Infrared rays
2. B.
   Gamma rays
3. C.
   Radio waves
4. D.
   Microwaves

Tap an option to check your answer.

1. A.
   In the same phase and perpendicular to each other.
2. B.
   In the same phase and not perpendicular to each other.
3. C.
   Not in the same phase but are perpendicular to each other.
4. D.
   Neither in the same phase nor perpendicular to each other.

Tap an option to check your answer.

1. A.
   + z direction and in phase with $\vec{E}$
2. B.
   $-$ z direction and in phase with $\vec{E}$
3. C.
   + z direction and out of phase with $\vec{E}$
4. D.
   $-$ z direction and out of phase with $\vec{E}$

Tap an option to check your answer.

1. A.
   J.C. Maxwell
2. B.
   H.R. Hertz
3. C.
   J.C. Bose
4. D.
   G. Marconi

Tap an option to check your answer.

1. A.
   I
2. B.
   IV
3. C.
   II
4. D.
   III

Tap an option to check your answer.

1. A.
   zero
2. B.
   $\pi$
3. C.
   $\dfrac{\pi}{2}$
4. D.
   $\dfrac{\pi}{4}$

Tap an option to check your answer.

1. A.
   1
2. B.
   $\dfrac{1}{c}$
3. C.
   $c$
4. D.
   $\dfrac{1}{c^2}$

Tap an option to check your answer.

1. A.
   moving with a constant velocity
2. B.
   moving with a constant speed parallel to a magnetic field
3. C.
   moving with an acceleration
4. D.
   at rest

Tap an option to check your answer.

1. A.
   Gamma rays
2. B.
   Microwaves
3. C.
   Visible light
4. D.
   X-rays

Tap an option to check your answer.

1. A.
   Infrared waves
2. B.
   Ultraviolet rays
3. C.
   Microwaves
4. D.
   X-rays

Tap an option to check your answer.

1. A.
   $\lambda_{\text{x-rays}} < \lambda_{\text{micro waves}} < \lambda_{\text{radio waves}} < \lambda_{\text{visible}}$
2. B.
   $\lambda_{\text{visible}} > \lambda_{\text{x-rays}} > \lambda_{\text{radio waves}} > \lambda_{\text{micro waves}}$
3. C.
   $\lambda_{\text{radio wave}} > \lambda_{\text{micro waves}} > \lambda_{\text{visible}} > \lambda_{\text{x-rays}}$
4. D.
   $\lambda_{\text{visible}} < \lambda_{\text{micro waves}} < \lambda_{\text{radio waves}} < \lambda_{\text{x-rays}}$

Tap an option to check your answer.

1. A.
   only displacement current exists.
2. B.
   only conduction current exists.
3. C.
   both displacement current and conduction current exist.
4. D.
   no current exists.

Tap an option to check your answer.

1. A.
   Infrared waves
2. B.
   X-rays
3. C.
   Gamma rays
4. D.
   Ultraviolet rays

Tap an option to check your answer.

1. A.
   $\vec{\mathrm{B}}$
2. B.
   $\vec{\mathrm{E}}$
3. C.
   $\vec{\mathrm{E}} \times \vec{\mathrm{B}}$
4. D.
   $\vec{\mathrm{B}} \times \vec{\mathrm{E}}$

Tap an option to check your answer.

1. A.
   Radio waves
2. B.
   Microwaves
3. C.
   X-rays
4. D.
   Infrared waves

Tap an option to check your answer.

1. A.
   $\mu_0 \dfrac{d\phi_{\mathrm{E}}}{dt}$
2. B.
   $\dfrac{1}{\mu_0} \dfrac{d\phi_{\mathrm{E}}}{dt}$
3. C.
   $\varepsilon_0 \dfrac{d\phi_{\mathrm{E}}}{dt}$
4. D.
   $\dfrac{1}{\varepsilon_0} \dfrac{d\phi_{\mathrm{E}}}{dt}$

Tap an option to check your answer.

1. A.
   J.C. Maxwell
2. B.
   J.C. Bose
3. C.
   H.R. Hertz
4. D.
   G. Marconi

Tap an option to check your answer.