1. . In electromagnetic waves the phase difference between electric field vector and magnetic field vector is?
(A) 0
(B) 90°
(C) 180°
(D) 60°
2. . Electromagnetic waves are produced by
(A) A static charge
(B) An accelerated charge
(C) A moving charge
(D) Charged particles
3. . The direction in which electromagnetic waves propagate is same as that of
(A) 𝑬 × 𝑩
(B) 𝐵 × 𝐸
(C) 𝐸
(D) 𝐵
4. . Which of the following has a minimum wavelength?
(A) Blue light
(B) Infrared rays
(C) Microwave
(D) Gamma rays
5. . The ultra-high frequency band of radio waves in the electromagnetic wave is used as in
(A) Television
(B) Cellular phone communications
(C) Commercial FM radio
(D) Both a & b
6. . Which of the following electromagnetic wave is used in medicine to destroy cancer cells?
(A) IR-rays
(B) Visible Rays
(C) Gamma rays
(D) Ultraviolet rays
7. . For a perfect dielectric, which parameter will be zero?
(A) Conductivity
(B) Frequency
(C) Permittivity
(D) Permeability
8. . For a lossless dielectric, the attenuation will be
(A) 1
(B) 0
(C) 1
(D) Infinity
9. . In lossy dielectric, the phase difference between the electric field E and the magnetic field H is
(A) 90°
(B) 60°
(C) 45°
(D) 0
10. . The intrinsic impedance is the ratio of square root of
(A) Permittivity to permeability
(B) Permeability to permittivity
(C) Phase constant to wavelength
(D) Wavelength to phase constant
11. . Skin depth phenomenon is found in which materials?
(A) Insulators
(B) Dielectrics
(C) Conductors
(D) Semiconductors
12. . In free space, the charge carriers will be
(A) 0
(B) 1
(C) 100
(D) Infinity
13. . In free space, which parameter will be unity?
(A) Permittivity
(B) Absolute Permittivity
(C) Relative Permittivity
(D) Permeability