लाइव पेपर डेमो

Q.1: Household remote control switches generally use which type of electromagnetic radiation?

A) Ultraviolet rays B) X-rays C) Infrared waves D) Radio waves

Q.2: Which of the following electromagnetic waves has the longest wavelength?

A) Infrared waves B) Gamma rays C) Radio waves D) Ultraviolet waves

Q.3: The ratio of the amplitude of the electric field ($E_0$) to the amplitude of the magnetic field ($B_0$) in a vacuum is equal to:

A) The speed of light B) The reciprocal of the speed of light C) The impedance of free space D) Unity

Q.4: The direction of propagation of an electromagnetic wave is given by the direction of which vector?

A) $\vec{E}$ B) $\vec{B}$ C) $\vec{B} \times \vec{E}$ D) $\vec{E} \times \vec{B}$

Q.5: Which of the following radiations is responsible for keeping the Earth warm via the greenhouse effect?

A) Gamma rays B) Ultraviolet rays C) Visible light D) Infrared waves

Q.6: Electromagnetic waves are transverse in nature. This is directly demonstrated by which phenomenon?

A) Interference B) Diffraction C) Polarization D) Reflection

Q.7: Who theoretically predicted the existence of electromagnetic waves?

A) Heinrich Hertz B) James Clerk Maxwell C) Guglielmo Marconi D) Isaac Newton

Q.8: Which radiation is commonly used to study the crystal structure of solids?

A) Radio waves B) Infrared waves C) X-rays D) Microwaves

Q.9: When an electromagnetic wave travels from a vacuum into a glass medium, which of its properties remains unchanged?

A) Velocity B) Wavelength C) Frequency D) Amplitude

Q.10: What is the speed of electromagnetic waves in a vacuum?

A) $3 \times 10^8\text{ m/s}$ B) $3 \times 10^6\text{ m/s}$ C) $340\text{ m/s}$ D) Depends on the frequency

Q.11: Which of the following properties is NOT shared by all electromagnetic waves in a vacuum?

A) They are transverse in nature. B) They travel with the same speed. C) They have the same wavelength. D) They carry energy and momentum.

Q.12: What type of electromagnetic radiation is emitted during radioactive decay of unstable atomic nuclei?

A) Gamma rays B) Microwaves C) Ultraviolet rays D) Radio waves

Q.13: Which component of the electromagnetic spectrum is used in radar systems for aircraft navigation?

A) Infrared waves B) Microwaves C) X-rays D) Ultraviolet rays

Q.14: Which of the following expressions correctly relates the speed of light $c$ to the permeability $\mu_0$ and permittivity $\varepsilon_0$ of free space?

A) $c = \mu_0 \varepsilon_0$ B) $c = \frac{1}{\mu_0 \varepsilon_0}$ C) $c = \frac{1}{\sqrt{\mu_0 \varepsilon_0}}$ D) $c = \sqrt{\frac{\mu_0}{\varepsilon_0}}$

Q.15: Which of the following waves do not require a material medium for their propagation?

A) Sound waves B) Electromagnetic waves C) Ultrasonic waves D) Water waves

Q.16: The modification made by Maxwell to Ampere's Circuital Law introduced which of the following terms?

A) Conduction current B) Displacement current C) Eddy current D) Alternating current

Q.17: Large exposure to which radiation from the sun causes tanning and sunburns on human skin?

A) Visible light B) Infrared rays C) Ultraviolet rays D) Microwaves

Q.18: In an electromagnetic wave, what is the angle between the electric field vector $\vec{E}$ and the magnetic field vector $\vec{B}$?

A) $0^\circ$ B) $45^\circ$ C) $90^\circ$ D) $180^\circ$

Q.19: What part of the electromagnetic spectrum can be detected by the human eye?

A) Ultraviolet rays B) Visible light C) Infrared light D) X-rays

Q.20: What is the source of an electromagnetic wave?

A) A stationary charge B) A charge moving with a constant velocity C) An accelerating or oscillating charge D) A neutral particle at rest

8. Electromagnetic Waves 112 (डेमो)

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