An insulater ared in a transmission line has dierectrie unstant equal to 0.25 What is the velocity factor of the transmission line ?
You've reached today's free limit of 20 questions.
Log in to keep practising for free.
Electromagnetic Waves MCQs for NEET — Physics Questions with Answers
Practice free Electromagnetic Waves (Physics) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
The velocity of e.m. waves in a medium is $ 2.5 \times 10 ^ 8 ms^ {-1}$ what is the dielectric constant of the medium ?
You've reached today's free limit of 20 questions.
Log in to keep practising for free.
How long will it take to transmit the information 30km away in space ?
You've reached today's free limit of 20 questions.
Log in to keep practising for free.
When electromagnetic waves enter the ionised layer of ionosphere, the relative permitting of the ionised layer
You've reached today's free limit of 20 questions.
Log in to keep practising for free.
In which of the following media the wave propagation occurs with out attention ?
You've reached today's free limit of 20 questions.
Log in to keep practising for free.
The dimensional formula of $ l_0 E_0$ is
You've reached today's free limit of 20 questions.
Log in to keep practising for free.
A plane electromagnetic wave is incident on a material surface. The wave delivers momentum P and energy E
You've reached today's free limit of 20 questions.
Log in to keep practising for free.
Explanation
When a plane electromagnetic wave is incident on a material surface, it delivers both momentum and energy. The energy carried by the wave is related to the intensity of the wave, and the momentum is related to the energy by the equation $P = rac{E}{c}$, where $c$ is the speed of light. Therefore, both momentum and energy are non-zero. Hence, the correct option is $P eq 0, E eq 0$.
If $ V_\gamma , V_x and V_m $ are the velocity of the v rays, x rays, micro waves respectively in space, then
You've reached today's free limit of 20 questions.
Log in to keep practising for free.
Explanation
The velocity of electromagnetic waves in a vacuum is the speed of light, which is approximately $3 imes 10^8$ meters per second. This speed is the same for all types of electromagnetic waves, including gamma rays ($V_ ext{γ}$), X-rays ($V_ ext{x}$), and microwaves ($V_ ext{m}$). Therefore, $V_ ext{γ} = V_ ext{x} = V_ ext{m}$.
According to Maxwell, a changing electric field produces
You've reached today's free limit of 20 questions.
Log in to keep practising for free.
Explanation
According to Maxwell's equations, a changing electric field produces a magnetic field. This relationship is described by the Maxwell-Ampère law: $$ abla imes extbf{E} = - rac{ ext{d} extbf{B}}{ ext{d}t}$$ which indicates that a time-varying electric field generates a magnetic field.
An electromagnetic wave going through vaccum is described by $ E= E_o sin (kx - \omega t ) $ Which of the following is independent of the wavelength?
You've reached today's free limit of 20 questions.
Log in to keep practising for free.
Explanation
Ready to ace NEET?
Free access · No credit card required
Frequently Asked Questions
Yes. You can attempt every Electromagnetic Waves question on this page for free without logging in, and check the correct answer with a detailed explanation instantly.
No account is required to attempt questions and view answers. A free account adds bookmarks, personal notes, and progress tracking.
The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.