Blog Log in Get Started Free

Physics MCQs for NEET — Practice Questions with Answers

Practice free Physics NEET multiple-choice questions online with instant answers and detailed explanations. No login required.

All Physics Chemistry Botany Zoology

Chapter Language Difficulty Show only questions I answered incorrectly Register free to filter questions

● ● ● ● ●

In an electromagnetic wave, the direction of the magnetic field induction $\vec{B}$ is

parallel to electric field $\vec{E}$

perpendicular to electric field $\vec{E}$

antiparallel to Poynting vector $\vec{S}$

random

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

Magnetic field and electric field are mutually perpendicular to each other as well as to the direction of wave

● ● ● ● ●

In an electromagnetic wave

Power is transmitted along the magnetic field

Power is transmitted along the electric field

Power is equally transferred along with the electric and magnetic fields

power is transmitted in a direction perpendicular to both the fields

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

power is transmitted in a direction perpendicular to both the fields.

● ● ● ● ●

For any E.M. wave if E = 100 V/m and B = 3.33 $\times 10^{- 7}$ . Then the rate of energy flow per unit area is

$3.33 \times 10^{- 5} J / m^{2}$

26.5 W/ $m^{2}$

$3 \times 10^{8} J / m^{2}$

None of these

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

$S_{0} = E_{0} \times H_{0} = 100 \times 0.265 = 26.5 W / m^{2}$

● ● ● ● ●

A variable frequency AC source is connected to a capacitor. Then on increasing the frequency

Both conduction current and displacement current will increase

Both conduction current and displacement current will decrease

Conduction current will increase and displacement will decrease

Conduction current will decrease and displacement current will increase

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

Both conduction current and displacement current will increase.

● ● ● ● ●

Source of an electromagnetic wave is

A charge moving with constant velocity

A charge at rest

A charge moving in a circular orbit

Charges cannot produce an EM wave

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

Electromagnetic waves are produced by accelerated charged.

● ● ● ● ●

The dimension of E/H is that of

Impedance

Inductance

capacitance

Inductance $\times$ Capacitance

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

$D i m e n s i o n o f \frac{E}{H} = \frac{V / m}{A / m} = \frac{V}{A} = u n i t o f i m p e d e n c e$

● ● ● ● ●

Poynting vector $\vec{P}$ for an EM wave is :

$\vec{P} = \vec{E} \times \vec{B}$

$\vec{P} = \vec{E} \times \vec{H}$

$\vec{P} = \frac{\vec{E}}{\vec{B}}$

$\vec{P} = \frac{\vec{E}}{\vec{H}}$

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

Poynting vector $\vec{P}$ is given by $\vec{P} = \vec{E} \times \vec{H}$ .

● ● ● ● ●

Which one statement is incorrect about the electromagnetic waves?

$\vec{E} \times \vec{B}$ gives always the direction of propagation

$\vec{E}$ is always perpendicular to $\vec{B}$

Transverse in nature

$\vec{E}$ is always parallel to $\vec{B}$

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

$\vec{E} i s a l w a y s p e r p e n d i c u l a r t o \vec{B} .$

● ● ● ● ●

Instantaneous displacement current of 2.0 A is set up in the space between two parallel plates of 1 $μ F$ capacitor. The rate of change in potential difference across the capacitor is-

$3 \times 10^{6} v / s$

$4 \times 10^{6} v / s$

$2 \times 10^{6} v / s$

none of these

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

$I_{D} = ε_{0} \frac{{dϕ}_{E}}{dt} = ε_{0} \frac{d (EA)}{dt} = ε_{0} \frac{A}{d} \frac{d (V)}{dt} = C \frac{dV}{dt} \frac{dV}{dt} = \frac{2}{10^{- 6}} = 2 \times 10^{6} V / \sec$

● ● ● ● ●

Which of the following have zero average value in a plane electromagnetic wave?

electric field

magnetic field

magnetic & electric field both

none of these

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

Both magnetic as well as electric fields in EM waves are sinusoidal in nature and we know that the average value of the sinusoidal wave is zero. Hence, both magnetic and electric fields have zero average value in a plane EM wave.

Ready to ace NEET?

Free access · No credit card required

Browse All Questions Create Free Account

Frequently Asked Questions

Yes. You can attempt every Physics 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.