Physics NEET 2026 flashcards

I have created these flashcards from NEET 2026 3rd may exam

What is the formula for the magnetic field B at the center of a circular coil of n turns

$$B = \frac{\mu_0 \cdot n \cdot I}{2 \cdot R}$$

How is the magnitude of the magnetic moment ($M$) of a circular coil calculated? $M = n I A$

where $n$ is the number of turns and $A$ is the area of the coil.

According to the de Broglie hypothesis

what is the formula for wavelength ($\lambda$)? $\lambda = \frac{h}{p}$

Which physical phenomena provide evidence for the wave nature of light? Diffraction and Interference.

Which experiment demonstrates the particle nature of light? The Compton effect (or the photoelectric effect).

In a velocity-time graph for a ball thrown vertically upward and falling back

what is the value of velocity at the highest point? Zero

What is the formula for the Least Count ($LC$) of a Vernier calliper? $LC = 1\ \text{MSD} - 1\ \text{VSD}$

where MSD is Main Scale Division and VSD is Vernier Scale Division.

What is the resonance frequency ($f$) of a series LCR circuit? $f = \frac{1}{2\pi \sqrt{LC}}$

How does the magnetic field ($B$) vary with distance ($r$) from the axis inside a long

straight

How does the magnetic field ($B$) vary with distance ($r$) outside a long

straight wire? $B \propto \frac{1}{r}$

What is the relationship between the nuclear density of an atom and its mass number ($A$)? Nuclear density is independent of the mass number ($A$).

Formula: Motional EMF ($e$) $e = Bvl$

where $B$ is magnetic field

What is the required shunt resistance ($S$) to convert a galvanometer of resistance $G$ into an ammeter of range $0$ to $I$? $S = \frac{I_g G}{I - I_g}$

where $I_g$ is the full-scale deflection current.

In Young's double slit experiment

if the intensity at path difference $\lambda$ is $K$

What is the resultant acceleration ($a$) of a body of mass $m$ acted upon by two mutually perpendicular forces $F_1$ and $F_2$? $a = \frac{\sqrt{F_1^2 + F_2^2}}{m}$

What happens to the null point in a metre bridge experiment if the positions of the cell and galvanometer are interchanged? There will be no deflection in the galvanometer irrespective of the position of the jockey.

Formula: Average Power ($P$) required to lift a mass $m$ to a height $h$ in time $t$ $P = \frac{mgh}{t}$

How is Compressibility ($C$) related to the Bulk Modulus ($B$)? $C = \frac{1}{B}$

Formula: Poisson's ratio ($\sigma$) $\sigma = -\frac{\Delta d / d}{\Delta L / L}$ (Lateral strain / Longitudinal strain).

A ray of light parallel to the principal axis of a concave lens appears to diverge from which point after refraction? The first principal focus.

What is the moment of inertia of a thin ring of mass $M$ and radius $R$ about an axis passing through its diameter? $I = \frac{1}{2} MR^2$

What is the formula for the phase difference ($\Delta \phi$) between two points separated by distance $\Delta x$ in a wave? $\Delta \phi = \frac{2\pi}{\lambda} \Delta x$

Formula: Angle of deviation ($\delta$) for a prism $\delta = i + e - A$

where $i$ is angle of incidence

In a simple pendulum

the variation of kinetic energy (K.E.) with time ($t$) is represented by what type of trigonometric function? A $\sin^2$ or $\cos^2$ function (periodic with frequency double that of the pendulum).

What is the terminal voltage ($V$) of a battery with EMF $E$ and internal resistance $r$ when a current $I$ flows through it? $V = E - Ir$

What is the work done ($W$) to raise a mass $m$ from the surface of the Earth to a height equal to the radius of the Earth ($R$)? $W = \frac{mgR}{2}$

According to the First Law of Thermodynamics

how are heat ($Q$)

How does the power ($P$) consumed by a resistor change if the voltage ($V$) across it drops

assuming resistance remains constant? $P \propto V^2$

In a free-fall reaction time experiment

how is the distance ($s$) traveled by a ruler related to the reaction time ($t$)? $s = \frac{1}{2} gt^2$

What is the formula for the time period ($T$) of a simple pendulum of length $L$? $T = 2\pi \sqrt{\frac{L}{g}}$

What is the relationship between the peak current ($I_0$) and the RMS current ($I_{\text{rms}}$) in an alternating current? $I_0 = \sqrt{2} I_{\text{rms}}$

How long does it take for an AC current of frequency $f$ to reach its peak value from zero? $t = \frac{1}{4f}$

In interference and diffraction

dark fringes are regions where light energy has been redistributed to bright fringes

What is the maximum horizontal acceleration ($a$) with which a trolley can move such that a box on its floor remains stationary (coefficient of static friction $\mu$)? $a = \mu g$

The volume of a nucleus is directly proportional to which power of its mass number ($A$)? $A^1$ (Linear proportionality).

Formula: Number of revolutions ($N$) completed by a flywheel accelerating from $\omega_i$ to $\omega_f$ in time $t$ $N = \frac{(\omega_i + \omega_f) t}{4\pi}$

What is the formula for absolute pressure ($P$) at a depth $h$ below the water surface? $P = P_{\text{atm}} + \rho gh$

Which device is used to produce Microwaves? Klystron valve or magnetron valve.

How are Gamma rays produced? Radioactive decay of the nucleus.

Which part of the electromagnetic spectrum is produced by the vibration of atoms and molecules? Infra-red rays.

What is the value of the electrostatic field inside a conductor in a static situation? Zero

At the surface of a charged conductor

what is the orientation of the electrostatic field relative to the surface? Normal (perpendicular) to the surface at every point.

In the photoelectric effect

what is the condition for the wavelength ($\lambda$) of incident radiation to give rise to emission? $\lambda \le \lambda_0$

In the Bohr model of the hydrogen atom

how does the radius ($r$) of the electron's orbit depend on the principal quantum number ($n$)? $r \propto n^2$

In a forward-biased p-n junction diode

what happens to the current once the voltage exceeds the threshold voltage? The diode current increases significantly.

What is the relationship between the root mean square speed ($v_{\text{rms}}$) of gas molecules and their molar mass ($M$) at a constant temperature? $v_{\text{rms}} \propto \frac{1}{\sqrt{M}}$

In a circuit with an ideal diode in reverse bias

what is the value of the current flowing through that branch? Zero

Concept: Mass Defect Definition: The difference between the mass of a nucleus and the sum of the masses of its individual constituents.

The _____ of a simple pendulum is the position where its speed is maximum. Equilibrium (mean) position

What is the equivalent capacitance ($C_{eq}$) of two capacitors $C_1$ and $C_2$ connected in series? $C_{eq} = \frac{C_1 C_2}{C_1 + C_2}$

What is the equivalent capacitance ($C_{eq}$) of two capacitors $C_1$ and $C_2$ connected in parallel? $C_{eq} = C_1 + C_2$

The principle that total energy of an isolated system remains constant is the _____. Law of Conservation of Energy

For a travelling harmonic wave $y(x

t) = A \cos(kt - \omega x + \phi)$

Formula: Energy ($E$) of a photon in terms of frequency ($\nu$) $E = h\nu$

In an equilateral prism

if the refracted ray is parallel to the base

What is the potential energy ($U$) of a mass $m$ at a height $h$ near the Earth's surface? $U = mgh$

The _____ is the ratio of lateral strain to longitudinal strain. Poisson's ratio

Which electromagnetic wave has the highest frequency? Gamma rays

Which electromagnetic wave is commonly used in radar systems? Microwaves

What is the value of the electrostatic potential inside a charged conductor? It is constant and equal to the potential at the surface.

Formula: Work function ($\phi$) in terms of threshold frequency ($\nu_0$) $\phi = h\nu_0$

In a p-n junction diode

the current flowing under reverse bias (before breakdown) is called _____. Reverse saturation current

What is the SI unit of power? Watt (W) or Joule per second (J/s).

The sum of kinetic energy and potential energy of a simple pendulum bob is _____ at all points during its motion in the absence of friction. Constant

How is the radius of a nucleus ($R$) related to its mass number ($A$)? $R = R_0 A^{1/3}$

What is the value of the speed of light ($c$) in vacuum in SI units? $3 \times 10^8\ \text{m/s}$ (approximate).

Formula: Angular speed ($\omega$) in terms of frequency ($f$) $\omega = 2\pi f$

In a series LCR circuit at resonance

the impedance of the circuit is equal to _____. The resistance ($R$).

Which factor determines the color of light? Frequency (or wavelength).

Formula: Torque ($\tau$) on a body with moment of inertia $I$ and angular acceleration $\alpha$ $\tau = I\alpha$

In a _____ circuit

the output is only half of the input cycle of an AC signal. Half-wave rectifier

What is the phase difference between current and voltage in a purely resistive AC circuit? Zero

What is the unit of magnetic flux? Weber (Wb)

Concept: Significant Figures The number of digits in a measurement that are known with certainty plus one uncertain digit.

In a nuclear reaction

the total _____ number and total charge are always conserved. Mass (nucleon)

The efficiency of a heat engine is defined as the ratio of _____ to the heat absorbed from the source. Work done

What is the value of the Boltzmann constant ($k_B$)? $1.38 \times 10^{-23}\ \text{J/K}$

In a concave lens

an object placed at infinity will form an image at the _____. Focus ($F$)

The _____ effect is the shifting of the wavelength of light when it is scattered by electrons. Compton

What is the unit of electric potential? Volt (V)

In circular motion

the acceleration directed towards the center is called _____ acceleration. Centripetal

Formula: Kinetic Energy ($KE$) of a rotating body $KE = \frac{1}{2} I \omega^2$

What is the relationship between the focal length ($f$) and radius of curvature ($R$) of a spherical mirror? $f = \frac{R}{2}$