Class 11 Physics Revision For NEET 2026 In One Shot By PW

Class 11 Physics can feel difficult to revise when the NEET syllabus includes multiple concepts, formulas and numerical-based questions. With limited revision time, going through every chapter in detail may not always be practical. A one-shot revision can help you revisit the syllabus and focus on concepts that matter for the exam.

Physics Wallah brings Complete Class 11 Physics in One Shot through the NEET 2026 Maharevision session. It covers important concepts from Class 11 Physics along with previous years’ questions (PYQs), helping you refresh key topics and understand their application in NEET-level questions in a single revision session.

Units and Measurements

Units and Measurements form the base for numerical calculations in Physics. Dimensions, errors, significant figures, and measuring instruments such as Vernier Calipers and Screw Gauge require careful attention because small reading or unit errors can affect the final answer.

Important Error Relations

For springs connected in parallel:

Equivalent spring constant: K = K₁ + K₂

Absolute errors are added: ΔK = ΔK₁ + ΔK₂

Percentage error = (ΔK / K) × 100

For springs in series:

1/K = 1/K₁ + 1/K₂

Use the corresponding reciprocal error relation.

For a quantity such as Q proportional to r²/v:

Fractional error = 2(Δr/r) + Δv/v

Memory Tip: The power of a variable becomes the multiplier of its fractional error.

For multiple measurements:

1. Calculate the mean value.

2. Find each absolute deviation from the mean.

3. Calculate mean absolute error.

4. Divide mean absolute error by the mean to obtain relative error.

Significant Figures

Significant-figure rules determine how the final answer should be reported.

• Addition and subtraction use the least number of decimal places.

• Multiplication and division use the least number of significant figures.

• In addition, decimal places are more important than the total count of significant figures.

Measuring Instruments

Questions involving Vernier Calipers and Screw Gauge require attention to least count and zero error.

For a screw gauge:

• Zero above the reference line indicates negative zero error.

• Zero below the reference line indicates positive zero error.

• Correct reading = observed reading − zero error.

For Vernier Calipers:

• Vernier zero to the right of the main-scale zero indicates positive zero error.

Motion in a Straight Line

Motion in a straight line introduces the relationships between position, velocity, acceleration, and time. Questions may involve derivatives, graphs, uniformly accelerated motion, motion under gravity, and relative motion.

For position x as a function of time:

• Velocity is the derivative of displacement with respect to time.

• Acceleration is the derivative of velocity with respect to time.

For the relation v² = kx, compare it with:

v² − u² = 2as

This gives u = 0 and acceleration a = k/2. Hence, the motion is uniformly accelerated.

Distance and Displacement

Distance and displacement must be distinguished whenever the particle changes direction.

For:

x = 8t − t²

Velocity:

v = 8 − 2t

Direction changes when:

v = 0

Turning time = 4 seconds

Position at 4 seconds = 16 metres

Position at 5 seconds = 15 metres

Therefore:

• Displacement from 0 to 5 seconds = 15 metres

• Distance travelled = 17 metres

• Average velocity = 3 metres per second

• Average speed = 3.4 metres per second

Memory Tip: Displacement depends only on initial and final positions. Distance includes the complete path, including any reversal.

For an x-t graph:

• Slope represents velocity.

• Magnitude of slope represents speed.

• A change in slope sign indicates a change in direction.

• Area under an x-t graph does not represent displacement.

Projectile Motion and Relative Motion

Projectile and relative-motion questions require students to resolve motion into components and identify the appropriate reference frame. Range, maximum height, time of flight, river-boat motion, and collision problems each involve specific conditions.

For a projectile:

Range: R = u² sin 2θ / g

Maximum height: H = u² sin²θ / 2g

Time of flight: T = 2u sin θ / g

If range is twice the maximum height:

tan θ = 2

For a horizontal projectile:

Time of flight: t = square root of 2h/g

Range equals horizontal velocity multiplied by time.

• If height becomes four times, time becomes twice.

• If range becomes four times, horizontal velocity must become twice.

For a projectile trajectory:

y = ax − bx²

• Range = a/b

• Maximum height = a²/4b

For river-boat problems:

• Minimum time requires the boat to be directed perpendicular to the river.

• Minimum distance requires the upstream component to cancel the river velocity.

For collision of moving particles, relative velocity must be along the line joining the particles.

Newton’s Laws of Motion

Newton’s laws provide the framework for analysing forces and motion. NEET questions may combine Newton’s laws with friction, impulse, momentum, pulley systems, circular dynamics, and banking of roads.

Friction is especially important because the normal reaction may change according to the applied force.

For a block pulled at an angle on a rough horizontal surface:

1. Resolve the applied force.

2. Find the normal reaction.

3. Calculate friction using f = μN.

4. Apply the condition of constant speed or acceleration.

Block-on-Block Systems

If force is applied to the lower block:

• Maximum common acceleration = μg

• Maximum force = μ(M + m)g

If force is applied to the upper block:

• Maximum acceleration = μmg/M

• Maximum applied force = μm(M + m)g/M

Memory Tip: Identify the block that is accelerated only by friction. Write f = ma for that block first.

For a block against a vertical wall, friction acts opposite to the tendency of motion. Its direction is not decided only by the direction of the applied force.

In a movable pulley:

• The movable pulley is supported by two tensions.

• The free-end acceleration may be twice the pulley acceleration.

• Always apply the string-length constraint.

Work, Energy, Power, and Rotation

Work, energy, and power connect forces with displacement and motion, while circular and rolling motion require energy conservation along with rotational concepts. Questions often depend on identifying the correct component of force and applying the relevant conservation law.

The Work-Energy Theorem states:

Net work = change in kinetic energy.

For a force applied at an angle:

• Work depends on the component along displacement.

• Normal force does zero work when it is perpendicular to displacement.

• Friction usually does negative work.

For constant power:

• Velocity is proportional to square root of time.

• Displacement is proportional to time raised to the power 3/2.

For vertical circular motion:

• At the point of losing contact, normal reaction is zero.

• The limiting condition gives v² = rg cos θ.

• Combining this with energy conservation gives the required height.

For rolling motion:

a = g sin θ / (1 + I/(mr²))

The order of acceleration down the same incline is:

Solid Sphere > Hollow Sphere > Disc > Ring

Rotational Motion

Rotational Motion involves angular quantities and the effect of forces acting at different distances from an axis. Moment of inertia, torque, rotational equilibrium, angular momentum, and rolling motion are important areas for revision.

Use the parallel-axis theorem:

I = Icm + Md²

For a compound pendulum:

T = 2π square root of [(K² + L²)/(gL)]

where K is the radius of gyration about the centre of mass and L is the distance from the suspension point to the centre of mass.

Gravitation

Gravitation covers the motion and interaction of bodies under gravitational force. Important questions involve variation in g, gravitational potential energy, escape speed, orbital motion, and the centre of mass of two attracting bodies.

Escape-speed relation:

v at infinity = square root of (v² − ve²)

For a force law:

F proportional to 1/rⁿ

Then:

T is proportional to r raised to the power (n + 1)/2

For ordinary gravitation, n = 2, so:

T² is proportional to r³

When two bodies attract each other in free space, their centre of mass remains fixed. Therefore:

m₁x₁ = m₂x₂

The lighter body travels a greater distance.

Inside a uniform spherical shell, gravitational potential remains constant:

V = −GM/R

SHM and Waves

Simple Harmonic Motion and Waves involve periodic motion, oscillations, energy relationships, standing waves, beats, string waves, and organ pipes. These topics require attention to amplitude, angular frequency, harmonics, and boundary conditions.

For SHM:

v = ω square root of (A² − x²)

Maximum acceleration = ω²A

Kinetic energy / potential energy = (A² − x²) / x²

For springs:

• Spring constant is inversely proportional to length.

• Parallel spring constants are added.

• Angular frequency of a spring-mass system is square root of k/m.

• Elevator acceleration changes equilibrium extension but not angular frequency.

Important wave topics include standing waves, beats, string waves, and organ pipes.

For waves:

• Intensity is proportional to amplitude squared.

• Maximum particle velocity = Aω.

• A closed pipe supports only odd harmonics.

• First overtone of a closed pipe is the third harmonic.

• For a string fixed at both ends, L = nλ/2.

Thermodynamics, Solids, and Fluids

Thermal and fluid-related concepts connect physical laws with temperature, pressure, heat, flow, and material properties. Questions may involve gas laws, degrees of freedom, calorimetry, buoyancy, continuity, Bernoulli’s equation, and thermal conductivity.

For an ideal gas:

PV = nRT

At constant volume, pressure is proportional to absolute temperature. Always use kelvin for absolute temperature.

For degrees of freedom f:

Gamma = 1 + 2/f

• Rigid diatomic gas: gamma = 7/5

• Vibrating diatomic gas: gamma = 9/7

For mean free path:

• At constant pressure, mean free path is proportional to temperature.

• Collision frequency is proportional to square root of temperature.

Calorimetry

For calorimetry:

Heat required to melt ice = mL

When calculating the heat required to melt ice:

1. First warm ice below zero degrees to zero degrees.

2. Then calculate the heat required for melting.

Fluids

Important fluid relations include:

• Floating condition: weight = buoyant force

• Continuity equation: A₁v₁ = A₂v₂

• Bernoulli’s equation connects pressure, kinetic energy, and gravitational energy.

• For a small hole in an open tank: v = square root of 2gh

For thermal conductivity:

• Series combination uses reciprocal addition.

• Parallel combination uses direct averaging for equal dimensions.

How to Revise Class 11 Physics for NEET 2026

Class 11 Physics contains several interconnected concepts, so revision should combine formula recall with numerical practice. The following approach can help organise revision across mechanics, thermal physics, waves, and measurements.

1. Revise formulas with their conditions: Do not memorise equations separately from the conditions under which they apply.

2. Practise Units and Measurements: Revise dimensions, errors, significant figures, Vernier Calipers, and Screw Gauge carefully.

3. Strengthen mechanics: Practise kinematics, projectile motion, Newton’s laws, friction, work-energy, rotation, and gravitation through numerical questions.

4. Revise recurring comparisons: Keep concepts such as distance versus displacement, minimum-time versus minimum-distance river problems, and different rolling bodies together for quick recall.

5. Practise thermal and wave problems: Revise gas laws, calorimetry, fluids, SHM, standing waves, and organ pipes with their relevant conditions.

6. Use PW resources for question practice: Practise PYQs and MCQs and use Mind Maps, Sample Papers, Formula resources, and YouTube Lectures alongside written numerical practice.

Class 11 Physics revision should focus on key concepts, formulas, conditions, and regular numerical practice across mechanics, gravitation, SHM, waves, thermodynamics, and fluids. PW’s NEET resources, including PYQs, MCQs, Mind Maps, Sample Papers, Formula resources, and YouTube Lectures, can support this revision and question practice.

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