Course Content
Class 11 Physics Chapter 1 Physical World
Section Name Topic Name 1 Physical World 1.1 What is physics? 1.2 Scope and excitement of physics 1.3 Physics, technology and society 1.4 Fundamental forces in nature 1.5 Nature of physical laws
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Class 11 Physics Chapter 4 Motion In A Plane
4 Motion in a plane 4.1 Introduction 4.2 Scalars and vectors 4.3 Multiplication of vectors by real numbers 4.4 Addition and subtraction of vectors – graphical method 4.5 Resolution of vectors 4.6 Vector addition – analytical method 4.7 Motion in a plane 4.8 Motion in a plane with constant acceleration 4.9 Relative velocity in two dimensions 4.10 Projectile motion 4.11 Uniform circular motion
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Class 11 Physics Chapter 5 Laws of motion
Section Name Topic Name 5 Laws of motion 5.1 Introduction 5.2 Aristotle’s fallacy 5.3 The law of inertia 5.4 Newton’s first law of motion 5.5 Newton’s second law of motion 5.6 Newton’s third law of motion 5.7 Conservation of momentum 5.8 Equilibrium of a particle 5.9 Common forces in mechanics 5.10 Circular motion 5.11 Solving problems in mechanics
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Class 11 Physics Chapter 6 Work Energy and Power
Section Name Topic Name 6 Work Energy and power 6.1 Introduction 6.2 Notions of work and kinetic energy : The work-energy theorem 6.3 Work 6.4 Kinetic energy 6.5 Work done by a variable force 6.6 The work-energy theorem for a variable force 6.7 The concept of potential energy 6.8 The conservation of mechanical energy 6.9 The potential energy of a spring 6.10 Various forms of energy : the law of conservation of energy 6.11 Power 6.12 Collisions
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Class 11 Physics Chapter 7 Rotation motion
Topics Introduction Centre of mass Motion of COM Linear Momentum of System of Particles Vector Product Angular velocity Torque & Angular Momentum Conservation of Angular Momentum Equilibrium of Rigid Body Centre of Gravity Moment of Inertia Theorem of perpendicular axis Theorem of parallel axis Moment of Inertia of Objects Kinematics of Rotational Motion about a Fixed Axis Dynamics of Rotational Motion about a Fixed Axis Angular Momentum In Case of Rotation about a Fixed Axis Rolling motion
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Class 11 Physics Chapter 9 mechanics properties of solid
Section Name Topic Name 9 Mechanical Properties Of Solids 9.1 Introduction 9.2 Elastic behaviour of solids 9.3 Stress and strain 9.4 Hooke’s law 9.5 Stress-strain curve 9.6 Elastic moduli 9.7 Applications of elastic behaviour of materials
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Class 11 Physics Chapter 11 Thermal Properties of matter
Section Name Topic Name 11 Thermal Properties of matter 11.1 Introduction 11.2 Temperature and heat 11.3 Measurement of temperature 11.4 Ideal-gas equation and absolute temperature 11.5 Thermal expansion 11.6 Specific heat capacity 11.7 Calorimetry 11.8 Change of state 11.9 Heat transfer 11.10 Newton’s law of cooling
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Class 11 Physics Chapter 14 Oscillations
Section Name Topic Name 14 Oscillations 14.1 Introduction 14.2 Periodic and oscilatory motions 14.3 Simple harmonic motion 14.4 Simple harmonic motion and uniform circular motion 14.5 Velocity and acceleration in simple harmonic motion 14.6 Force law for simple harmonic motion 14.7 Energy in simple harmonic motion 14.8 Some systems executing Simple Harmonic Motion 14.9 Damped simple harmonic motion 14.10 Forced oscillations and resonance
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NCERT Solutions for Class 11 Physics Chapter 13 Kinetic Theory

QUESTIONS FROM TEXTBOOK ( Kinetic Theory Notes )

Question 13. 1. Estimate the fraction of molecular volume to the actual volume occupied by oxygen gas at STP.’ Take the diameter of an oxygen molecule to be 3 A.
Answer: Diameter of an oxygen molecule, d = 3 A = 3 x 10-10 m. Consider one mole of oxygen gas at STP, which contain total NA = 6.023 x 1023 molecules

Class 11 Physics Chapter 13 Kinetic Theory Notes & NCERT Solution
Class 11 Physics Chapter 13 Kinetic Theory Notes & NCERT Solution

Question 13. 3. Following figure shows plot of PV/T versus P for 1.00 x 10-3 kg of oxygen gas at two different temperatures.
(a) What does the dotted plot signify?
(b) Which is true : T1> T2 or T1< T2?
(c) What is the value of PV/T where the curves meet on the y-axis?
(d) If we obtained similar plots for 1.00 x 10-3 kg of hydrogen, would we get the same value of PV/T at the point where the curves meet on the y-axis? If not, what mass of hydrogen yields the same value of PV/T (for the low-pressure high-temperature region of the plot) ? (Molecular mass of H2 = 2.02 u, of O2 = 32.0 u, R = 8.31 J mol-1 K-1.)

Class 11 Physics Chapter 13 Kinetic Theory Notes & NCERT Solution
Class 11 Physics Chapter 13 Kinetic Theory Notes & NCERT Solution

Question 13. 4. An oxygen cylinder of volume 30 Hire has an initial gauge pressure of 15 atmosphere and a temperature of 27 °C. After some oxygen is withdrawn from the cylinder, the gauge pressure drops to 11 atmosphere and its temperature drops to 17 °C. Estimate the mass of oxygen taken out of the cylinder. (R = 8.31 J mol-1 K-1, molecular mass of O2 = 32 u.)

Class 11 Physics Chapter 13 Kinetic Theory Notes & NCERT Solution
Class 11 Physics Chapter 13 Kinetic Theory Notes & NCERT Solution
Class 11 Physics Chapter 13 Kinetic Theory Notes & NCERT Solution
Class 11 Physics Chapter 13 Kinetic Theory Notes & NCERT Solution
Class 11 Physics Chapter 13 Kinetic Theory Notes & NCERT Solution
Class 11 Physics Chapter 13 Kinetic Theory Notes & NCERT Solution
Class 11 Physics Chapter 13 Kinetic Theory Notes & NCERT Solution
Class 11 Physics Chapter 13 Kinetic Theory Notes & NCERT Solution

Question 13. 11. A meter long narrow bore held horizontally (and closed at one end) contains a 76 cm long mercury thread which traps a 15 cm column of air. What happens if the tube is held vertically with the open end at the bottom?
Answer:  When the tube is held horizontally, the mercury thread of length 76 cm traps a length of air = 15 cm. A length of 9 cm of the tube will be left at the open end. The pressure of air enclosed in tube will be atmospheric pressure. Let area of cross-section of the tube be 1 sq. cm.
.’. P= 76 cm and V= 15 cm3

Class 11 Physics Chapter 13 Kinetic Theory Notes & NCERT Solution
Class 11 Physics Chapter 13 Kinetic Theory Notes & NCERT Solution

Question 13. 13. A gas in equilibrium has uniform density and pressure throughout its volume. This is strictly true only if there are no external influences. A gas column under gravity, for example, does not have uniform density (and pressure). As you might expect, its density decreases with height. The precise dependence is given by the so-called law of atmospheres n2 = n1 exp [ – mg (h2 – h1)/kBT]
where n2, n1 refer to number density at heights h2 and h1 respectively. Use this relation to derive the equation for sedimentation equilibrium of a suspension in a liquid column :
n2 = n1 exp [ – mg NA(ρ – P) (h2 – h1 )/(ρ RT)] where ρ is the density of the suspended particle, and ρ that of surrounding medium. [NA is Avogadro’s number, and R the universal gas constant.]
[Hint: Use Archimedes principle to find the apparent weight of the suspended particle.]
Answer:  Considering the particles and molecules to be spherical, the weight of the particle is

Class 11 Physics Chapter 13 Kinetic Theory Notes & NCERT Solution
Class 11 Physics Chapter 13 Kinetic Theory Notes & NCERT Solution
Class 11 Physics Chapter 13 Kinetic Theory Notes & NCERT Solution
Class 11 Physics Chapter 13 Kinetic Theory Notes & NCERT Solution
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