  ## NCERT Solutions for Class 11 Physics

Physics is often one of the most dreaded subjects by students. However, if approached correctly it can soon turn to be of the easiest and most enjoyable subject. Not only can you score well in Physics but it can awaken a lifelong love for the sciences. So it is very important that the student take the correct approach while studying a conceptual subject like physics. Here we have the NCERT Solutions for Class 11 Physics to help you with this process.

Every single function of our life is actually governed by some law or concept of physics. It is said that physics can actually explain everything from the beginning of the universe to life in the present. In class 11 students are introduced with some basic concepts and laws of physics. We will be covering important chapters such as units of measurements, motion in a plane and straight line, gravitational force, kinetic energy, etc.

So accordingly our subject matter experts have formulated these chapter-wise NCERT Solutions for Class 11 Physics. They have comprehensive explanations, solved examples and will even help students with conceptual clarity. With these expertly curated NCERT Solutions for Class 11 Physics, all the student’s doubts and queries will be cleared.

### CBSE Class 11 Physics Chapter-wise NCERT Solutions #### Chapter 1 – Physical World

In this chapter, we focus on the core concepts and the foundation of physics. We are introduced to various theories by world-famous physicians from around the globe like Newton, Faraday, Ampere, etc.

#### Chapter 2 – Units and Measurement

Here students are introduced to the international system of units and its history. They will learn about concepts such as base units and derived units. There are also numerical problems regarding volume and surface area of objects.

#### Chapter 3 – Motion in a Straight Line

This is the introduction of Kinetics. We will learn about rectilinear motion, reference points, path lengths, relative velocity, acceleration, and other such interesting concepts. There are also some basic mathematical problems for the students to practice.

#### Chapter 4 – Motion in a Plane

Students will learn about the differences between scalar and vector quantities. The chapter covers topics such as equality, addition, and multiplication of vectors, angular frequency and velocity, displacement and more.

#### Chapter 5 – Law of Motion

This chapter further explains the motion of an object and the effect external forces can have on it. We will learn about the direction and magnitude of the force and the effects of gravitation. There are numerical problems and graphical representation to calculate the time and speed of moving objects.

#### Chapter 6 – Work, Energy, and Power

In previous classes, students have already studied the concepts of energy, power, and work. Here we will study the relationship between them. We will also learn about scalar products and their laws.

#### Chapter 7 – Systems of Power and Rotational Motion

In this chapter, we learn the theoretical concept of rotational motion and also the mathematical method of its calculation. The NCERT solutions will make the concepts clear and deepen the students understanding of the chapter.

#### Chapter 8 – Gravitation

The basics of gravitation are pretty clear to students by class 11. Now they learn more nuanced concepts such as the universal law of gravitation, gravitational constant, Kepler’s Law, escape speeds, earth satellites, etc. There are also problems for the calculation of time, speed, distance with regards to gravitation.

#### Chapter 9 – Mechanical Properties of Solids

Here students will learn about certain common physical properties of solids such as density, elasticity, tensile strength, volume strain, etc. We will see the real-life applications of certain solids such as steel and copper.

#### Chapter 10 – Mechanical Properties of Fluids

This chapter includes the physical or mechanical properties of both liquids and gasses. It focuses on how fluids behave differently and various different environmental conditions. There are some basic numerical problems and the application of Bernoulli’s equation.

#### Chapter 11 – Thermal Properties of Matter

In this chapter, we will learn the concept and definitions of heat and temperature. We will learn how different matter behaves differently when the heat is applied to it. There are some mathematical problems about the conversion of celsius and kelvin.

#### Chapter 12 – Thermodynamics

This chapter introduces the students to thermodynamics, which is the study of heat and conversion of heat into other energy. We will learn about the laws of thermal energy with some great examples.

#### Chapter 13 – Kinetic Energy

We will study the various scientists studying kinetic theory since the 19th century – Newton, Issac, Maxwell, Boyle, and their findings. Students will also study the behavior of gasses and their fast-moving molecules.

#### Chapter 14 – Oscillations

Students will study in detail about oscillations and oscillatory motion. They will need to learn about periodic motion and harmonic motion and problems regarding them as well as their graphical representation.

#### Chapter 15 – Waves

This chapter focuses on the movement of waves along with important terms and concepts such as transverse waves, longitudinal waves, wavelength. angular wavenumber, the reflection of waves, etc.

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Along with the NCERT Solutions for Class 11 Physics, Toppr provides its students with hundreds of videos, thousands of practice questions and other such invaluable materials. This will help students clear their concepts, solve their doubts, practice numerical problems all from the comfort of their home. With the right tools at their disposal, students are ensured of a good result.

Solved Questions For You:

Question 1. In order that the heat flows one part of a solid to another part, what is required?

1. uniform density
4. uniform temperature

Answer: As heat flows from higher temperature to lower temperature, so a temperature gradient is required.

Question 2. How much work can be obtained from 100 calories of heat energy?

1. 100J
2. 420J
3. 42J
4. 4200J

1 calorie = 4.2J
∴ Work done = heat obtained in calories × 4.2
or w =100 × 4.2 = 420J

Question 3. There is a hole in the middle of a copper plate when heating the plate, the diameter of the hole would:

1. always increase
2. always decrease
3. remain the same
4. none of these

Answer: A metal expands on heating. If a hole is made in the metal plate, the hole will also expand due to the expansion of the material. It can be explained by considering the air in the region of the hole and that air will also expand on heating. Therefore, the diameter of the hole increases always.

Question 4: Choose the correct statements from the following:

This question has multiple correct options

1. All bodies emit thermal radiations at all temperatures.
2. Thermal radiations are electromagnetic waves.
3. Thermal radiations are not reflected from a mirror
4. Thermal radiations travel in free space with the velocity of light

Answer: A body absorbs and emits thermal radiations at all temperatures except absolute zero, hence option  is incorrect.
Thermal radiations like all forms of radiation are electromagnetic in nature. Hence option  is correct.
All electromagnetic radiations reflect off mirrors, hence option  is incorrect.
All the electromagnetic radiation like thermal radiations travel with the velocity of the speed of light. Hence option  is correct.

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