9th Class Physics Chapter-wise Exercise Solutions – Punjab Board

1: Physical Quantities and Measurements
This chapter focuses on the foundation of Physics: measurement. It explains physical quantities, their base and derived units, and the importance of the International System of Units (SI). Students learn about the accuracy of measurements, possible errors, and significant figures. Practical tools such as vernier calipers, screw gauge, and stopwatch are also introduced to measure length, diameter, and time with precision.

2: Kinematics
Kinematics deals with motion without considering its causes. This chapter teaches displacement, distance, speed, velocity, and acceleration. Students also learn about different types of motion such as uniform and non-uniform motion. Graphical analysis of motion (distance-time graphs and velocity-time graphs) helps in understanding real-life movements like vehicles, projectiles, and falling bodies.

3: Dynamics
Dynamics is about the causes of motion. This chapter explains the concepts of force, mass, weight, and momentum. Newton’s Three Laws of Motion are discussed in detail with practical applications. Students also study friction, its advantages and disadvantages, and how safety devices like seat belts and airbags are designed using physics principles.

4: Turning Effects of Force
This chapter explains how forces can rotate objects. Key concepts include torque (moment of force), conditions of equilibrium, and center of gravity. Students also learn about stability, balance in structures like bridges and towers, and real-life applications such as levers, seesaws, and cranes.

5: Work, Energy and Power
In this chapter, students understand the concept of work, conditions for work to be done, and its unit (joule). It also explains different forms of energy like kinetic and potential energy, along with the principle of conservation of energy. The chapter further introduces the concept of power, efficiency, and practical applications such as hydroelectric power plants, engines, and machines.

6: Mechanical Properties of Matter
This chapter studies the behavior of matter under forces. Students learn about elasticity, stress, strain, and Hooke’s Law. The chapter also discusses pressure in solids, liquids, and gases, Pascal’s law, Archimedes’ principle, and real-life applications like hydraulic press, brakes, and floating of ships.

7: Thermal Properties of Matter
This chapter focuses on heat and temperature. Students study the expansion of solids, liquids, and gases due to heating. Methods of heat transfer – conduction, convection, and radiation – are explained with daily life examples. The chapter also highlights thermal conductivity, specific heat capacity, and applications like thermometers, refrigerators, and insulation.

8: Magnetism
This chapter deals with natural and artificial magnets, their properties, and uses. It explains magnetic fields, lines of force, and electromagnetism. Students learn about the Earth’s magnetic field, the working of a compass, and applications like electric bells, motors, generators, and MRI machines.

9: Nature of Science
The last chapter highlights the role of science in our daily life. It discusses the scientific method, observation, hypothesis, experimentation, and conclusion. It also explains the relationship between science, technology, and society, along with the benefits and limitations of science in solving global issues like energy crises, climate change, and sustainable development.

9th Class Physics New Book Notes Chapter wise Complete Review.