- CH.PHYSICS

# lesson wise important questions for class 11 students

__Units and Measurements__

__Units and Measurements__

1. **Explain parallax method to measure the largest distances. **

**2. Explain how diameter of a planet can be measured.**

**3. How to estimate the small distances? Explain a scientific method. **

**4. Define the terms Accuracy, precision and error. **

**5. What is an error? Explain their types. **

**6. How to measure the magnitude of an error? Give different methods to measure the magnitude of error. **

**7. Define the term significant figure.**

**8. What is dimensional formula? What are its applications? Explain each with an example.**

**9. Explain about fundamental forces in nature.**

__Motion in a Straight Line__

__Motion in a Straight Line__

1. **Define the following terms. **

**a. Distance **

**b. Displacement**

**c. Uniform motion**

**d. Average speed**

**e. Average velocity**

**f. Instantaneous speed**

**g. Instantaneous velocity. **

**h. Acceleration**

**2. Derive kinematic equations for uniformly accelerated motion. **

**3. Derive the equations for maximum height achieved by an object and time of flight. **

**4. Define the term relative velocity. Give an example and explain. **

**5. Discuss various possibilities of s-t graph, v-t graph and a-t graph. **

__Motion in a plane__

__Motion in a plane__

1. **Define the terms scalar and vector. Give examples for each. **

**2. Explain different properties of vector addition and subtraction. **

**3. How to resolve a vector. Explain with an example. **

**4. Define Scalar product (Dot product) and vector product(Cross product)**

**5. Discuss vector addition in detail. And hence prove parallelogram law. **

**6. Using vector notation, define velocity and acceleration. **

**7. Explain the motion of a particle using vector notation. **

**8. Define projectile. Explain its motion using a graph. Define the set of equations for its position and velocity. And hence prove that its path is parabola. **

**9. Derive the equations for time of flight, maximum height achieved by a projectile and range. **

**10. Define circular motion. Find an equation to calculate the acceleration of an object, which is in uniform circular motion. Show that it is directed towards centre of orbit. **

__Laws of motion__

__Laws of motion__

1. **What is law of inertia? Explain Newton’s I law of motion. **

**2. Define momentum. Explain Newton’s II law of motion. **

**3. Discuss the relation between force acting on an object and its momentum **

**4. Discuss the relation between force acting on an object and its acceleration. **

**5. Define impulse. Give its units and dimensional formula. **

**6. Explain Newton’s III law of motion. **

**7. Explain the law of conservation of momentum. **

**8. Define equilibrium. Explain the conditions to maintain a particle in equilibrium condition. **

**9. What is force? Explain the types of force. **

**10. Define friction. What is its importance/limitations. Explain different types. **

**11. Explain the motion of a car in curved road. What are the forces acting on the car? What one we do in order to reduce the centrifugal force acting on this vehicle?**

**12. Explain the banking of roads. Why t is important? Derive an equation for maximum velocity of a vehicle in a curved road. **

**Work, Energy and Power**

**Work, Energy and Power**

1. **Define the term work. Give its unit. **

**2. Explain Kinetic energy of a particle. **

**3. Explain the work energy theorem. **

**4. Derive an equation for work done by a variable force.**

**5. Explain the work energy theorem for a variable force. **

**6. Define the term potential energy. **

**7. Explain the conservation of mechanical energy. Give any two examples. **

**8. Explain the behavior of a spring under the influence of a force F. Derive an equation for its potential energy. Explain the energy-displacement curve.**

**9. Explain the various forms of energy. Define the term power. Give its different units. **

**10. Define collision. Explain elastic one dimensional collision. **

**11. Explain elastic two dimensional collision. **

**12. Explain in-elastic two dimensional collision. **

**13. Explain in-elastic one dimensional collision.**

__System of Particles and Rotational Motion__

__System of Particles and Rotational Motion__

1. **Define rigid body. Give examples. **

**2. Define**

** **

**a. Angle **

**b. Angular velocity**

**c. Angular acceleration **

**d. Translational motion**

**e. Rotational motion **

**f. Rolling **

** **

**3. Define centre of mass. Give the set of equations for CM in 3-dimensional space. **

**4. Give the position vector equation for CM in 3-dimensional space. **

**5. Using an example, explain the motion of centre of mass. **

**6. Find an expression for the linear momentum of system of particles. Show that it is Newton’s II law of motion for extended particles.**

**7. Find a relation between angular velocity and linear velocity. **

**8. Define **

**a. Momentum**

**b. Angular momentum **

**c. Torque **

**d. Force **

**9. Define Moment of force. Write an equation for it. **

**10. Discuss the angular momentum of a particle and system of particles. **

**11. Discuss the “law of conservation of linear momentum”**

**12. Discuss the “law of conservation of angular momentum”**

**13. What is equilibrium state of a body? Write the set of equations to represent this equilibrium state. **

**14. Discuss the principle of moments. And derive a relation between load and effort. **

**15. Define centre of gravity. Explain how one can determine the CG of an irregular object. **

**16. Define moment of inertia. Give a general equation for it. Write its units. **

**17. State**

**a. Theorem of parallel axes**

**b. Theorem of perpendicular axes. **

**18. Write the equations for moment of inertia of **

**a. Thin circular ring (axis through centre)**

**b. Thin circular ring (axis through diameter)**

**c. Thin rod ( axis at its mid-point)**

**d. Thin disc (axis at the centre)**

**e. Thin disc (axis through diameter)**

**f. Hallow cylinder (axis of cylinder) **

**g. Solid cylinder ( axis of cylinder)**

**h. Solid sphere (axis through centre) **

**19. Explain rolling motion. Write an equation for kinetic energy of a rolling object. **

__GRAVITATION__

__GRAVITATION__

1. **State and explain Kepler’s laws of planetary motion. **

**2. Show that areal velocity of a planet is constant. **

**3. State Newton’s universal law of gravitation. **

**4. What is central force? **

**5. How the acceleration due to gravity varies at different regions on Earth’s surface. **

**6. Explain the variation of acceleration due to gravity with height. **

**7. Write short notes on gravitational potential energy. **

**8. Define escape speed and orbital velocity. Write an expression for each. **

**9. What is earth satellite? Derive an equation for time period of such satellite. **

**10. Show that square of time period of a satellite is proportional to cube of its orbital radius. **

**11. Derive an equation for energy of an orbiting satellite. **