Competency-Based Questions for Class 11 Physics
Understanding the Concept
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Physical Quantities and Measurements:
- Explain the difference between precision and accuracy with suitable examples.
- How can you reduce the random and systematic errors in a measurement?
- What is the significance of significant figures in a measurement?
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Motion in a Straight Line:
- Distinguish between uniform and non-uniform motion with the help of graphs.
- Derive the equations of motion using graphical method.
- Explain the concept of relative velocity with a real-life example.
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Motion in a Plane:
- Differentiate between projectile motion and uniform circular motion.
- Derive the expression for the time of flight and range of a projectile.
- Explain the concept of centripetal acceleration and its direction.
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Laws of Motion:
- State Newton's laws of motion and give real-life examples.
- Explain the concept of impulse and its application in sports.
- Derive the expression for the acceleration due to gravity.
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Work, Energy, and Power:
- Distinguish between conservative and non-conservative forces.
- Explain the work-energy theorem.
- Derive the expression for the potential energy of a spring.
Applying the Concept
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A car starts from rest and accelerates uniformly for 10 seconds. It then maintains a constant speed for 30 seconds and finally decelerates uniformly to rest in 20 seconds. Sketch the velocity-time graph for the motion of the car.
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A ball is thrown vertically upwards with an initial velocity of 20 m/s. Calculate the maximum height reached by the ball and the time taken to reach
1 the maximum height. -
A block of mass 2 kg is placed on a smooth inclined plane of inclination 30°. Find the acceleration of the block and the force exerted by the plane on the block.
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A simple pendulum of length 1 m has a bob of mass 100 g. The bob is pulled aside through an angle of 60° and released. Find the maximum velocity of the bob.
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A bullet of mass 10 g is fired horizontally with a velocity of 1000 m/s. It embeds itself in a wooden block of mass 990 g suspended by a string. Calculate the vertical height to which the block rises.
Analyzing the Concept
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A satellite is revolving around the Earth in a circular orbit. What is the work done by the gravitational force on the satellite in one complete revolution?
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A body is projected vertically upwards with a certain initial velocity. What is the ratio of the kinetic and potential energies of the body at half the maximum height reached?
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A spring is stretched by a distance x. What is the work done in stretching it further by a distance y?
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A block of mass m is kept on a horizontal rough surface. A force F is applied on the block at an angle θ with the horizontal. What is the condition for the block to move with uniform velocity?
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A person is standing on a rotating platform. What happens to his linear speed and angular speed when he moves towards the center of the platform?
These are just a few examples of competency-based questions for Class 11 Physics. The questions are designed to assess students' understanding of concepts, their ability to apply the concepts to solve problems, and their analytical and critical thinking skills.
Utility of Competency-Based Questions for Class XI Physics
Competency-based questions (CBQs) are a valuable tool for assessing students' understanding of physics concepts and their ability to apply them to real-world situations. Here are some key utilities of CBQs in Class XI Physics:
1. Deep Understanding and Critical Thinking:
- Conceptual Clarity: CBQs encourage students to delve deeper into the underlying concepts rather than simply memorizing formulas and equations.
- Problem-Solving Skills: These questions often require students to analyze complex scenarios, break them down into smaller parts, and apply appropriate problem-solving techniques.
- Critical Thinking: CBQs promote critical thinking by asking students to evaluate information, make judgments, and draw conclusions.
2. Application of Knowledge:
- Real-World Relevance: CBQs often present real-world scenarios, helping students connect theoretical knowledge to practical applications.
- Practical Skills: These questions can assess students' ability to use measuring instruments, conduct experiments, and analyze data.
3. Higher-Order Thinking Skills:
- Analysis and Evaluation: CBQs often require students to analyze data, identify patterns, and evaluate different approaches to problem-solving.
- Creativity and Innovation: Some CBQs may encourage students to think creatively and come up with innovative solutions to problems.
4. Effective Assessment:
- Comprehensive Assessment: CBQs can assess a wide range of cognitive skills, including knowledge, comprehension, application, analysis, synthesis, and evaluation.
- Fair and Reliable Assessment: These questions can be designed to be fair and reliable, reducing the impact of guesswork and memorization.
5. Improved Learning Outcomes:
- Active Learning: CBQs can motivate students to actively engage with the material and participate in discussions.
- Enhanced Learning: By focusing on understanding and application, CBQs can lead to improved learning outcomes.
Example of a Competency-Based Question for Class XI Physics:
- Question: A car starts from rest and accelerates uniformly for 10 seconds. It then maintains a constant speed for 30 seconds before decelerating uniformly to rest in 5 seconds.
- Sketch a velocity-time graph for the car's motion.
- Calculate the acceleration and deceleration of the car.
- Determine the total distance traveled by the car.
This question requires students to:
- Understand the concepts of acceleration, deceleration, and velocity.
- Sketch a velocity-time graph accurately.
- Apply kinematic equations to calculate relevant quantities.
- Analyze the graph to determine distance traveled.
By incorporating CBQs into their assessments, teachers can foster a deeper understanding of physics concepts and prepare students for future challenges.
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