JK Bose Class 11 Physics Past Paper 9223-Z 2023 PDF

# Y-23-Z Physics Examination ## Y-23-Z - Roll No. - Total No. of Questions: 26 - Total No. of Printed Pages: 7 - XIARJKUT23 - 9223-Z - PHYSICS ## Time: 3 Hours ## Maximum Marks: 70 ## Section-A ### (Very Very Short Answer Type Questions) - **1 each** 1. If _x_ = _a_ sin θ, _y_ = _b_ cos θ, find...

# Y-23-Z Physics Examination ## Y-23-Z - Roll No. - Total No. of Questions: 26 - Total No. of Printed Pages: 7 - XIARJKUT23 - 9223-Z - PHYSICS ## Time: 3 Hours ## Maximum Marks: 70 ## Section-A ### (Very Very Short Answer Type Questions) - **1 each** 1. If _x_ = _a_ sin θ, _y_ = _b_ cos θ, find _dy_ / _dx_ 2. Can a force change only the direction of velocity without changing its magnitude? If yes, name the situation. 3. Define Plane progressive wave. 4. What are free Oscillations? 5. What do you mean by a thermodynamical reversible process? ## Section-B ### (Very Short Answer Type Questions) - **2 each** 6. What are the dimensions of _a_ & _b_ in the relation: E = b - x² / _at_ where E, x, _I_ represent energy, distance, and time respectively. **OR** Find the percentage error in the area of a rectangular field of length (200 ± ５) m & breadth (50 ± 2) m. 7. Derive relation between torque and angular momentum. 8. Define stress and strain. 9. State zeroth law of thermodynamics. Hence define temperature. 10. The moment of inertia of a hollow sphere about its diameter is (MR²) / 3. What is its radius of gyration about that axis? ## Section-C ### (Short Answer Type Questions) - **3 each** 11. Define angle of repose. Show that the coefficient of friction is equal to the tangent of the angle of repose. **OR** Define centripetal force. Derive the expression for it. 12. Differentiate sin x by ab-initio method. 13. An experiment measures quantities a, b, c, and x as x = abc^-3. The percentage errors in _a_, _b_, _c_ are ±1%, ±3%, and ±2% respectively. Find the percentage error in (X). 14. State Newton's three laws of motion. Show that Newton's second law is the only real law of motion. ## Section-D ### (Value Based Questions) - **4** 23. A man arrived at Delhi Railway Station and wanted to go to his relative's house 10 km away from the station. He hired a taxi to reach the destination. The driver followed a long path 25 km to reach the destination in one hour and charged for 25 km from the man. Now, answer the following: (i) Comment on the behavior of driver. (ii) Calculate the average speed of the taxi. (iii) Calculate the average velocity of the taxi. ## Section-E ### (Long Answer Type Questions) - **5 each** 24: Derive: (i) v = u + at (ii) s = ut + 1/2at² where letters have their usual meanings (Use calculus approach). **OR** Find an expression for the maximum height, time of flight, and horizontal range of a projectile tired at an angle with the horizontal. 25. Define Capillarity. Find an expression for the height of the liquid due to its rise in a capillary tube. **OR** What are various modes of transfer of heat? Discuss them in detail. 26. Derive an expression for the displacement, velocity, and acceleration of a particle executing simple Harmonic motion. **OR** What is Doppler effect? Derive an expression for the general apparent frequency of sound in the Doppler effect. Hence find the expression for the apparent frequency when the source is at rest and the observer is in motion.