**JAMMU & KASHMIR BOARD OF SCHOOL EDUCATION**

** जम्मू और कश्मीर स्कूल शिक्षा बोर्ड**

** New Model Paper of 11th Class Physics**

** For 2022-2023 Exams with new pattern**

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**SUBJECT: PHYSICS**

**Class : 11th**

**MAXIMUM MARKS: 70**

**TIME :3 Hrs**

**A. Very Short Answer Type Questions (1×5)**

**1. If X=5t² Calculate velocity.
**

Given, x = 5t²

v = dx/dt

v = d(5t²)/dt

v = 10t

**2. Draw X-t graph for free fall.
**

**3. Define the term phase.**

In Physics, the phase is defined as the position of a point in time on a cycle of a waveform. A complete cycle that is 360 degrees is defined as the phase.The phase is expressed in terms of radians. One radian of phase is 57.3 degrees approximately.

**4. If Y=4 Sin (5t). Give values of amplitude & angular velocity.**

Amplitude= 4, angular velocity=5

Explanation:

In linear SHM,

y=A sin (wt), where A=amplitude and w= angular velocity

in given equation, y = 4sin(5t)

hence, Amplitude =4 and angular velocity =5

**5. What is dimensional formula for specific heat?**

The specific heat s is the amount of heat Q per unit mass m required to raise the temperature θ by one degree Celsius.

**6. Define following units.**

**I) Light Year II) Par-Sec.**

Light Year: the distance that light travels in one year, about 9.4607×1012 kilometres

प्रकाश वर्ष; एक वर्ष में प्रकाश द्वारा तय की जाने वाली दूरी जो लगभग 9.4607×1012 किलोमीटर होती हैl

Par-sec: The parsec is a unit of length used to measure the large distances to astronomical objects outside the Solar System. One parsec is approximately equal to 31 trillion kilometres or about 3.26 light-years. One parsec is the distance to an object whose parallax angle is one arcsecond.

** Or**

** Define terms**

**I) Absolute error II) Relative error.**

ABSOLUTE, RELATIVE, AND PERCENT ERROR

- The actual error from the true value is called the absolute error.
- The relative error is the absolute error divided by total quantity. In the case

Of volume, Δv/v

- The percentage error is the relative error multiplied by 100.

**7. Derive V=u+at by calculas method.**

**8. Steel is more elastic than rubber. Explain.**

##### $Hint :$ A body is said to be more elastic if it returns to its original configuration faster than others.

**9. What is First law of thermodynamics? Explain sign convention also.**

**10. What is radius of gyration? Give an expression for it.**

**B. Short Answer Type Questions (3×12) **

**11. Derive an expression for angle of banking on a curved road with certain co- **

**efficient of friction. **

** Or **

**What are laws of friction? **

**12. Differentiate x^{n }**

**by ab-initio method.**

**13. Derive an expression for the time period of simple pendulum using ****dimensional analysis.**

**14. What is impulse momentum theorem? **

**15. What is co-efficient of restitution? How it explains elastic and inelastic ****collision?**

**16. Show that total mechanical energy remains constant when a body is ****dropped from some height.**

**17. What is kinetic interpretation of temperature? Derive Kinetic energy in ****terms of temperature.**

**18. Calculate degrees of freedom for: **

**a) Monatomic b)Di atomic gas **

**19. Differentiate longitudinal & transverse waves with example. **

**20. Derive expression for escape velocity.**

**(Use law of conservation of energy) **

**21. Calculate the change in the value of acceleration due to gravity when a ****body is taken from surface to height “h”.**

**22. What is Isochoric and isobaric process? **

**Write 1st law of thermodynamic equation for all these processes. **

**C. Value –Based Questions (1×4) **

**23. If m1 and m2 are the masses constituting the rigid body, bound by some **

**internal forces so that the distance between the masses remain constant ****then**

**I) Define centre of mass. **

**II) Derive expression for position vector of centre of mass. **

** D. Long-Answer Type (3×5) **

**24. Derive the expression for path/trajectory time of flight (T) and horizontal **

**range(R) when a body is projected from a certain height in the direction of **

**horizontal. **

** Or **

**What is centripetal acceleration? Derive expression for it? **

**25. Discuss S.H.M as a special case of circular motion and derive the **

**expression for displacement and velocity of a body executing S.H.M **

** Or **

**Derive the expression for the displacement of a transverse progressive **

**wave. **

**26. Discuss and derive Bernoulli’s equation. **

** Or **

**What are the modes of heat transfer? Discuss **

**I) Conduction II) Convection & Radiation**