Class 11th physics 2021
SUBJECT: PHYSICS
Class: 11th
MAXIMUM MARKS: 70
TIME :3 Hrs
A. Very Short Answer Type Questions (1x5)
1. If X=5t2 Calculate velocity.
2. Draw X-t graph for free fall.
3. Define the term phase.
4. If Y=4 Sin (5t). Give values of amplitude & angular velocity.
5. What is the dimensional formula for specific heat?
6. Define the following units.
I) Light Year II) Par-Sec.
Or
Define terms
I) Absolute error II) Relative error.
7. Derive V=u+at by calculus method.
8. Steel is more elastic than rubber. Explain.
9. What is the First law of thermodynamics? Explain sign convention also.
10. What is the radius of gyration? Give an expression for it.
B. Short Answer Type Questions (3x12)
11. Derive an expression for the angle of banking on a curved road with certain co-
efficient of friction.
Or
What are the laws of friction?
12. Differentiate Xn
by ab-initio method.
13. Derive an expression for the time period of a simple pendulum using
dimensional analysis.
14. What is the impulse-momentum theorem?
15. What is the co-efficient of resituating? How does 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 the 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 for example.
20. Derive an expression for escape velocity.
(Use the 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 the Isochoric and isobaric process?
Write ist law of thermodynamic equation for all these processes.
C. Value–Based Questions (1x4)
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 the centre of mass.
II) Derive the expression for the position vector of the centre of mass.
D. Long-Answer Type (3x5)
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
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