Cbse 11 Class Physics Sample Paper Model 1 - http://cbse.edurite.com/cbse-sample-papers/cbse-sample-papers-for-class-11-physics.html

1. PHYSICS
SAMPLE QUESTION PAPER
Class:XI Maximum Marks: 70
Time Duration: 3 hrs No of pages: 3
General Instructions:
Ò All questions are compulsory.
Ò This question paper consists of four sections A, B, C and D. Section A contains 8
questions of one mark each, Section B is of 10 questions of two marks each, Section C is
of 9 questions of three marks each and Section D is of 3 questions of five marks each.
Ò There is no overall choice. However, an internal choice has been provided in one
question of 2 marks, one question of 3 marks and two questions of 5 marks weight age. A
student has to attempt only one of the alternatives in such questions.
Ò Whenever necessary. The diagrams should be neat and properly labeled.
SECTION A (1X8 = 8)
1. Who proposed wave theory of light
2. Define acceleration
3. Explain why does a cyclist bend inwards while riding along a curved roads
4. Estimate the energy associated with 1kg of mass
5. Define Young's module of elasticity
6. Does Archimedes principle hold for a vessel in free fall or in a satellite moving in a circular
orbit?
7. Stainless steel cooking pans are preferred with extra copper bottom. Why?
8. Define temperature
SECTION B (2X10 = 20)
9. If the length and time period of an oscillating pendulum have errors of 1% and 2% respectively,
what is the error in the estimate of g ?
10. Prove that ⃗U AB = ⃗U A - ⃗U B where symbols have there usual meaning
11. How does lubrication helps in friction?
12. How are fast neutron slowed down with the use of moderators?
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2. 13. State two theorems of moment of inertia.
14. What is the height of water column produces the same pressure as a 760mm high column of
mercury?
15. Tea gets cooled when sugar is added to it . Why?
16. What are the limitations of the first law of thermodynamics
17. Find the temperature at which root mean square velocity of a gas is half of its value of 00c,
pressure remaining constant.
18. What is an oscillatory motion
SECTION C (3X9 = 27)
19. If the initial velocity of a particle is u and collinear acceleration at any time t is a is directly
proportional to t. calculate the final velocity of the particle after time t .
20. Two masses m1 and m2 are connected to the ends of a string passing over a pulley. Find the
tension and acceleration associate.
21. An inclined plane θ has its top-most point at a height 'h' prove that the work done a mass to the
ground level either vertically or along the inclined surface is equal and is mgh. Also prove that
the velocity of the mass at the lowermost point is √2gh.
22. Find the moment of a thin rod about an axis perpendicular to it and passing through its midpoint
23. Explain the variation of g with respect to height and depth.
24. A steel wire of length 4.7m and cross section 3.0X10-5m2 stretches by the same amount as a
copper wire of length 3.5m and cross section 4.0X10-5m2under a given load. What is the ratio of
the Young's module of steel to that of copper?
25. State and prove Bernoulli's theorem
26. Draw energy distribution curve for a black body at two different tempertaureT1 and T2 write any
two conclusion that can be drawn from these curves.
27. Derive the expression for resultant spring constant when two springs having constants kx and kg
are connected in a) parallel b) series
SECTION D (5X3 = 15)
28. What is the difference between gravitational potential energy? Drive an expression for
gravitational potential
29. A cylindrical wooden block of cross-section 15.0cm2 and 230 gram is floated over water with
an extra weight 50 gram attached to its bottom. The cylinder floats vertically. From the state of
equilibrium, it is slightly depressed and released. If the specific gravity of wood is 0.3 and g =
9.8ms-2, deduce the frequency of oscillating of the block.
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3. 30. Explain Dooplers effect in sound. Obtain an expression for apparent frequency of sound when
source and listener are approaching each other.
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