II PUC Physics-33
Model paper 2
Time: 3hrs,15min
Max marks: 90
Instructions: 1. Numerical problems solved with out writing the relevant formula carry no marks
2. Answers with out relevant diagram/fig/circuit wherever necessary will not carry any marks.
PART-A
I Answer all of the following questions : 10x1=10
1. What is dispersion?
2. What are coherent sources?
3. Mention condition for first minimum in diffraction pattern.
4. What is the value of speed of light obtained in Michelson’s experiment?
5. Calculate the number of electrons to be removed to charge a body by 1nC.
6. Write the SI unit of current density.
7. Does a moving neutron experiences force in a magnetic field?
8. What is flash spectrum?
9. What is the basic function of transistor?
10. Write the circuit symbol of XOR gate.
PART-B
II. Answer any ten of the following questions: 10x2=20
11. What are the conditions for a pair of thin prisms to produce dispersion without deviation?
12. Name the theories of light in support of its wave nature.
13. Calculate the resolving power of a telescope whose limit of resolution is 2.44X10 -6 rad.
14. State & explain Gauss’ theorem.
15. Write the expression for capacitance of cylindrical capacitor and explain the terms.
16. State Kirchhoff’s laws.
17. What is meant by magnetic dipole moment of current loop? Write its SI unit.
18. Define the terms retentivity and coercivity.
19. Arrive an expression for de Broglie wavelength .
20. Why does ocean appears deep blue in colour?
21. Write the quark models of proton and neutron.
22. What are thermo tropic and lyotropic crystals.
PART-C
III. Answer any one of the following questions: 1 x 5=5
23. Derive lens maker’s formula.
24. State Brewster’s law .show that the reflected and refracted rays are normal to each other at polarizing angle of
incidence.
IV. Answer any two of the following questions: 2x5=10
25. Derive the expression for magnetic field at a point along the axis of a circular coil carrying Current.
26. Describe an expression for the force between two parallel straight conductors carrying current and hence
define ampere.
27. What is photoelectric effect? Mention any four experimental observations on photoelectric effect.
V. Answer any two of the following questions: 2x5=10
28. Explain any five characteristics of atomic nucleus.
29. State decay law. Show that N= N0e- λt for a radioactive element.
30. What is rectification? With a neat circuit diagram, explain the construction & working of half wave rectifier
along with suitable waveforms.
VI. Answer any three of the following questions: 3x5=15
31. Find the real position of an air bubble in a glass cube of side 0.3m if the bubble appears to be at a distance of
0.05m from one face and at 0.15m from the opposite face and also RI of the material of glass cube.
32. ABCD is a square 1m. Point charge of +2 X 10-10 C , - 4 X 10-10 C and 8 X 10-10 C are placed at corner A, B, C
respectively. Calculate the work done in transferring a charge of 10μc from D to the point of intersection of
diagonals.
33. An A.C source of 250 B ,50Hz is connected to a circuit consisting of an electric lamp rated 100W,50B and a
capacitor in series.What should be the capacity of a capacitor to work the lamp with the rated value?
34. Calculate the velocity of a photoelectron emitted when the light of frequency 3X10 12 Hz is incident on a metal
surface of threshold; frequency 2X1012 Hz. Given: h=6.625X10-34 Js and me =9.1X10-31kg
VII. Answer any one of the following questions: 1 × 5 =5
35. Describe an experiment to determine refractive index of material of given convex lens by finding its focal length
by shift method ( given the radii of curvatures as R1 and R2 ).
36. Describe an experiment to determine the reduction factor of the tangent galvanometer and hence to calculate
BH at a given place.
VIII. Answer any one of the following questions: 1 × 5 =5
37. Determine the resistivity of the material of the given wire using the following data :
Length of the wire = 0·26 m
Diameter of the wire = 0·63 × 10-3 m
Trial no. Resistance in the right gap (Ω) Balancing length (m)
1 1 0.42
2 2 0.29
38. Calculate the self-inductance of the coil by direct method using the following data: (frequency of AC=50 Hz)
Trial No. DC part AC part
Reading
Voltmeter Ammeter Voltmeter Ammeter
reading reading reading reading
1 1.5 25×10-3 2.5 26×10-3
2 1.9 36×10-3 3.0 29×10-3
PART – D
IX. Answer any one of the following questions: 1×10=10
39. a) In young’s double-slit experiment the two slits 0.18mm apart the illuminated by light of wavelength 589.3nm.
Calculate the distance of (i) 5th bright and (ii) 3rd dark fringe from the mid-point of the interference pattern
obtained on a screen kept 0.6m away from the slit 4
b) Derive the expression for equivalent capacitance of three capacitors in parallel . 4
c) List the differences between Fresnel’s and Fraunhoffer’s diffraction. 2
40. a) Two resistor of 2 Ω & 3Ω are connected in parallel to cell of emf 2V .calculate the main current passing
through the circuit & current through individual resistors 4
b) Give any four applications of lasers 4
c) Define mass defect and binding energy of a nucleus. 2
***********All the best**********
