Andhra Pradesh Board Class 12 Physics Sample Papers 2009

Class:- 12 th
Subject:- Physics
Time:- 3 Hours
Maximum Marks :-  75
(Sample Question Paper)
Instruction:
(i) Question Nos. 1 to 6 are very short answer type  questions. Each question carries 2 marks. Maximum word linit of answer - 30  words.
(ii) Questions Nos. 7 to 12 are short answer type qu estions. Each question carries 3 marks. Maximum word limit of answer - 50  words.
(iii) Question Nos. 13 to 17 are short answer type q uestion. Each question carries 4 marks. Maximum word limit of answer - 75  words.
(iv) Question Nos. 18 to 22 are long answer type que stions. Each question.Carries 5 marks. Maximum word limit of answer - 150 words.

1.Why polarisation is not possible in sound waves ?

2.If at any point, electric field intensity is zero,  can we accept electric
potential will also the same. If not so why not.66

3.Write the difference between electrochemical equiva lent and chemical equivalent. The north pole of magnet is made to brought near a  metallic ring find the direction of induced current in the ring. Write it’ s concerting law.
“NAND” gate  ls ls ls  “NOT” gate How “NOT” gate is obtained from “NAND” gate. Write  it’s truth table.

4.What is amplitude modulation ?

5.State Joule’s law of heat production.
(OR)
What is Thomson’s effect. Explain positive and nega tive thomson effect.

6.Magnetic moment of magnetic wire is M. It is bended from one end at a distance of one third in L shape find revised magne tic moment.
(OR)
A magnet in earth’s magnetic field oscillates 20 os cillation per minute. If intensity becomes double what is effect on time per iod.

7.Deduce an expression for self inductance of circula r coil. On what factors it will effected.

8.Draw electric circuit diagram for CE NPN Transistor as an amplifier write voltage gain and current gain for it.

9.What is P-N Junction diode ? Draw characteristic cu rve in forward and Reverse Bias.

10.What are microwaves ? How they are being transmitte d. Write its one use.

11.What is Laser Write it’s principle. Explain working of He-Ne Laser.

12.What is photo electric effect ? Write it’s low expl ain why photo electric effect is not seen below threshold energy.

13.Using Kirchhoff’s laws, determine the currents I 1 , I 2 and I 3 for the network shown below:
(OR)
A leclanche cell gets balanced on the wire of poten tiomere at 280cm If a Daniel cell is joined in series with leclanche cell , then the balance point is obtained at 480cm. Compare the emf of two cells.

13.What do you mean by diffraction of light ? Find the position of nth secondary maxima by single slit.
(OR)
What do you mean by Interference of light. Two wave , having approximately equal amplitude a 1 and a 2 and frequencyw. Find the resultant intensity in the case of constructive and destructive interference by superposition of them.

14.Why we combine two or more prism ? Find the conditi on for achromatism.

15.Deduce Lensmaker’s formula for refraction at thin l ens. What are the factors effecting focal length of lens.
(OR)
What do you understand by compound microscope ? By  drawing the ray diagram, obtain its magnifying power when the final image is formed at (1) least distance of distinct vision. (ii) At infi nit

16.Deduce an expression for torque on a bar magnet sus pended in a uniform magnetic field with the help of it write unit and d imensional formula.

17.What is electric flux ? Deduce value of electric fl ux  linked with conductor

18.Deduce an expression for capacity of cylindrical Co ndensor. What are the
factor’s effecting its capacity.

19.Draw labelled diagram of pivoted coil galvanometer. Explain its principle.

20.In alternating current circuit a coil of self induc tance L and condensor of
capacity C connected in series calculate the follow ing:
(1) Resultant potential (2) Impedance
(3) Resonant frequency (4) Average power accumulatio n
(OR)
What is motar starter ? Write its construction, pri nciple and working
with labelled diagram.