Andhra Pradesh Board Class 12 Physics Sample Papers 2007

SAMPLE QUESTION PAPER
PHYSICS
Time : 3 Hours                                                                         Max Marks : 60
Section – A
(Very short Answer type)               10x2=20 Marks
i) Answer all questions.
ii) Each question carries 2 marks.

1. What is Doppler Effect  ? Mention any two of its applications.

2. Why is ‘Red Light’ used in danger signal ?

3. Which phenomenon of light establishes its transverse nature of
vibrations ?

4. Define Magnetic permeability of a magnetic material Mention S.I.
unit of relative Magnetic permeability ?

5. Explain why electric lines of force do not intersect ?

6. Why the internal resistance of a voltmeter is very high ?

7. Give the principle on which a transformer works Mention the use of a
transformer?

8. What do you understand by the Dual nature of matter ?

9. What is ‘mass defect’ ? How is it related to the binding energy of a
nucleus ?

10. What is meant by ‘Forward Biasing’ of a p-n junction diode ? Give
the figure.Section – B
(Short Answer Type)                 6 x 4 = 24 marks
i) Answer any SIX of the following Questions.
ii) Each Question carries 4 marks.

11. a) Explain the phenomenon of ‘Beats’ Two turning forks give 4
beats per second when sounded simultaneously.  The frequency of
one of the tuning forks is 384 Hz.
b) When the other fork is loaded with wax, six beats per second are
produced.  What is the frequency of the second fork ?

12. Draw the diagram of a Ramsden eyepiece and explain its working.

13. How do you account for the appearance of bright and dark bands in
the Yo ung’s Double Slit experiment ?  Give the relevant formulae.

14. How are the magnetic moments of two short bar magnets compared
by equal distance method in Tan A position ? Two bar magnets are
arranged one after the other in Tan A position at equal distances.  If
they produced deflections of 30º and 60º with the needle, find the
ratio of their magnetic moments.

15. Three capacitors of capacitance 2 ìF,  4 ìF and 6 ìF are connected
in parallel and a p.d. of 12 v is applied calculate the charge on each
capacitor.

16. Explain how a moving coil galvanometer can be converted into    
(a)  a Voltmeter and (b) an Ammeter.

17. What is Mosley’s law ? Explain briefly its importance.

18. What is Nuclear Fission ? How is it different from Nuclear Fusion ?Section – C
(Eassy  Type Question)                        2 x 8 = 16 Marks
i) Answer any TWO of the following Questions.
ii) All Questions carry 8 marks each.

19. a) Discuss the origin and properties of different kinds of Spectra ? (6)
b)Explain Fraunhofer Lines on the basis of Buuseu-Kirchoff
Principle     (2)

20. a)Explain, with the help  of a diagram, the principle of
Wheatstone’s Bridge.                                                                     (2)
b) Describe how it is used to determine the specific resistance of the
material of the  given wire.             (4)
c) A known resistance of 15 Ù is connected in the  left gap and an
unknown resistance in the right gap of a Metre  - Bridge. When the
bridge is balanced, balancing length is found to be 60 cm.  Find the
unknown resistance.                                             (2)

21. a) Explain the principle of Transistor    (2)
b) Describe how a transistor can be used as an amplifier (common
emitter mode)         (4)
c) Calculate the current amplification factor (â) when change in
collector current is 0.5 m A for a change in base current of 10 ì   (2)