TNSCERT XII Standard Physics Model Question Paper 2019 : Educational Research and Training Tamilnadu

Organisation : State Council of Educational Research and Training Tamilnadu
Exam : Higher Secondary Second Year
Document Type : XII Standard – Model Question Paper Download
Category or Subject : Physics
Website : http://www.tnscert.org/webapp2/xiimodelquestionspaper.aspx

TNSCERT XII Standard Physics Model Question Paper

** The Government of Tamil Nadu has taken a policy decision on reducing the maximum marks for Higher Secondary Board Examination from 1200 to 600 in order to reduce the examination stress of students besides reducing the number of papers for Language subjects from two to one.

Related : TNSCERT XII Standard Mathematics Model Question Paper 2019 : www.pdfquestion.in/33980.html

Note :
** These are only model questions. Teachers and students need to focus only on the Pattern of the questions.

Physics

Duration: 2.30 Hrs.
Marks : 70

Part – I

I. Choose The Correct Answer : 15×1=15
1. The unit of electric flux.
a) NCm-2
b) N m-2c-1
c) Vm -1
d) Vm

2. Net capacitance of three identical capacitors in series is 1µF. If they are connected in parallel, resultant capacitance will be
a) 3 µF
b)31 µF
c) 9 µF
d) 1 µF

3. The electrical resistivity of copper wire 1m, 2m are ?1Om?2Om at a given temperature, then,
a) ?1 > ?2
b) ?2 < ?1
c) ?1= ?2
d) ?2=2?1

4. The masses of different substances liberated in electrolysis by the same quantity of electricity are proportional to their
a) relative valencies
b) relative atomic masses
c) product of atomic mass and valency
d) ratio of atomic mass and valency.

5. A wire of length l metres carrying a current I ampere is bent in the form of a circle. The magnitude of the magnetic moment is
a) 2plI 2
b) 4p-l2 I
c) 2pl2 I
d) 4plI2

Download Model Question Paper :
Model – 1 :
https://www.pdfquestion.in/uploads/pdf2019/33987-Phy1.pdf
Model – 2 :
https://www.pdfquestion.in/uploads/pdf2019/33987-Phy2.pdf
Model – 3 :
https://www.pdfquestion.in/uploads/pdf2019/33987-Phy3.pdf

6. Which of the following device does not allow DC to pass through?
a) resistor
b) capacitor
c) inductor
d) all

7. At resonance, the value of the power factor in a series LCR circuit is
a) 0
b) 1
c) 2p
d) p

8. In Young’s double slit experiment, 12 fringes are observed in a certain region of the screen when light of wavelength 600 nm is used. If the wave length of light changed as 400 nm, then the number of fringes observed in the same segment of the screen is
a) 12
b) 18
c) 24
d) 30

9. Two photons of energies twice and thrice the work function of a metal are incident on the metal surface. then the ratio of maximum velocities of the photo electrons emitted in the two cases respectively is
a) 2 : 1
b) 1 : 3
c) 3 : 3
d) 1 : 2

10. Anaemia can be diagnosed by
a) 15P31
b) 15P32
c) 26Fe59
d) 11Na24

11. Radio active substances x and y contain equal number of atoms initially. Half life of x and y are 1 day and 2days respectively. At the end of 2nd day and the ratio of rate of disintegration of x and y is.
a) 1 : 2
b) 2 :1
c) 1:1
d) 1:4

12. In p – type semi conductor, there are
a) immobile negative ions
b) immobile positive ions
c) no minority carriers
d) holes as majority carriers

14. All medium wave signals received during the day time use
a) Ground wave
b) Space wave
c) Sky wave
d) all the above

Part – II

Answer any 6 questions in which question no : 22 is compulsory. 6×2=12
16. Define electric field Intensity.
17. If each of the resistances shown in the circuit is R. Calculate the effective resistance between terminals A and B.
18. A current carrying long straight conductor produces magnetic filed of 4 x 10 -8 T at a point 20 cm from the conductor Calculate the current passing through the wire conductor.
19. Write the rms value of alternating current. Draw the graph for the variation of I2 with respect to time
20. Give any two characteristics of electromagnetic waves.
21. Why ordinary plane transmission gratings cannot be used to produce diffraction effects in X – rays?
22. When the energy of the incident radiation increased by 20 %, the kinetic energy of the photo electrons emitted from a metal increased from 0.5 eV to 0.8eV Calculate the work function of the metal.
23. Define the Converse of pair production
24. Why multimeter is called as AVO meter?

Part – III

Answer any six questions in which question No: 33 is compulsory 6×3=18
25. What are the properties of electric lines of forces?
26. Derive an energy associated with an inductor.
27. In Young’s experiment a light of frequency 6×10 14 Hz is used. Distance between the centres of adjacent bright fringes is 0.75 mm. Calculate the distance between the slits, if the screen is 1.5 m away.
28. Write down any three properties of cathode rays.
29. State the laws of photo electric emission.
30. Deduce the relation between a and ß of a transistor
31. Draw circuit diagram of Colpitt oscillatior.
32. What are the merits of Satellite Communication?
33. Calculate the velocity of a photo electron if the work function of a target material is 1.24eV and the wave length of incident light is 4.36 x 10-7 m.

Part – IV

Answer all the questions : 5 x 5=25
34. (a)Derive an expression for the radius of the n th dark ring in Newton’s ring experiment
(b) Wavelength of light in air is 6000A0 What will be its wavelength in a media of refractive in dex 1.5?
(OR)
Derive an expression for a force on a current carrying conductor placed in a magnetic field.

35. (a) A source of alternating emf is connected with RLC series combination circuit. Obtain with the help of vector diagram, the expression for (i) the effective voltage (ii) the phase relationship between the current and the voltage.
(OR)
(b) State Gauss Law Derive an expression for electric field due to an infinite long straight charged wire by using Gauss law.

36. (a) Derive an expression for balaning condition of Wheatstone network.
(b) Calculate the equivalent resistance between points A and B of the circuit shown
(OR)
Explain the working of Ruby laser with energy level diagram.

37. Describe the principle, construction and working of Geiger – Muller counter.
(OR)
Derive an expression for voltage gain of an amplifier with negative feed back.

38. Explain the functional block diagram of a mono chrome TV receiver.
(OR)
(a) Obtain an expression to calculate the amount of radio active substance present at any instant.
(b) The disintegration constant of a radio active element is 0. 00231 per day. calculate its half life and mean life.