
	Trending ▼ ICSE CBSE 10th ISC CBSE 12th CTET GATE UGC NET Vestibulares ResFinder

12th Physics Practice paper-04

3 pages, 41 questions, 5 questions with responses, 5 total responses,

	Jen -, .	+Fave Message
	Profile Timeline Uploads

Home > the_unknown >

Formatting page ...

PHYSICS Class II PreUni Plus 2016-17 Practice Paper - 04 (Take Home) Max. Marks Duration Date 70 3 Hrs. 15 Min. February, 2017 Instructions 1. Numerical problems solved without writing the relevant formulae carry no marks. 2. Answers without relevant diagram / figure / circuit wherever necessary will not carry any marks. 3. Steps adopted in solving problems should be clearly shown. 4. Draw a line using pen at the end of each answer. Do not overwrite. PART - A I. Answer the following questions (one mark each) [10 1 = 10] 1. What is the shape of trajectory of a charged particle within the dees of a cyclotron? 2. How does the susceptibility of a diamagnetic substance vary when its temperature is increased from 300 K to 330 K? 3. Write the expression for potential energy of a bar magnet in the most stable position in a uniform external magnetic field. 4. State Faraday s law of electromagnetic conduction. 5. What is displacement current? 6. What is the value of measured radiation pressure of visible light? 7. A point source is placed at the principal focus of a biconvex lens. What is the shape of the wavefront in the light emerging out of the lens? 8. What is the shape of equipotential surface due to a point charge? 9. What are isotones? 10. Name the type of radio-waves used for line-of-sight (LOS) communication. PART - B II. Answer any FIVE of the following questions (two marks each) [5 2 = 10] 11. Draw the schematic labeled diagram of van de Graaf generator. 12. Write the values of susceptibility and relative permeability of a material in super-conducting state. 13. Draw the impedance diagram as applied to a series LCR circuit. Write the expression for power factor of the circuit. 14. Current in a coil changes from 5 A to zero in 0.1 s. If the average emf induced in the coil is 100 V, calculate the self inductance of the coil. 15. Explain the terms red shift and blue shift used in astronomy. 2P1617PPP4 1 16. Write the expression for the wavelength of any line in the Balmer series. To which region of the electromagnetic spectrum does the Lyman series belong? 17. Write the circuit symbol and truth table of AND gate. 18. Draw the block diagram of a transmitter in the communication system. PART - C III. Answer any FIVE of the following questions (three marks each) [5 3 = 15] 19. State the principle of superposition as applied to electrostatic forces. Explain with a necessary diagram, how this principle can be applied to find force on a charge in case of system of three point charges. 20. (a) Define gyromagnetic ratio of an electron. (b) Write the expression for Bohr magneton in terms of Planck s constant. (c) What is the value of Bohr magneton in SI system? 21. List any three parameters to show the analogy between electric and magnetic dipoles. 22. Describe the coil and coil experiment of Faraday to produce emf without relative motion between the coils. 23. Mention two conditions and one application of total internal reflection. 24. What is scattering of light? Explain why the sky appears blue for an observer on the Earth. 25. Using Bohr s postulate, derive an expression for velocity of electron in nth stationary orbit of hydrogen atom. 26. Write three differences between n-type and p-type semiconductors. PART - D IV. Answer any TWO of the following questions (five marks each) [2 5 = 10] 27. (a) Define capacitance of a capacitor. (b) Derive expression for energy stored in a capacitor. (c) How is energy density of electric field related to electric field intensity? 28. Define the following terms. Obtain the expression for electric current in a simple circuit consisting of a resistor connected to a cell. 29. Derive an expression for magnetic field due to an infinitely long straight conductor carrying current using Ampere s circuital law. V. Answer any TWO of the following questions (five marks each) [2 5 = 10] 30. What is nuclear force? Write its four characteristics. 31. What is rectification? Describe the working of semiconductor diode as a half wave rectifier with a neat diagram. Draw the input and output waveforms. 32. Describe Young s double slit experiment to demonstrate interference of light. 2P1617PPP4 2 VI. Answer any THREE of the following questions (five marks each) [3 5 = 15] 33. Calculate the resonant frequency of a series LCR circuit with an inductance 4 H, capacitance of 64 F and resistance of 20 ohm. What is the Q-value of the circuit? 34. Two point charges 4 10 6 C and 2 10 6 C are placed at the vertices A and B of a right angled triangle ABC respectively. B is the right angle. AB 3 10 2 m, AC = 2 10 2 m and BC = 1 10 2 m. Calculate the magnitude of resultant electric field intensity at point C. 35. A galvanometer of resistance 50 requires a current of 2 mA for full scale deflection. Calculate the full scale deflection voltage across the galvanometer.How do you convert it into (a) an ammeter of range (0 3 A) and (b) a voltmeter of range (0 5 V)? 36. A prism is made of glass of unknown refractive index. A parallel beam of light is incident on the refracting face of the prism. By rotating the prism, the minimum angle of deviation is measured to be 40 . What is the refractive index of the material of prism? The refracting angle of the prism is 60 . If the prism is immersed in water of refractive index 1.33, predict the new minimum angle of deviation of a parallel beam of light 37. The kinetic energy of photoelectrons increases by 0.621 eV, when the wavelength of light incident on a metal surface is decreased from 500 nm to 400 nm. Calculate the Planck s constant. Take c = 3 108 ms 1. *** 2P1617PPP4 3

Formatting page ...

Top Contributors
to this ResPaper
(answers/comments)

American Badass
(5)

the_unknown chat

Horizontal lines at:
Guest Horizontal lines at:
AutoRM Data:
Box geometries: