jac.nic.in Class 12th Sample Questions 2013-2014 : Jharkhand Academic Council

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Type of Announcement : Class 12th Sample Questions 2013-2014

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CLASS 12th SAMPLE QUESTIONS (2014)
PHYSICS :
Unit – I : http://jac.nic.in/pdf/Unit%20-%20I.pdf
UNIT – I ( Electrostatics )
Group-A ( 1 mark each)
1. How many electrons constitute one coulomb of negative charge?
2. What is the cause of charging?
3. Is mass of a body affected of charging?
4. Consider three charged bodies P, Q and R. If P and Q repel each other and P attracts R. What is the nature of force between Q and R?
5. What is the minimum charge ?
6. A glass rod rubbed with silk acquires a charge + 1.6×10-12C. What is the charge on the silk?
7. What is the origin of frictional electricity?
8. What is the value of charge on an electron? (Is a charge less than this value possible?)
9. What is the dimensional formula of o?
10. Four charges of same magnitude and same sign are placed at the corners of a square of each side 0.1 m. What is electric field intensity at the centre of the square?
11. Is electric field intensity a scalar or a vector?
12. What is the unit of electric field intensity?
13. When is the net torque on an electric dipole in an electric is field maximum?
14. What is the net force on a dipole in uniform electric field?
15. When is an electric dipole in stable equilibrium in an electric field?
16. What is the direction of dipole moment?
17. When is an electric line of force straight?
18. Give the S.I unit of electric moment of a dipole?
19. Two point charges of 3 c µ + each are 100cm apart. At what point on the line joining the charges will the electric intensity be zero?
20. What is the amount of work done in moving a 200nc charge between two points 5cm apart on an equipotential surface?
21. Name the physical quantity which has its unit joule/coulomb.
22. Does the electric potential increase or decrease along the electric line of force?
23. What is electric flux? Is electric flux a scalar or a vector?
24. What is the unit of electric flux?
25. What is the dielectric constant of metal?
26. Is there any conductor which can be given almost unlimited charge?
27. Two spheres of silver of same radii, one solid and the other hollow are charged to the same potential, which one has greater charge?
28. What is the net charge on a charged capacitor?
29. What is the dimensional formula of capacitance?
30. How many picofarads are there in a farad?
31. What is the basic use of a capacitor?
32. What is the relation between dielectric constant and electric susceptibility?
33. A parallel plate capacitor has a capacity of 6uF in air and 60uF when dielectric medium is introduced. What is dielectric constant of medium?
34. What is electric charge? Is it scalar or vector?
35.What is the value of 1?
36. What is capacitance? Is it scalar or vector?

Group B (2 mark each)
1 Give any two basic properties of charges?
2 What is super position principle?
3 What is electric field? Give its physical significance?
4 What are the conditions for maximum potential in a Van De Graff generator?
5 What are di-electrics? Give two examples?
6 What are polar and non-polar di-electric?
7 Dielectric constant of medium is unity. What will be its permittivity?
8 Two point charge of +2uc and +6uc repel each other with a force of 12N. If each is given an additional charge of -4uc, what will be the force?
9 Why no two electric lines of force can intersect each other?
10 Define the term electric dipole moment. What is its direction
11 Equi potential surface are perpendicular to field line Wohy?
12 Two protons are 6.0 ×10-15 apart. Find their electrostatic P.E.
13 Is it possible for a metal sphere of 1cm radius to hold a charge of IC?
14 n small drops of same size are charges to v volt each. They coalesce to form a bigger drop. Calculate the capcity and potential of bigger drop.
15 Two capacitors of capacitances 6uF and 12uF are connected in series with a battery. The voltage across the 6uF capacitor is 2V. Compute the total battery voltage.
16 What is quantization of charge ?
17 Find P.E. of an electric dipole & in an electric field ?
18 How much work must be done to charge a 24 F µ capacitor upto a potential diffeence 500 V.
19 Mention the factors on which the capacity of a parallel plate condenser dipends.
20 State the law of conservation of charge.
21 Difine equipotential surface. Draw equiotential surface for an isolated point charge.

Group C (3 marks each)
1. What is neutral point? What will be the position of the neutral point, if the charges are (a) of same kind (b) of opposite kind
2. What is the force of repulsion between two charges of IC each kept 1m apart in vacuum?
3. What is continuous distribution of charge? What do you mean by linear, surface and volume distribution of charge?
4. Two point charges +5×10-19c and +20×10-19c are separated by a distance of 2m. find the point of the line joining them at which electric field intensity is zero.
5. Find electric field on the axis of electric dipole? or equater of dipole.
6. Obtain the expression for the torque acting on an electric dipole placed in a uniform electric field?
7. Show that enrgy stored in a charged capacitor if Q2/2c.
8. Find equivalent capacity for condensers arranged in (a) Series (b) Parallel.
9. Deduce coulamb’s law fram Gauss’s Theorem.

Group D (5 marks each)
1. Derive an expression for the electric potential due to electric dipole –
(a) on axial line (b) on bi-sector line
2. State and prove Gauss’s theorem? Find electric field intensity due to a uniformby charged thin spherical shell (hollow sphore)
3. Derive an expression for the electric potential and field at a point any where due to electric dipole?
4. What is a capacitor? Find capacity of a parallel plate capacitor with compound dielectric?
5. State and prove Gauss’s theorem in electro statics. Use Gauss’s theorem to derive electric field due to infinitely long straight charge wire.
6. What is Van De Graff generater? Give its purpose, use, principle, construction and working?

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