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SAINIK SCHOOL, AMARAVATHINAGAR

HOLIDAY HOMEWORK – 2019 – 2020

Class: XII Subject: PHYSICS (042)

S. NO

TOPIC ACTIVITY / PROJECT TIME

PERIOD

MCQ (JEE & NEET

LEVEL)

ANNEXURE NO

1 Electrostatics Question & Answer 2 hrs A

2 Electrostatics MCQ 2 hrs JEE & NEET level

B

3 Investigatory Project Project 5 hrs C

4 Current Electricity Questions & Answer 5 hrs D

5 All chapters Questions 30 hrs E

Annexure:

A. Electrostatics : one / two mark questions - 19 nos

B. Electrostatics : MCQ questions - 80 nos

C. Investigatory Project : Project – any one –to be submitted in A4 sheets with folder

D. Current Electricity : Numerical Questions - 02 nos

E. All chapters : important Questions – must study questions

TEACHER’S NAME SIGNATURE

Recommended By Approved By

Vice Principal Principal

Class: XII

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SAINIK SCHOOL AMARAVATHINAGAR

HOLIDAY HOME WORK - 2019-20

CLASS XII - PHYSICS

GENERAL INSTRUCTIONS:

1. All questions are compulsory.

2. Cadets are required to do this assignment in their class note book.

1. Draw an equipotential surface: (a) In a uniform electric field (b) For a point charge <0.

2. How will the capacitance of a capacitor change when a dielectric slab is introduced between the

plates of a capacitor?

3. How does the resistivity of a conductor depend upon the number density of free electrons and

temperature?

4. Show mathematically that the potential at a point on the equatorial line of an electric dipole is zero.

5. A hollow metal sphere of radius 5cm is charged such that the potential on its surface is 10V. What is

the potential at the center of the sphere?

6. A charge of 12 C is given to hollow metallic sphere of radius 0.1m. Find the potential at (i) the surface

of the sphere (ii) center of the sphere.

7. Calculate the Coulomb force between a proton and an electron separated by 0.8 x 10-15 m.

8. Calculate the Value of electric field exactly balancing the weight of an electron.

9. Two capacitors 3 F & 6 F are connected in series with a 6 V battery. Which one will have higher

potential?

10. If the plates of a charged capacitor are further separated while the capacitor is still connected to

the charging battery, what will happen to the energy?

11. How does a torque affect the dipole in an electric field?

12. 27 drops of same size are charged at 220V each. They collapse to form a bigger drop. Calculate

the potential of the bigger drop.

13. Draw a plot showing the variation of electric field & potential with distance due to a point charge.

14. A wire of resistance 5 ohm is drawn out so that its length is increased to twice its original length.

Calculate its original resistance.

15. A lamp of 100 W works at 220 volt. Calculate its resistance & current capacity?

16. Why are thick copper wires used as connecting wire?

17. Why is the use of a potentiometer preferred over that of a voltmeter for measurement of E.M.F

of a cell?

18. Define resistivity of the material of a wire. State its S.I. unit.

19. The storage battery of a car has an E.M.F. of 12 V. If the internal resistance of the battery is 0.4

ohm, what is the maximum current that can be drawn from the battery?

Annexure: A

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MCQ – JEE / NEET Questions

CHARGES AND ITS CONSERVATION

Annexure: B

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DIELECTRIC CONSTANT AND CHARGE DENSITIES

5

6

7

8

9

10

ELECTRIC FIELD DUE TO DIPOLE

11

12

CONTINUOUS CHARGE DISTRIBUTION

13

14

GAUSS’S LAW AND ELECTRIC FLUX

15

16

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Answers

1 (D), 2 (A), 3 (C), 4 (B), 5 (B), 6 (B), 7 (C), 8 (A), 9 (C), 10 (A), 11 (D), 12 (B), 13 (C), 14 (B), 15 (D), 16

(B), 17 (C), 18 (B), 19 (D), 20 (C), 21 (B), 22 (D), 23 (D), 24 (A), 25 (D), 26 (B), 27 (C), 28 (D), 29 (A),

30 (C), 31 (D), 32 (B), 33 (B), 34 (C), 35 (C), 36 (A), 37 (C), 38 (C), 39 (C), 40 (A), 41 (B), 42 (C), 43

(C), 44 (D), 45 (A), 46 (B), 47 (B), 48 (A), 49 (B), 50 (A), 51 (B), 52 (C), 53 (A), 54 (D), 55 (B), 56 (A),

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57 (B), 58 (A), 59 (D), 60 (A), 61 (D), 62 (A), 63 (C), 64 (A), 65 (A), 66 (D), 67 (C), 68 (A), 69 (B), 70

(C), 71 (B), 72 (C), 73 (B), 74 (A), 75 (D), 76 (A), 77 (C), 78 (D), 79 (B), 80 (B)

Current Electricity

1. Find the equivalent resistance between points A and B in the following cases.

Annexure: D

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2. Find the currents flowing through the various branches in the following circuits using

Kircchoff’s Laws

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SUGGESTED INVESTIGATORY PROJECTS:

1. To study various factors on which the internal resistance/EMF of a cell depends.

2. To study the variations in current flowing in a circuit containing an LDR because of a variationin

(a) the power of the incandescent lamp, used to 'illuminate' the LDR (keeping all the lamps at a fixed

distance).

(b) the distance of a incandescent lamp (of fixed power) used to 'illuminate' the LDR.

3. To find the refractive indices of (a) water (b) oil (transparent) using a plane mirror, an equi convex

lens (made from a glass of known refractive index) and an adjustable object needle.

4. To design an appropriate logic gate combination for a given truth table.

5. To investigate the relation between the ratio of (i) output and input voltage and (ii) number of turns in

the secondary coil and primary coil of a self designed transformer.

6. To investigate the dependence of the angle of deviation on the angle of incidence using a hollow

prism filled one by one, with different transparent fluids.

7. To estimate the charge induced on each one of the two identical styrofoam (or pith) balls suspended

in a vertical plane by making use of Coulomb's law.

8. To set up a common base transistor circuit and to study its input and output characteristic and to

calculate its current gain.

9. To study the factor on which the self inductance of a coil depends by observing the effect of this coil,

when put in series with a resistor/(bulb) in a circuit fed up by an A.C. source of adjustable frequency.

10. To construct a switch using a transistor and to draw the graph between the input and output voltage

and mark the cut-off, saturation and active regions.

11. To study the earth's magnetic field using a tangent galvanometer.

Annexure: C

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IMPORTANT QUESTIONS – MUST STUDY QUESTIONS

I. Book exercise - (a) Electrostatistics and electrostatic potential

(b) Current electricity.

II. Board Questions (5 marks)

1. Gauss Theorem and its applications.

2. Electric field due to a dipole: (a) along the axial line

(b) equatorial line.

3. Energy stored in a capacitor and variation by capacitance by introducing dielectric state.

4. Biot-Savartlaw and its application.

5. Cyclotron.

6. LCR circuit.

7. Bohr’s Theory of Hydrogen atom.

8. Young’s double slit experiment.

9. Transformer.

10. LCR – circuit.

11. Methods of induced e.m.f

12. Transistor as an amplifier and a switch.

13. Len’s Markers formula.

III. Board questions (3 marks)

1. Torque due to dipole.

2. Properties of Electric lines of force.

3. Parallel plate capacitor.

4. Combination of capacitor.

5. Potentiometer and its application.

6. Metre Bridge.

7. Ampere circuital law and its application.

8. Moving Coil Galvanometer.

9. Huygens principle, laws of Reflection/Refraction.

10. Diffraction through single slit.

11. Davison Germer experiment.

Annexure E

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12. Photo Electric Laws.

13. Rutherford alpha scattering experiment.

14. Mass effect and Binding Energy.

15. Self Inductance and Mutual Inductance.

16. Average value of an A.C over a half cycle.

17. R.M.S value of an A.C.

18. Properties of electromagnetic waves.

19. Photo electric laws.

20. A.C. Generator.

21. Nuclear reactor.

22. Various types of diode.

23. Diode used as half wave rectifier and full wave rectifier.

24. PNP or NPN Junction Transistor characteristics.

25. Logic Gates.

26. Mirror equation.

27. Combination of cells.

28. Earth’s component of magnetic field.

29. Microscope/Telescope.

30. Refraction through Prism.

31. Maxwell’s displacement current.

32. Difference between para, dia and ferro magnetic material.

33. Total internal reflection and its application.