# 1. Electric Charges and Fields 2ndPUC PYQs 3bf49c2e-08df-4ae2-b6e8-84077cc8d556-combined ```Electric Charges and Fields
(1+2+3=8)
For: PU Board
1 Marks
1. Write the SI unit of charge.
(2014,2015)
2. State Coulombs law.
(2015, 2017, 2019)
3. A Charged particle enters an electric field in the direction of electric field. What is the
nature of the path traced by it?
(2015)
4. Write the SI unit of Electric field.
(2016)
5. How does the electrostatic force between two-point charges change, when a dielectric
medium is introduced between them?
(2017s)
6. Write the SI unit of electric flux.
(2020)
2 Marks
1. State and explain Coulombs law in electrostatics.
2. Write Coulombs law in vector form. Explain the terms.
3. Write any two properties of electric field lines.
4. State and explain Gauss’s law in electrostatics.
5. Sketch the electric lines of force due to a point charge q. if
i)
q&lt;0 ii) q&gt;0
6. Write any two basic properties of charge
7. What is electric dipole? Write is SI unit.
3 Marks
8. Mention any three properties of electric charges.
9. Write any three properties of electric field lines.
(2014,2020,2021m)
(2015)
(2015, 2017)
(2017s)
(2016)
(2019)
(2021m)
(2014 ,2021m)
(2018s,2019s 2021m)
5 Marks
1. State Gauss law in electrostatics.
Using the law derive an expression for electric field due to uniformly charged thin
spherical shell at a point outside the shell.
(2014,2018s)
2. Derive an expression for electric field due electric dipole at a point on an equatorial
line.
(2015,2019s,2021m)
3. State Gauss law in electrostatics. Derive the expression for electric field at a point due
to an infinitely long charged straight conductor using Gauss’s law.(2015,2016s,2021m)
4. Derive an expression for electric field due to an electric dipole at a point on the axial
line.
(2016,2017s)
5. Two-point charges qa = 3𝜇 c and qb=-3𝜇c are located 20cm apart in vacuum.
a) What is the electric field at the midpoint O of the line AB joining the two charges?
b) If a negative test charge of magnitude 1.5&times;10-9 C is placed at this point. What is the
force experienced by the test charge?
(2017)
6. State Gauss’s law. Derive an expression for electric intensity at a point outside the
uniformly charged shell.
7. Three charges each equal to +4nC are placed at the three corners of a square of side
2cm. Find the electric filed at the fourth corner.
(2018)
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Electric Charges and Fields
(1+2+3=8)
For: PU Board
10. Two-point charges qA = 5𝜇C and qB = -5𝜇C are located at A and B separated by 0.2
m in vacuum.
(2020)
a) What is the electric field at the midpoint O of the line joining the charges?
b) If a negative test charge of magnitude 2 nC is placed at O, what is the force
experienced by the test charge?
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Board.
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Electrostatic Potential and Capacitance
(3+5=8)
For: PU Board
1 Marks
1. What is a capacitor?
(2014)
2. What is an electric dipole?
(2016)
3. How does the electrostatic force between two-point charges change, when a dielectric
medium is introduced between them?
(2017s)
4. What is electrostatic shielding?
(2021m)
5. What is an equipotential surface?
(2021m)
2 Marks
1. Establish the relation between electric field and electric potential.
(2014,2017s)
2. Derive the expression for capacitance of parallel plate capacitor.
(2015)
3. On what factors does the capacitance of a parallel plate capacitors depends?
(2017,2021m)
4. Obtain the expression for effective capacitance of two capacitors connected in series.
(2018s,2019s)
5. A parallel plate capacitor with air between the plates has a capacitance C. what will be the
capacitance if
(2020)
a) The distance between the plates is doubled?
b) The space between the plates is filled with a substance of dielectric constant 5?
6. Write the relation between electric field and potential. A point charge +Q is placed at point O
as shown in the figure. Is the potential difference VA – VB positive, negative or zero? (2021m)
3 Marks
1. Derive the expression for potential energy of a system of charges in the absence of the external
electric field.
(2014,2016s,2021m)
2. Derive the expression for capacitance of parallel plate capacitor.
(2015)
3. Derive the relation between electric field and electric potential due to a point charge.
(2015,2017,2020)
4. Derive an expression for energy stored in a charged capacitor.
(2016,2020,2021m)
5. Derive an expression for potential energy of electric-di-pole placed in an uniform electric field.
(2019)
5 Marks
1. In a parallel plate capacitor with air between the plates, each plate has an area of 6&times;10-3 m2 and
the distance between the plates is 3 mm. calculate the capacitance of capacitor.
If this capacitor is connected to a 100V supply. What is the charge on each plate of the
capacitor? [Absolute permittivity of free space = 8.85&times;10-12Fm-1]
(2014)
-8
-8
2. Two charges 3&times;10 c and -2&times;10 c are located 15 cm apart. At what point on the line joining
the two charges is the electric potential zero? Take the potential at infinity to be zero.
(2014s)
3. Two-point charges +1nC and -4nC are 1m apart in air. Find the positions along the line joining
the two charges at which resultant potential is zero.
(2015)
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Electrostatic Potential and Capacitance
(3+5=8)
For: PU Board
4. ABCD is a square of side 2m. Charge of 5nC, +10nC and -5nC are placed at corner A, B and
C respectively. What is the work done in transferring a charge of 5𝜇C from D to the point of
intersection of the diagonals
(2015s)
5. When two capacitors are connected in series and connected across 4kV line, the energy stored
in the system is 8J. The same capacitor, if connected in parallel across the same line, the energy
stored is 36J. Find the individual Capacitances.
(2016)
6. Charges 2𝜇C, 4𝜇C and 6𝜇C are placed at the three corners A, B and C respectively of a square
ABCD of side x meter. Find, what charge must be placed at the fourth corner so that the total
potential at the center of the square is zero.
(2016s)
-3
7. In a parallel plate capacitor with air between the plates, each plate has an area 8 &times; 10 m2
and distance between the plates is 2 mm. Calculate the capacitance of the capacitor. If this
capacitor is connected to a 50 V supply, what is the charge on each plate of the capacitor?
(Absolute permittivity of free space = 8.85 &times; 10-12 Fm-1)
(2017s)
2
8. The plates of a parallel plate capacitor have an area of 100 cm each and are separated by 3
mm. The capacitor is charged by connecting it to a 400 V simply.
(2018s)
a) Calculate the electrostatic energy stored in the capacitor.
b) If a dielectric of dielectric constant 2.5 is introduced between the plates of the capacitor,
then find the electrostatic energy stored and also change in the energy stored.
9. In a circular parallel plate capacitor radius of each plate is 5 cm and they are separated by a
distance of 2mm. calculate the capacitance and the energy stored, when it is charged by
connecting the battery of 200 V (given ∈0 = 8.854 &times; 10-12Fm-1).
(2019)
10. ABCD is a square of side 1m. Charges of +3Nc, -5nC and +3 nC are placed at the comers A,
B and C respectively. Calculate the work done in transferring a charge of 12𝜇C from D to the
point of intersection of the diagonals?
(2019s)
11. Two charges 5&times;10-8c and -3&times;10-8c are located 16 cm apart. At what point on the line joining
the two charges is the electric potential zero? Take the potential at infinity to be zero. (2021m)
12. A 4 μF capacitor is charged by a 200 V supply. It is then disconnected from the supply, and
is connected to another uncharged 2 μF capacitor. How much electrostatic energy of the first
capacitor is lost in the form of heat and electromagnetic radiation?
(2021m)
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Current Electricity
(1+2+2+3+5=13)
For: PU Board
1 Marks
1. Define mobility of electron.
(2014,2017)
2. Define drift velocity of electrons.
(2014)
3. A resistor is marked with colours red, red, orange and gold. Write the value of its resistance.
(2015)
4. What is the condition for the balanced state of Wheatstone’s network?
(2015)
5. State Kirchhoff’s junction rule.
(2017s)
6. State Ohm’s law.
(2018s)
7. Define electrical resistivity of material of a conductor.
(2019)
8. How does the Resistance of a Conductor Vary with its length?
(2019s)
9. A wire of resistivity is stretched to three times its length. What will be its new resistivity?
(2021m)
10. Mention one application of potentiometer.
(2021m)
2 Marks
1. Draw Wheatstone’s bridge circuit and write the condition for its balance.
(2014)
2. Give any two limitations of ohms law.
(2014,2015,2019s)
3. State and explain Ohm’s law.
(2017)
4. Define mobility. Mention its S.I. Unit
(2017s)
5. What is ohmic device? Give one example
(2017s)
6. Represent graphically the variation of resistivity with absolute temperature for copper and
nichrome metals.
(2018s)
7. Write the expression for drift velocity in terms of current, explain the terms used.
(2019)
8. Define the terms: (a) drift speed and (b) mobility of an electron in a conductor.
(2021m)
9. Draw a neat diagram of a Wheatstone’s network. Mention the condition for its balance.
(2021m)
3 Marks
1. Derive an expression for drift velocity of free electrons in a conductor
(2016s,2021m)
⃗⃗
2. Derive the relation 𝑗⃗ = 𝜎𝐸 with terms have usual meaning.
(2017s)
3. Write any three limitations of Ohm’s law.
(2021m)
4. State Kirchhoff’s laws. Name the Kirchhoff’s law which is a consequence of principle of
conservation of energy.
(2021m)
5. Draw graphs showing variation of resistivity with temperature for (a) copper, (b) nichrome
and (c) a semiconductor.
(2021m)
5 Marks
1. With the help of a circuit diagram, obtain the expression for equivalent resistance of two
resistors connected in parallel.
(2014)
2. Derive the condition for balanced of wheat stone’s bridge using Kirchhoff’s laws.
(2014,2016, 2017,2019s)
3. What is equivalent resistance? Derive the expression for effective resistance of two resistors
connected in parallel.
(2015)
4. Assuming the drift velocity, derive the expression for conductivity of a material σ =
symbols have usual meaning. Define the term mobility.
𝑛𝑒 2 𝜏
𝑚
where
(2015s)
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Current Electricity
(1+2+2+3+5=13)
For: PU Board
5. A battery of internal resistance 3Ω is connected to 20Ω resistor and potential difference across
the resistor is 10V. If another resistor of 30 Ω is connected in series with the first resistor and
battery is again connected to the combination, calculate the emf. And terminal potential
difference across the combination.
(2014)
6. A network of resistors is connected to a 12V battery as shown in the figure.
a) Calculate the equivalent resistance of the network.
b) Obtain current in 12Ω and 6Ω resistors.
(2014)
7. Two cells of emf 2v and 4v and internal resistance 1Ω and 2Ω respectively are connected in
parallel so as to send the current in the same direction through an external resistance of 10Ω.
Find the potential difference across 10Ω resistor.
(2015)
8. Two identical cells either in series or in parallel combination, gives the same current of 0.5 A
through external resistance of 4Ω. Find the emf and internal resistance of each cell. (2015)
9. A) Three resistors of resistance 2Ω, 3Ω and 4Ω are combined in series what is the total
resistance of the combination.
c) If this combination is connected to a battery of emf 10V and negligible internal resistance
obtain the potential drop across each resistor.
(2016)
-8
10. A wire having length 2.0m, diameter 1.0 mm and resistivity 1.963&times;10 Ω m is connected in
series with a battery of emf 3V and internal resistance 1 calculate the resistance of the wire and
current in the circuit.
(2016s)
11.When two resistors are connected in series with a cell of emf 2 V and negligible internal
resistance, a current of
main current is
5
3
2
5
A flows in the circuit. When the resistors are connected in parallel the
A. calculate the resistance.
(2017)
12. a) Three resistors 4 Ω, 6 Ω and 8 Ω are combined in parallel.
(2017s)
What is the total resistance of the combination?
b) If the combination is connected to a battery of emf 25 V and negligible internal resistance.
Determine the current through each resistor and total current drawn from the battery.
13. In the given circuit diagram, calculate: (i) The main current through the circuit and (ii) Also
curren through 9 Ω resistor.
(2018s)
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Current Electricity
(1+2+2+3+5=13)
For: PU Board
14.Two cells of emf E1 and E2 and internal resistance r1 and r2 are connected in parallel such that
they send current in same direction. Derive an expression for equivalent resistance and
equivalent emf of the combination.
(2019)
15.Two resistors are connected in series with 5V battery of negligible internal resistance. A current
of 2A flows through each resistor. If they are connected in parallel with the same battery of
current of 25/3 A flows through combination. Calculate the value of each resistance. (2019)
16. A network of Resistors is Connected to a 16V battery with internal resistance 1 Ω as shown in
Figure below.
(2019s)
a) Compute the equivalent resistance of the network
b) Calculate the total current in the circuit.
17. Six lead-acid type of secondary cells each of emf 2.0 V and internal resistance 0.015 Ω are
joined in series to provide a supply to a resistance of 8.5 Ω. What are the current drawn from
the supply and its terminal voltage?
(2021m)
2
-6
18. A wire of length 2 m, area of cross-section 0.5 mm and resistivity 1.5 &times; 10 Ωm is connected
in series with a cell of emf 4 V. If the current through the wire is 0.5 A, calculate: (a) the
internal resistance of the cell and (b) the rate of energy dissipated by the wire.
(2021m)
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2.
3.
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In app chat feature for all your doubts directly with the faculty (RP Sir)
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Moving charges and Magnetism
(2+3+5=10)
For: PU Board
1 Marks
1. State Ampere’s circuital law.
(2015,2019s)
2. What is Cyclotron?
(2016)
3. When will the magnetic force on a moving charge be maximum in a magnetic field? (2016)
4. What is Lorentz force?
(2017s)
5. Write the expression for force acting on a moving charge in a magnetic field
(2019)
6. Write the expression for force experienced by a straight conductor of length L carrying a
steady current I, moving in a uniform external magnetic field B.
(2018s)
7. Mention the SI unit of magnetic moment.
(2021m)
8. Write the value of Bohr magneton.
(2021m)
2 Marks
1. Write any two uses of cyclotron.
(2014)
2. State Amperes circuital law and represent it mathematically.
(2014)
3. What is a toroid? Mention an expression for magnetic field at a point inside a toroid? (2016)
4. A galvanometer having a coil of resistance 12Ω gives full scale deflection for a current of 4
mA. How can it be converted into a voltmeter of range 0 to 24V?
(2016)
5. Write the expression for cyclotron frequency and explain the terms.
(2018s)
6. Mention an expression for the magnetic field produced at the centre on the axis of a current
carrying Solenoid and Explain the terms.
(2019s)
7. Explain how galvanometer can be converted to an ammeter.
(2017s,2019s,2021m)
3
-1
⃗ = 0.1 𝑘̂T are
8. In a region, an electric field 𝐸⃗ = 5 &times;10 𝑗̂ NC and a magnetic field of 𝐵
applied. A beam of changed particles are projected along X-direction.
Find the velocity of charged particles which move undeflected in this crossed fields (2020)
9. Write the expression for magnetic field inside a solenoid and explain the terms. (2021m)
10. A proton and an electron enter a uniform magnetic field at the same angle with the field and
with the same speed. Do they experience force of same magnitude?
(2021m)
11. Calculate the magnitude of magnetic field at a distance of 2 m from a very long straight wire
carrying a current of 5 A?
(2021m)
3 Marks
1. Write the uses of cyclotron.
(2014)
2. Explain with circuit diagram how to convert galvanometer into an ammeter.
(2015,2017)
3. State Ampere’s circuital law. Using it, derive the expression for magnetic field at a points due
to a long current carrying conductor.
(2015)
4. How do you convert a galvanometer into a voltmeter? Explain with a circuit diagram.
(2017s,2021m)
5. Give the principle of cyclotron and draw the neat labelled schematic diagram of cyclotron
(2020)
6. Write the expression for force per unit length between two straight parallel current carrying
conductors of infinite length. Hence define SI unit of current ‘ampere’.
(2019)
7. Obtain the expression for radius of circular path of charged particle in a magnetic field.
(2021m)
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Moving charges and Magnetism
(2+3+5=10)
For: PU Board
5 Marks
1. Derive an expression for magnetic field strength at any point on the axis of a circular loop using
Biot-Savart’s law.
(2014,2015,2017,2019,2021m)
2. Derive the expression for the force between two parallel conductors carrying current and hence
define ‘ampere’.
(2015s, 2016,2016s,2017s,2018s,2020)
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2.
3.
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Lecture pdfs and Hand written notes for important formulas and derivations for PU Board.
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www.simplifiedminds.com
Call Us: 7411-008-008
Whatsapp Us: 8867-008-008
Magnetism and Matter
(1+2=3)
For: PU Board
(1 marks)
1. Draw the pattern of magnetic field lines for a bar magnet.
2. What is magnetic declination?
3. State Curie’s Law.
4. Define magnetization of a sample.
5. Where on the Earth’s surface is the magnetic dip zero?
6. What is magnetic susceptibility?
7. What is Retentivity?
8. What is the value of dip at a point on the magnetic equator?
9. State Gauss’s law in magnetism.
(2014)
(2015,2019s)
(2015s,2016s)
(2016)
(2016s,2018s)
(2019)
(2019s)
(2021m)
(2021m)
(2 marks)
1. What is magnetic susceptibility? For which material is it low and positive?
(2014)
2. Write two properties of magnetic lines of force
(2014s,2015)
3. Distinguish between diamagnetism and ferromagnetism on the basis of relative permeability
and susceptibility.
(2015s)
4. Draw the variation of magnetic field (B) with magnetic intensity (H) when a ferromagnetic
material is subjected to a cycle of magnetization.
(2016)
5. Distinguish between paramagnetic and ferromagnetic substances.
(2016s)
6. Define the terms:
i)
Declination
ii)
Inclination or dip
(2017)
7. Write any two differences between diamagnetic and paramagnetic substances.
(2017s)
8. State and explain ‘Curie’s Law’ in magnetism.
(2018s)
9. Define magnetic ‘dip’ and ‘declination’ at a place
(2019,2021m)
10. Define “retentivity” and “coercivity”.
(2020)
11. Write any two properties of magnetic field lines.
(2021m)
(3 marks)
1. What are (a) magnetic declination (b) magnetic dip (c) horizontal component of earth’s
magnetic field a place?
(2014)
2. Write the three difference between diamagnetic and paramagnetic substances (2015,2018s)
3. Define: (a) Magnetic declination (b) Magnetic dip (c) Mention the SI unit of magnetization.
(2015s)
4. Write three properties of ferromagnetic materials.
(2016)
5. State and explain Gauss law in magnetism.
(2016s)
6. Distinguish between ‘dia’ and ‘ferro’ magnetic materials
(2019,2019s)
7. Write three properties of diamagnetic materials.
(2020)
(5 marks)
1. Write any four properties of ferromagnetic materials and give an example for it. (2014s)
2. Write any five properties of ferromagnetic materials.
(2017)
3. Show that a current carrying solenoid is equivalent to a bar magnet.
(2017s)
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Magnetism and Matter
(1+2=3)
For: PU Board
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Electromagnetic Induction
(1+2+5=8)
For: PU Board
(1 marks)
1. State Faradays law of electromagnetic induction
(2014s,2016)
2. Mention the significance of Lenz’s law.
(2015,2016s,2017)
3. What is self-induction?
(2015s)
4. Give the expression for energy stored in an inductance coil carrying current.
(2014)
5. What is motional electromotive force?
(2017s)
6. State ‘Lenz’s law in electromagnetic induction.
(2018s)
7. How the self-inductance of a coil depends on number of turns in the coil?
(2019)
8. Write any one advantage of Eddy Current.
(2019s)
9. Name the law used to find the polarity of induced emf in a coil.
(2021m)
10. How does self-inductance of an ideal coil vary with the current passing through it? (2021m)
(2marks)
1. Mention any two advantages of eddy currents in practical applications.
(2014,2021m)
2. What are eddy currents? Give one use of it.
(2014s, 2015s)
3. Current in a coil falls from 2.5 A to 0.0 A in 0.1 second inducing an emf of 200V. Calculate
the value of self-inductance
(2015)
4. The current in a coil of self inductance 5mH changes from 2.5A to 2.0 A in 0.01 second.
Calculate the value of self induced emf
(2016)
5. What is meant by self inductance and Mutual Inductance?
(2016s)
6. State and explain Faraday’s law of electromagnetic induction.
(2017)
2
7. The magnetic flux linked with a coil varies as 𝜙 = 3t + 4t + 9 Find the magnitude of the emf
induced at t = 2s.
(2017s)
8. Mention any two factors on which the self inductance of a coil depends.
(2018s)
9. A pair of adjacent coils has a mutual inductance of 1.5 H. If the current in one coil changes
from 0 to 20 A in 0.5 s, what is the change of flux linkage with the other coil?
(2021m)
(3 marks)
1. State and explain Lenz law for induced e.m.f
(2014)
2. Mention any three applications of eddy currents.
(2017s)
3. Derive an expression for e.m.force (motional emf) induced in a rod moving perpendicular to
the uniform M.F.
(2014s,2015,2016s,2017)
4. Explain briefly the coil and magnet experiment to demonstrate electromagnetic induction.
(2016,2018s)
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Electromagnetic Induction
(1+2+5=8)
For: PU Board
(5 marks)
5. What is AC generator? Derive an expression for instantaneous emf in AC generator.
(2019s, 2021m)
6. State and explain Faraday’s law of electromagnetic induction. Derive an expression for the
motional emf induced in a rod which is moving in a plane perpendicular to a uniform
magnetic field.
(2021m)
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2.
3.
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Call Us: 7411-008-008
Whatsapp Us: 8867-008-008
Alternating Currents
(3+5=8)
For: PU Board
(1 marks)
1. How is rms voltage of AC related to peak value of ac voltage?
2. Mention the value of power factor of a pure capacitor
3. What is ‘wattless’ current?
4. How does capacitive reactance vary with frequency? (2020)
(2 marks)
1. Mention two sources of energy loss in transformer.
(2014,2017s)
(2017s)
(2018s)
(2020)
(3 marks)
1. Explain the construction of transformer. Mention its principle.
(2014)
2. Derive an expression for resonant frequency of service circuit containing inductor, capacitor
and resistor.
(2014s)
𝜋
3. Show that voltage leads current by 2 , when A.C voltage applied to pure inductance. (2015)
4. Derive the expression for energy stored in a current carrying coil.
(2015s)
5. What is the principle behind the working of a transformer? Mention any two sources of
energy loss in transformers.
(2015s)
6. What is a transformer? Mention two sources of energy loss in a transformer.
(2016,2017,2019s)
7. With a diagram, explain the working of a transformer.
(2016s)
8. Mention the three types energy loss in a transformer
(2019,2021m)
9. Show that the current and the voltage are in phase for the passage of AC through a resistor.
(2021m)
(5 marks)
1. Calculate the resonant frequency and Q-factor of a series LCR circuit containing a pure
inductor of inductance 3H, Capacitor of capacitance 27𝜇f and resistor of resistance 7.4 Ω
given
(2014)
2. A pure inductor of 25mH is connected to a source of 220 V and 50 Hz. Find the inductive
reactance, rms value of current and peak current in the circuit.
(2014s)
3. A sinusoidal voltage of peak value 283 V and frequency 50 Hz is applied to a series LCR circuit
in which R = 3 Ω, L = 25.48 mH and C = 796 𝜇𝐹. Find
(2015,2019s,2021m)
a) Impedance of the circuit.
b) The phase
c) The power dissipated in the circuit.
4. A resistance of 100Ω, a pure inductance coil of L = 0.5 H and capacitor are in series in a
circuit containing an a.c. source of 200V, 50 Hz. In the circuit, current is a head of the
voltage by 300. Find the value of the capacitance
(2015s)
5. Calculate the resonant frequency and Q-factor of a series LCR circuit containing a pure
inductor of inductance 4H, Capacitor of capacitance 27𝜇f and resistor of resistance 8.4 Ω
given
(2016)
6. An inductor and a bulb are connected in series to an AC source of 220 V, 50 Hz. A rcurrent
𝜋
of 11A flows in the circuit and phase angle between voltage and current is 4 radians.
Calculate the impedance and inductance of the circuit.
(2016s)
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Alternating Currents
(3+5=8)
For: PU Board
7. A source of alternating current of 220V – 50 Hz is connected in series with a resistance of
200 Ω, an inductance of 100 mH and a capacitance of 30 𝜇F. Does the current lead or lag the
voltage and by what angle?
8. A sinusoidal voltage of peak value 285 V is applied to series LCR circuit in which resistor of
resistance 5 Ω, pure Inductor of Inductance 28.5 mH and capacitor of capacitance 800 𝜇F are
connected.
(2017s)
a) Find the resonant frequency.
b) Calculate the impedance, current and power dissipated at the resonance.
9. A 20 Ω resistor, 1.5 H inductor and 35 𝜇F capacitor are connected in series with a 220 V, 50
Hz ac supply. Calculate the impedance of the circuit and also find the current through the
circuit.
(2018s)
10. Derive an expression for the impedance of a series LCR circuit, when an AC voltage is
applied to it.
(2019)
11. A series LCR circuit contains a pure inductor of inductance 5.0 H, a capacitor of capacitance
20𝜇F and a resistor of resistance 40 Ω.
(2020)
a) Find the resonant frequency of the circuit.
b) Calculate the Quality factor (Q-factor) of the circuit.
c) What is the impedance at resonant condition?
12. Calculate the resonant frequency of a series LCR circuit with L = 2.0 H, C = 32 μF and R =
10 Ω. What is the Q-value of this circuit?
(2021m)
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Ray Optics and Optical Instruments
(1+5=6)
For: PU Board
1 Marks.
1. Which type of lens is used to correct myopia (short sightedness)?
(2014s, 2015s)
2. How does the power of lens vary with its focal length?
(2015, 2016)
3. How the power of lens is related to its focal length?
(2017)
4. Two lenses of power +1.50D and -0.5D are kept in contact on their principal axis. What is the
effective power of the combination?
(2018)
5. For which position of the object magnification of convex lens is -1. (minus one)?
(2019)
6. Why does sky appear blue?
(2020)
7. A concave lens of refractive index 1.5 is immersed in a medium of refractive index 1.65.
What is the nature of the lens?
(2021m)
8. Define critical angle for total internal reflection.
(2021m)
2 Marks.
1. Draw the ray diagram of image formation in case of compound microscope.
(2015)
2. Write the two conditions for total internal reflection to take place.
(2015s)
3. What is myopia? How to correct it?
(2016,2018)
4. Name the type of lens which is used to correct
i)
Myopia
ii)
Hypermetropia.
(2017)
5. Write the ray diagram for formation of image in the microscope
(2019)
3 Marks.
1. Mention three applications of total internal reflection of light.
(2014)
2. Write the expression for limit of resolution of a) microscope and b) telescope. Write one
method of increasing the resolving power of microscope.
(2014s)
3. What is total internal reflection? Mention two applications of optical fibers.
(2016s)
4. Define critical angle. Write two conditions for total internal reflection.
(2017s)
5. Derive the expression for effective focal length of two thin lenses kept in contact. (2018s)
6. Derive the relation between focal length and radius of curvature of a concave mirror. (2019s)
7. Arrive at the relation between focal length and radius of curvature of a spherical concave
mirror
(2020)
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Ray Optics and Optical Instruments
(1+5=6)
For: PU Board
5 Marks
1. Two lenses of focal lengths 0.20 m and 0.30 m are kept in contact. Find the focal length of
the combination. Calculate powers of two lenses and combination.
(2014)
o
o
2. A prism of angle 60 produces angle of minimum deviation of 40 . What is its refractive
index? Calculate the angle of incidence.
(2014s)
3. Derive the expression for refractive index of the material of the prism in terms of angle of the
prism and angle of minimum deviation.
(2015,2021m)
4. Derive Lens maker’s formula
(2015s, 2016s,2017,2017s,2019,2021m)
5. Derive an expression for equivalent focal length of two thin lenses kept in contact.
(2016)
6. Deduce the relation between n, u, v, R for refraction at a spherical surface, where the symbols
have their usual meaning.
(2018)
7. The radii of curvature of two surfaces of a convex lens is 0.2 m and 0.22 m. find the focal
length of the lens if refractive index of the material of lens is 1.5. Also find the change in focal
length, if it is immersed in water of refractive index 1.33.
(2018s)
8. An object of 3 cm is placed 14 cm in front of a concave lens of focal length 21 cm. Find the
position, nature and size of the image formed.
(2019s)
9. At what angle should a ray of light be incident on the face of an equilateral prism, so that it
just suffers total internal reflection at the other face? The refractive index of the material of
the prism is 1.5
(2020)
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Wave Optics
(2+5=7)
For: PU Board
1 Marks.
1. What is wave front of light waves?
2. How can the resolving power of a telescope be increased?
3. Write the formula for Malus law.
4. For which angle of incidence reflected ray is completely polarized?
5. Mention a method to increase the resolving power of a microscope.
(2014)
(2016)
(2016s)
(2019)
(2020)
2 Marks.
1. Explain ‘Malus law’ for polaroids.
(2014)
2. State laws of refraction.
(2014s)
3. Mention two applications of infrared radiation.
(2015)
4. Mention two applications of polaroids.
(2016)
5. Write the relation between the path difference and wavelength of light wave used for
constructive and destructive interference of light.
(2016s)
6. What is diffraction of light?
(2019)
7. What is a wave front? Name the type of wave front for a distant point source.
(2021m)
8. What is the shape of the emergent wavefront when a plane wavefront is incident on:
(a) a prism and (b) a convex lens?
(2021m)
3 Marks.
1. It is the phenomenon of redistribution of light energy due to superposition of two or more light
waves. Condition for constructive and destructive.
(2015)
2. Explain Young’s double slit – experiment.
(2015s)
3. Mention any three applications of polarides
(2017)
4. Write any three differences between Interference and diffraction.
(2017s)
5. What is polarisation ? Name any one method of producing plane polarised light.
(2018s)
6. Arrive at Snell’s law of refraction, using Huygens principle for refraction of a plane wave.
(2018)
7. Using Huygen’s principle, show that the angle of incidence is equal to the angle of reflection
when a plane wave front is reflected by a plane surface
(2019s,2020)
5 Marks
1. Obtain the expression for fringe width in the case of interference of light waves (YDSE
Experiment)
(2014,2014s,2016,2018s,2019s,2020)
2. In a Young’s double slit experiment distance between the slits is 1mm. the fringe width is found
to be 0.6 mm. when the screen is moved through a distance of 0.25 m away from the plane of
the slit, the fringe width becomes 0.75mm. Find the wavelength of light used.
(2015)
3. A rigid beam of light consisting of two wavelength 4200 A0 and 5600A0 is used to obtain
interference fringes in Young’s double slit experiment. The distance between the slits is 0.3mm
and the distance the slits and the screen is 1.5m. Compute the least distance of the point from
the central maximum, where the bright fringes due to both the wavelengths coincide.
(2015s)
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Wave Optics
(2+5=7)
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4. In Young’s double slit experiment while using a source of light of wavelength 4500 A0,the
fringe width is 5mm. if the distance between the screen and the plane of the slits is reduced to
half, what should be the wavelength of light to get fringe width 4mm?
(2016s)
5. Light of wave length 6000 A0 is used to obtain interference fringes of width 6mm in a Young’s
double slit experiment. Calculate the wave length of light required to obtain fringe of width 4
mm when the distance between the screen and slits is reduced to half of its initial value
(2017)
6. In Young’s double slit experiment distance between the slits is 0.5 mm. When the screen is
kept at a distance of 100 cm from the slits, the distance of ninth Bright fringe from the center
of the fringe system is 8.835 mm. Find the wavelength of light used.
(2017s)
7. In Young’s double slit experiment the slits are separated by 0.28 mm and the screen is placed
at a distance of 1.4 m away from the slits. The distance between the central bright fringe and
the fifth dark fringe is measured to be 1.35 cm. calculate the wavelength of the light used. Also
find the fringe width if the screen is moved 0.4 m towards the slits, for the same experimental
set up.
(2018)
8. In a Young’s double slit experiment wave length of light used is 5000 &Aring; and distance between
the slits is 2 mm, distance of screen from the slits is 1m. find fringe width and also calculate
the distance of 7th dark fringe from central bright fringe
(2019)
9. Obtain the expression for the fringe width of interference fringes in Young’s Double slit
experiment.
(2020)
10. In a Young’s double-slit experiment, the slits are separated by 0.28 mm and the screen is
placed 1.4 m away. The distance between the central bright fringe and the fourth bright fringe
is measured to be 1.2 cm. Determine the fringe width and the wavelength of light used in the
experiment.
(2021m)
11. In a Young’s double slit experiment setup with monochromatic light, fringes are obtained on
a screen placed at a certain distance from the slits. If the screen is moved by 5 cm towards the
slits, the change in fringe width is 20 μm. Given the distance between two slits to be 1.2 mm,
calculate the wavelength of the light used.
(2021m)
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(1+5=6)
For: PU Board
1 Marks
1. What is the conclusion of Davison and Germar experiment on the nature of electron?
(2015)
2. Mention any one type of electron emission.
(2019)
3. What is the rest mass of photon?
(2019s)
4. How does the stopping potential of a photosensitive material vary with intensity of incident
(2021m)
5. Write the expression for the de Broglie wavelength of a particle of mass m moving with a
speed v.
(2021m)
2 Marks
1. Write any two types of electron emission?
(2014)
2. Mention two applications of infrared radiation.
(2015)
3. Define:
i)
Photoelectric work function
ii)
Electron volt(ev)
(2016s)
4. What are De-Broglie Waves? How does the De-Broglie wavelength vary with momentum of
moving particle?
(2017s)
5. Write the expression for de-Broglie wave length of electrons interms of electric potential and
explain the terms used.
(2019)
6. An alpha particle, a proton and an electron are moving with equal kinetic energy. Which one
of these particles has the longest de Broglie wavelength? Give reason.
(2020)
3 Marks
1. Give three characteristics of photon.
(2014)
2. What are matter waves? Write the expression for De-Broglie wavelength of a particle and
explain the terms
(2016s)
3. Write the experimental observations of photo electric effect.
(2016,2018s)
4. Define the terms: a) Threshold frequency b) Work function
c) Stopping potential
(2017s)
5. Calculate de Broglie wavelength associated with an electron moving with a speed of 2 &times; 105
ms-1. Given h = 6.625 &times; 10-34 JS, m = 9.11 &times; 10-31 kg.
(2018s)
6. Write any three experimental observations of photoelectric effect
(2017,2019)
7. Name the three types of electron Emission. (2019s)
8. Define work function. Write Einstein’s photoelectric equation and explain the terms.
(2020)
5 Marks
1. Write Einstein’s equation of photoelectric effect. Give Einstein’s explanation of photoelectric
effect.
(2015)
2. Explain Hallwach’s and Lenard’s observations on photoelectric effect.
Define:
i)
Work function
ii)
Threshold frequency
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(1+5=6)
For: PU Board
3.
4.
5.
6.
7.
iii)
Stopping potential.
(2015s)
Write the experimental observations of photo electric effect.(2016)
The work function of cesium metal is 2014 ev. When light of frequency 6 &times; 1014 Hz is
incident on the metal surface, photoemission of electrons occurs. Find
a) Energy of incident photons
b) Maximum kinetic energy of photoelectrons.
Given, Planck’s constant h = 6.63 &times; 10-34 Js, 1 ev = 1.6 &times; 10-19
(2014s)
14
Light of frequency 8.41 &times; 10 Hz is incident on a metal surface. Electrons with their
maximum speed of 7.5 &times; 105 ms-1 are ejected from the surface. Calculate the threshold
frequency for photoemission of electrons. Also find the work function of the metal in electron
volt (eV). Given Planck’s constant h = 6.625 &times; 10-34 JS and mass of the electron 9.1 &times; 10-31
Kg.
(2018)
14
Light of frequency 7.21 &times; 10 Hz is incident on a metal surface. The cut-off wavelength for
photoelectric emission from the metal surface is 540 nm.
Determine the maximum speed of the photoelectrons emitted from the surface.
(Given: h =6.63 &times; 10-34 Js, mass of an electron = 9.1 &times; 10-31 kg).
(2021m)
The work function of caesium is 2.14 eV. Find
(a) the threshold frequency for cesium and
(b) the wavelength of the incident light if the photocurrent is brought to zero by a stopping
potential of 0.60V.
(2021m)
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Atoms
(1+5=6)
For: PU Board
1 Marks
1. Name the spectral series of hydrogen which lies in the ultraviolet region of electromagnetic
spectrum
(2015)
2. Name the spectral series of hydrogen atom in the visible region of electromagnetic spectrum.
(2015s)
3. Write the expression for energy of an electron in electron orbit of hydrogen atom (2019)
4. Name the series of hydrogen spectrum that lies in visible region.
(2021m)
5. Mention any one limitation of Bohr’s atomic model.
(2021m)
2 Marks
1. Draw the diagram representing the schematic arrangement of Geiger-Marsden experimental
setup for the alpha particle scattering.
(2018)
3 Marks
1. Write Bohr’s postulates for the hydrogen atom model.
(2018)
2. Write the three postulates of Bohr’s atomic model
(2019)
5 Marks
1. Write three postulates of Bohr model with two limitation
(2014)
2. By assuming Bohr’s postulates derive an expression for radius of nth orbit of electron,
revolving round the nucleus of hydrogen atom.
(2015)
3. Calculate the shortest and longest wavelength of balmer series of hydrogen atom
(Given r = 1.097 &times; 107 m-1)
(2016)
0
4. The first member of the balmer series of hydrogen atom has wavelength of 6563 A .
Calculate the wavelength and frequency of the second member of the same series.
Given: C = 3 &times; 108 ms-1.
(2017)
5. Derive an expression for the total energy of an electron in stationary state of hydrogen atom.
Assuming the expression for the radius.
(2017s,2018s,2019s,2021m)
6. Using Bohr’s postulates, derive the expression for the radius of nth stationary orbit of electron
in hydrogen atom. Hence write the expression for Bohr radius
(2020,2021m)
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3.
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Nuclei
(1+3=4)
For: PU Board
(1 marks)
1. State the radioactive decay law.
(2014)
2. What are isotopes?
(2014s,2019s)
3. Define specific binding energy.
(2015)
4. Write the S.I unit of radioactivity.
(2015s)
5. In the following nuclear reaction identity the particle X.
(2016)
6. What is the ratio of the nuclear densities of two nuclei having mass numbers in the ratio 1:3?
(2016s)
7. Define half life of a radioactive sample. (2017s)
8. The decay of proton to neutron is possible only inside the nucleus. Why?
(2018)
9. 92U238 undergoes 𝛼 −decay giving rise to thorium. What is the mass number of the daughter
nuclide?
(2018s)
10. Write the relation between Half-life and Mean-life of radio-active element
(2019)
238
11. Write the nuclear reaction equation for alpha decay of 92𝑈
(2020)
12. Write the relation between radius of the nuclei and its mass number.
(2021m)
13. Give an example for conversion of mass to energy.
(2021m)
1.
1.
2.
3.
1.
2.
3.
4.
5.
6.
(2 marks)
What are isotopes and isobars?
(2016)
(3marks)
State any three features of nuclear force.
(2014s,2016,2018,2021m)
Define half-life period of a radioactive sample. Arrive at the relation between half life and
decay constant.
(2014s,2018)
Write any three differences between nuclear fission and nuclear fusion.
(2021m)
(5 marks)
Calculate the binding energy and binding energy per nucleon (in MeV) of a nitrogen nucleus
from the following data:
Mass of proton = 1.00783 u
Mass of neutron = 1.00867 u
Mass of nitrogen nucleus = 14.00307 u.
(2014)
Determine the mass of Na22 which has an activity of 5mCi. Half life of Na22 is 2.6 years.
Avogadro number = 6.023 &times; 1023 atoms
(2015)
Calculate the half life and mean kife of Radium – 226 of activity 1Ci: given the mass of
radium -226 is 1 gram and 226 gram of radium consists of 6.023 &times; 1023 atoms. (2015s)
The activity of a radioactive substance is 4700 per minute. Five minute later the activity is
2700 per minute. Find
a) Decay constant and
b) Half –life of the radioactive substance.
(2016s)
-𝜆t
State radioactive decay law. Derive N = N0e for a radioactive element.
(2017)
Calculate the Binding energy and binding energy per nucleon of an oxygen nucleus
( 168𝑂)using the following Data (MeV):
(2017s)
Mass of proton = 1.007825 u
Mass of neutron = 1.008665 u
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Nuclei
(1+3=4)
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Mass of oxygen nucleus = 15.995 u.
7. The half life of a radioactive sample 38Sr90 is 28 years. Calculate the rate of disintegration of
15 mg of this isotope.
Given Avogadro number = 6.023 &times; 1023.
(2018s)
9
8. Half life of U-238 undergoing α-decay is 4.5 &times; 10 years. What is the activity of one gram of
U-238 sample?
(2019)
9. Calculate the Binding energy of an α (alpha) particle in MeV using the following Data
Mass of Helium nucleus = 4.00260 u
(2019s)
Mass of neutron = 1.008662 u
Mass of proton = 1.007825 u
10. A copper coin has a mass of 63.0 g. calculate the nuclear energy that would be required to
separate all the neutrons and protons from each other. The coin is entirely made of 63
29𝐶𝑢
atoms.
Mass of 63
29𝐶𝑢 atom = 62.92960 u
Mass of proton = 1.00727 u
Mass of neutron = 1.00866 u
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3.
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Semiconductor Electronics
(3+5=8)
For: PU Board
(1 marks)
1. Write the truth table of logic OR gate.
2. Mention any one application of light emitting diode (LED)
3. Write the circuit symbol of AND gate.
4. Inputs of NAND gate are A = 1, B = 0 what is the output?
5. Draw the circuit symbol of pnp transistor
6. Define current amplification factor in a common –emitter mode of transistor.
7. Write the truth table of NAND gate.
8. Give the circuit symbol of AND-gate
9. Draw the logic symbol of NOR gate.
(2014)
(2014s)
(2014s)
(2015s)
(2016)
(2016s)
(2016s)
(2017s)
(2020)
(2 marks)
1. What is photo diode? Mention its one use.
(2015)
2. What are intrinsic semiconductor? Name the element used as a dopant to obtain P-type
semiconductor.
(2015s)
3. Write the logic symbol and truth table of NAND gate.
(2016,2017)
4. How is Zener diode used as voltage regulator?
(2014,2017s)
5. Give a three difference between n-type and p-type semi conductors.
(2014s,2016s,2017,2019)
6. Distinguish between conductor and semiconductor on the basis of band theory of solids
(2015)
7. Define input resistance, output resistance and current amplification factor of a transistor
(2015s)
8. What is an amplifier? Draw the simple circuit of transistor amplifier in CE mode. (2016)
9. Write any two advantages of Light Emitting Diode (LED) over conventional in candescent
low power lamps. (2018s)
10. Give the two differences between Collector region and Emitter region of a Transistor. (2019s)
11. Give three differences between intrinsic and extrinsic semiconductors
(2020)
(3 marks)
1. How zener diode is used as a voltage regulator? Explain.
(2018s)
2. Explain ‘Conduction band’ ‘Valence band’ and ‘Energy band’, in semi-conductors (2019)
3. What is NAND gate? Write its logic Symbol and Truth Table.
(2019s)
4. Give any three differences between n-type and p-type semiconductors.
(2021m)
5. Distinguish between conductors, insulators and semiconductors based on the band theory of
solids.
(2021m)
(5 Marks)
1. Explain the formation of energy bands in solids. On the basis of energy bands distinguish
between a metal, a semiconductor and an insulator.
(2014)
2. Explain the working of p-n junction diode as a full wave rectifier with circuit diagram. Give
input and output waveforms.
(2014s)
3. With a neat circuit diagram, explain the working of an npn transistor in CE mode as an
amplifier with input and output waveform.
(2015,2017s)
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Semiconductor Electronics
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4. What is rectification? Which relevant circuit diagram and wave forms, explain the working of
p-n junction diode as a full wave rectifier.
(2015s,2016,2017,2021m)
5. With the help of circuit diagram, explain the working of npn transistor as a common emitter
amplifier.
(2016s)
6. Describe with suitable block diagrams, action of pn-junction diode under forward and reverse
bias conditions. Also draw I-V characteristics. (2018s)
7. Explain the working of a n-p-n transistor in CE mode as an amplifier.
(2019)
8. What is rectification? Explain the working of a p-n junction diode as a half wave rectifier.
Draw the input and output wave forms.
(2019s,2020,2021m)
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3.
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