BASHA ACADEMY
(WEBSITE:www.bashaacademy.com)
NEW NO: 14, OLD NO: 45, PROF. SANJEEVI STREET, MYLAPORE,CHENNAI-4.
PHONE NUMBER: 7708457611,9840571484
NOTE:The following questions have higher probability of repeatedly appearing in the
examinations.So it is advisable to give more attention to these FAQ questions and frequent
revisions.However a good student aspiring for centum in Physics is expected to study all the
questions .Completely ignoring the other questions is riskier.Practice these questions with
periodic revision.
LIST OF FAQ QUESTIONS IN PHYSICS UNIT 4,5,6
THREE MARK QUESTIONS
UNIT-4
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What is meant by induced emf, induced current and electromagnetic induction?
State I Faraday's law of electromagnetic induction.
State II Faraday's law of electromagnetic induction.
State Lenz's law.
State Fleming's right hand rule or generator rule.
Define self - inductance (or) Co-efficient of self - induction. Give its unit.
Define mutual inductance (or) Co-efficient of mutual inductance. What is its unit?
State and define the unit of self - inductance.
What are the factors on which the co-efficient of mutual induction depends upon?
Suggest the methods of producing induced emf.
What are Eddy currents?
Give the differences between the step up and step down transformers.
Can a transformer be used for stepping up DC? Explain.
Define RMS value of ac.
Why cannot a DC ammeter read AC?
Define Q-factor.
What is acceptor circuit?
UNIT-5
1. What are electromagnetic waves?
2. Give the uses of different types of electromagnetic waves?(any one of seven waves)
3. What is meant by Emission spectrum?
4. Distinguish emission and absorption spectra.
5. What is fluorescence?
6. What is Phosphorescence?
7. What is meant by quantum or photon? Give the expression for its energy.
8. State Rayleigh scattering law.
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Why does the sky appear blue?
Why does sun appear reddish at sunrise and sunset?
What is Stoke's and Anti-Stoke's lines?
Give any two applications of Raman spectrum.
Define wave front.
Give the differences between spherical and plane wavefront.
State Huygen's principle for the formation of wavefront.
What is total internal reflection?
What is meant by critical angle?
What are the conditions required for Total internal reflection?
What are coherent sources?
What is diffraction?
Distinguish Fresnel and Fraunhofer Diffraction.
What is meant by grating element and corresponding points?
Give the differences between interference and diffraction.
What is meant by polarisation and plane polarisation light?
What is polariser and analyser? Give examples.
What is meant by partially plane polarised light?
What is meant by polarising angle? give its value for glass.
State Brewster's law.
What is optic Axis?
What are uniaxial crystals? Give examples.
What are Biaxial crystals? Give examples.
What is optical activity or optical rotation?
What are the factors on which the optical rotation depends upon?
Define - specific rotation.
UNIT-6
What are cathode rays?
What are positive rays?
Why are positive rays called canal rays?
What is Prout suggestion? Why has it failed?
What are the drawbacks of Rutherford atom model?
Give Bohr's postulates.
What is Lyman series?give its expression.
What is Balmer series?give its expression.
What is Paschen series?give its expression.
What is Brackett series?give its expression.
What is Pfund series?give its expression.
What is meant by ionisation potential and ionisation potential energy? Give its value for
hydrogen.
What is meant by Stark effect and Zeeman effect?
What are soft and hard X - rays? (or) Give the differences between soft X - rays and Hard X rays.
Why cannot ordinary plane transmission grating be used to produce diffraction effects in X rays?
State Bragg's law.
What is Moseley's law?
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What are the characteristics of Laser?
What is meant by normal population?
What is population inversion?
What are metastable states?
What are the conditions to achieve Laser action?
What is Holography? Explain.
FIVE MARK QUESTIONS
UNIT-4
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Derive an expression for the self - inductance of a long solenoid.
Derive an expression for the energy associated with an inductor.
Derive an expression for mutual inductance of two long solenoids.
Derive the expression for the emf induced by changing the area closed by the coil.
Explain the construction and working of three phase Generator.
Explain the applications of Eddy currents.
Explain the various energy losses in a transformer and how they are minimised.
Explain about the various aspects of series or voltage resonance in RLC circuit. Explain its
application as Acceptor circuit.
26. What is Acceptor circuit? Explain the Q - factor of Acceptor.
27. Derive an expression for the average power in an ac circuit.
28. Explain the construction and working of Choke coil.
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UNIT-5
Mention the characteristics of electromagnetic waves?
Describe Hertz experiment.
Explain the types of Emission spectra?
Write a note on Fraunhofer lines.
Write a note on Young’s double slit experiment
Derive an expression for the radius of nth dark ring of Newton's Rings.
Explain the applications of Newton's rings.
State and prove Brewster's law.
Give the differences between O-Ray and E-Ray.
Write a note on Nicol prism?
Explain principle, construction and working of pile of plates.
Write a note on Polaroids?
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UNIT-6
Write the properties of cathode rays.
Write the properties of canal rays.
Explain the theory of Thomson Atom model. Give its drawbacks.
Explain Rutherford's  - scattering experiment. Also explain its observation and conclusions.
Derive an expression for the distance of closet approach in  - scattering.
Explain the suggestions and drawbacks of Rutherford atom model.
Derive an expression for the radius of nth electron orbit.
Derive an expression fort the energy of the electrons in the nth orbit.
9. Derive an expression for the frequency of the spectral line and also Rydberg's equation for
hydrogen spectrum.
10. Explain the spectral series of hydrogen atom.
11. State and obtain Bragg's law.
12. Explain how the wavelength of monochromatic X - rays is determined by Bragg's
spectrometer.
TEN MARK QUESTIONS
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UNIT-4
Explain Faraday's experiments of electromagnetic induction.
Discuss with theory the method of inducing emf in a coil by changing its orientation with
respect to the direction of the magnetic field.
Explain the construction and working of a simple phase AC Generator.
What is a transformer? Explain its principle theory of working and efficiency.
Obtain an expression for the current flowing in a circuit containing resistance only to which
alternating emf is applied. Find the phase relationship between voltage and current and
power.
Obtain an expression for the current in an ac circuit containing a pure inductance. Find the
phase relationship between voltage and current.
Obtain an expression for the current flowing in the circuit containing capacitance only to
which alternating emf is applied. Find the phase relationship between voltage and current and
power.
Derive an expression for effective voltage, impedance and phase angle in RLC circuit.
UNIT-5
Explain about Raman effect.
Explain the phenomenon of Reflection on the basis of Huygen's principle.
Explain the phenomenon of Refraction on the basis of Huygen's principle.
Derive an expression for Band width of interference fringes.
Explain how Newton's Rings are experimentally observed. Also give the theory of formation of
rings.
Explain the theory of diffraction grating.
Explain how the wavelength of monochromatic light is determined using Transmission grating.
UNIT-6
Explain how the specific charge of electron is determined by THOMSON’S METHOD.
Explain how the charge of an electron is determined by Millikan's oil drop method.
Explain how X - rays are produced by coolidge tube.
Explain the construction and working of Ruby Laser.
Explain the construction and working of Helium - Neon Laser.