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 7,8,9 and 10
Unit-7
Very short answers(3-marks)
1. What is photoelectric effect?
2. What is meant by cut - off (or) stopping
potential?
3. What is meant by threshold frequency
in photoelectric effect?
4. Give any 2 laws of photoelectric
emission.
5. Define - work function.
6. What is a photoelectric cell?
7. Give the applications of photoelectric
cells.
8. What is the limitation of electron microscope?
9. Define - Frame of Reference.
10. What is inertial or unaccelerated frame
of reference?
11. What is non - inertial or accelerated
frame of reference?
12. What are the two fundamental
postulates of special theory of
relativity?
13. Explain the variation of mass with
velocity in relativity.
14. If a body moves with velocity of light,
what will be its mass? Comment on
your result (or) No material particle
can travel with velocity of light. Why?
Short answers(5-marks)
15. Explain how photoelectric effect is
studied by Hallwachs experiment.
16. Discuss the effect of potential
difference on the photoelectric
current.
17. Discuss the effect of frequency of
incident radiation on stopping
potential.
18. Give the laws of photoelectric
emission.
19. Explain
Einstein's
theory
of
photoelectric effect. (or) Obtain
Einstein's photoelectric equation.
20. Explain the construction and working
of photoelectric cell.
21. Derive an expression for De Broglie
wavelength of matter waves.
22. Obtain an expression for De Broglie
wavelength of an electron.
23. Explain wave mechanical concept of
atom. How does the concept confirm
Bohr's postulate?
24. Explain the construction and working
of an Electron microscope.
25. Explain length contraction in relativity.
26. Explain Time - dilation in relativity.
27. Explain the variation of mass with
velocity in relativity.
Unit-8
Very short answers(3-marks)
1. With example explain classification
of the nuclei in terms of its proton
number and neutron number.
2. Give the empirical relation of
nuclear radius.
3. Define - atomic mass unit (a. m. u).
Give its value in kg.
4. What is electron - volt (eV)? Give
its value in joule?
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
What is mass defect?
What is meant by binding energy?
What is nuclear force?
Define - Radioactivity. What are
radioactive elements?
Explain
Soddy
Fajan's
displacement laws with examples.
(or) Explain the three decay
processes of a radioactive nucleus
during radioactive disintegration
with examples.
State
Rutherford
Soddy
radioactive law of disintegration.
Define Mean - life.
Define - Activity. What is its unit?
Define Half - life.
Define - CURIE.
How are neutrons produced? Give
the reaction.
How does an unstable neutron
decay?
What is artificial radioactivity?
What is meant by Radio Carbon
Dating?
State and Define Unit of radiation
exposure.
What is meant by Artificial
transmutation? Give an example.
What is meant by Nuclear fission?
Give the fission - reactions with
Uranium isotope 92U235.
What is meant by chain reaction?
What is meant by critical size and
critical mass of fissile material?
25.
26.
27.
28.
What is a Nuclear reactor?
What is a breeder reactor?
What are the uses of reactors?
What is nuclear fusion? What is
thermonuclear energy?
29. What are cosmic rays?
30. What is meant by pair production
and annihilation?
Short answers(5-marks)
31. Show that nuclear density is
almost a constant for all the nuclei
(or) Obtain the value of nuclear
density.
32. Explain the variation of Binding
energy with mass number by a
graph and discuss its features.
33. Give the properties of  rays.
34. Give the properties of  rays.
35. Give the properties of  rays.
36. Obtain the relation between Half life period and decay constant.
37. Define and explain Mean life.
38. Give the properties of neutrons.
39. What is chain reaction? Explain
controlled and uncontrolled chain
reactions.
40. Explain the principle, construction
and working of atom bomb.
41. Explain the principle and working
of Hydrogen bomb.
42. Explain how Stellar energy is
produced by sun and stars.
43. Explain the Latitude effect of
cosmic rays.
44. Explain how the intensity of cosmic
rays changes with altitude (altitude
effect).
45. Explain how a cosmic ray shower is
formed.
Detailed answers(10-marks)
46. Explain the principle, construction
and working of Bainbridge mass
spectrometer
to
determine
isotopic masses of nuclei.
47. Obtain an expression to deduce
the amount of the radioactive
substance present at any moment
(or) State Rutherford - Soddy
radioactive law of disintegration.
Derive the exponential relation of
disintegration.
48. Explain the construction and
working of Geiger - Muller counter.
49. With a neat - sketch explain the
working of a nuclear reactor.
UNIT-9
Very short answers(3-marks)
1. What is a solid state electronic devices?
2. What is meant by valence band,conduction
band and forbidden gap?
3. What do you understand by the terms
Intrinsic and Extrinsic semiconductors?
4. What is meant by doping and dopants?
5. What are the different methods of doping
a semiconductor?
6. What is meant by Depletion region?
7. What is meant by potential barrier?
8. What is meant by rectification and
rectifier?
9. Which property of the junction diode is
used in the process of rectification?
10. What is meant by Zener voltage (or)
breakdown voltage?
11. Draw the circuit diagrams of Transistor
circuit configurations.
12. What is an amplifier?
13. What are the important parameters of an
amplifier?
14. What are the requisites for the good
design of an amplifier?
15. What is multistage or cascade amplifier?
16. What is the gain of a multistage amplifier?
17. What is the use of direct coupling?
18. Give the differences between positive and
negative feedback.
19. What are the advantages of negative
feedback?
20. What is meant by oscillator?
21. Explain the Barkhausen Criteria for
oscillators.
22. What is IC?
23. What are the advantages of IC?
24. State DE Morgan's theorems.
25. Which are called UNIVERSAL GATES? Why?
26. What
are
the
most
important
characteristics of OP - AMP?
Short answers(5-marks)
27. Give the differences between N - type and
P - type semiconductors.
28. Explain the working of PN Junction Diode
with special reference to Depletion region,
potential barrier.
29. Explain the working of Half - wave Diode
rectifier.
30. Explain the working of Bridge rectifier.
31. Derive an expression for the voltage gain
of an amplifier with feedback (or) Explain
the effect of feed back on the gain of an
amplifier.
32. Describe the essential components (parts)
of an oscillator with block diagram.
33. Give the function OR GATE.
34. Give the function AND GATE.
35. Give the function NOT GATE.
36. Give the function EXOR GATE.
37. Give the function NAND GATE.
38. Give the function NOR GATE.
39. Prove DE Morgan's theorems.
40. Explain how the OP - AMP works in
inverting mode.
41. Explain how the OP - AMP works in non inverting mode.
42. Explain how OP - AMP works as summing
amplifier.
43. Explain how OP - AMP works as Difference
amplifier.
Detailed answers(10-marks)
44. Describe the energy band structure of
insulator, semiconductor and conductor.
45. Describe an experiment to determine the
characteristics of a transistor in CE
configuration. Explain how the transistor
parameters can be evaluated.
46. Explain the construction and working of
single stage CE amplifier with special
reference to frequency response and
bandwidth.
47. Explain the construction and working of
Colpitt oscillator.
48. Explain the construction and working of
Multimeter.
UNIT-10
Very short answers(3-mark)
1.
2.
3.
4.
5.
6.
7.
8.
What is meant by skip distance?
What is meant by skip zone?
Define – modulation?
What is meant by amplitude modulation?
Define – Modulation factor?
Define – Bandwidth or channel width?
What is meant by frequency modulation?
What is meant by frequency deviation and
carrier swing in FM?
9. What is the phase modulation?
10. What is meant by sensitivity and selectivity
of a receiver?
11. What is Analog Communication? Explain
with its shortcomings.
13.
14.
15.
16.
17.
18.
Short answers(5-marks)
12. Explain the process of reflection of
electromagnetic waves by ionosphere?
Give the mathematical analysis of
19.
20.
amplitude
modulated
wave.Explain
frequency spectrum of AM wave.
Explain about frequency modulation give it
advantages and disadvantages?
Explain the process of AM Radio –
Transmission with block diagram.
Explain the construction of FM transmitter
with block diagram.
Explain the stages of simple (or) straight
radio
receiver,
what
are
its
disadvantages?
Explain the stages of AM superheterodyne
receiver with block diagram.
Explain
the
working
of
FM
superheterodyne receiver with block
diagram.
Explain the stages of monochrome TV
transmission with block diagram.
Explain the stages of monochrome TV
reception with block diagram.
21. Explain fiber optical communication? Give
its advantages and application?
Detailed answers(10-marks)
22. Explain the process of Transmission and
reception of Radar.
23. Explain the various stages of satellite
communication with a neat diagram/ give
its merits and demerits.