PHYSICS Guess Questions, 12th Board Exam.- 2016 (CBSE, ICSE & State Board) by VIERT Physics Institute/Classes/Coaching; Ph:9430114411 (WhatsApp & Hike also)

PHYSICS ( CBSE, ICSE & State Board)
Guess Questions, Board Exam. 12th - 2016
1. a) State and prove Gauss’s theorem.
b) Find expression for electric field at a point
due to infinitely long straight wire.
c) Find expression for electric field due to a
plane charged sheet.
d) Find expression for electric field at a point
inside (outside & on ) a charged spherical
shell.
e) Derive an expression for torque acting on
a dipole which is placed in uniform electric
field.
2. a) What is capacitance and capacitor?
Derive expression for equivalent capacitance
when
three capacitors are connected in series.
b) Find equivalent capacitance of capacitors
when three capacitors are connected in
parallel.
c) Derive an expression for capacitance of a
parallel plate capacitor with a dielectric
medium
between the plates.
3. Explain principle, construction and
working of ---
a) Van de Graph generator
b) Cyclotron
c ) Meter Bridge or Slide wire Bridge
d) A. C. Generator
e) Transformer (step up and step down )
4. a) Find expression for electric current in
terms of drift velocity .
b) Explain colour codes of carbon resistors .
c) Derive expression for equivalent resistance
when more than two resistors are connected
in
series and parallel.
d) State and prove Kirchoff’s law.
e) State and prove the principle of Wheat
Stone Bridge.
5. a) Explain Biot - Savart’s law.
b) State and Explain Ampere’s Circutal Law.
c) Find expression for force acting between
two parallel current carrying conductors .
Define
Ampere.
d) How will you convert a moving coil
galvanometra into an Ammeter .
e) How will you convert a Moving Coil
Galvanometer into a Voltmeter .
f) Derive an expression for torque acting on
a magnetic dipole placed in uniform
magnetic field.
6. a) Explain -
Electromagnetic induction, Lenz law, Self
induction and Mutual induction,
Alternating current
b) Derive expression for R.M.S value of A.C.
c) Derive expression for impedance in purely
resistive circuit, purely capacitive circuit and
purely
inductive circuit.
d) Derive expression for impedance in L.C.R
series circuit.
7. a) Explain Electromagnetic waves and
their characteristics .
b) Find relation between object distance,
Image distance and radius of curvature of
convex
spherical surface.
c) Explain Critical angle, total internal
reflection and power of lens.
d) Explain different types of Defect of Vision
and their remedies.
e) State and explain Huygen’s principle.
f) What is interference of light? Find
expression for conditions for obtaining bright
and
dark fringe and expression for fringe width.
g) What is diffraction? Find expression for
width of central maximum.
h) Explain polarisation and prove Brewster’s
law.
8 a) What is photo electric effect and photo
electric current and
Discuss Einstein Photo Electric equation .
b) What is radio activity ? Explain radio
active decay law.
c) Explain – mass energy relation, mass
defect, Binding energy per nucleon, nuclear
fission
and fusion.
d) Explain conductor, semiconductor and
insulator on the basis of energy band
diagram.
e) Explain forward and reverse bias of P-N
junction diode.
f) Explain LED, Photo diode, solar cell, Zenor
diode.
g ) Explain – OR Gate , AND Gate, NOT gate,
NAND gate and NOR gate.
h ) Explain the principle of a Transistor and
an Amplifier in common emitter
configuration.
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