2012(A)
INTERMEDIATE PART — II (12Th Class)
(New Pattern)
PHYSICS-II 
Time allowed:20:Minutes
Maximum Marks: 17
OBJECTIVE

NOTE: Write answer  to questions on the objective answer sheet provided. For possible answers (A),(B),(C) and (D) to each question are given. You consider correct, fill the circle in front of (A),(B),(C) pr ( D) with pen ink to each question the answer sheet provided.

• Instruments used for the detection of the current :

(A) Galvanometer
(B) Ammeter
(C) Voltmeter
(D) Ohmmeter

• Inductance of the coil can be increased by using:
  

(A) Paramagnetic core
(B) Diamagnetic core
(C) Ferromagnetic core
(D) Antiferromagnetic core

• Hysteresis produced in the transformer in responsible for:

(A) Energy loss
(B) Step up process
(C) Step down process
(D) Electromagnetic induction

• At higher frequencies, which of the following plays a dominant role in RLC series circuit:

(A) Resistor
(B) Inductor
(C) Cpacitor
(D) Transistor

• Three phase A.C supply machine has:
  

(A) No terminal
(B) Two terminal
(C) Four terminal
(D) Six terminals

• Best magnetic material is made up of:

(A) Alnico V
(B) Iron
(C) Nickel
(D) Cobalt

• Gain of operational amplifier is independent of:

(A) Internal structure
(B) External structure
(C) Batteries
(D) Potential changes

• Logic gates can control some physical parameters like:

(A) Temperature pressure
(B) Current, Voltage
(C) Resistance, inductance
(D) Capacitance, impeance

• Aging process of the human body is slowed by motion at very high speed i.e according to:

(A) Newton
(B) Einstein
(C) Faraday
(D) Coulomb

What is the more careful calculation by warner Heisenberg?

(A) ∆E.∆th
(B) ∆ X.∆ph
(C) ∆X.∆ph
(D) ∆m.∆vh

• The value of Rydberg Constant is:

(A) 1.09x107m^-1
(B) 1.6x10^-19 C
(C) 1.05x10^-34 J.S
(D) 9.1x10^-31 Kg

• In mass spectrograph

(A)   
(B) B2
(C) V2
(D)   

• A particle made up of two up quarks and one down quark is:
  
  (a) Proton
  (b) Neutron
  (c) Boston
  (d) Lepton
• Sec/ohm is equal to:
  

(a) Farad
(b) Coulomb
(c) Joule 
(d) Ampere

• Millikan and Fletcher could determine the charge on oil droplets in:

(a) Thermal Equilibrium
(b) Electrical equilibrium
(c) Positive
(d) Constant

• If a resistor is transvered in the opposite direction of current then the change in potential is:
  

(a) Zero
(b) Negative
(c) Positive
(D) Constant

• Direction of the vector x  is same as:

(A) Force
(B) Mag. Field
(C) Electric Field
(D) Length of the conductor

2012(A)          
INTERMEDIATE PART-II (12th Class)
PHYSICS PAPER-II
Time allowed:2.40 Hours
Maximum Mark: 68
Subjective

NOTE: Write same question number and its part number in answers book, as given in the question paper.

Section-I

Q.No.2:Attempt any eight parts.

• Show that IeV=1.6x10^-19 J.
• Is E necessarily zero inside a charged rubber balloon if balloon is spherical?
• Give similarity and difference between Coulomb and Gravitational forces.
• Draw a circuit which will give a continuously. varying potential.
• State Kirchhoff's 1st  and 2nd rule.
• Do bends in a wire affect its electrical resistance?
• Is it possible to orient a current loop in a uniform magnetic field such that the loop  will not tend to rotate?
• How can a current loop be used to determine the presence of a magnetic field in a  given region of space?
• How can you use a magnetic filed to separate isotopes of a chemical element?
• A square loop of wire is moving through a uniform magnetic field. The normal to  the loop is oriented parallel to the magnetic field Is an amt induced in the loop?
• Can a step-up transformer increase the power level?
• Can a D.C. motor he turned into a D.C. generator ? What changes are required to  he done?

Q.No.3 : Attempt any eight parts

• A motor should not be overloaded. Why?
• How many times per second will an incandescent Lamp reach maximum  brilliance when connected to a 50Hz source? Explain.
• At what frequency will an inductor of 1.0H have a reactance 500Ω?
• Explain the conditions under which electromagnetic waves are produced from a source.
• Define modulus of elasticity. Show that the units of modulus of elasticity. and  stress are same.
• How would you obtain n-type and p-type material front pure silicon? Show it diagram.
• Define stress and strain. What are their SI units?
• Give four applications of a Photo diode.
• Why charge carriers are not present in the depletion region?
• Why ordinary Silicaon diodes do not emit light?
• Is it possible to create a single electron from Energy? Explain.
• It an electron and a proton have same de-Broglie wave length. which particle has  greater speed?

Q.No.4 : Attempt any six parts.

• Will the bright light eject more electrons from a metal surface than dimmer light of the same colour?
• Which has the lower energy quanta. Radio waves or X -rays?
• Bohr theory of Hydrogen atom is based upon several assumptions. Do any of these assumptions contradict Classical Physics?
• How can the spectrum of Hydrogen contain so many lines whereas Hydrogen mom contains one electron?
• Is energy conserved when an atom emits a Photon of light?
• What do you understand by Background Radiation? State two sources of this Radiations?
• If you swallow and α -source and β- source, which would he more dangerous to   you? Explain.
• What fraction of radioactive sample decays after two half lives elapsed?
•  Define Mass Defect and Binding Energy.             

Section-II

NOTE: Attempt any three questions.

Q.5 (a) Describe construction and working of a Potentiometer.   (5)
(b) A particle having a charge of 20 electrons on it fall through a potential difference of 100 volts. Calculate energy acquired by it in electron volts (ev) (e = 1.6 x 10^-19 C)   (3)

Q.6(a)  Determine the energy stored in the magnetic field of an inductor. (5)
(b) A power line 10.0m high carries a current of 200 A. hind the magnetic field of the wire on the ground.

Q.7(a) What is Doping? Describe the formation-type and p-type semiconductors?  (1,2,2) 
(b) A 100 µF capacitor is connected to an alternating voltage of 24V and frequency 50Hz. Calculate (a) The reactance of capacitor (h) The current in the circuit. (3) 

Q.8(a) What is Photo Electric effect? What are its experimental results? How Einstein
explained it on the bases of Quantum Theory? (1,2,2)
(b) Draw the symbols of logic gates for the following Boolean functions.  (3)
(i) X=        (ii) X=  Write their respective truth tables.

Q.9(a) Explain Stimulated Emission, Population inversion and Laser Action. (5)
(b) Find binding energy of a deuteron ( 21 H) nucleus.  (3)
m¹₁ H = 1.6726 x 10^-27 Kg
m¹° n = 1.7649 x 10^-27Kg
m³₁ H= 3.3435 x 10^-27Kg