Inter (Part-II) Sargodha Board 2016
Physics
Part II (Objective Type)
Time Allowed: 20 Minutes 
Max. Marks: 17

Note: You have four choices for each objective type question as A, B, C and D. The choice which you think is correct; fill that circle in front of that question number. Use marker or pen to fill the circles. Cutting or filling two or more circles will result in zero mark in that question.

Question #1
Circle the correct option i.e. A/B/C/D. Each part carries one mark.

• If the separation between the plates of a capacitor is doubled then its capacitance become:

(a) Double
(b) Half
(c) One fourth
(d) Three times

• One electron volt is equal to:

(a) 1.6x 10^-19 Joul
(b) 1.6 x10^-19 Coulomb
(c) 1.6x10^-19N
(d) 1.6 x 10¹⁸ Joul

• Temperature coefficient of resistance (a) is equal to:

(a)                      
(b)
(c)  
(d) None of these

• Brightness of screen of CRO controlled by:

(a) Anode
(b) Filament
(c) Cathode
(d) Grid

• Torque is produced in a current carrying coil when it is placed in a:

(a) Magnetic field
(b) Electric field
(c) Gravitational field
(d) Nuclear field

• Eddy currents is one cause of energy loss in:

(a) A.C generator
(b) Transformer
(c) D.C motor
(d) D.C generator

• Unit of self Inductance is:

(a) Weber
(b) Tesla
(c) Henry
(d) Farad

• The reactance of capacitor is equal to:

(a) ω
(b)ω/c
(c) c/ω
(d) 1/ωc

• The phase difference between current and voltage in an Inductive circuit is:

(a) Zero
(b) 90°
(c) 180°
(d) 45°

• The critical temperature (7; ) of Igad is:

(a) 7.2 k
(b) 3.72 k
(c) 125 k
(d) 77 k

• In full wave rectification no of diodes required are equal to:

(a) 3
(b) 4
(c) 5
(d) 1

• Output resistance of an op-amp is:

(a) High
(b) Zero
(c) Low
(d) Equal to input resistance

• Compton effect proves:

(a) Wave nature of radiation
(b) Wave nature of particle
(c) Dual name of particle
(d) Particle nature of radiations

• Mass of photon is equal to:

(a) Mass of electron
(b) Zero
(c) Mass of proton
(d) Mass of neutron

• The relation for paschen series is given as:

(a)   
(b)
(c)   
(d)

• Relation for half life of any radioactive element is:

(a) T_1/2 = λ(0.693)
(b) λ=T_1/2(0.693)
(c) T1/2= 0.693/λ
(d) T1/2= λ/0.693

• Speed of II particles is nearly equal to:

(a) 110⁸m/s
(b) 110⁷m/s
(c) 310⁸m/s
(d) 110⁶m/s

Inter (Part-II) Sargodha Board 2016
Physics
Part II (Subjective)
Time Allowed: 3.10 Hours 
Max. Marks: 83

Section I

2. Attempt any EIGHT short questions. (8 x 2 = 16)

• How can you identify that which one plate of a capacitor is positively charged.
• Is necessarily zero inside a charged rubber balloon if balloon is spherical? Assume that charge is distributed uniformly over the surface? Explain.
• If a point charge q of mass m is released in a non-uniform electric field with field lines pointing in the same direction, will it make a rectilinear motion? How?
• A particle carrying a charge of 2e falls through a potential difference of 3.0 V. Calculate the energy acquired by it.
• Why does the picture on a TV screen become distorted when a magnet is brought near the screen.
• How can you use a magnetic field to separate isotopes of chemical element.
• Why the resistance of an ammeter should be very low?
• (viii)Define Iorentz Force. Write its formula.
• Does the induced emf always act to decrease the magnetic flux through a circuit? Explain.
• A suspended magnet is oscillating freely in a horizontal plane. The oscillations are strongly damped when a metal plate is placed under the magnet. Explain why this occurs?
• Show that and t have the same units.
• Define henry. Write its S.I units.

3. Attempt any EIGHT short questions. (8 x 2 = 16)

• What are the difficulties in testing whether the filament of lighted bulb obeys Ohm's law?
• Why does the resistance of a conductor rise with temperature?
• Differentiate between ohmic and non ohmic devices with examples.
• How the reception of a particular radio station is selected on your radio set?
• In RL-circuit, will the current lag or lead the voltage? Illustrate your answer by a vector diagram.
• What is meant by A.M and F.M?
• Define stress and strain. What are their SA units?
• (viii)Distinguish between critical and curei temperatures.
• Energy dissipated per cycle for steel is more as compared to iron. Why?
• Why the charge carries are not present in the depletion region?
• Why is the base current in a transistor very small?
• What is the principle of virtual ground of operational amplifier?

4. Attempt any SIX short questions., (6 x 2 = 12)

• What advantages an electron microscope has over an optical microscope?
• Can pair production take place in vacuum? Explain.
• What do you mean by annihilation of matter?
• How can the spectrum of hydrogen contain so many lines when hydrogen contains one electron?
• Define the terms: (b) Population inversion (a) Metastable state
• Distinguish between nuclear fission and nuclear fusion.
• What do you understand by background radiation?
• Explain the working of control rods in a nuclear reactor.
• If U²³³₉₂decays twice by -emission what is the resulting isotope?

SECTION-II

Attempt any THREE questions. (8 x 3 = 24)

Question #5
(a) State Coulomb's Law. Explain its mathematical and vector form.
(b) How many electrons pass through an electric bulb in one minute if the 300 A current is passing through it.

Question #6
(a) State Ampere's Law. Determine flux density due to current in a solenoid?
(b) A square coil of side 16 cm has 200 turns and rotates in a uniform magnetic field of magnitude 0.05 T. If the peak emf is 12 volt. What is angular velocity of the coil?

Question #7
(a) Describe the behaviour of RC and RL series circuits with an A.0 source. Calculate the impedance of both the circuits by drawing their impedance diagram.
(b) 1.0 m long copper wire is subjected to stretching force and its ength increases by 20 cm. Calculate the tensile strain and the percent elongation which the wire undergoes.

Question #8
(a) What is operational amplifier? Describe the use of an operational amplifier as a non-investing amplifier.
(b) An electron is placed in a box about the size of an atom that is about 1.0 x 10^-10 What is the velocity of an electron?

Question #9
(a) Define spontaneous and stimulated emissions. Explain laser action in detail.
(b) The half life of ⁹¹₃₈.gr is 9.70 hours. Find its decay constant..

SECTION-III

Question #10
(A) Attempt any four parts.

• What is shunt?
• What is unit of potential difference define it.
• What is effect of temperature on resistance. Expalin it.
• What is internal resistance?
• Write truth table of AND gate.
• Define capacitance and its unit.
• What is power supply?
• What is Photo Cell? Give its one use.

(B) Write down the brief procedure of experiment to find out resistance of a wire by slide wire bridge.
OR
Write down the brief procedure of experiment to verify the truth table for OR gate.

(C) Graph A (i) What do you infer from graph. (ii) Find out the slope of graph.
OR
Graph B (i) What do you infer from graph.

(ii) Find out resistance of galvanometer from graph.

Graphs