Inter (Part-II)
Gujranwala Board 2014
Physics (New Scheme)
Paper : II (Objective)
Time: 20 Minutes
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 with marker or pen on the answer book provided. Cutting or filling two or more circles will result in zero mark in that question. Attempt as many questions as given in objective type question paper and leave others blank.

• The rest mass of an electron is

(A) 6.7 MeV
(B) 5.11 MeV
(C) 0.511 MeV
(D) 0.051 MeV

• X-rays can be

(A) reflected
(B) Diffracted
(C) polarized
(D) all of these

• Balmer series lies in

(A) ultraviolent region
(B) visible region
(C) Infra red region
(D) all of these

• Strong nuclear force acts on

(A) meson only
(B) pions only
(C) photons only
(D) Hadrons only

• Which one is used to study the circulation of blood?

(A) Iodine-131
(B) Sodium-24
(C) cobalt-60
(D) Strontium-90

• The impedance of R-C series A.C. circuit is given by Z = --------

(A)                   
(B) R2+(ωC)²
(C)
(D)           

• Which one is not a ferromagnetic substance?

(A) cobalt
(B) copper
(C) nickle
(D) iron

• Gain of OP-AMP as inverting amplifier is given by G = ---------------

(A)        
(B)       R1 x R2
(C)       -
(D)       - 

• The magnitude of open loop gain of OP-amplifier is of the order of

(A) 10³
(B) 10⁵
(C) 10⁷
(D) 10⁹

• The A.C circuit in which current and voltage are in phase, the power factor is

(A) zero
(B) 1
(C) 0.5
(D) infinity

• The work is stored in an inductor as

(A) kinetic energy
(B) elastic potential energy
(C) magnetic potential energy
(D) gravitational potential energy

• One Henry is equal to

(A) Vs^-1A^-1
(B) Vs^-1 A
(C) Vs A^-1
(D) Vs A

• For an electro, e/m is given by

(A) 
(B)
(C)
(D) V Br

• Which one is a photo conductor?

(A) copper
(B) selinium
(C) mercury
(D) aluminium

• In a capacitor, energy is stored in the

(A) magnetic field
(B) electric field
(C) gravitational field
(D) nuclear field

• The graphical representation of Ohm’s Law is

(A) hyperbola
(B) Ellipse
(C) parabola
(D) straight line

• the unit of magnetic flux is

(A) Curie
(B) Weber
(C) Newton
(D) Farad

Inter (Part-II)
Gujranwala Board 2014
Physics (New Scheme)
Paper : II (Subjective)
Time: 3.10 Hours
Marks: 83
Note:Section I and II are compulsory. Attempt any three (3) questions from Section II.

(Section-I)

2. Write short answers to any EIGHT questions: (2x8=16)

• How can you identify which plate of a capacitor is positively charged?
• Suppose that you follow an electric field line due to a positive point charge. Do electric field and the potential increase or decrease?
• Electric lines of forces never cross. Why?
• What is potential at the midpoint of line joining two opposite equal charges?
• what is Lorentz force?
• How can you use a magnetic field to separate isotopes of chemical element?
• Why the resistance of an ammeter should be very low?
• Is it possible to orient a current loop in a uniform magnetic field such that the loop will not tend to rotate? Explain.
• What is back emf?
• Show the ε and have the same units.
• Can step up transformer increase the power level?
• How would you position a flat loop of wire in a changing magnetic field so that there is no emf induced in the loop?

3. Write short answers to any EIGHT questions: (2x8=16)

• How the reception of a particular radio station is selected on your radio set?
• how does doubling the frequency affect the reactance of an inductor and a capacitor?
• A 100 µ F capacitor is connected ta an alternating voltage of 24 volts and frequency 50Hz. Find its reactance.
• What is Curie temperature? Explain it with an example.
• Differentiate between elastic deformation and plastic deformation.
• Differentiate between ductile and brittle substances. Give an example for each.
• Why charge carriers are not present in the depletion region?
• Why ordinary silicon diode does not emit light?
• Why is the base current in a transistor very small?
• Why does the resistance of conductor rise with temperature?
• What are the difficulties in testing whether the filament of lighted bulb obeys Ohm’s law?
• A charge of 90 coulomb passes through a wire in one hour and fifteen minutes minutes. What is the current in the wire?

4. Write short answers to any EIGHT questions: (2x6=12)

• Find the de-Broglei wavelength of a proton moving at a speed of 40 m/sec.
• A beam of red light and a beam of blue light have exactly the same energy. Which beam contains the greater number of photons? Explain.
• State the postulates of special theory of relativity.
• What do you mean when we say that the atom is excited?
• define spectroscopy.
• What are isotopes? What do they have in common and what are their differences?
• Define half life of a radioactive element. Also write the relation between half life and decay constant.
• Differentiate between Hadrons and Leptons.
• A particle which produces more ionization is less penetrating. Why?

(SECTION-II)

5.(a) What is electric potential? Find the electric potential at a point due to a point charge. (5)

(b) The resistance of an iron wire at 0⁰C is 1 x 10⁴ Ω . What is the resistance at 500⁰C if the temperature co-efficient of resistance of iron is 5.2 x 10^-3 K^-1? (3)

6.(a) State Ampere’s law and find relation for magnetic field due to current carrying solenoid. (5)

(b) A square coil of side 16cm has 200 turns and rotates in a uniform magnetic field of magnitude 0.05T. If the peak emf is 12V, what is the angular velocity of coil? (3)

7.(a) Describe A.C. through a capacitive circuit and find the relation for the reactance of capacitor. (5)

(b) A wire 2.5 m long and cross-section area 10^-5 m² is stretched 1.5 mm by a force of 100 N in the elastic region. Calculate

(i) the strain (ii) Young’s modulus. (3)

8.(a) Explain use of diode as full wave rectifier. (5)

(b) A sodium surface is illuminated with light of wavelength 300nm.The work function of sodium metal is 2.46eV. (3)
(i) Find the maximum K.E of ejected electron.
(ii) Determine the cut off wavelength of the sodium.

9.(a) Discuss mass defect and binding energy and explain the stability of nuclei on the basis of binding energy. (5)

(b) The wavelength of K.Xray from copper is 1.377 x 10^-10 m. What is the energy difference between the two levels from which this transition results? (3)

(SECTION-III)
(Practical)

10.(a) Give answers to any four questions:

• What is resistance? Give its unit.
• What is ohm’s law?
• What is the effect of temperature on resistance?
• What is Thermistor?
• Is half deflection method an accurate an accurate one?
• Tungeston filament of bulb obeys Ohm’s law or not?
• What is photocell?
• Define work function.

(b) Write down brief procedure to determine the resistance of galvanometer by half deflection method. (3)

OR

Write down the brief procedure to make burglar alarm using NAND gate.

(c) Answer the questions given below on the basis of the following graph:

(i) What do you infer from graph?
(ii) Find the slope of graph.

OR

(i) Find the slope of graph.
(ii) What does graph show?