Inter (Part-II) Faisalabad 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.

• Power factor is equal to:

(a) sin θ
(b) tan θ
(c) sec θ
(d) cos θ

• The amplitude modulated transmission waves have frequencies range:

(a) 540 Hz to 1600 Hz
(b) 540 kHz to 1600 kHz
(c) 540 Hz to 1600 MHz
(d) 88 MHz to 108 MHz

• Domains are existed in:

(a) Ferromagnetic materials
(b) Diamagnetic materials
(c) Paramagnetic materials
(d) Semi - conductors

• The input resistance of an op-amplifier is:

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

• AC can be converted into DC by:

(a) Transformer
(b) Rectifier
(c) Motor
(d) Capacitor

• The change in wavelength of scattered photon in Compton effect is:

(a) (1– cosh)
(b) 2 (1—cosθ)
(c) Mh: (1— cosθ)
(d) moc 2°2 (1–cosθ)

• The value of Stefan's constant is:

(a) 5.67 x 10-6wm-2k-4
(b) 5.67 x 104 wm-2k-4
(c) 5.67 x 10' wm-21‘d
(d) 5.67 x wm-2104

• Which is not characteristic of LASER?

(a) Monochromatic
(b) Coherent
(c) Intense
(d) Multi directional

• The mass of § particles is equal to the mass of:

(a) Proton
(b) Neutron
(c) Electron
(d) Photon

• The number of types of quarks are:

(a) 6
(b) 5
(c) 4
(d) 3

• The force between two similar unit charges placed one meter apart in air is:

(a) Zero
(b) One Newton
(c) 9 x 109N
(d) 9x104N

• The electric field lines are closer where the field is:

(a) Strong
(b) Weak
(c) Uniform
(d) Variable

• One Tesla is equal to:

(a) NAm-1
(b) An' Am'
(c) NAm
(d) NA-1 m-1

• If a charge is at rest in a magnetic field then force on charge is:

(a) Zero
(b) q (17 xT3)
(c) q V B sin 0
(d) qi/B cos°

• Emf is induced due to change in:

(a) Charge
(b) Current
(c) Magnetic flux
(d) Electric field

• The energy stored in an inductor is given as:

(a) LI2
(b) L12
(c) L21
(d) 121

Inter (Part-II) Faisalabad 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)

• Distinguish between electric field and field intensity.
• Do electrons tend to go to region of high potential or of low potential?
• What is difference between electrical potential energy and electrical potential difference?
• The time constant of a series RC-circuit is t = RC. Verify that an Ohm times Farad is equivalent to second.
• Suppose that a charge q is moving in a uniform magnetic field with a velocity v. Why is there no work done by the magnetic force that acts on the charge q?
• If a charged particle moves in a straight line through some region of space, can you say that the magnetic field in that region is zero? Explain.
• Distinguish between magnetic flux and magnetic flux density. Write their SI units.
• What is meant by sensitivity of galvanometer? How can a galvanometer be made more sensitive?
• Can a DC motor be turned into a DC generator? What changes are required to be done?
• When the primary of a transformer is connected to AC mains the current in it increases when secondary circuit is closed. Explain why?
• Does the induced emf in a circuit depend on the resistance of the circuit? Explain.
• Distinguish between AC generator and transformer.

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

• Do bends in a wire affect its electrical resistance? Explain.
• Describe a circuit which will give a continuously varying potential.
• A wire of length 10m has resistance 100S). If the wire is stretched to increase its length three times. What will be its new resistance?
• What is choke? Why it is used in AC circuit?
• Prove that f, = 211-VF
• What is meant by A.M and F.M?
• Define (a) Elastic limit (b) Yield point
• Differentiate between brittle and ductile substances with examples.
• Describe energy band picture of semi - conductors.
• Why ordinary silicon diodes do not emit visible light?
• Write any two characteristics of operational amlifier.
• Draw the symbol and truth table of NOR gate.

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

• Distinguish between inertial frame of reference and non - inertial frame of reference.
• As a solid is heated and begins to glow, why does it first appear red?
• Is it possible to create a single electron from energy? Explain.
• Define spectroscopy.
• What are the difference between laser light and ordinary light?
• What factors make a fusion reaction difficult to achieve?
• Why are heavy nuclei unstable?
• Define terms (a) mass defect (b) binding energy.
• Why Geiger counter is not suitable for fast counting?

SECTION-II

Attempt any THREE questions.

Question #5
(a) What is capacitor? Find the capacitance of parallel plate capacitor.
(b) A charge of 90c passes through a wire in 1 hour and 15 minutes. What is the current in the wire?

Question #6
(a) How can we convert the galvanometer into voltmeter and ammeter?
(b) A power line 10.0m high carries a current 200A. Find the magnetic field of the wire at the ground.

Question #7
(a) Explain the band theory of solids. How does it help to distinguish between conductor, insulator and semi-conductor?
(b) Find the value of the current and inductive reactance when A.0 voltage of 220V at 50Hz is passed through an inductor of 10H.

Question #8
(a) What is a transistor? Describe the use of transistor as an amplifier and calculate its voltage gain.
(b) What is the mass of a 70kg man in a space rocket travelling at 0.8c from us as measured from earth?

Question #9
(a) What are postulates of Bohr's model of the hydrogen atom. Show that radii of hydrogen atom are quantized?
(b) Find the mass defect and binding energy for tritium if the atomic mass of tritium is 3.016049U.

SECTION-III

Question #10.

(a) Attempt any FOUR parts:

• Define resistance and its unit.
• What is galvanometer?
• What are used of rheostat?
• What is principle of potentiometer?
• What are photo electrons?
• Define photo electric effect.
• Write truth table of NAND gate.
• What is shunt resistance?

(b) Write down the brief procedure to find out the resistance of a galvanometer by half deflection method.

OR

Write down the brief procedure of experiment to study the variation of electric current wity intensity of light using a photocell.

(c) Answer the questions given under the graph: