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

Note: Section-A is compulsory. All parts of this section are to be answered on the question paper itself. It should be completed in the first 25 minutes and handed over to the Centre Superintendent. Deleting/overwriting is not allowed. Do not use lead pencil.

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

• A radioactive decay rate of 3.7 x 1010 disintegrations per second defines the unit of measurement known as the:

(A) Curie
(B) Rutherford
(C) Rontgen
(D) Rad

• Two charges of 10µC and 14.4µC are 12cm apart. The force between them:

(A) 01 N
(B) 90N
(C) 9X10⁵
(D) 9X10⁷

• The minimum indivisible unit of charge is:

(A) One micro coulomb
(B) One coulomb
(C) The charge on α–Particle
(D) The charge on an electron

• The proportionality constant between current and potential difference is:

(A)1/p
(B) ƿ
(C)1/R
(D)R

• Which of the following properties affect the resistivity of all metals to a great extent:

(A) Applied magnetic field
(B) Pressure
(C) Volume
(D) Temperature

• The magnetic force on an electron traveling 10⁸ ms^-1 perpendicular to a field of strength 1 wbm^-2 is :

(A) 6 x 10^-11 N
(B) Zero
(C) 10⁵ N
(D) 1011 N

• If current in two mearby loops is in same order. Then:

(A)Attract and repel
(B) Atteact
(C) Repel
(D) Neither attracts nor repe

• The direction of induced current is always so as to oppose the change which causes the current. This is the statement of:

(A)Ampere’s law
(B) Faraday’s law
(C) Lenz’s law
(D) Gauss’s law

• Device that consume electrical energy in the external circuit of generator are known as:

(A)Appliances
(B) Loads
(C) Machines
(D) Motors

• Which of the following is NOT an advantage of using A.C:

(A)Maximum line losses
(B) Minimum line losses
(C) Low cost long distance Transmission
(D) Stopping up or down to required voltage

• Impedance of series circuit at resonance is :

(A)Inductive and Capactive
(B) Inductive
(C) Capactive
(D) Resistive

• The smallest -3 dimensional structure of crystalline solid which repeats over and over again is:

(A)Unit Cell
(B) Polymer
(C) Amorphous
(D) Crystal

• A Crystalline structure yattrium copper oxide (YBa₂Ca₃O₇) becomes upper conductor at:

(A)173 K
(B) 100K
(C) 163K
(D) 200K

• Photo diode in NOT used in?

(A)Photo voltaic cell
(B) Automatic Switching
(C) Detection O light
(D) Logic circuits

• The gain of inverting amplifier of external resitance R₁=50 kΩ and R₂=200kΩ:

(A)6
(B) 1
(C) 2
(D) -4

• The stefen-Baltzman law which relates of radiation for a black body to its surface temperature “T” has the form:

(A) E=oT²
(B) B=oT¹
(C) E= oT^-1
(D) E= oT^-2

• Molecular spectra are examples of:

(A) Solar spectra
(B) Continuous spectra
(C) Band spectra
(D) Line spectra

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

Note: Section ‘B’ and ‘C’ comprises pages 1-2 and question there in are to be answered on the separately provided answer book. Answer all question from Section ‘B’ and Section ‘C’. Use supplementary answer sheet i.e sheet B if required. Write your answer your neatly and legibly.

Question #2 Answer any FOURTEEN parts. The answer to each part should not exceed 3 to 4 lines (14 x 3 = 42)

• How can you identify that which plate of capacitor is positively charged?
• How do shark fish locate their prey precisely?
• Why does resistance of a conductor rise with temperature?
• Find the reading of the ammeter in the circuit diagram: fig
• If solenoid is 1 m long and 10cm in diameter and wound with 10 turns per cm of wire which carries a current of 100A Calculate the magnetic flux density within it.
• How can you use a magnetic field to separate isotopes of chemical elements?
• What do you understand by electromagnetic induction?
• Can a D.C motor be turned into a D.C generator? What changes are required to be done?
• What is meter by A.M and F.M?
• What is meant by strain energy? How can it be determined from the force-extension graph?
• How would you obtain n-type and p-type material from pure silicon? Illustrate it by schematic diagram
• What is meant by open loop gain of op-amplifier?
• Why a photo diods is operated in reverse biased state?
• Fine the velocity at which the relativistic length ‘L’ of a body reduces to half of its rest length ‘L’
• Photon A has twice the energy of photon B. What is the ration of the momentum of A to that of B?
• How can the spectrum of hydrogen contain so many lines when hydrogen contains one electron?
• Prove that the shortest wavelength photon emitted in Balmer series is 364.6nm?
• What is a mass spectrograph?

Section-C (Marks 26)

Note: Attempt any TWO question. (2 x 13 = 26)

Question #3
(a) Define electric field intensity and its unit Calcuiate the electric field intensity at a point in the electric field.
(b) Find the electric field strength required to hold suspended a particle of mass 10x10⁶ kg and charge 1µc between two plates 10cm a part?
(c) Describe the construction and working of photo copier machine.

Question #4
(a) State and explain Ampere’s law. Apply it to calculate the magnetic field due to current f lowing through a solenoid.
(b) What current should pass through a solenoid that 0.5m long with 10.000 turns of copper wire so that it will have a magnetic field of 0.4T?
(c) What is an AVO meter? Describe its any two functions.

Question #5
(a) What are X-rays? Describe the production of X-rays.
(b) Electrons in an X-ray tube are accelerated through a potential difference of 3000V. If these electrons are solwed down in a target what will be the minimum wavelength
of X-rays produced.
(c) What are continuous X-rays spectrum? Describe the properties and uses of X-rays.