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

Note: You have four choice 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.

• The open loop gain of amplifier is of the order of:

(a) 10⁵
(b) 10⁶
(c) 10⁴
(d) 10³

• We can find from de Broglie formula:

(a) Wavelength
(b) Amplitude of wave
(c) Speed of wave
(d) Frequency of wave

• Energy of black body radiation depends upon:

(a) Nature of surface of body
(b) Nature of material of body
(c)Shape and size of body
(d) Temperature of the body

• The following gas was identified in the sun using spectroscopy:

(a) Hydrogen
(b) Helium
(c) Carbon
(d) Nitrogen

• When Y -rays are emitted, the nuclear mass:

(a) Decreases by 4 units
(b) Does not change
(c) Increases by 2 units
(d) Increases by 1 units

• Which of the followings are not hadrons?

(a) Muons
(b) Mesons
(c) Protons
(d) Neutrons

• Selenium is a:

(a) Conductor
(b) Photoconductor
(c) Insulator
(d) Semiconductor

• Capacitance of a capacitor does not depend upon:

(a) Distance between plates
(b) Area of plates
(c) Electric field between plates
(d) Medium between plates

• Kirchhoff's voltage rule is a way stating conservation of:

(a) Energy
(b) Momentum
(c) Charge
(d) Angular momentum

• If F1 and F2 are forces acting on a -particle and electron respectively, when moving perpendicular to the magnetic field, then:

(a) F₁ = F₂
(b) F₁> F₂
(c) F_l < F₂
(d) F₁ = 4F₂

• Which of the following is not accurate measuring device?

(a) Digital multimeter
(b) CRO
(c) Potentiometer
(d) Voltmeter

• Self inductance does not depend upon:

(a) Number of turns of the coil
(b) Area of cross-section of the core
(c) Nature of material of the core
(d) Current through inductor

• Efficiency of transformer is not affected by:

(a) Input voltage
(b) Core of transformer
(c) Insulation between sheets
(d) Resistance of coils

• In RLC series circuit at resonance the phase difference between capacitor and inductor reactances is:

(a) 90°
(b) 270°
(c) 0°
(d) 180°

• Electrons vibrating 94,000 times each second will produce radio waves of frequency:

(a) 94Hz
(b) 940Hz
(c) 940KHz
(d) 94KHz

• Which of the following does not undergo plastic deformation?

(a) Copper
(b) Wrought iron
(c) Lead
(d) Glass

• The gain of transistor amplifier depends upon:

(a) Resistance connected with collector
(b) Resistance connected at base
(c) Input voltage
(d) Output voltage

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

SECTION-I

2. Attempt any EIGHT short questions. (8x2=16)

• Show that ԑ and ΔФ/Δt have same units.
• What is time constant?
• What is Lorentz force?
• Write down the four properties of electric field lines.
• What do you mean by Eddy current?
• Can a step-up transformer increase the power level?
• Why the resistance of an ammeter should be very low?
• Do electrons tend to go to region of high potential or of low potential?
• Why does the picture on a T.V screen become distorted when a magnet brought near the screen?
• Does the induced emf always act to decrease the magnetic flux through a circuit?
• How can you identify that which plate of a capacitor is positively charged?
• How can you use a magnetic field to separate isotopes of chemical elements?

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

• What is meant by Hysteresis pass?
• Define conventional current and electronic current.
• Why ordinary silicon diodes do not emit light?
• Define peak value and peak to peak value.
• Define crystalline solids and glassy solids.
• Define stress and strain.
• A sinusoidal current has rms value of 10A. What is the maximum or peak value?
• How does doubling the frequency effect the reactance of: (a) An inductor (b) A capacitor
• The anode of a diode is 0.2V positive with respect to its cathode. Is it forward biased?
• Is the filament resistance lower or higher in a 500W, 220V light bulb than in 100W, 220V bulb?
• What are the difficulties in testing whether the filament of a lighted bulb obeys Ohm's law?
• What is the net charge on a P -type or a 77 -type substance?

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

• When does light behave as a wave? When does it behave as a particle?
• What happens to total radiation energy from a black body if its absolute temperature is doubled?
• What advantages an electron microscope has over an optical microscope?
• What fraction of radioactive sample decay after two half lives have elapsed?
• What are background radiations? Name its two sources.
• What factors make a fusion reaction difficult to achieve?
• What do we mean when we say that atom is excited?
• Define: (a) Absorbed dose (b) Gray
• Define: (a) Population inversion (b) Metastable state

SECTION-II

:Attempt any THREE questions. (8 X 3 = 24)

Question #5
(a) What is electric potential? Find electric potential at a point due to a point charge.
(b) How many electrons pass through an electric bulb in one minute if the 300mA current is passing through it?

Question #6
(a) How can you find e/m of an electron? Explain.
(b) A square coil of side 16cm has 200 turns and rotate in uniform magnetic field of magnitude 0.05T. If the peak emf is 12V, what is the angular velocity of the coil?

Question #7
(a) What do you mean by a Hysteresis loop? Explain its salient features.
(b) What is the resonant frequency of a circuit which includes a coil inductance 2.5H and a capacitance of 40μF ?

Question #8
(a) What is an amplifier? Use transistor as an amplifier and find the gain of the amplifier.
(b) A particle of mass 5.0mg moves with speed of 8.0 m/s. Calculate its de-Broghe wave - length.

Question #9
(a) Give three postulates of Bohr's model and calculate the radius of first orbit of hydrogen atom.
(b) A 75kg person receives a whole body radiation dose of 24 mrad delivered by α particles for which RBE factor is 12. Calculate the absorbed energy in Joules.

SECTION-III

 Attempt any TIIREE questions. (5 x 3 = 15)

Question #10
(A) Answer any four parts from the following.

• Why is galvanometer shunted?
• Why the galvanometer shows half deflection upon closing two keys?
• Define volt and ohm.
• Can you use a D.0 voltmeter in A.0 circuit?
• What are the different parts of a transistor?
• What is work function?
• What is OR-gate? Draw its symbol. Also draw truth table.
• Write down truth table of exclusive NOR-gate.

(B) Write down procedure for finding the resistance of a wire using slide wire bridge.

OR

Write down the procedure for studying the variation in electric current with intensity of light using photocell.

(C) Answer the following questions on the basis of graph drawn below.

Graph is plotted between voltage v 1/v and Resistance (ohm) on the back page at No. A

• What do you infer from graph?
• Find the resistance of voltmeter from graph.

Graph is plotted between Q and 1α1/d² cm^-2 on the back page at No.B.

• What do you infer graph?
• Find the slope.