Physics(New Scheme)
Gujranwala Board 2015
Inter Part II
Time: 20 Minute
Paper Objective Type
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 circle. 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 product of resistance and capacitance is:

(a) Velocity
(b) Force
(c) Acceleration
(d) Time

• Electricity intensity inside the hollow sphere is:

(a) σ/ε_o
(b) σ/2ε_o
(c) 1/ ε_o
(d) zero

• One Ohm is equal to:

(a) VC^-1
(b) CV^-1
(c) AC^-1
(d) VA^-1

• The e/m of a neutron is:

(a) Less than electron
(b) Greater than electron
(c) Zero
(d) The same as electron

• Torque on a current carrying coil is given by:

(a) ILB cos α
(b) ILB sin α
(c) IBA cos α
(d) IBA sin α

• The self –induction is given by:

(a) NL=ФI
(b) NI=LФ
(c ) NФ=LI
(d) N=LI

• Which one is not present in A.C generator?

(a) Armature
(b) magnet
(c ) Slip rings
(d) Commutator

• Direct current cannot flow through:

(a) Indicator
(b) resistor
(c ) transistor
(d) capacitor

• The peak value of A.C source is 20 A, and then its rms value will be:

(a) 14.1 A
(b) 10A
(c ) 20 A
(d) 28.2 A

• The Young’s modulus of steel is:

(a) 20 x 10¹¹ Nm^-2
(b) 3.9 x 10^-9Nm^-2
(c ) 2 x 10⁹ Nm^-2
(d) 1.5 x 10⁹Nm^-2

• Which one is pentavlent impurity?

(a) Boron
(b) gallium
(c ) antimony
(d) energy

• In photovoltaic cell, current is directly proportional to:

(a) wavelength of light
(b) intensity of light
(c ) frequency of light
(d) energy

• The momentum of photon is given by the equation:

(a) P=mv
(b) P=h/λ
(c ) P= λ/h
(d) P=h λ

• Energy of each positron is given by:

(a) 2MeV
(b) 1.02MeV
(c ) 0.51 MeV
(d) 5 MeV

• The equation of Rydberg constant is given by:

(a) R_H=ho/m_o
(b) R_H=Eo/hc
(c ) R_H=Eo/ λ
(d) R_H=1/he

• α – particle carries a change:

(a) –e
(b) +2e
(c ) -2e
(d) no change

• A proton consist of quarks which are:

(a) two up, one down
(b) one up, two down
(c ) all up
(d) all down

Physics(New Scheme)
Gujranwala Board 2015
Inter Part II
Time: 3:10 Hours
Paper Subjective Type
Max. Marks:83
Note: Section I is compulsory. Attempt ant three (3) questions from Section II and any three (3) parts Section-I from Section III.

Q2. Write short answers to any EIGHT questions: (2x8=16)

• Define electric force and electrostatics.
• Do electrons tend to go to region of high potential or of low potential?
• Electric lines of force never cross another. Why?
• Convert 1joule into electron-volt.
• What is cathode ray oscilloscope and galvanometer?
• Why does the picture on a T.V screen become distorted when a magnet is brought near the screen?
• Name the main parts of C.R.O.
• What is the Lorentz force?
• Define induced current and induced emf.
• Name the factors upon which the self-inductance depends.
• Show ԑ and ΔФ/Δt have the same units.
• What are the difference between motor and generator?

Q3: Write short answers to any EIGHT questions: (2x8=16)

• Define conventional current and electronic current.
• Why does the resistance of a conductor rise with temperature?
• Define Ohm’s Law. Also define ohmic and non-ohmic devices.
• Define reactance of an inductor and write its formula.
• In a R-L circuit, will the current leg or lead the voltage? Illustrate your answer by vector diagram.
• What is meant by A.M and F.M?
• Define ultimate tensile strength (UTS) and fracture stress.
• Define stress and strain. What are their S.I units?
• What is meant by hysteresis loss? How is it used in the construction of a transformer?
• What is net change on N-type and P-type substances?
• Why is base current in a transistor very small?
• Write down symbols and truth table of exclusive NOR gate.

Q4: Write short answers to any SIX questions: (2x6=12)

• Write down the postulates of special theory of relativity.
• Why don’t we observe a Compton effect with visible light?
• Which has the lower energy quanta? Radio waves or X-rays.
• What is meant by stimulated emissions?
• What are the advantages of lasers over ordinary light?
• What do you understand by background radiation?
• What is radioactive tracer? Describe one application in medicine.
• How can radioactivity help in the treatment of cancer?
• Write the names of basic forces of nature.

(SECTION-II)

Q5: (a) what is Gauss’s law? Derive the relation for electric intensity due to an infinite sheet of change. (5)

(b) The potential difference between the terminals of a battery in open circuit is 2.2V when it is connected across the resistance of 5Ω. The potential falls to 1.8V. Calculate the current and the internal resistance of the battery. (3)

Q6. (a) Derive an expression for the energy stored in an inductor. Also define energy density. (5)

(b) A power line 10.0 m high carrier a current 200 A. Find the magnetic field of the wire at the ground. (3)

Q7: (a) Explain “Energy Theory”. On the basic of this theory. Categorize the kinds of solids. (5)

(b) A 10 mH, 20 Ω coil is connected across 240 V and 180/π Hz source. How much power does it dissipate? (3)

Q8: (a) Write a note on Compton Effect. (5)

(b) The current following into the base of a transistor is 100μA. Finds its collector current I_c, emitter current I_E and the ratio I_C/I_E, if the value of current gain β is 100. (3)

Q9. (a) Explain how we can separate the isotopes of an element with the help of mass spectrograph. 5

(b) Compute shortest wavelength radiation in Blamer. What value of n must be used? 3

(SECTION-III Practical)

Q10: Give answer of any FOUR questions. (2x4=8)

• Define specific resistance and give its SI unit.
• What is voltmeter? How can’t it be connected in circuit to measure potential?
  
• Define potential difference and write its equation.
• State Ohm;s Law and give its equation.
• Write truth table and symbol for OR gate.
• Define threshold frequency and work function.
• Define capacitance of a capacitor.
• What is shunt?

Write down the procedure for determining the internal resistance of a cell using potentiometer. (3)

OR

Write down the procedure for determining the internal resistance of a cell using potentiometer.

(c ) Answers the questions given below on the basic of the following graph: (4)

1. What do you infer from the graph?
2. Find the slope of graph.

OR

Answer questions given below on the basic of the following graph: (4)

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

Image Graph 1
Image Graph 2