fazaia inter college lahore Send up examination class xi and xii 2017-18

1. Roll No.
FAZAIA SCHOOLS & COLLEGES
SEND-UP EXAM: PHYSICS HSSC-I
(Session 2017-18)
Name of Candidate
Time Allowed : 2: 35 Hours Total Marks: 68
NOTE: Sections B, C and D comprise pages 1-2 and questions therein are to be answered on the separately provided
Answer Book. Answer any 07 parts each from section B and section C and any two questions from section D.
Use supplementary answer sheet i.e. Sheet – B if required. Write your answers neatly and legibly.
SECTION – B
Q. 2 Attempt any SEVEN parts. All parts carry equal marks. (7 X 3= 21)
(i) What is the net force acting on a charge particle moving in a region of electric field E and magnetic field B? What
is the name of this force?
(ii) The potential is constant throughout a given region of space. Is electric field zero or non-zero in this region?
(iii) Why terminal potential difference of a battery decreases when current drawn from it is increased?
(iv) A platinum wire has resistance of 10ῼ at 0⁰C and 20ῼ at 273⁰C. Find value of temperature coefficient of
resistance of platinum.
(v) Find heat dissipated through a bulb of 200W in 2 hours.
(vi)
What is current sensitivity of a suspended moving coil galvanometer? How does it depend upon different factors?
Describe by mathematical formula.
(vii)
Show that ‘ε’ and ∆φ /
∆t
have same units.
(viii) A power line 10m high carries a current 200A. Find magnetic field of wire at ground.
(ix) In a transformer, there is no transfer of charge from primary to secondary coil. How is then power
transferred? (x) Distinguish between flux and flux density. How they are related?
SECTION – C
Note: Attempt any SEVEN parts. All parts carry equal marks. (7 X 3= 21)
Q. 3
(i)
(ii)
(iii)
Show graphically the phase relationship between current and voltage across an
inductor. What is meant by A.M and F.M? And why quality transmission of FM is better
than AM?
through an inductor of 10H.
(iv) What are brittle and ductile substances? Give examples of each.
(v) What is meant by hysteresis loss? How is it used in construction of a transformer?
(vi) A 1.25cm diameter cylinder is subjected to a load of 2500kg. Calculate the stress on bar in mega pascal.
(vii) Define the term hole, and how its different from positively charge proton.
(viii) Why charge carriers are not present in depletion region?

2. (ix) Cite the major difference between forward and reverse biased p-n junction diode.
(x) Cite the difference between low temperature and high temperature super conductor.

3. SECTION – D
Note: Attempt any TWO questions. All questions carry equal marks (2X13= 26)
Q. 4 a. What is electric potential? Derive an expression of electric potential at a point due to point charge. 6
b.
Two point charges q₁=-1µC and q₂=+4µC are separated by a distance of 3m. Find and justify zero
4
c. How rheostat is used as a variable resistor?
3
Q.5
a. Derive an expression for the force on a charged particle moving in a magnetic field. Also
explain direction of force on an electron and proton.
6
b. Prove that: L=µ˳n²Al 4
c. Write a short note on three phase A.C supply.
3
Q.6
a. What is transistor? Derive an expression of gain when transistor is used as an amplifier.
7
b. What is meant by para-, dia-, ferromagnetic substances? Give example for each case.
3
c. When 10 V are applied to on A.C , Circuit, the current flowing in it is 100 mA. Find its impedance.
3