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

1. A. Conduction Band B. Conduction Band
Forbidden Band Valence Band
Valence Band
C. Conduction Band D. Valence Band
Forbidden Band Forbidden Band
Valence Band Conduction Band
FAZAIA SCHOOLS & COLLEGES
SEND-UP EXAM: PHYSICS HSSC-II A2
(Session 2017-18)
Roll No. _______________ Sig. of Invigilator
Name of Candidate
SECTION – A
Time Allowed : 25 Minutes Mark 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.
Q. 1 Circle the correct option i.e. A / B / C / D. Each part carries equal marks.
2 L 2

L

(i) During Forward Bias, the width of the depletion region:
A. Decreases B. Increases
C. Remains Same D. Varies Randomly
(ii) A conductor of length “L” is shown in the figure. How will it affect the resistivity, if the length
is halved?
A. Becomes Double B. Becomes Half
C. Becomes Quadrupled D. Remains
Same
(iii) Which of the following best represents the energy-band diagram for insulators?
(iv) Which of the following substances has not positive temperature coefficient of resistance:
A. Aluminium B. Copper
C. Silver D. Silicon
(v) A rubber balloon is given a positive charge such that at its surface the potential is +5v. What
will be the value of potential at its centre?
A. -5 V B. 0 V
C. +5 V D. 2.5
(vi) The current passing through a choke coil of 5H is decreased at the rate of 2 A/s, the
induced e.m.f in the coil is:
A. -2.5 V B. -10 V
C. 2.5 V D. 10 V
(vii) The piece of wire along which charges are made to accelerate is called:
A.
C.
Transmitting Antenna
L-C Antenna
B.
D.
Receiving Antenna
Receiving Station

2. (viii) In which of the following case, there is no magnetic force on a charged particle q
moving in magnetic field B:
A. B.
B
C. D. q
(ix) Electromagnetic waves do not transport
A. Energy B. Momentum
C. Charge D. Information
(x) If base current is 10µA and collector current is 1mA then current gain of transistor is:
A. 10 B. 100
C. 1/100 D. 1000
(xi) When a motor starts then back e.m.f is:
A. At its peak value B. High
C. Almost zero D. Nil
(xii) Mutual induction play role in
A. Generator B. DC Motor
C. Galvanometer D. Transformer
(xiii) The amount of work done in deformed stretched wire is given by:
A B
C D
(xiv) At which of the following points shown in the figure, the electric field E has maximum value?
A. A B. B
C. C D. All points have same
(xv) If voltage across the live and neutral wires in three phase A.C generator is 230 V then
voltage across two live wires is:
A. 230 V B. 400 V
C 300 V D. 320 V
(xvi) Electrical power is expressed as:
A. V
∆Q
B.
t
∆t W
C. D.
(xvii) Magnetic field B = (4i+18k) Wbm-2 passes through 5km2 area. Net flux through
the area is:
A. 20 Wb B. 90 ×10
−4 Wb
C. 90 Wb D. Zero