BISE Multan · Class 12 · Physics

BISE Multan · Class 12 · Physics · 2026 · First Annual · Group 2

2026 · First Annual

Transcribed from the identified examination paper. Check the board, session and course before use. SchoolOrbit is not affiliated with the issuing board.

Objective

Source code: 4472 · Printed marks: 17 · Time: 20 Minutes

PHYSICS PAPER-II GROUP-II

OBJECTIVE

Q.No.1

You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.

1
The relative permittivity of free space has the value equal to:
- (A)
  $2.1$
- (B)
  $1.006$
- (C)
  $78.5$
- (D)
  $1.0$
2
A uniform electric field is represented by a set of lines which are:
- (A)
  Parallel and equally spaced
- (B)
  Converging
- (C)
  Diverging
- (D)
  Circular
3
Wheatstone Bridge is used to measure the:
- (A)
  Current
- (B)
  Voltage
- (C)
  Resistance
- (D)
  Capacitance
4
A high speed graph plotting device is:
- (A)
  Galvanometer
- (B)
  CRO
- (C)
  Voltmeter
- (D)
  Printer
5
A commercial instrument for measuring current, voltage and resistance is known as:
- (A)
  Voltmeter
- (B)
  Ammeter
- (C)
  AVO meter
- (D)
  Galvanometer
6
Self induced ' $e m f$ ' is also called:
- (A)
  Motional $e m f$
- (B)
  Thermistor
- (C)
  Electrostatic induction
- (D)
  Back $e m f$
7
The brushes used in a generator are made up of:
- (A)
  Graphite or Carbon
- (B)
  Iron or Nickel
- (C)
  Copper or Iron
- (D)
  Steel or Copper
8
The opposition offered by a capacitor to the flow of an A.C is called:
- (A)
  Capacitance
- (B)
  Resistance
- (C)
  Capacitive reactance
- (D)
  Inductance $L$
9
When $X_{L} = X_{C}$ , this condition is called:
- (A)
  Null
- (B)
  Resonance
- (C)
  Balanced
- (D)
  Absolute
10
The ratio of stress to volumetric strain is called:
- (A)
  Shear Modulus
- (B)
  Young’s Modulus
- (C)
  Bulk Modulus
- (D)
  Modulus of elasticity
11
The potential barrier for silicon at room temperature is:
- (A)
  $0.3 V$
- (B)
  $1.0 V$
- (C)
  $0.5 V$
- (D)
  $0.7 V$
12
Current gain of a transistor is:
- (A)
  $\frac{I_{B}}{I_{C}}$
- (B)
  $\frac{I_{C}}{I_{B}}$
- (C)
  $β = I_{B} - I_{C}$
- (D)
  $β = I_{B} + I_{C}$
13
Which one of the given radiations has the most energetic photon?
- (A)
  T.V waves
- (B)
  Micro-waves
- (C)
  X-rays
- (D)
  $γ$ -rays
14
A device based on photo-electric effect is called:
- (A)
  Photo sensitive
- (B)
  Photo diode
- (C)
  Photo-cell
- (D)
  Photosynthesis
15
According to de-Broglie, the electrons in the Bohr Orbits may appear as:
- (A)
  Standing waves
- (B)
  Particle
- (C)
  Photon
- (D)
  Ion
16
A place where controlled fission chain reaction is carried is called:
- (A)
  A black hole
- (B)
  Atomic bomb
- (C)
  Mass-spectrograph
- (D)
  A reactor
17
$β$ -particle is regarded as fast moving:
- (A)
  Proton
- (B)
  Electron
- (C)
  Neutron
- (D)
  Boson

Subjective

Printed marks: 68 · Time: 2.40 Hours

INTERMEDIATE PART-II (12th Class)

PHYSICS PAPER-II GROUP-II

SUBJECTIVE

NOTE: Write same question number and its parts number on answer book, as given in the question paper.

SECTION-I

2.

Write answers of any eight parts.

8×2=16

(i)
Show that $R C = t$
(ii)
What is the electric intensity at a distance ' $r$ ' $100 c m$ due to charge $10 μ C$ ?
(iii)
Electric field lines of force never cross. Why?
(iv)
If a point charge ' $q$ ' of mass ' $m$ ' is released in a non-uniform electric field with field lines pointing in the same direction, will it make rectilinear motion?
(v)
What is Dead Beat Galvanometer?
(vi)
What is Lorentz force?
(vii)
How can a current loop be used to determine the presence of a magnetic field in a given region of space?
(viii)
Suppose that a charge ' $q$ ' is moving in a uniform magnetic field with a velocity ' $v$ '. Why is there no work done by the magnetic force that acts on the charge ' $q$ '?
(ix)
What are the basic forces of nature?
(x)
What do you know about radiography?
(xi)
Differentiate between thermal and fast reactors.
(xii)
Which radiation does would deposit more energy in the body (a) $10 m G y$ to the hand, or (b) $1 m G y$ does to entire body.

3.

Write answers of any eight parts.

8×2=16

(i)
Is the filament resistance lower or higher in a $500 W$ , $220 V$ light bulb than in a $100 W$ , $220 V$ bulb?
(ii)
Describe a circuit which will give a continuously varying potential.
(iii)
What is Conventional Current?
(iv)
How does doubling the frequency affect the reactance of a capacitor?
(v)
In a $R - L$ circuit, will the current lag or lead the voltage? Illustrate your answer by a vector diagram.
(vi)
Differentiate between peak value and rms value of sinusoidal AC.
(vii)
Describe the formation of energy bands in solids.
(viii)
What is meant by doping? Explain its impact on the conductivity of a semi-conductor?
(ix)
Distinguish between amorphous and polymeric solids.
(x)
The anode of a diode is $0.2 V$ positive with respect to its cathode. Is it forward biased? Explain.
(xi)
Write down the Boolean expression of XNOR gate. Also draw its schematic diagram.
(xii)
Why is the base current in a transistor very small?

4.

Write answers of any six parts.

6×2=12

(i)
State Faraday’s Law. Also write its formula.
(ii)
What are eddy currents in a transformer?
(iii)
Show that $E$ and $\frac{Δ ϕ}{Δ t}$ have the same units.
(iv)
Distinguish between inertial and non-inertial frame of reference.
(v)
What are the measurements on which two observers in relative motion will always agree upon?
(vi)
Photon A has twice the energy of photon B. What is the ratio of momentum of A to that of B?
(vii)
What advantages an electron microscope has over an optical microscope?
(viii)
Explain why laser action cannot occur without population inversion between atomic levels?
(ix)
How do we obtain the image of bones using X-rays?

SECTION-II

NOTE: Attempt any three questions.

3×8=24

5.
(a)
State Gauss’s law. Apply it to find the electric intensity between two oppositely charged parallel plates.
(05)
(b)
$0.75 A$ current flows through an iron wire when a battery of $1.5 V$ is connected across its ends. The length of the wire is $5.0 m$ and its cross sectional area is $2.5 \times 10^{- 7} m^{2}$ . Compute the resistivity of iron.
(03)
6.
(a)
Discuss the principle, construction and working of galvanometer. (upto $I \propto θ$ )
(05)
(b)
An ideal step down transformer is connected to main supply of $240 V$ . It is desired to operate a $12 V$ , $30 W$ lamp. Find the current in the primary and transformation ratio.
(03)
7.
(a)
What is comparator? How the comparator can be used as night switch?
(05)
(b)
What is the resonant frequency of a circuit which includes a coil of inductance $2.5 H$ and a capacitance of $40 μ F$ ?
(03)
8.
(a)
Write the postulates of special theory of relativity and explain the phenomenon of time dilation and length contraction.
(05)
(b)
A wire $2.5 m$ long and cross-section area $10^{- 5} m^{2}$ is stretched $1.5 m m$ by a force of $100 N$ in the elastic region. Calculate (i) the strain (ii) Young’s modulus
(03)
9.
(a)
Explain construction, working and uses of Geiger-Muller Counter in detail.
(05)
(b)
Electrons in an X-ray tube are accelerated through a potential difference of $3000 V$ . If these electrons were slowed down in a target, what will be the minimum wavelength of X-rays produced?
(03)

Original source references (3)

The original files and numbering are retained. Equivalent files do not repeat the questions above.

Objective · 4472 · Printed marks: 17 · Time: 20 Minutes
Objective · 4476 · Printed marks: 17 · Time: 20 Minutes : same questions, source numbering preserved separately
Subjective · psp_225db17622a11791a2394c8023ee4da9 · Printed marks: 68 · Time: 2.40 Hours