BISE Multan · Class 12 · Physics

BISE Multan · Class 12 · Physics · 2025 · Second Annual · Code 4471

2025 · Second 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: 4471 · Printed marks: 17 · Time: 20 Minutes

PHYSICS PAPER-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 Force between two points charges in the presence of air is $80 N$ . when a dielectric “paraffined paper” of dielectric constant $2$ is placed between them the force reduced to:
- (A)
  $10 N$
- (B)
  $40 N$
- (C)
  $80 N$
- (D)
  $32 N$
2
The electron volt is the unit of:
- (A)
  Electric Potential
- (B)
  Electric Current
- (C)
  Potential Difference
- (D)
  Electric Energy
3
The potential difference between the head and tail of an Electric EEL can be up to:
- (A)
  $600 V$
- (B)
  $500 V$
- (C)
  $200 V$
- (D)
  $1000 V$
4
Two long Parallel wires carrying current ‘ $I_{1}$ ’ and ‘ $I_{2}$ ’ in opposite direction:
- (A)
  Attract each other
- (B)
  Does not effect each other
- (C)
  Repel each other
- (D)
  Proportional to each other
5
The number of electrons in one Coulomb charge is equal to:
- (A)
  $6.25 \times 10^{19}$
- (B)
  $6.25 \times 10^{18}$
- (C)
  $6.25 \times 10^{- 19}$
- (D)
  $6.25 \times 10^{- 18}$
6
A current carrying coil having a $1000$ turns of self inductance $2 H$ and Steady Current $6 A$ passing through in it. What will be the flux through each turn?
- (A)
  $1.8 \times 10^{2} W b$
- (B)
  $1.8 \times 10^{- 2} W b$
- (C)
  $1.2 \times 10^{2} W b$
- (D)
  $1.2 \times 10^{- 2} W b$
7
Due to Polarization, electric field ‘ $E$ ’
- (A)
  Increased
- (B)
  Decreased
- (C)
  First increase than decreased
- (D)
  Remains same
8
The slop of $q - t$ curve at any instant of time when A.C Passes through a Capacitor represents:
- (A)
  Current
- (B)
  Voltage
- (C)
  Inductance
- (D)
  Capacitance
9
What is the Capacitance required to construct a Resonance circuit of frequency $1000 K H z$ with an Inductor of $5 m H$ ?
- (A)
  $6.0 P F$
- (B)
  $7.5 P F$
- (C)
  $5.09 P F$
- (D)
  $8.09 P F$
10
Which of the following is brittle Substance?
- (A)
  Lead
- (B)
  Copper
- (C)
  Wrought Iron
- (D)
  Glass
11
A transistor has a base current of $1 m A$ and emitter current $100 m A$ . The current gain of the transistor is:
- (A)
  $1$
- (B)
  $99$
- (C)
  $100$
- (D)
  $101$
12
A photodiode can turn its current ON and OFF in:
- (A)
  Milli Seconds
- (B)
  Micro Seconds
- (C)
  Nano Seconds
- (D)
  Mega Seconds
13
If temperature is doubled for a black body then energy radiated per second per unit area becomes:
- (A)
  $16$ times
- (B)
  $4$ times
- (C)
  $\frac{1}{16}$ times
- (D)
  $\frac{1}{4}$ times
14
At low temperature a body emits radiation of:
- (A)
  Shorter wavelength
- (B)
  High frequency and Shorter wavelength
- (C)
  High frequency
- (D)
  Longer wavelength
15
$\frac{h}{m_{o} c}$ has the unit of:
- (A)
  Time
- (B)
  Distance
- (C)
  Velocity
- (D)
  Acceleration
16
The binding energy per nucleon is maximum for:
- (A)
  Greatest for heavy nuclei
- (B)
  Least for heavy nuclei
- (C)
  Greatest for light nuclei
- (D)
  Greatest for medium weight nuclei
17
Half life of Radium- $226$ is:
- (A)
  $2.5$ days
- (B)
  $3.8$ days
- (C)
  $1620$ years
- (D)
  $23.5 m i n$

Subjective

Printed marks: 68 · Time: 2.40 Hours

2025 (2nd-A)

INTERMEDIATE PART-II (12th Class)

PHYSICS PAPER-II

SUBJECTIVE

Roll No:

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

SECTION-I

2.

Attempt any eight parts.

8 × 2 = 16

(i)
How can you identify which plate of a capacitor is positively charged?
(ii)
Electric lines of force never cross, why?
(iii)
Define “Capacitive time constant”.
(iv)
Define an “Electron-volt”.
(v)
Why resistance of an ammeter should be very low?
(vi)
Why does the picture on a TV screen become distorted when a magnet is brought near it?
(vii)
Write down two uses of C.R.O.
(viii)
How can you convert a galvanometer into an ammeter?
(ix)
What factors make fusion reaction difficult to achieve?
(x)
What do you mean by “critical mass” in fission chain reaction?
(xi)
What are the isotopes? What do they have in common and what do they have different?
(xii)
Define the term “Nuclear mass defect” how it can be calculated?

3.

Attempt any eight parts.

8 × 2 = 16

(i)
Explain why the terminal potential difference of a battery decreases when the current drawn from it is increased?
(ii)
State Kirchhoff’s $1^{s t}$ and $2^{n d}$ rules.
(iii)
How a zero-ohm resistor is indicated by colour code?
(iv)
What is meant by A.M and F.M?
(v)
How many times per second will an incandescent lamp reach maximum brilliance when connected to a $50 H z$ source?
(vi)
In R-C series circuit if $X_{C} = R$ , then find the angle with which current leads the voltage.
(vii)
What is meant by para and ferromagnetic substances? Give examples for each.
(viii)
What is squid? For what purpose it is used?
(ix)
Differentiate between ductile and brittle substances. Give one example for each.
(x)
Why charge carriers are not present in the depletion region?
(xi)
The inputs of a gate are $1$ and $0$ . Identify the gate if its output is (a) $0$ , (b) $1$ .
(xii)
Write down any two uses of Photodiode.

4.

Attempt any six parts.

6 × 2 = 12

(i)
How can induced current be increased?
(ii)
Does the induced emf always act to decrease the magnetic flux through a circuit?
(iii)
How would you position a flat loop of wire in a changing magnetic field so that there is no emf induced in the loop?
(iv)
Write down applications of photocell.
(v)
Is it possible for an object to move with speed of light? Explain.
(vi)
Which photon, red, green or blue carries the most (a) energy and (b) momentum?
(vii)
Can pair production take place in vacuum? Explain.
(viii)
Can electron reside inside the nucleus? Explain.
(ix)
Can X-rays be reflected, refracted, diffracted and polarized just like any other waves? Explain.

SECTION-II

NOTE: Attempt any three questions.

3 × 8 = 24

5.
(a)
State Gauss’s law. Apply it to determine electric field due to an infinite sheet of charge.
(05)
(b)
Find the current which flows in all the resistances of the circuit given blow:

(03)
6.
(a)
Derive the expression for force on moving electric charge in a uniform magnetic field. Also determine its direction.
(05)
(b)
Two coil are placed side by side. An emf of $0.8 V$ is observed in one coil. When the current is charging at the rate of $200 A s^{- 1}$ in the other coil. What is the mutual inductance of the coil?
(03)
7.
(a)
What is an operational amplifier? Derive the relation of gain of the op-amp as non-inverting amplifier.
(05)
(b)
An inductor of inductance $150 μ H$ is connected in parallel with a variable capacitor whose capacitance can be changed from $500 p F$ to $20 p F$ . Calculate the maximum frequency and minimum frequency for which the circuit can be tuned.
(03)
8.
(a)
State and explain the Photoelectric effect. Write down its experimental results and failure of classical theory.
(05)
(b)
A $1.0 m$ long copper wire is subjected to stretching force and its length increases by $20 c m$ . Calculate the tensile strain and the percent elongation which the wire undergoes.
(03)
9.
(a)
What is radioactivity? Explain the nuclear transmutation rules for emission of $α$ , $β$ & $γ$ -rays.
(05)
(b)
Calculate the longest wavelength radiation of the Paschen series.
(03)
19-2025(2nd-A)- (MULTAN)

Original source references (5)

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

Objective · 4471 · Printed marks: 17 · Time: 20 Minutes
Objective · 4473 · Printed marks: 17 · Time: 20 Minutes : same questions, source numbering preserved separately
Objective · 4475 · Printed marks: 17 · Time: 20 Minutes : same questions, source numbering preserved separately
Objective · 4477 · Printed marks: 17 · Time: 20 Minutes : same questions, source numbering preserved separately
Subjective · psp_b26219771605c4241c051e7266477569 · Printed marks: 68 · Time: 2.40 Hours