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11th English Lahore Board Subjective Paper Group 1|

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12th physics most important short questions and long questions guess 2026

12th physics most repeated MCQ past papers Guess 2026

*Physics 12th 2026*
*Important Long Questions & Numericals*

1️⃣ What is electric field? Find the electric field intensity due to an infinite sheet of charge.
2️⃣ Find electric potential at a point due to a point charge.
3️⃣ Write a note on Wheatstone bridge.
4️⃣ Define electric power. Derive an expression for the power dissipated in a resistor.
5️⃣ What is voltmeter? How galvanometer is converted into voltmeter?
6️⃣ A power line 100 m high carries a current of 200 A. Find the magnetic field of the wire at the ground.
7️⃣ A solenoid 15.0 cm long has 300 turns of wire. A current of 5.0 A flows through it. What is the magnitude of magnetic field inside the solenoid?
8️⃣ Describe the principle, construction and working of a galvanometer.
9️⃣ An ideal stepdown transformer is connected to main supply of 240 V. It is desired to operate a 12 V, 30 watt lamp. Find the current in the primary and transformational ratio.
🔟 Describe the principle, construction and working of a D.C generator.
1️⃣1️⃣ A solenoid has 250 turns and its self inductance is 204 mH. What is the flux through each turn when the current is 2 A? What is the induced emf when current changes at 20 A/s?
1️⃣2️⃣ Derive an expression for the energy stored in an inductor and also for the energy density.
1️⃣3️⃣ Find the value of the current flowing through a capacitance 0.5 μF when connected to a source of 150 V at 50 Hz.
1️⃣4️⃣ Describe A.C through an inductor.
1️⃣5️⃣ Describe series and parallel resonance circuits.
1️⃣6️⃣ A 1.0 m copper wire is subjected to a stretching force and its length increases by 20 cm. Calculate the tensile strain and the percent elongation which the wire undergoes.
1️⃣7️⃣ Explain the magnetic properties of solids.
1️⃣8️⃣ Explain the mechanical properties of solids.
1️⃣9️⃣ What are semiconductors? Discuss the formation of P-type and N-type materials with a diagram.
2️⃣0️⃣ What is operational amplifier? Discuss operational amplifier as inverting amplifier. Calculate its gain.
2️⃣1️⃣ Calculate the gain of an amplifier in which collector resistance RC is 5 kΩ. The input resistance between the base and emitter of a typical resistor is 2.5 kΩ and value of its β = 100.
2️⃣2️⃣ Discuss the structure and working of electron microscope.
2️⃣3️⃣ Write a note on photoelectric effect.
2️⃣4️⃣ What is the mass of a 70 kg man in a space rocket travelling at 0.8C from us as measured from the earth?
2️⃣5️⃣ An electron is accelerated through a potential difference of 50 V. Calculate de Broglie wavelength.
2️⃣6️⃣ What are the energies in eV of quanta of wavelength: λ = 400, 500, 700 nm?
2️⃣7️⃣ Describe Bohr’s postulates of hydrogen atom.
2️⃣8️⃣ Give the uses of laser in medicine and industry.
2️⃣9️⃣ Explain the working principle of laser.
3️⃣0️⃣ Define isotopes and describe mass spectrograph to separate different isotopes of an element.
3️⃣1️⃣ Radiations from a point obey the inverse square law. If the count rate at a distance of 1.0 m from Geiger counter is 360 counts per minute, what will be its count rate at 3.0 m from the source?
3️⃣2️⃣ Describe Wilson cloud chamber to detect radiation.

*📢 2nd Year Urdu Important Topics 2026|*

🔴 اہم مضامین

🔘 تعلیم نسواں
🔘 دہشت گردی
🔘 حب الوطنی
🔘 تعمیر وطن میں طلباء کا کردار
🔘 میرا پسندیدہ شاعر
🔘 ماحولیاتی آلودگی
🔘 شجر کاری کی ضرورت و اہمیت
🔘 موبائل / سوشل میڈیا کا استعمال
🔘 بے روزگاری
🔘 قدرتی وسائل کا تحفظ
🔘 اسلامی اخوت

🔴 اہم خلاصہ جات

🔘 محنت پسند خردمند
🔘 پہلی فتح
🔘 مولانا ظفر علی خان
🔘 عمر بن عبدالعزیز
🔘 نواب محسن الملک

🔴 اہم سیاق و سباق

🔘 عمر بن عبدالعزیز
🔘 دستک
🔘 تشکیل پاکستان
🔘 اکبری کی حماقتیں
🔘 پہلی فتح
🔘 محنت پسند خردمند
🔘 نواب محسن الملک

*📢 BWP Board 12th Class Biology Subjective Group 1 |

*📢 SRG Board 12th Class Math Subjective Group 1 |

*📢 RWP Board 12th Class Math Subjective Group 1 |