BISE Sargodha · Class 12 · Physics · 2025 · Group 1 · Subjective

Electric lines of force never cross. Why?

Do electrons tend to go to region of high potential or of low potential?

Show that $1\frac{\mathrm{v}\mathrm{o}\mathrm{l}\mathrm{t}}{\mathrm{m}\mathrm{e}\mathrm{t}\mathrm{r}\mathrm{e}}=1\frac{\mathrm{n}\mathrm{e}\mathrm{w}\mathrm{t}\mathrm{o}\mathrm{n}}{\mathrm{c}\mathrm{o}\mathrm{u}\mathrm{l}\mathrm{o}\mathrm{m}\mathrm{b}}$

Why Gauss's law is used in electrostatics? How a Gaussion surface is chosen?

How can you use a magnetic field to separate isotopes of chemical element?

Why the voltmeter should have a very high resistance?

Justify that how can we determine position of a charged particle in a uniform electric field.

How the path of circular trajectory of electrons is made visible under magnetic field in a glass tube?

What factors make a fusion reaction difficult to achieve?

Why are heavy nuclei unstable?

How can we classify fundamental particles according to standard model of physics? What is purpose of Higgs Bosons?

How can we control number of neutrons in a nuclear reactor?

Is the filament resistance lower or higher in a $500\mathrm{W}$, $220\mathrm{V}$ light bulb than in a $100\mathrm{W}$, $220\mathrm{V}$ bulb?

What is short-circuit and open circuit mean to you?

Prove that $\mathrm{V}\mathrm{o}\mathrm{l}\mathrm{t}\times \mathrm{A}\mathrm{m}\mathrm{p}\mathrm{e}\mathrm{r}\mathrm{e}=\mathrm{W}\mathrm{a}\mathrm{t}\mathrm{t}$

What is meant by A.M and F.M?

What do you mean by phase Lag and Phase lead?

When $10\mathrm{V}$ are applied to an A.C circuit the current flowing in it is $100\mathrm{m}\mathrm{A}$. Find its impedance?

What is meant by hystersis loss? How is it used in the construction of a transformer?

Energy dissipated per cycle for steel is more as compared to Iron? Why.

Carbon, Silicon and germanium have four valence electrons? Why carbon is insulator while silicon and Germanium are semiconductors?

What is the net charge on a n-type or a p-type substance?

What are sensors? Give two examples?

Write some important uses of Operational amplifier?

Show that $\epsilon$ and $\frac{\mathrm{\Delta }\varphi }{\mathrm{\Delta }t}$ have same unit.

Does the induced emf always act to decrease the magnetic flux through circuit?

Can a step-up transformer increase the Power level?

What are the measurements on which two observers in relative motion will always agree upon?

Which photon, red, green, or blue carries the most energy and momentum?

Which has the lower energy quanta? Radio waves or X-rays?

We do not notice the de-Broglie wavelength for a pitched cricket ball. Explain why?

Is energy conserved when an atom emits a photon of light

What do we mean when we say that the atom is excited?

What is wheatstone bridge discuss its construction and working.

Prove that: $\mathrm{o}\mathrm{h}\mathrm{m}\times \mathrm{F}\mathrm{a}\mathrm{r}\mathrm{a}\mathrm{d}=\mathrm{s}\mathrm{e}\mathrm{c}\mathrm{o}\mathrm{n}\mathrm{d}$

What is mutual induction? Explain the ratio of average emf induced in the secondary to the time rate of change of current in the primary mathematically.

A power line $10.0\mathrm{m}$ high carries a current $200\mathrm{A}$. Find the magnetic field of the wire at the ground.

Describe the behaviour of A.C through a capacitor. Also show that the reactance of capacitor depends upon the frequency of A.C and its capacitance.

Calculate the gain of non-inverting amplifier shown in figure

Explain black body and black body radiation. What facts the energy distribution curves reveal?

A wire $2.5\mathrm{m}$ long and cross section area ${10}^{-5}{\mathrm{m}}^2$ is stretched $1.5\mathrm{m}\mathrm{m}$ by a force of $100\mathrm{N}$ in the elastic region. Calculate the strain and Young's modulus

Define and explain nuclear fission. Describe fission chain reaction.

A tungsten target is struck by electrons that have been accelerated through a potential difference of $3000\mathrm{V}$. If these electrons were slowed down in a target. What will be the minimum wavelength of X-rays produced?