BISE Multan · Class 11 · Physics · 2025 · Second Annual · Code 2471

The product of SI units of pressure and volume is:

The example of irreversible process is:

In multimode step index fibre, the diameter of core is _____.

In Michelson’s interferometer, to switch bright fringe to dark fringe, movable mirror should be displaced:

Wavelength of a wave for pipe closed at one end in fundamental mode is:

When transverse wave travelling in rare medium is incident on denser medium, then after reflection phase changes by:

The motion of simple pendulum is S.H.M only if:

Venturi-meter is a device used to measure:

Close orbiting satellite takes time to complete one revolution around the earth:

The rotational K.E of solid sphere is:

The escape velocity at the surface of moon is:

Horizontal acceleration of projectile is:

Velocity of an object dropped from a height at any time "$t$" is:

Magnitude of $\vec{A}=\widehat{i}+\widehat{j}+\widehat{k}$ is:

If $\vec{B}=14\widehat{j}$, then $\vec{B}$ makes angle with $x$-axis:

The ratio of micro to tera is:

Absolute uncertainty in a measuring instrument is equal to:

What is the systematic error? How it can be minimized?

Differentiate between precision and accuracy.

Show that $E=m{c}^2$ is dimensionally consistent.

Why do we find it useful to have two units for the amount of substance, kilogram and mole?

Define position vector and write equations for a three dimensional vector and its magnitude.

Name the three conditions that could make ${\vec{A}}_1\times {\vec{A}}_2=0$

Two vectors have unequal magnitudes. Can their sum be zero?

Derive an equation which can determine the half of the time of projectile motion.

How would you elaborate Ballistic missiles as the application of projectile motion?

Define impulse and show that how it is related to linear momentum.

Derive a relation for work-energy principle.

Calculate the work done in kilojoules in lifting a mass of $10\mathrm{k}\mathrm{g}$ through a vertical height of $10\mathrm{m}$.

Describe what should be the minimum velocity for a satellite to orbit close to the Earth around it.

State the direction of the following vectors in simple situations; angular momentum and angular velocity.

Show that $\vec{a}=\vec{\alpha }\times \vec{r}$

What is the Einstein’s view of gravitation?

What is drag force? What will be the effect of drag force acting upon a small sphere of radius $r$, moving down through a liquid?

In an orbiting space station, would the blood pressure in major arteries in the leg ever be greater than the blood pressure in major arteries in the neck.

Can we realize an ideal simple pendulum?

Under what conditions does the addition of two simple harmonic motions produce a resultant, which is also simple harmonic?

State Hooke’s law. Write its mathematical form.

A wave is produced along a stretched string but some of its particles permanently show zero displacement. What type of wave is it?

Explain why does sound travel faster in warm air than in cold air?

In case of Doppler’s effect, define the blue shift and red shift.

Write two conditions in order to observe interference pattern.

How is the distance between interference fringes affected by the separation between the slits of Young’s experiment? Can fringes disappear?

Could you obtain Newton’s rings with transmitted light? If yes, would the pattern be different from that obtained with reflected light?

Find magnifying power of a convex lens with $f=5\mathrm{c}\mathrm{m}$, when image is formed at least distance of distinct vision.

Define total internal reflection and critical angle.

Why is the single mode fibre preferred in telecommunications?

If $P=\frac{1}{3}\rho ⟨v^2⟩$, prove that $P\propto ⟨K\mathrm{.}E⟩$, if molecular density is constant.

What happens to the temperature of the room, when an airconditioner is left running on a table in the middle of the room?

Does entropy of a system increase or decrease due to friction?

Explain the addition of $n$ coplanar vectors by rectangular components method.

A truck weighing $2500\mathrm{k}\mathrm{g}$ and moving with a velocity of $21\mathrm{m}{\mathrm{s}}^{-1}$ collides with a stationary car weighing $1000\mathrm{k}\mathrm{g}$. The truck and the car move together after the impact, calculate their common velocity.

Why geostationary orbits are important? Derive relation and find radius of the geostationary orbit.

A man pushes a lawn mower with a $40\mathrm{N}$ force directed at an angle of ${20}^{\circ }$ downward from the horizontal. Find the work done by the man as he cuts a strip of grass $20\mathrm{m}$ long.

Define terminal velocity. Show that terminal velocity is directly proportional to the square of radius.

Calculate the entropy change when $1.0\mathrm{k}\mathrm{g}$ ice at $0^{\circ }\mathrm{C}$ melts into water at $0^{\circ }\mathrm{C}$. Latent heat of fusion of ice $L_f=3.36\times {10}^5\mathrm{J}\mathrm{k}{\mathrm{g}}^{-1}$

What is simple pendulum? Show that its time period does not depends upon the mass of bob.

Find the temperature at which the velocity of sound in air is two times its velocity at ${10}^{\circ }\mathrm{C}$.

How diffraction of $X$-rays is studied by crystals and derive Bragg’s equation.

A glass light pipe in air will totally internally reflect a light ray if its angle of incidence is at least ${39}^{\circ }$. What is the minimum angle for total internal reflection if pipe is in water? (Refractive index of water $=1.33$)