## Physics Long Questions Guess Paper 11th Class 2017

**Note: **(Chemistry Guess Papers 2017 11th Class) All published material contains an informatory data which is only gathered for educational purpose. These guesses are prepared after detailed analysis of past five years exams. Our entire team and/or publishers are not responsible in case of variation in assumed results and outcomes. However the purposes of attempted efforts are to provide accurate and effective knowledge to the readers, in any case our entire team and/or publishers will not be responsible for the accuracy or misusage of all published material.

# موسٹ امپورٹنٹ سوالات کے لیا سائٹ پیپر سے کچھ دن پھیلے بی چیک کریں: شکریہ

یہ پیپر اولڈ اور نیو کورس کا تجزیہ کر کے تیار کیا گیا ہے (٢٠١٢ سے ٢٠١۶ اولڈ پپیرس ). اپپنے سلیبس کے مطابق تیاری کریں شکریہ.

## Frequently Asked Questions (2012 to 2016)

**Physics Long Questions Variations**

Explain the construction and working of spectrometer? Write down its uses.

Explain the Hook’s Law.

Define impulse and show its relation to linear momentum. OR Explain the law of conservation of angular momentum and give its application. OR State and explain the law of conservation of momentum. OR What is the law of conversation of energy? How is it verified in mass spring system?

Explain the reflection of waves from a denser and rare medium?

Find the pressure caused by the gas molecules on the walls of the container. OR Estimate the average speed of nitrogen molecules in air under standard conditions of pressure and temperature. OR Find the average speed of oxygen molecule in the air at S.T.P.

How many orders of spectra can be observed on either side of the direct beam?

What should be the minimum number of geostationary satellites, required to give full global coverage of T.V transmission. OR What are geostationary satellites? Calculate the radius of geostationary orbit. OR In an orbiting space-station, would the blood pressure in major arteries of the legs be greater than the blood pressure in the major arteries of neck.

Derive an expression for K.E. and P.E. of the mass spring system executing S.H.M. Also proved its total energy remains conserved. OR Define absolute potential of kinetic theory of gases. OR Write down the different types of energy. OR Describe work energy principle. OR State rotational kinetic energy. Derive the expression of rotational kinetic energy of the disc and a hoop. Why does a disc move faster than a hoop on an inclined plane? OR Write five postulated of Kinetic Molecular theory. Also prove that pressure exerted by the gas is directly proportional to the average transnational kinetic energy of the gas molecules.

Define absolute potential energy. Derive its mathematical expression. OR Define absolute potential energy (PE). Drive an equation (at an angle of 20°) downward frame the absolute P.E. of a body at the earth surface.

Derive and explain Bernoulli’s Equation. OR State and derive Bernoulli’s equation for ideal fluid. OR State and prove the Bernoulli’s equation in dynamic fluid, that relates pressure to fluid speed and height.

Describe the construction of compound microscope and derive an expression for its Magnifying power OR Define and explain simple microscope. OR Define microscope. Derive relation for magnifying power of compound microscope.

Describe the phenomenon of beats. What are the uses of beats?

Determine the angle corresponding to each other. OR Find the angle of projection of a projection of a projectile for which its maximum height and horizontal range are equal. OR What is the projectile motion? Derive the relation for (i) Time of flight. (ii) Maximum height for projectile.

Explain least distance of distant vision or near point.

What are the applications of Doppler’s effect?

What are the defects in Newton’s Formula for speed of sound? How this formula was connected by Laplace? OR What is drawback of Newton’s formula for speed if sound in air? How Laplace corrected it? OR State and explain Newton’s Laws of motion. OR What are the views of Newton’s and Einstein’s about gravitation?

Define and explain interference of sound waves. What are its kinds & conditions? OR Explain Young’s double slit experiment and show that the bright and dark fringes are of equal with and are equally spaced. OR In a double slit experiment, the second order maximum occurs at 0 = 0.25°. The wavelength is 650 nm. Determine the slit separation. OR During Young’s double slit experiment, explain how the interfringes distance also depend open the wavelength of the light used

Define elastic and inelastic collision. Explain elastic collision in one dimension to show the relative velocities before and after collision are same

What are the molar specific heats if a gas? Prove that molar specific heat of a gas at constant pressure is greater than molar specific heat at constant volume

What is simple pendulum? Show that motion of simple pendulum is simple harmonic motion. Also derive the relation for its time period. OR What is simple pendulum? Show that its motion is S.H.M. Derive expression for its time period.

Explain the colors spectrum on an oil film spreading over a wet footpath.

Explain diffraction of X-rays by crystals.

Define projectile motion? Find the horizontal and vertical components of distance. OR Define simple harmonic motion. Prove that projection of particle moving in a circle along vertical diameter is a SHM. OR What us simple harmonic motion? Show that the total energy of the vibrating mass spring system is constant. OR Show that the motion of projection of a body moving in a circle with constant speed is simple harmonic motion.

Explain orbital velocity? Derive an expression for orbital veil Sty. OR Define terminal velocity, show that terminal velocity is directly proportional to the square of radius of the droplet. OR Define terminal velocity. Show that terminal velocity is directly proportional to the square of radius. OR Explain power and velocity. OR Find the temperature at which the velocity of sound in air two times. Its velocity at 10°C.

Explain the addition of vectors by rectangular components method. OR Define cross product of two vectors. Explain it with any two examples. Also write the characteristics of cross product. OR Define scalar product of two vectors and give its four characteristics. OR Describe the important characteristics of scalar product. OR Can a vector have a component greater than vector’s magnitude? OR Find the angle between two forces of equal magnitude when the magnitude of their resultant is also equal to the magnitude of either of these forces. OR Define rectangular components of a vector. How two vectors can be added by rectangular component methods?

A 1000 kg car traveling with a speed of 144 km round a curve of radius 100 m. Find necessary centripetal force.

An astronomical telescope having magnifying power of 5 consist of two thin lenses 24 cm apart. Find the focal lengths of the lenses.

The frequency of note emitted by a stretched string is 300 Hz. What will be frequency of this note when the tension is increased by one-third without changing the length of the wire?

Derive the relation (i) acceleration. (ii) instantaneous velocity, for the projection of a particle moving around a circle.

A force (thrust) of 400 N is required to overcome road friction and air resistance in propelling an automobile at 80 km / hr. What power (kw) must the engine develop?

Explain heat death of universe.

Explain the working of optical fiber communication system.

Prove that during one dimension elastic motion relative speed of approach is equal to the relative speed of separation.

Explain turning effect of a body of mass m. OR Evaluate the force needed to bend the normally straight path of the particle of mass m into a circular path.

Using the equation of efficiency of an engine, explain that increase in the efficiency depends upon the temperature of hot reservoirs.

Explain iso thermal process and adiabatic process.

Define and explain the term Torque. Discuss torque in case if rigid body. OR Define torque. Explain the idea of torque due to force F acting on a rigid body.

State and explain Torricelli’s theorem.

Explain traveling wave with the help of its kinds.

Define equilibrium? OR State and explain the first and second condition of equilibrium.

Define gravitational field. Prove that work done in the earth’s gravitational field is independent of path followed. OR Prove that work done by gravitational field is independent of the path followed. And what you conclude from this? OR What is conservative field? Show that a gravitational field is a conservative field. OR What is meant by centripetal force and centripetal acceleration and derive the relations between them. OR What is centripetal force? Derive relation for it in terms of angular velocity. OR Define centripetal force. Derive a relation for centripetal force.

Define the principle and working of Michelson’s interference? OR Describe the Michelson’s experiment for calculation of speed of light.

What do you niacin by interpretation of temperature?

What is diffraction of light? How does diffraction differ from interference?

What is Doppler Effect? Find the apparent change in frequency when source is at rest and observer is moving.

What is the effect of mass of the rocket on the acceleration?