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  • Important questions of physics (Term-2)

    Important questions of class 11th [physics (Term-2)]

    This assignment contain the questions of following chapters [ 1- Solids ( elasticity), 2- Fluids , 3- Thermal properties of matter, 4- Thermodynamics,5-Oscillations ,6-Waves ]

    1 .What are the basic assumptions of kinetic theory of gases? on their basis, derive an expression for the pressure exerted by an ideal gas.

    2. What is meant by degrees of freedom? State the law of equipartition of energy. Hence calculate the values of molar specific heats at constant volume and pressure for monoatomic, diatomic and triatomic gases.

    3. Calculate the kinetic energy of one mole of argon at 127⁰C. given that N =6.02×1023 mol and k=1.381 x10-23 mol-1K-1

    4.Calculate the number of degrees of freedom for one mole of diatomic gas at N.T.P

     5.Calculate the number of degrees of freedom of 1 cm3 of helium gas at N.T.P.

     6.A vessel contains argon gas at 127⁰C. find the average kinetic energy of argon molecule, if      Boltzmann’s constant, k=1.38 x 10-23 j mol -1 K-1 .

    7.Calculate the total kinetic energy of 1g of helium at 27⁰C Given that R =8.31 mole -1 K-1.

    8.At what temperature is the r.m.s velocity of a hydrogen molecule equal to that of a oxygen molecule at 47⁰C ?

    9.Give the kinetic interpretation of temperature and define absolute temperature.

    10.If three molecules have velocities 0.5,1 and 2km s-1 respectively, calculate the relation between the root mean square speed and average speed.

    11. Calculate the temperature at which the r.m.s velocity of a hydrogen will be equal to 8km/hr. given that R =8.31 j mole -1.

    12. Calculate the r.m.s velocity of CO2 molecules at N.T.P. given, R=8.31 j mol -1 K-1 .

    13. Calculate the r.m.s velocity of hydrogen at N.T.P. given that density of the gas is 9×10-5 g cm -3.

    14.Find the temperature at which the root mean square velocity of a gas is double than that its value at 0 ⁰C , pressure remaining constant.

    15. The molar gas volume at S.T.P. is 22.4 litre and Avogadro number is 6.023×1023. (a) calculate the number of gas molecules per unit volume,

    16. Draw a graph to show the variation of V2 rms  with absolute temperature .

    17. When an ideal gas undergoes an isothermal expansion, the pressure of the gas in the encloser falls. Why?

    18. Two identical cylinders contains helium at 2.5 atmosphere and organ at 1 atmosphere. Find pressure if both the gases are filled in one of the cylinders?

    19. The temperature of argon, kept in vessel, is raised by 1⁰C at constant volume. The total heat supplied to the gas is a combination of translational energies. Find their respective shares.

    20. A gas mixture consist of 2moles of oxygen and 4 moles of argon at temperature T. find total internal energy of the system, when vibrational modes are rejected.

    21.During an adiabatic process, the pressure of a gas is found to be proportional to cube of its absolute temperature what is the ratio of Cp/Cv ?

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  • Important questions for class 11th (physics)

    Important questions for class 11th (physics)

    Important questions for class 11th (physics)

    This assignment contains all important questions for class 11th physics.It will help the students to revise all questions in a short period of time .

    1. If (p+ a/V2) (V-b)=RT where the symbols has their usual meanings, then what is the dimension of a/b .
    2. If F= a/ b+√d , where f=force ,d= density  , then find the dimension of a and b.
    3. The factors effecting the time period (T) of the simple pendulum depends on mass , length and acceleration due to gravity . Deduce the relation for time period of the simple pendulum.
    4. To determine acceleration due to gravity ,the time of 20 oscillations of a simple pendulum of length 100 cm was observed to be 40 s . calculate the value of ‘g’ and maximum percentage error in the measured value of ‘g’ .
    5. If power P=a-x2/b where x represents displacement  find the dimension of a and b.
    6. A physical quantity Qis given by Q= A2.B3/2/C4D1/2 percentage error in A,B,C,D are                  1%, 2%,4%,2% respectively . Find the percentage error in Q.
    7. Write the expression for distance covered in nth second by uniformly accelerated body.
    8. A ball is thrown vertically upwards. Draw its:
    • Velocity-time curve
    • Acceleration-time curve.
    1. Draw velocity -time graph of uniformly accelerated motion in one dimension .From the velocity time graph of uniform Accelerated motion ,deduce the equation of motion in distance and time.
    2. The displacement (in metre) of a particle moving along x-axis is given by

    x=18 t + 5 t2.Calculate :

    • The instantaneous velocity at t=2s,
    • Average velocity between t=2s and t=3s, and
    • Instantaneous acceleration.

     

    1. Derive an equation for the distance covered by a uniformly accelerated body in nth second of its motion. A body travels half its total path in the last second of its fall from rest . Calculate the time of its fall.

    12.A body moving with a uniform acceleration describes 12 m in 3rd second of its motion and 20 m in the 5th second . find the velocity after 10 seconds.

     

    1. A car travels first half of a length S with velocity u1. The second half is covered with velocities u2 and u3 for equal time intervals .Find the average velocity of the motion.

     

    1. A body start from rest and accelerates uniformly .find the ratio of the displacement in, (1)one, two and three seconds, (2) first ,seconds and third second.

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