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11th Standard Physics Important 5 Mark Question with Answers

11th Standard

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Physics

Time : 03:00:00 Hrs
Total Marks : 150

    Answer All The Questions

    30 x 5 = 150
  1. (i) Explain the use of screw gauge and vernier caliper in measuring smaller distances.
    (ii) Write a note on triangulation method and radar method to measure larger distances

  2. Derive the equation of motion, range and maximum height reached by the particle thrown at an oblique angle \(\theta\) with respect to the horizontal direction.

  3. Describe the method of measuring angle of repose.

  4. State and explain work energy principle. Mention any three examples for it.

  5. Explain the method to find the center of gravity of a irregularly shaped lamina?

  6. State and prove perpendicular axis theorem.

  7. Explain how Newton arrived at his law of gravitation from Kepler’s third law.

  8. Describe the measurement of Earth’s shadow (umbra) radius during total lunar eclipse.

  9. Explain the different types of modulus of elasticity?

  10. Obtain an expression for the excess of pressure inside a
    i) liquid drop
    ii) liquid bubble
    iii) air bubble.

  11. Explain the meaning of heat and work with suitable examples.

  12. Derive Mayer’s relation for an ideal gas.

  13. Find the adiabatic exponent \(\gamma\) for mixture of μ1 moles of monoatomic gas and μ2 moles of a diatomic gas at normal temperature (27°C).

  14. Explain in detail the four different types of oscillations.

  15. Show that the velocity of a travelling wave produced in a string is v\(\sqrt { \frac { T }{ \mu } } \)

  16. Discuss the relation of physics with other branches of science.

  17. Check the correctness of the following equation using dimensional analysis. Make a comment on it. S = ut + 1/4at2 where s is the displacement, u is the initial velocity, t is the time and a is the acceleration produced.

  18. Derive the relation between linear velocity and angular velocity.

  19. Find the vector sum of three vectors \(\overrightarrow { A } ,\overrightarrow { B } \ and \ \overrightarrow { C } \) , using analytical method.

  20. Two bodies A and B are moving with velocities VA and VB making an 'θ' with each other. Determine the relative velocity of A with respect to B. What will be the relative velocity.
    (i) When 2 bodies are moving in the same direction.
    (ii) When 2 bodies are moving in the opposite direction.
    (iii) When 2 bodies are moving at right angle to each other.

  21. A projectile is under an angular projection. Define expression for
    (i) Maximum height attained by a projectile.
    (ii) Time of flight and
    (iii) horizontal range

  22. Briefly explain 'centrifugal force' with suitable examples.

  23. In the section 3.7.3 (Banking of road) we have not included the friction exerted by the road on the car. Suppose the coefficient of static friction between the car tyre and the surface of the road is, calculate the minimum speed with which the car can take safe turn? When the car takes turn in the banked road, the following three forces act on the car.
    (1) The gravitational force mg acting downwards.
    (2) The normal force N acting perpendicular to the surface of the road.
    (3) The static frictional force f acting on the car along the surface.

  24. Find the workdone if a particle moves from position \(\vec { { r }_{ 1 } } =(2\overset { \wedge }{ i } +\overset { \wedge }{ j } -\overset { \wedge }{ 3k } )\) to a position \(\vec { { r }_{ 2 } } =(4\overset { \wedge }{ i } +6\overset { \wedge }{ j } -7\overset { \wedge }{ k } )\) under the effect of force \(\vec {F } =(3\overset { \wedge }{ i } +2\overset { \wedge }{ j } -\overset { \wedge }{ 4k } )\)N.

  25.  A particle of mass (m) is moving with constant velocity (v). Show that lts angular momentum about any point remains constant throughout the motion.

  26. A satellite of 600 kg orbits the Earth at a height of 500 km from its surface. Calculate its (i) Kinetic energy (ii) Potential energy and (iii) total energy

  27. A metal mass 1 kg at constant atmospheric pressure and at initial temperature 20 oC is given a heat of 20,000 J. Calculate
    (i) change in temperature
    (ii) work done and
    (iii) change in internal energy.

  28. (a) Find the adiabatic exponent \(\gamma\)  for mixture of the moles of monoatomic gas and \(\mu\) moles of diatomic gas at normal temperature. 
    (b) An oxygen molecule is travelling in air at 300 K and I atm, the diameter of oxygen molecule is 1.2\(\times\)10-10m.
    Calculate the mean free path of oxygen molecule.

  29. Explain briefly about oscillations.

  30. The bob of simple pendulum executes S.H.M is water with a period t, while the period of oscillation of the bob is to in air, neglecting frictional force of water and given that the density of the bob is \(\frac{4000}{3}\)kg m-3, find the relationship between t and t0?

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