Physics Questions Class XI CBSE
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12/18/2011
CBSE
 What are errors? Describe the propagation of errors in addition
subtraction multiplication and division.  What do you mean by the principle of homogenity of dimensions? Describe
the applications of dimensional analysis.  Derive the equations of uniformly accelerated motion (graphically)
 Define projectile motion. Derive expression for Time of Flight, Horizontal
Range and maximum height of a projectile.  Derive an expression for the trajectory of a projectile.
 Show that there are two possible angles of projection for obtaining the
same range.  Derive an expression for centripetal acceleration in Uniform Circular
motion.  Derive F=ma from Newton’s second law of motion.
 State and explain Newton’s laws of motion.
 Show that Newton’s I law and Third law can be derived from II law.
 A light inextensible string with ends connected to two unequal masses runs
over a frictionless pulley and is free to move. Derive an expression for the
acceleration of the masses and the tension in the string.  State Impulse – momentum principle and explain its applications.
 Why does a cricket player pulls his hands backwards while taking a catch?
Describe similar situations of the principle based on which he does so.  Explain the cause of friction.
 Why friction is called a necessary evil?
 Describe the different methods used to reduce friction.
 Derive an expression for the maximum safe velocity of a car on a level
road.  What do you mean by banking of roads at curves? Derive and expression for
the maximum safe velocity of a car on a banked road and hence derive the
velocity at curve on a banked road for minimum wear and tear.  Derive an expression for the minimum horizontal velocity to be given to a
ball hanging vertically from a point so that it is able to just complete a
vertical circular path.  Derive expression for the tension in a string at the top and bottom
position while a body attached to its end describes a vertical circle.  State and prove work – Kinetic energy theorem
 State the principle of conservation of energy. Show that the total
mechanical energy of a body falling freely from a height remains constant
throughout its motion.  Distinguish between elastic and inelastic collisions
 Show that there is always a loss of kinetic energy in ordinary inelastic
collisions.  Derive an expression for the velocities after elastic collision between
two bodies.  Discuss elastic collision in two dimensions
 Derive the relationship between momentum and kinetic energy.
 Two particles of different mass have the same momentum; which one has
greater kinetic energy – the light body or the heavy body?  Two particles of different mass have the same kinetic energy; which one
has greater momentum – the light body or the heavy body?  Define radius of gyration.
 Define moment of inertia.
 Derive an expression for the centre of mass of a two particle system.
 Derive an expression for the rotational kinetic energy of a rigid body
 Derive an expression for the angular momentum of a rigid body
 State the principle of conservation of angular momentum and explain its
applications.