MEDIUM
JEE Main
IMPORTANT
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All the graphs below are intended to represent the same motion. One of them does it incorrectly. Pick it up.
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Important Questions on Engineering Entrance Solved Papers 2018 JEE Main & Advanced/BITSAT/KCET/Andhra Pradesh & Telangana (EAMCET)/VIT/MHT CET
EASY
JEE Main
IMPORTANT
A particle is moving in a circular path of radius under the action of attractive potential energy . Its total energy is
MEDIUM
JEE Main
IMPORTANT
A reservoir is at and Carnot's engine takes a thousand kilocalories of heat from it and exhausts it to a sink at . What is the amount of work and the efficiency of the engine?
HARD
JEE Main
IMPORTANT
An object of mass is projected with a velocity at an angle to the horizontal. At the highest point of its path, the projectile explodes and breaks up into two fragments of masses and . The fragments separate horizontally after the explosion, which releases internal energy such that the kinetic energy of the system at the highest point is doubled. The separation between the two fragments when they reach the ground is,
EASY
JEE Main
IMPORTANT
Consider the acceleration, velocity and displacement of a tennis ball as its falls to the ground and bounces back. Directions of which of these change in the process?
MEDIUM
JEE Main
IMPORTANT
If the time period is doubled, then the angular momentum of the body will (provided the moment of inertia of the body is constant),
HARD
JEE Main
IMPORTANT
A stone is projected with velocity , so that it just clears two walls of equal height at distance of from each other. The time interval of passing between the two walls is,
HARD
JEE Main
IMPORTANT
Helium gas goes through a cycle (consisting of two isochoric and two isobaric lines) as shown in figure. The efficiency of this cycle is approximately
MEDIUM
JEE Main
IMPORTANT
A pulley of radius is rotated about its axis by a force newton (where is measured in seconds) applied tangentially. If the moment of inertia of the pulley about its axis of rotation is , the number of rotation made by the pulley before its direction of motion is reversed is
