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Free Online Mock Physics Multiple Choice Test on workenergy power
Sub Category : workenergy power Test : 4 Time Left :
1) The kinetic energy of a particle continuously increases with time. Which of the following is correct?(1) The resultant force on the particle must be parallel to the velocity at all instants. (2) The resultant force on the particle must be at an angle less than 90 degree all the time. (3) Its height above the ground level must continuously decrease. (4) The magnitude of its linear momentum is increasing continuously
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2)Which of the following is a perfectly inelastic collision?
(1) A bullet fired into a block of wood such that the bullet gets embedded into the block (2) Boy jumping on to a moving cart (3) Capture of an electron by a nucleus (4) Collision between glass balls
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3) The potential energy curve for interaction between two molecules.Which of the following statements are true?(1) The molecules have maximum attraction for r = OA (2) The molecules have maximum kinetic energy for r = OB (3) The inter-molecular force is zero for r = OB (4) For the gaseous state, the depth BD of the potential well is much smaller than kT
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4) No work is done by a force on an object if
(1) the force is always perpendicular to its velocity (2) the force is always perpendicular to its acceleration (3) the object is stationary but the point of application of the force moves on the object (4) the object moves in such a way that the point of application of the force remains fixed
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5) Two blocks A and B, each of mass m, are connected by a massless spring of natural length L and spring constant K. The blocks are initially resting on a smooth horizontal floor with the spring at its natural length as shown in Fig. 50. A third identical block C, also of mass m, moves on the floor with a speed v along the line joining A and B and collides with A. Then(1) The kinetic energy of the A-B system, at maximum compression of the spring, is zero. (2) The kinetic energy of the A-B system, at maximum compression of the spring, is mv power of 2/4. (3) The maximum compression of the spring is v Route of (m/K). (4) The maximum compression of the spring is v Route of (m/2K)
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