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Physics Test 21...

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  • Question 1
    4 / -1

    A block of mass 0.5 kg is at rest on a horizontal table. The coefficient of kinetic friction between the table and the block is 0.2. If a horizontal force of 5 N is applied on the block, the kinetic energy of the block in a time of 4 s is (Acceleration due to gravity = 10ms−2

  • Question 2
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    The potential energy of a particle (Ux) executing S.H.M. is given by

  • Question 3
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    A system consists of three particles each of mass 'm1' placed at the corners of an equilateral triangle of side  A particle of mass 'm2' is placed at the mid point of any one side of the triangle. Due to the system of particles, the force acting on m2 is

  • Question 4
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    The stress versus strain graphs for wires of two materials A and B are as shown in the figure. If YA and YB are the Young's modulii of the materials, then:

  • Question 5
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    Four massless springs whose force constants are 2k, 2k, k and 2k respectively are attached to a mass M kept on a frictionless plane (as shown in figure). If the mass M is displaced in the horizontal direction, then the frequency of the system

  • Question 6
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    A steel wire of length 3 m and a copper wire of length 2.2 m are connected end to end. When the combination is stretched by a force, the net elongation is 1.05 mm. If the area of cross-section of each wire is 6mm2, then the load applied is (Young's moduli of steel and copper are respectively 2 × 1011 Nm-2 and 1.1 × 1011 Nm-2 ).

  • Question 7
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  • Question 8
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    A ball of mass 0.2kg is thrown vertically upwards by applying a force by hand. If the hand moves 0.2m while applying the force and the ball goes upto 2m height further, find the magnitude of the force. (Consider g = 10m/s2).

  • Question 9
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    In the following diagram, the work done in moving a point charge from point P to point A, B and C are WA, WB, and WC respectively. Then (A, B, C are points on semicircle and point charge q is at the centre of semicircle)

  • Question 10
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    A particle is projected with velocity v0 along x-axis. A damping force is acting on the particle which is proportional to the square of the distance from the origin i.e. ma = -αx2. The distance at which the particle stops:

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