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11th Standard English Medium Physics Subject Work, Energy and Power Book Back 1 Mark Questions with Solution Part - I

11th Standard

    Reg.No. :
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Physics

Time : 00:30:00 Hrs
Total Marks : 5

    Part I

    5 x 1 = 5
  1. The work done by the conservative force for a closed path is

    (a)

    always negative

    (b)

    zero

    (c)

    always positive

    (d)

    not defined

  2. If the potential energy of the particle is \(\alpha -\frac { \beta }{ 2 } { x }^{ 2 }\), then force experienced by the particle is

    (a)

    F = \(\frac { \beta }{ 2 } { x }^{ 2 }\)

    (b)

    F = βx

    (c)

    F = -βx

    (d)

    F = -\(\frac { \beta }{ 2 } { x }^{ 2 }\)

  3. A particle is placed at the origin and a force F = kx is acting on it (where k is a positive constant). If U (0) = 0, the graph of U(x) versus x will be (where U, is the potential , energy function)

    (a)

    (b)

    (c)

    (d)

  4. A spring of force constant k is cut into two pieces such that one piece is double the length of the other. Then, the long piece will have a force constant of

    (a)

    \(\frac{2}{3}\)k

    (b)

    \(\frac{3}{2}\)k

    (c)

    3k

    (d)

    6k

  5. Two equal masses m1 and m2 moving along the same straight line with velocities +3 m/s and -5 m/s respectively collide elastically. Their velocities after the collision will be respectively _______________.

    (a)

    - 4 m/s and +4 m/s

    (b)

    +4 m/s for both

    (c)

    - 3 m/s and +5 m/s

    (d)

    - 5 m/s and + 3 m/s

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