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    7.

    The motion which is not simple harmonic is

    A

    Vertical oscillations of a spring

    B

    Motion of simple pendulum

    C

    Motion of a planet around the sun

    D

    Oscillation of liquid column in a U-tube

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    10.

    A particle moves so that its position vector is given by ro=cosωtx^+sinωty^.\mathop {\rm{r}}\limits^ o \, = \,\cos {\rm{\omega }}\,{\rm{t}}\,{\rm{\hat x}}\,{\rm{ + }}\,{\rm{sin}}\,{\rm{\omega }}\,{\rm{t}}\,{\rm{\hat y}}{\rm{.}} Where ω{\rm{\omega }} is a constant. Which of the following is true?

    A

    Velocity and acceleration both are perpendicular to ro.\mathop {\rm{r}}\limits^ o \,.

    B

    Velocity and acceleration both are parallel to ro.\mathop {\rm{r}}\limits^ o \,.

    C

    Velocity is perpendicular to ro\mathop {\rm{r}}\limits^ o and acceleration is directed towards the origin.

    D

    Velocity is perpendicular to ro\mathop {\rm{r}}\limits^ o and acceleration is directed away from the origin.

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