1.

    A unit vector perpendicular to both i^+j^\hat{i} + \hat{j} and j^+k^\hat{j} + \hat{k} is:

    A

    i^\hat{i}

    B

    j^\hat{j}

    C

    12(i^k^)\frac{1}{\sqrt{2}}(\hat{i} - \hat{k})

    D

    13(i^j^+k^)\frac{1}{\sqrt{3}}(\hat{i} - \hat{j} + \hat{k})

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    3.

    Two vectors AandB{\rm{\vec A}}\,and\,{\rm{\vec B}} are inclined to each other at an angle θ. Which of the following is the unit vector perpendicular to both AandB{\rm{\vec A}}\,and\,{\rm{\vec B}} ?

    A

    AimesBAB\sinheta\frac{\vec{A} imes \vec{B}}{|\vec{A}||\vec{B}|\sinheta}

    B

    AimesBAB\cosheta\frac{\vec{A} imes \vec{B}}{|\vec{A}||\vec{B}|\cosheta}

    C

    ABAB\sinheta\frac{\vec{A} \cdot \vec{B}}{|\vec{A}||\vec{B}|\sinheta}

    D

    ABAB\cosheta\frac{\vec{A} \cdot \vec{B}}{|\vec{A}||\vec{B}|\cosheta}

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    6.

    Which of the following is NOT an example of a co-initial vector?

    A

    Two vectors starting at the same point and having different magnitudes.

    B

    Two vectors starting at the same point and having the same direction.

    C

    Two vectors starting at the same point and having different directions.

    D

    Two vectors originating from different points and ending at the same point.

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    8.

    Two vectors AandB{\rm{\vec A}}\,and\,{\rm{\vec B}} are inclined to each other at an angle θ. Which of the following is the unit vector perpendicular to both AandB{\rm{\vec A}}\,and\,{\rm{\vec B}} ?

    A

    AimesBABsinheta\frac{\vec{A} imes \vec{B}}{|\vec{A}||\vec{B}|\sin{heta}}

    B

    AimesBABcosheta\frac{\vec{A} imes \vec{B}}{|\vec{A}||\vec{B}|\cos{heta}}

    C

    ABABsinheta\frac{\vec{A} \cdot \vec{B}}{|\vec{A}||\vec{B}|\sin{heta}}

    D

    ABABcosheta\frac{\vec{A} \cdot \vec{B}}{|\vec{A}||\vec{B}|\cos{heta}}

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