PUC Science 2nd PUC Class 12 - Karnataka Board PUC Question Bank Solutions

If \[\vec{a} = 3 \hat { i } + 4 \hat { j } \text{ and }  \vec{b} = \hat { i  } + \hat{ j }  + \hat{ k } ,\]  find the value of \[\left| \vec{a} \times \vec{b} \right| .\]

If \[\vec{a} = 2 \hat{ i } + \hat{ k }  , \vec{b} = \hat { i }  + \hat{ j } + \hat{ k }  ,\]  find the magnitude of  \[\vec{a} \times \vec{b} .\]

 Find a unit vector perpendicular to both the vectors  \[4 \hat{ i } - \hat{ j }  + 3 \hat{ k } \text{ and }  - 2 \hat{ i  } + \hat{ j }  - 2 \hat{ k }  .\]

Find a unit vector perpendicular to the plane containing the vectors  \[\vec{a} = 2 \hat{ i } + \hat{ j }  + \hat{ k } \text{ and }  \vec{b} = \hat{ i } + 2 \hat{ j }  + \hat{ k } .\]

Find the magnitude of \[\vec{a} = \left( 3 \hat{ k }  + 4 \hat{ j } \right) \times \left( \hat{ i }  + \hat{ j }  - \hat{ k }  \right) .\]

Find a vector of magnitude 49, which is perpendicular to both the vectors  \[2 \hat{ i }   + 3 \hat{ j }  + 6 \hat{ k }  \text{ and } 3 \hat{ i }  - 6 \hat{ j }  + 2 \hat{ k }  .\]

Find a vector whose length is 3 and which is perpendicular to the vector \[\vec{a} = 3 \hat{ i }  + \hat{ j  } - 4 \hat{ k }  \text{ and }  \vec{b} = 6 \hat{ i }  + 5 \hat{ j }  - 2 \hat{ k } .\]

Find the area of the parallelogram determined by the vector \[2 \hat{ i }  \text{ and }  3 \hat{ j } \] .

Find the area of the parallelogram determined by the vector \[2 \hat{ i } + \hat{ j } + 3 \hat{ k }  \text{ and }  \hat{ i }  - \hat{ j } \] .

Find the area of the parallelogram determined by the vector \[3 \hat{ i } + \hat{ j }  - 2 \hat{ k } \text{  and }  \hat{ i }  - 3 \hat{ j }  + 4 \hat{ k } \] .

Find the area of the parallelogram determined by the vector \[\hat{ i }  - 3 \hat{ j } + \hat{ k }  \text{ and }  \hat{ i }  + \hat{ j } + \hat{ k }  .\]

Find the area of the parallelogram whose diagonals are  \[4 \hat{ i } - \hat{ j }  - 3 \hat{ k }  \text{ and }  - 2 \hat{ j }  + \hat{ j }  - 2 \hat{ k } \]

Find the area of the parallelogram whose diagonals are  \[2 \hat{ i }+ \hat{ k } \text{ and } \hat{ i } + \hat{ j } + \hat{ k } \]

Find the area of the parallelogram whose diagonals are  \[3 \hat{ i }  + 4 \hat{ j }  \text{ and } \hat{ i } + \hat{ j } + \hat{ k }\]

Find the area of the parallelogram whose diagonals are \[2 \hat{ i }  + 3 \hat{ j } + 6 \hat{ k } \text{ and }  3 \hat{ i }  - 6 \hat{ j }  + 2 \hat{ k } \]

If \[\vec{a} = 2 \hat{ i }  + 5 \hat{ j }  - 7 \hat{ k }  , \vec{b} = - 3 \hat{ i } + 4 \hat{ j }  + \hat{ k }  \text{ and } \vec{c} = \hat{ i }  - 2 \hat{ j }  - 3 \hat{ k }  ,\] compute \[\left( \vec{a} \times \vec{b} \right) \times \vec{c} \text{ and }  \vec{a} \times \left( \vec{b} \times \vec{c} \right)\]  and verify that these are not equal.

Given \[\vec{a} = \frac{1}{7}\left( 2 \hat{ i } + 3 \hat{ j } + 6 \hat{ k }  \right), \vec{b} = \frac{1}{7}\left( 3 \hat{ i } - 6 \hat{ j }  + 2 \hat{ k }  \right), \vec{c} = \frac{1}{7}\left( 6 \hat{ i } + 2 \hat{ j }  - 3 \hat{ k }\right), \hat{ i } , \hat{ j }  , \hat{ k } \] being a right handed orthogonal system of unit vectors in space, show that \[\vec{a} , \vec{b} , \vec{c}\] is also another system.