Subject

Mathematics

Class

CBSE Class 12

Pre Boards

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Sample Papers

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 Multiple Choice QuestionsShort Answer Type

21.

If straight x equals straight a space sint space and space straight y space equals space straight a open parentheses cost plus log space tan straight t over 2 close parentheses space find space fraction numerator straight d squared straight y over denominator dx squared end fraction

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22.

Evaluate: integral fraction numerator sin left parenthesis straight x minus straight a right parenthesis over denominator sin left parenthesis straight x plus straight a right parenthesis end fraction dx

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23.

Evaluate:
integral fraction numerator 5 straight x minus 2 over denominator left parenthesis 1 plus 2 straight x plus 3 straight x squared end fraction dx

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24.

Evaluate:
integral fraction numerator straight x squared over denominator left parenthesis straight x squared plus 4 right parenthesis left parenthesis straight x squared plus 9 right parenthesis end fraction dx


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25.

Evaluate: integral subscript 0 superscript 4 open parentheses open vertical bar straight x close vertical bar plus open vertical bar straight x minus 2 close vertical bar plus open vertical bar straight x minus 4 close vertical bar close parentheses dx

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26.

If straight a with rightwards arrow on top space and space straight b with rightwards arrow on top are two vectors such that open vertical bar straight a with rightwards arrow on top plus straight b with rightwards arrow on top close vertical bar equals open vertical bar straight a with rightwards arrow on top close vertical bar comma then prove that vector 2 straight a with rightwards arrow on top plus straight b with rightwards arrow on top is perpendicular to vector straight b with rightwards arrow on top.

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27.

Find the coordinates of the point, where the line fraction numerator straight x minus 2 over denominator 3 end fraction equals fraction numerator straight y plus 1 over denominator 4 end fraction equals fraction numerator straight z minus 2 over denominator 2 end fraction intersects the plane straight x minus straight y plus straight z minus 5 space equals space 0. Also find the angle between the line and the plane. 


The equation of the given line is fraction numerator straight x minus 2 over denominator 3 end fraction equals space fraction numerator straight y plus 1 over denominator 4 end fraction equals fraction numerator straight z minus 2 over denominator 2 end fraction space space... left parenthesis 1 right parenthesis
Any point on the given line is left parenthesis 3 straight lambda plus 2 comma space 4 straight lambda minus 1 comma space 2 straight lambda plus 2 right parenthesis.
If this point lies on the given plane x - y + z - 5 = 0, then
3 straight lambda plus 2 minus left parenthesis 4 straight lambda minus 1 right parenthesis plus 2 straight lambda plus 2 minus 5 space equals space 0
rightwards double arrow straight lambda space equals space 0
Putting straight lambda space equals space 0 in left parenthesis 3 straight lambda plus 2 comma space 4 straight lambda minus 1 comma space 2 straight lambda plus 2 right parenthesis comma we get the point of intersection of the given line and the plane is (2, -1, 2).
Let straight theta be the angle between the given line and the plane. 
therefore space space sin space straight theta space equals space fraction numerator straight a with rightwards arrow on top. straight b with rightwards arrow on top over denominator open vertical bar straight a with rightwards arrow on top close vertical bar open vertical bar straight b with rightwards arrow on top close vertical bar end fraction space equals fraction numerator left parenthesis 3 straight i with rightwards arrow on top plus 4 straight j with rightwards arrow on top plus 2 stack straight k right parenthesis with rightwards arrow on top. left parenthesis straight i with rightwards arrow on top minus straight j with rightwards arrow on top plus straight k with rightwards arrow on top right parenthesis over denominator square root of 3 squared plus 4 squared plus 2 squared end root square root of 1 squared plus 1 squared plus 1 squared end root end fraction equals fraction numerator 3 minus 4 plus 2 over denominator square root of 29 square root of 3 end fraction equals fraction numerator 1 over denominator square root of 87 end fraction
rightwards double arrow straight theta space equals sin to the power of negative 1 end exponent open parentheses fraction numerator 1 over denominator square root of 87 end fraction close parentheses
Thus, the angle between the given line and the given plane is sin to the power of negative 1 end exponent open parentheses fraction numerator 1 over denominator square root of 87 end fraction close parentheses.


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28.

Find the vector equation of the plane which contains the line of intersection of the planes. straight r with rightwards arrow on top. open parentheses straight i with hat on top plus 2 straight j with hat on top plus 3 straight k with hat on top close parentheses minus 4 space equals 0 and straight r with rightwards arrow on top. open parentheses 2 straight i with hat on top plus straight j with hat on top minus straight k with hat on top close parentheses plus 5 space equals 0 and which is perpendicular to the plane straight r with rightwards arrow on top. space open parentheses 5 straight i with hat on top plus 3 straight j with hat on top minus 6 straight k with hat on top close parentheses plus 8 space equals space 0

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29.

A speaks truth in 60% of the cases, while B in 90% of the cases. In what percent of cases are they likely to contradict each other in stating the same fact? In the cases of contradiction do you think, the statement of B will carry more weight as he speaks truth in more number of cases than A?

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 Multiple Choice QuestionsLong Answer Type

30.

Using integration, find the area bounded by the curve x2 = 4y and the line x = 4y – 2.

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