Subject

Mathematics

Class

CBSE Class 12

Pre Boards

Practice to excel and get familiar with the paper pattern and the type of questions. Check you answers with answer keys provided.

Sample Papers

Download the PDF Sample Papers Free for off line practice and view the Solutions online.
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 Multiple Choice QuestionsShort Answer Type

21. Find space colon integral fraction numerator straight x squared plus straight x plus 1 over denominator left parenthesis straight x squared plus 1 right parenthesis left parenthesis straight x plus 2 right parenthesis end fraction dx
1137 Views

22. Evaluate space colon space integral subscript negative 2 end subscript superscript 2 fraction numerator straight x squared over denominator 1 plus 5 to the power of straight x end fraction dx.
799 Views

23. Find colon space integral left parenthesis straight x plus 3 right parenthesis square root of 3 minus 4 straight x minus straight x squared space end root space dx.
693 Views

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24.

Find the particular solution of the differential equation
dy over dx equals negative fraction numerator x plus y space c o s space x over denominator 1 plus s i n space x space end fraction space g i v e n space t h a t space y equals 1 space w h e n space x equals 0


dy over dx equals negative fraction numerator straight x plus ycosx over denominator 1 plus sin space straight x end fraction

rightwards double arrow space dy over dx plus fraction numerator cosx over denominator 1 plus sinx end fraction straight y equals negative fraction numerator straight x over denominator 1 plus sin space straight x end fraction space..... space left parenthesis straight i right parenthesis

This space is space straight a space linear space differential space equation space with

straight P space equals space fraction numerator cosx over denominator 1 plus sin space straight x end fraction comma space straight Q space space equals negative fraction numerator straight x over denominator 1 plus sin space straight x end fraction

therefore comma

straight I. straight F. space equals space straight e to the power of integral fraction numerator cosx over denominator 1 plus sin space straight x end fraction dx end exponent

equals space space straight e to the power of log space left parenthesis 1 plus sinx right parenthesis end exponent

equals 1 space plus space sin space straight x

Multiplying space both space sides space of space left parenthesis straight i right parenthesis space by space straight I. straight F. space equals space 1 space plus space sin space straight x comma space we space get
left parenthesis 1 plus sinx right parenthesis dy over dx plus straight y space cos space straight x space equals space minus straight x

Integrating space space with space respect space to space straight x comma space we space get
straight y left parenthesis 1 plus sin right parenthesis space equals integral negative xdx space plus space straight C

rightwards double arrow space space straight y space equals space fraction numerator 2 straight C minus straight x squared over denominator 2 left parenthesis 1 plus sinx right parenthesis end fraction space...... space left parenthesis ii right parenthesis

Given space that space straight y space equals 1 space when space straight x equals space 0
thus comma
1 space equals fraction numerator 2 straight C over denominator 2 left parenthesis 1 plus 0 right parenthesis end fraction

rightwards double arrow space space straight C space equals 1 space space....... space left parenthesis iii right parenthesis

Put space left parenthesis iii right parenthesis space space in space space left parenthesis ii right parenthesis comma space space we space get

straight y space equals space fraction numerator 2 minus straight x squared over denominator 2 left parenthesis 1 plus sin space straight x space right parenthesis end fraction
1130 Views

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25.

Find the particular solution of the differential equation

2yex/y dx+ (Y-2xex/y) dy =0

Given that x=0 when y=1.

761 Views

26.

Find the coordinates of the foot of perpendicular drawn from the point A
(-1,8,4) to the line joining the points B(0,-1,3) and C(2,-3,-1). Hence find the image of the point A in the line BC.

1957 Views

27.

A bag X contains 4 white balls and 2 black balls, while another bag Y contains 3 white balls and 3 black balls. Two balls are drawn (without replacement) at random from one of the bags and were found to be one white and one black. Find the probability that the balls were drawn from bag Y.

1714 Views

28.

A and B throw a pair of dice alternately, till one of them gets a total of 10 and wins the game. Find their respective probabilities of winning, if A starts first.

1883 Views

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 Multiple Choice QuestionsLong Answer Type

29.

Three numbers are selected at random (without replacement) from first six positive integers. Let X denote the largest of the three numbers obtained. Find the probability distribution of X.Also, find the mean and variance of the distribution.

2275 Views

30.

Using the method of integration, find the area of the triangular region whose vertices are (2, -2), (4, 3) and (1, 2).

1133 Views

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