30.doc

SAMPLE PAPER - 2008

Class - X

SUBJECT - MATHEMATICS

 

Time-3hours                                                                                                                                      Marks:80

                                                   SECTION-A

1) Find the HCF of 273070 and 434330.                       (10)

2) Find  a quadratic polynomial whose zeroes are 3and -5.                  (x2+2x-15)

3) Determine the value of c for which the following system of linear equations has no solution; cx+3y=3, 12x+cy=6.                            (-6)

4) Solve : 2x2-5x+3=0                (3/2,1)

5) Determine the 2nd term of an AP whose 6thterm is 12 and 8th term is 22.         (-8)

6) Simplify: (1+tan2θ)(1-sinθ)(1+sinθ)                              (1)

7) Find the sum of first hundred even natural numbers divisible by 5.    (50500)

8) Find the coordinates of a point which divides the line joining (1,3) and (2,-1) in the ratio 3:2 internally.                     (8/5,3/5)

9) Using similar triangles prove that the line drawn from the midpoint of one side of a triangle and // l to another side bisects the third side.

10) Three unbiased coins are tossed .What is the probability of getting 2heads?   (3/8)

                                                       SECTION-B

11)The mean weight of 150 students in a class is 60kg.The mean weight of boys is 70kg while that of girls is 55kg.Find the number of boys and girls in the school?                          (50, 100)

12)A vessel is in the form of a hollow hemisphere mounted by a hollow cylinder. The diameter of the hemisphere is 14cm and the total height of the vessel is 13cm.Find the inner surface area of the vessel.                     (572sq.cm)

    A                     

          x                  D

 

 

       146º

E           B             C

13)The circumference of a circle exeeds its diameter by 16.8cm.Find the radius of the circle.                 (3.92cm)

14)In the figure find x if ∟EBD=1460.

 

 

 

15)A ladder 10m long ,when placed against a wall ,reaches a window 8m high from ground .Find the distance of foot of the ladder from the bottom of the wall.  (6cm)

                                           SECTION-C

16)State and prove Pythagoras theorem .Use this theorem and calculate area(∆PMR) from the given figure . ∟PMR=90º.

                                                          P

 

 

                                                  6cm

                                               M      90º                                                                                                                                                                                                       

                                                    

                           Q                         8cm                R

                                                                            

17)P.T.(4,-1),(6,0),(7,2)and(5,1)are vertices of a rhombus?Is it a square ?

18)a)   P.T. [ (1+Sinθ- Cosθ)/(1+Sinθ+Cosθ)]2=( 1-Cosθ)/ (1+Cosθ).

    b)If tanA=n tanB and SinA=m SinB,p.t.Cos2A=(m2-1)/ (n2-1).

19)The sum of the first p,q,r terms of an A.P.are a,b,c respectively then show that:

            a(q-r)+b(r-p)+c(p-q)=0

                p           q        r        .

20)A spiral is made up of successive semicircles, with centres alternately at A and B,starting with centre at A,of radii .5cm,1.0cm,1.5cm,2.0cm.What is the total length of  such a spiral made up of thirteen consecutive semicircles?           (143)

21)If twice the area of the larger square is subtracted from the area of the large square,the result is 14sq.cm.However if twice the area of the larger square is added to three times the area of the smaller square the result is 203sq.cm .Determine the sides of 2 squares.                                            (8cm, 5cm)

22)If the roots of the equation (a2+b2)x2-2(ac+bd)x+(c2+d2)=0 are equal p.t.a/b=c/d.

23)Solve :               1        +           1                   =17

                      2(2x+3y)          7(3x-2y)                 70

            7      -                7            =         -28

      (2x+3y)             ( 3x-2y)                   5

24)A boat goes 24km upstream and 28km downstream in 6hrs.It goes 30km upstream and 21km down stream in 6.5hrs.Find the speed of boat in still water and also speed of stream.                                     (10,4)

25) On dividing the polynomial 4x4-5x3-39x2 -46x-2 by the polynomial g(x),the quotient is x2-3x-5 and the remainder is -5x+8.Find g(x).

                                              SECTION-D

26)A sector of a circle of radius 15cm has the angle 120º.It is rolled up so that two bounding radii are joined together .What is the solid form you get?Find its volume and

TSA.                          (370.33              cm³)

27) Draw a circle of radius 3cm.Take 2 points P and Q on one of its extended diameter each at a distance of 7cm from its centre. Draw tangents to the circle from these 2 points PandQ.

28)Prove that the length of tangents  from an external point  are equal. A circle is inscribed in ∆ABC having sides 8cm,10cm and 12cm to meet AB at D,BC at E and AC at F.Find AD,BE and CF.      (7cm,5cm,3cm)

29)In a right triangle p.t. the square of hypotenuse is equal to the sum of the squares of the other two sides.

                            In quadrilateral ABCD.AB┴BD, CD┴BD, CD=6cm, DB=12cm, AB=11cm.Find AC.              (13cm)

30) a)From the terrace of a house 8cm high ,the angle of elevation of the top of a tower is 45º and the angle of depression of its reflection in a lake is found to be 60º.Determine the height of the tower from the ground.    (29.86m)

b)P.T .CosecA     +   CosecA      =     2Sec²A.

          CosecA-1       CosecA+1