CBSE Board Class 10 Math Previous Year Question Papers 2008

MATHEMATICS

SECTION - A
Question numbers 1 to 10 carry 3 marks each.

Q. 1. Using factorisation, express the following as a rational expression in lowest terms:

Q. 2. Find the HCF of the following polynomials:
30x 2y2 (x 4 - x3  - 2x 2 ); 42(x 6 – 8x 3 ) and 24x 6y6 (x 2 – 5x + 6) 

Q. 3. Which term of the arithmetic progression 5, 15, 25, ….. will be 130 more its 31st
term?

Q. 4. In an AP, the sum of first n terms is , Find its 20th term.

Q. 5. Solve the following equations for x and y:
          Or
The sum of the numerator and the denominator of a fraction is 12. If the denominator is increased by
3, the fraction becomes ½ . Find the fraction

Q. 6. Rewrite the following as a quadratic equation in x and then solve for x:

Q. 7. An article is available for Rs. 7,000 cash or for Rs. 1,900 cash down payment and six monthly
installments of Rs. 920 each. Compute the rate of interest under the installments scheme.

Q. 8. A man pays back a bank loan of Rs. 10,815 in three equal half yearly installments. If rate of
interest is 13⅓% per annum compounded half yearly, find the amount of each installment.

Q. 9. In figure 1, S and T trisect the side QR of a right triangle PQR. Prove that 8 PT2 = 3 PR2+ 5 PS 2
  Or
If BL and CM are medians of a triangle ABC right-angled at A, then prove that 4 (BL2 + CM2) = 5 BC2

Q. 10. In figure 2, O is the centre of the circle. Prove that 

SECTION – B

Q. 11. Solve the following equations graphically for x and y:
3x + 2y = 12 and 5x – 2y = 4
Find the coordinates of the points where the lines meet the y-axis.

Q. 12. Construct a triangle ABC in which BC = 6 cm, and altitude through A is 4.2 cm. How
many such triangles are possible?

Q. 13. Without using trigonometric tables evaluate the following:

Q. 14. A 2-digit number is such that the product of its digits is 18. When 63 is subtracted from the
number, the digits interchange their places. Find the number.  
Or
A train covers a distance of 90 km at a uniform speed. Had the speed been 15 km/hour more, it
would have taken 30 minutes less for the journey. Find hte original speed of the train. 

Q. 15. Find the mean of the following frequency distribution:
Classes
0 -20 20 - 40 40 - 60 60 -80 80 - 100
Frequency
15 18 21 29 17

Q. 16. The expenditure of a firm on various heads is represented by the pie chart shown in Figure 3.
If the total expenditure of the firm is Rs. 72 lakh. find out the following:
i. Expenditure on equipment
ii. Difference between expenditure on wages and miscellaneous expenditure
iii. Total expenditure on rent and stationery
iv. Difference between wages and equipment expenditure.

Q. 17. From a pack of 52 playing cards, jacks, queens, kings and aces of red colour are removed. From
the remaining, a card is drawn at random. Find the probability that the card drawn is
i. a black queen
ii. a red card
iii. a blackjack
iv. a picture card (jacks, queens and kings are picture cards) 

Q. 18. Prove that the points (-4, -1); (-2, -4); (4, 0) and (2, 3) are vertices of a rectangle.

Q. 19. If (-2, -1); (a, 0); (4, b) and (1, 2) are the vertices of a parallelogram, find the values of a and b.  Q. 20. A vessel is in the form of a hemispherical bowl mounted by a hollow cylinder. The diameter of
the hemisphere is 14 cm and the total height of the vessel is 13 cm. Find the capacity of the vessel.

SECTION - C
Question numbers 21 to 25 carry 6 marks each.

Q. 21. If a line is drawn through an end point of a chord of a circle so that the angle formed by it with
the chord is equal to the angle subtended by the chord in the alternate segment, then the line is a
tangent to the circle. Prove it.
In each of the following, (i) and (ii) (in Figure 4), if a circle is drawn through A, B and D, then using
the above theorem, examine in which case is the line BC a tangent.

Q. 22. A man on the top of a vertical tower observes a car moving at uniform speed towards the
tower. If it takes 12 minutes for the angle of depression to change from 300
to 450, how soon, after
this, will the car reach the tower?
Or
The angle of elevation of the top of a hill at the foot of the tower is 600
and the angle of elevation of
the top of the tower from the foot of the hill is 300
. If the tower is 50 m high, find the height of the hill.

Q. 23. In a triangle, if the square on one side is equal to the sum of the squares on the remaining two,
the angle opposite the first side is a right angle. Prove it.
Using the above prove the following:
If in a and PS 2= QS X RS, then is right – angled at P.

Q. 24. A bucket made of aluminium sheet is of circular pipe in half hour height 20 cm and its upper
and lower ends are of radius 25 cm and 10 cm respectively. Find the cost of making the bucket if the
aluminium sheet costs Rs. 70 per 100 cm2
. 
Or
Water flows out through a circular pipe, whose internal diameter is 2 cm, at the rate of 0.7 m per
second into a cylindrical tank. The radius of whose base is 40cm. By how much will the level of water
in the cylindrical tank rise in half an hour? Q. 25. The Annual income from salary of Mrs. Usha, who is a senior citizen, is Rs. 3,85,000. She
donates Rs. 10,000 to Prime Minister’s Relief Fund (100% exemption) and Rs. 10,000 to a Charitable
Society (50% exemption). She contributes Rs. 70,000 towards PPF annually and pays a quarterly
premium of Rs. 3,500 towards Life Insurance. She also purchases NSCs for Rs. 20,000. She pays Rs.
1,600 per month towards income tax for 11 months. What is her tax liability for the last month of the
financial year? 
Use the following for calculating income tax: 
1. Savings: 100% exemption for savings upto Rs. 1,00,000
2. Rate of Income tax : 
Slab Income Tax
i. Taxable income upto Rs.1,00,000
ii. Taxable income from Rs. 1,00,001 to
Rs.1,50,000
iii. Taxable income from Rs. 1,50,001 to Rs.
2,50,000
iv. Taxable income above Rs. 2,50,000
v. Education cess 
NIL
10% of the amount by which taxable income
exceeds Rs. 1,00,000.
Rs. 5,000 + 20% of the amount by which taxable
income exceeds Rs. 1,50,000.
Rs. 25,000 + 30% of the amount by which taxable
income exceeds Rs. 2,50,000 
2% of the amount of tax payable.