MATHEMATICS, Set-I
MATHEMATICS, Set-I
MATHEMATICS, Set-I
SECTION - A
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Or
The sum of the digits of a two digit number is 15. The number obtained by interchanging
the digits exceeds the given number by 9. Find the number.
Ans.
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Q. 4. If
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Q. 6. Find the sum of the first 25 terms of an A.P. whose n th term is given by
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Which term of the Arithmetic Progression 3, 10, 17, ... will be 84 more than its 13 th
term?
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Q. 7. An electric fan is available for Rs.600 cash or for Rs.250 cash down payment
followed by 3 monthly instalments of Rs.125 each. Find the rate of interest charged under
the instalment plan.
Ans.(44.4%)
Ans. (Rs.2,420)
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SECTION B
Also find the vertices of the triangle formed by the above two lines and x-axis.
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Or
300 apples are distributed equally among a certain number of students. Had there been 10
more students, each would have received one apple less. Find the number of students.
Q. 13. A hemispherical bowl of internal diameter 30cm contains some liquid. This liquid
is to be filled into cylindrical shaped bottles each of diameter 5cm and height 6cm. Find
the number of bottles necessary to empty the bowl.
Ans.(R.H.S)
Or
Ans.(3/8)
Q. 15. Construct a triangle ABC in which BC = 6.5 cm, and altitude AD = 4.5
cm.
Q. 16. Show that the points A(2, -2), B(14, 10), C(11,13) and D(-1,1) are the vertices of a
rectangle.
Q. 18. The mean of the following frequency distribution is 57.6 and the sum of the
observations is 50. Find the missing frequency and .
Ans.
Frequency 7 12 8 5
Q. 19. A bag contains 4 red, 5 black and 6 white balls. A ball is drawn from the bag at
random. Find the probability that the ball drawn is (i) white (ii) red (iii) not black (iv) red
or white.
Ans.(2/5,4/15,2/3,2/3)
Q. 20. The following data shows the expenditure of an individual over various items:
SECTION C
Q. 21. Prove that in a right-angled triangle, the square on the hypotenuse is equal to the
sum of the squares on the other two sides.
In Prove that
Q. 22. Prove that the angle subtended by an arc at the centre is double the angle
subtended by it at any point on the remaining part of the circle.
Prove that the angle formed by a chord in the major segment is acute.
Or
Prove that the sum of either pair of opposite angles of a cyclic quadrilateral is 180 0 .
Using the above, do the following:
Find and
Q. 23. If the radii of the circular ends of a bucket, 45 cm high, are 28 cm and 7 cm (as
shown in Fig. 4), find the capacity of the bucket.
Or
A hollow cone is cut by a plane parallel to the base and the upper portion is removed. If
the curved surface of the remainder is of the curved surface of the whole cone, find the
ratio of the line segments into which the altitude of the cone is divided by the plane.
Q. 24. A man standing on the deck of a ship, which is 10 m above water level, observes
the angle of elevation of the top of a hill as 60° and angle of depression of the base of the
hill as 30°. Find the distance of the hill from the ship and height of the hill.
Q. 25. Mohan Lal has an annual income of Rs.2,50,000 (excluding HRA). He contributes
Rs. 4,000 per month in his Provident Fund and pays an annual premium of Rs. 15,000 for
his LIC policy. How much should he invest in N.S.Cs so as to get maximum rebate? He
pays Rs. 2,500 per month for 11 months towards income tax. How much income tax has
he to pay in the last month of the year?
Ans.(Rs.3,050)