by
Reema Narula
added on Mon Feb 16 06:23:54 UTC 2015 4088 views

Question - In a school, students decided to plant trees in and around the school to reduce air
pollution. It was decided that the number of trees, that each section of each class will
plant, will be double of the class in which they are studying. If there are 1to 12
classes in the school and each class has two sections, find how many trees were
planted by the students. Which value is shown in this question?
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Purnima Lodha
added on Fri Feb 27 12:25:11 UTC 2015 1602 views

Question - AB + CD = AD + BC
Prove that the tangent at any point of a circle is perpendicular to the radius through the point of contact.
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Purnima Lodha
added on Fri Feb 20 11:39:14 UTC 2015 1020 views

Question - In fig., l and m are two parallel tangents to a circle with centre O, touching the circle at A and B respectively. Another tangent at C intersects the line l at D and m at E. Prove that --DOE 90--
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Reema Narula
added on Mon Feb 16 06:28:39 UTC 2015 607 views

Question - A(4, - 6), B(3,- 2) and C(5, 2) are the vertices of a 8 ABC and AD is its median.
Prove that the median AD divides 8 ABC into two triangles of equal areas.
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Reema Narula
added on Mon Mar 02 14:02:23 UTC 2015 514 views

Question - 150 spherical marbles, each of diameter 1.4 cm, are dropped in a cylindrical vessel of diameter 7 cm containing some water, which are completely immersed in water. Find the rise in the level of water in the vessel.
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Reema Narula
added on Fri Feb 20 10:24:19 UTC 2015 491 views

Question - In Figure 2, ABCD is a trapezium of area 24.5 sq. cm. In it, AD|| BC, ----DAB = 90°, AD = 10 cm and BC = 4 cm. If ABE is a quadrant of a circle, find the area of the shaded region. [ Use ------ ]
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Purnima Lodha
added on Fri Feb 27 11:23:01 UTC 2015 418 views

Question - Find the sum of all three digit natural numbers, which are multiples of 7.
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2015 CBSE Class 10: Solved questions contain the following topics:
Series and Progressions,
Arithmetic Progression,
Quadratic Equations,
Trigonometry and Applications - Heights and distances,
Coordinate Geometry
Probability
Area related to Circles
Volumes and Surface areas - Cones and Cylinders (VBQ)
Volumes and Surface areas - Spheres and Hemispheres
Combination of Solids
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Reema Narula
added on Fri Feb 20 10:28:57 UTC 2015 364 views

Question - The angle of elevation of an aeroplane from a point on the ground is 60°. After a flight of 30 seconds the angle of elevation becomes 30° If the aeroplane is flying at a constant height of 3000--- 3 m, find the speed of the aeroplane.
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Reema Narula
added on Mon Mar 02 14:07:38 UTC 2015 342 views

Question - Water in a canal, 6 m wide and 1.5 m deep, is flowing at a speed of 4 km/h. How much area will it irrigate in 10 minutes, if 8 cm of standing water is needed for irrigation?
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Reema Narula
added on Fri Feb 20 10:23:20 UTC 2015 336 views

Question - The sum of the 2nd and the 7th terms of an AP is 30. If its 15th term is 1 less than twice its 8th term, find the AP.
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Purnima Lodha
added on Fri Feb 20 11:58:50 UTC 2015 292 views

Question - Water is flowing through a cylindrical pipe, of internal diameter 2 cm, into a cylindrical tank of base radius 40 cm, at the rate of 0.4 m/s. Determine the rise in level of water in the tank in half an hour.
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Reema Narula
added on Mon Feb 16 06:24:28 UTC 2015 290 views

Question - Solve for x : ..........
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Purnima Lodha
added on Fri Feb 20 11:56:51 UTC 2015 271 views

Question - bucket open at the top, and made up of a metal sheet is in the form of a frustum of a cone. The depth of the bucket is 24 cm and the diameters of its upper and lower circular ends are 30 cm and 10 cm respectively. Find the cost of metal sheet used in it at the rate of Rs 10 per 100 cm^2.
[Use--- 3.14]
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Reema Narula
added on Fri Feb 20 10:30:14 UTC 2015 239 views

Question - In Figure 3, two concentric circles with centre 0, have radii 21cm and 42 em.
If --- AOB = 60°, find the area of the shaded region. [Use ------]
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Reema Narula
added on Fri Feb 20 11:02:33 UTC 2015 226 views

Question - In Figure 1, common tangents AB and CD to the two circles with centres 0_1and 0_2 intersect at E. Prove that AB = CD. ------
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Reema Narula
added on Fri Feb 20 10:25:01 UTC 2015 225 views

Question - Solve for x: -------
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Purnima Lodha
added on Fri Feb 20 11:59:24 UTC 2015 223 views

Question - The sum of first n terms of an AP is 3n^2 + 4n. Find the 25th term of this AP.
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Reema Narula
added on Fri Feb 20 11:01:54 UTC 2015 223 views

Question - A container open at the top, is in the form of a frustum of a cone of height 24 cm with radii of its lower and upper circular ends, as 8 cm and 20 cm respectively. Find the cost of milk which can completely fill the container. at the rate of 21 per litre. [Use ------]
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Reema Narula
added on Fri Feb 20 10:27:33 UTC 2015 223 views

Question - The incircle of an isosceles triangle ABC, in which AB = AC, touches the sides BC, CA and AB at D, E and F respectively. Prove that BD = DC.
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