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The total surface area of a frustum-shap...

The total surface area of a frustum-shaped glass nuber is `(r_(1)gtr_(2))`

A

`pir_(1)l +pi r_(2)l`

B

`pi l (r _(1) + r_(2)) +pir _(2)^(2)`

C

`1/3 pih r _(1)^(2) +r_(2)^(2)+r_(1)r_(2)`

D

`sqrt(h^(2) +(r_(1)-r_(2)^(2))`

Text Solution

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X BOARD PREVIOUS YEAR PAPER ENGLISH-CBSE BOARDS 2020-QUESTION
  1. The total surface area of a frustum-shaped glass nuber is (r(1)gtr(2))

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  2. The value(s) of k for which the quadratic equation 2x^2 + kx + 2 = 0 ...

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  3. Which of the following in not an A .P .?

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  4. In figure, From an external point P, Two tangents PQ and PR are...

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  5. The distance between the points (m,-n) and (-m,n) is (A) sqrt(m^2 + ...

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  6. A quadratic polynomial, whose zeroes are -3 and 4, is

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  7. In figure ABC is an isosceles triangle , right angled at C . Th...

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  8. The point on the axis which is equidistant from (-4,0) and (10,0) is ,...

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  9. The centre of a circle whose end points of a diameter are (-6,3) and (...

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  10. The pair of linear equations (3x)/(2)+(5y)/(3)=7 and 9x+10y=14 is

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  11. In figure PQ is tangent to the circle with centre at O at the ...

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  12. The radius of a sphere (in cm) whose volume is 12pi cm^3, is (A) 3 ...

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  13. Can (x^2 - 1) be a remainder while dividing x^4 - 3x^2 + 5x -9 by x^2 ...

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  14. Find the sum of the first 100 natural numbers.

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  15. Evaluate : 2 sec 30^(@) xx tan 60^(@)

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  16. The angle elevation of the top of a tower from a point C on the ground...

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  17. In Figure, a quadrilateral ABCD is drawn to circumscribe a circle . ...

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  18. Find the perimeter of DeltaABC, if AP=12 cm

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  19. How many cubes of side 2 cm can be made from a solid cube of side 10 c...

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  20. In the given figure, DE||AC and DF||AE. Prove that (BF)/(FE)=(BE)/(E...

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  21. Show that 5+2sqrt(7) is an irrational number, where sqrt(7) is given t...

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