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Surface Areas and Volumes Test - 5

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Surface Areas and Volumes Test - 5
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  • Question 1
    1 / -0

    The cost of painting a cubical box of side 3m at the rate of Rs.2 per sq.m is

    Solution

    Given: Side of the cube (a)(a) = 3 m
    ∴ Surface Area of Cube = 6a2 = 6 × 3 × 3 = 54 sq. cm
    Now, Cost of painting the cubical box of 1 sq. m = Rs. 2
    ∴ Cost of painting the cubical box of 54 sq. m = 54 × 2 = Rs. 10

  • Question 2
    1 / -0

    The curved surface area of a right circular cylinder of radius 1cm and height 1cm is

    Solution

    Curved surface area of cylinder = 2πrh

    = 2π×1×1

    = 2π cm2

  • Question 3
    1 / -0

    The CSA of a right circular cylinder whose base radius is ‘x’ units and height is ‘z’ units is

    Solution

    Since, CSA of a right circular cylinder = 2πrh

    Therefore, according to the question,

    CSA of a right circular cylinder = 2πxz sq. units

  • Question 4
    1 / -0

    If the radius of the sphere is 2cm, then its curved surface area is

    Solution

    Since, CSA of a right circular cylinder = 2πrh

    Therefore, according to the question,

    CSA of a right circular cylinder = 2πxz sq. units

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