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Total Questions : 2556 | Page 9 of 256 pages
Question 81.

A tank is 25 m long, 12 m wide and 6 m deep. The cost of plastering its walls and bottom at 75 paise per sq. m, is:

  1.    Rs 456
  2.    Rs 458
  3.    Rs 558
  4.    Rs 468
  5.    None of these
 Discuss Question
Answer: Option C. -> Rs 558
 -   Area to be plastered = [2(l + b) x h] + (l x b)
  = {[2(25 + 12) x 6] + (25 x 12)} m2
  = (444 + 300) m2
  = 744 m2.  Cost of plastering = Rs.   744 x 75   = Rs. 558. 100  
Question 82.  a cistern 6 m long and 4 m wide contains water up to a breadth of 1 m 25 cm. find the total area of the wet surface.
  1.    41 m square
  2.    44 m square
  3.    46 m square
  4.    49 m square
 Discuss Question
Answer: Option D. -> 49 m square
Explanation :
Question 83.  the diagonal of the floor of a rectangular closet is 7 1/2 feet. the shorter side of the closet is 4 1/2 feet. what is the area of the closet in square feet ?
  1.    26 sq. ft
  2.    27 sq. ft
  3.    28 sq. ft
  4.    29 sq. ft
 Discuss Question
Answer: Option B. -> 27 sq. ft
Explanation :
Question 84.  find the circumference and area of radius 7 cm.
  1.    154 cm² 
  2.    157 cm² 
  3.    163 cm² 
  4.    167 cm² 
 Discuss Question
Answer: Option A. -> 154 cm² 
Explanation :
Question 85.  the ratio of areas of two wheels is 25 : 49. find the ratio of their radii.
  1.    5 : 7
  2.    4 : 9
  3.    3 : 2
  4.    2 : 7
 Discuss Question
Answer: Option A. -> 5 : 7
Explanation :
Question 86.  a piece of wire in the form of rectangle 40 cm long and 26 cm wide is again bent to form a circle. find the radius of the circle.
  1.    18 cm
  2.    19 cm
  3.    20 cm
  4.    21 cm
 Discuss Question
Answer: Option D. -> 21 cm
Explanation :
Question 87.  the length of a rectangle is 12 cm and its width is 5 cm smaller. the area of the rectangle is
  1.    84 cm²
  2.    87 cm²
  3.    91 cm²
  4.    96 cm²
 Discuss Question
Answer: Option A. -> 84 cm²
Explanation :
Question 88.  a rectangle has the length of 12 cm and the width 3 times smaller. its area is-
  1.    42 cm²
  2.    48 cm²
  3.    53 cm²
  4.    57 cm²
 Discuss Question
Answer: Option B. -> 48 cm²
Explanation :
Question 89.  rectangle abcd has a length of 8 cm and a width of 6 cm. what is the total area of the blue rectangles?
  1.    1 cm²
  2.    2 cm²
  3.    3 cm²
  4.    4 cm²
 Discuss Question
Answer: Option C. -> 3 cm²
Explanation :
Question 90.  find the area of a parallelogram with a base of 12 centimeters and a height of 5 centimeters.
  1.    10 cm²
  2.    20 cm²
  3.    40 cm²
  4.    60 cm²
 Discuss Question
Answer: Option D. -> 60 cm²
Explanation :

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