logo

CuriousTab

CuriousTab

Discussion


Home Aptitude Area Comments

  • Question
  • An error 2% in excess is made while measuring the side of a square. The percentage of error in the calculated area of the square is:


  • Options
  • A. 1.04
  • B. 2.04
  • C. 3.04
  • D. 4.04

  • Correct Answer
  • 4.04 

    Explanation

    100 cm is read as 102 cm. 

    A1 = (100*100)Sq.cm 

    A2 = (102*102)Sq.cm

    (A2 - A1) = 102 2 - 100 2  = (102 + 100) x (102 - 100) = 404 sq.cm.


  • Area problems


    Search Results


    • 1. The length of a rectangle is halved, while its breadth is tripled. What is the percentage change in area?

    • Options
    • A. 20%
    • B. 30%
    • C. 40%
    • D. 50%
    • Discuss
    • 2. The length of a class room floor exceeds its breadth by 25 m. The area of the floor remains unchanged when the length is decreased by 10 m but the breadth is increased by 8 m. The area of the floor is

    • Options
    • A. 5100 sq.m
    • B. 4870 sq.m
    • C. 4987 sq.m
    • D. 4442 sq.m
    • Discuss
    • 3. Find the area of a triangle whose sides measure 13 cm, 14 cm and 15 cm.

    • Options
    • A. 84
    • B. 64
    • C. 44
    • D. 22
    • Discuss
    • 4. A room of 5m 44cm long and 3m 74cm broad is to be paved with squre tiles. Find the least number of squre tiles required to cover the floor.

    • Options
    • A. 136
    • B. 146
    • C. 166
    • D. 176
    • Discuss
    • 5. The diameter of the driving wheel of a bus is 140 cm. How many revolution, per minute must the wheel make in order to keep a speed of 66 kmph ?

    • Options
    • A. 150
    • B. 250
    • C. 350
    • D. 550
    • Discuss
    • 6. Three circles of radius 3.5cm are placed in such a way that each circle touches the other two. The area of the portion enclosed by the circles is

    • Options
    • A. 1.967
    • B. 1.867
    • C. 1.767
    • D. 1.567
    • Discuss
    • 7. The ratio between the length and breadth of a rectangular field is 5 : 4 if the breadth is 20m less than the length, the perimeter of the field is :

    • Options
    • A. 260m
    • B. 280m
    • C. 360m
    • D. none of these
    • Discuss
    • 8. The dimensions of a room are 10m x 7m x 5m. There are 2 doors and 3 windows in the room. The dimensions of the doors are 1m x 3m. One window is of size 2m x 1.5m and the other 2 windows are of size 1m x 1.5m. The cost of painting the walls at Rs. 3 per sq m is

    • Options
    • A. Rs.174
    • B. Rs.274
    • C. Rs.374
    • D. Rs.474
    • Discuss
    • 9. Area of a square and a rectangle are equal. If side of the square is 40 cm and length of the rectangle is 64 cm, what is the perimeter of the rectangle ?

    • Options
    • A. 187 cm
    • B. 178 cm
    • C. 149 cm
    • D. 194 cm
    • Discuss
    • 10. The area of a square is equal to the area of a rectangle. The length of the rectangle is 5 cm more than a side of the square and its breadth is 3 cm less than the side of the square. What is the perimeter of the rectangle ?

    • Options
    • A. 15 cm
    • B. 18 cm
    • C. 34 cm
    • D. 26 cm
    • Discuss


    Comments

    There are no comments.

Enter a new Comment