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MENSURATION PDF
1.A room 24cm long and 32cm broad is to be
paved with equal no of tiles. Find the no of largest
tiles requires so that the tiles exactly fit.
A.15
B.12
C.17
D.19
E.None of these
2.A circular garden has a path of uniform width
around it. The difference between outer and inner
circumference of the circular path is 210cm.Find
its width.
A.33.44cm
B.30.34cm
C.40.24cm
D.28.64cm
E.None of these
3.The length of a rectangular plot is 3 folds its
width. Half the area of the plot is covered by a
playground whose area is 363 square meters.
What is the length of the plot?
A.18.50m
B.13.61m
C.17.21m
D.15.51m
E.None of these
4.A rectangular field has its length and breadth in
the ratio 6:5 respectively. A man riding bicycle
complete one lap of this field along its perimeter
at the speed of 12kmph in 1.5m. What is the area
of the field?
A.5345
B.5487
C.5468
D.5460
E.None of these
5.One of the angles of a parallelogram is
65degree. What will be the sum of twice the
largest angle and thrice the smallest angle of the
parallelogram?
A.460degree
B.375degree
C.235degree
D.425degree
E.None of these
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6.The area of the square is three-fifth the area of
a rectangle. The length of the rectangle is 25cm
and breadth 10cm less than its length. What is the
area of the square?
A.20cm
B.12cm
C.15cm
D.17cm
E.None of these
7.What will be the cost of painting a hall whose
area is 256sq m, if the rate of painting per sq m is
Rs.22.
A.Rs.1256
B.Rs.1350
C.Rs.2225
D.Can’t be determined
E.None of these
8.The width of a rectangle is 10 meter and its area
are 120 square meters. If length of the rectangle
is increased by 6. What is the new perimeter of
the rectangle?
A.65
B.43
C.56
D.32
E.None of these
9.If the sides of a triangle measure 62cm, 70cm
and 18cm, what is the measure of its in radius?
A.7cm
B.6cm
C.4cm
D.9cm
E.None of these
10.Four horses are tethered at 4 corners of a
square field of side 60 metres so that they just
cannot reach one another. The area left ungrazed
by the horses is:
A.841m
B.771m
C.612m
D.523m
E.None of these
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11.The length and the breadth of a rectangular
door are increased by 1 m each and due to this
the area of the door increased by 21 sq. m. But if
the length is increased by 1 m and breadth
decreased by 1 m, area is decreased by 5 sq. m.
Find the perimeter of the door.
A) 25 m
B) 20 m
C) 40 m
D) 60 m
E) 24 m
12.The perimeter of a rectangular plot is 340 m.
Find the cost of gardening 1 m broad boundary
around it at the rate of Rs 10 per sq. m.
A) Rs 3450
B) Rs 3400
C) Rs 3480
D) Rs 3440
E) Rs 3880
13.The sides of a triangle are in the ratio 3: 4: 5
whose area is 216 sq. cm. What will be the
perimeter of this triangle?
A) 58 cm
B) 64 cm
C) 28 cm
D) 36 cm
E) 72 cm
14.If the base of a triangle is increased by 50%
and its height is decreased by 50%, then what
will be the effect on its area?
A) 50% decrease
B) 75% increase
C) No effect
D) 25% decrease
E) 25% increase
15.A rectangle whose sides are in the ratio 6: 5 is
formed by bending a circular wire of radius 42 cm.
Find the largest side of the rectangle.
A) 60 cm
B) 72 cm
C) 66 cm
D) 78 cm
E) 84 cm
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Answer – B.12
Explanation:
HCF of 24,32 = 8
No of tiles = L *B/(HCF)2
= 24*32/8*8 = 12
Answer – A.33.44cm
Explanation:
2*3.14*R – 2*3.14*r = 210
R-r = 210/2*3.14 = 33.44cm
Answer – D.15.51m
Explanation:
X * 3X = 320*2
3x 2 = 363*2
x 2 = 363*2/3 = 121*2
x = 11*1.41 = 15.51
Answer – C.5468
Explanation:
Speed = 12*5/18 = 3.3 m/s
Perimeter = Distance
2(6x+5x) = 90*3.3
22x= 297
X=13.5
Area = 6*13.5 *5*13.5 = 5467.5 = 5468sq.m
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Answer – D.425degree
Explanation:
180-65 = 115
2*115+ 3*65 = 230+195 = 425
Answer – C.15cm
Explantion:
Area of rectangle = 25*15 = 375sq.cm
Area of square = 3*375/5 = 225sq.cm = a*a
Side of the square = a = 15cm
Answer – Can’t be determined
Explanation:
Hall shape and its parameter was not given
Answer – C.56
Explanation:
Length = 120/10 = 12
(12+6) = 18
Perimeter = 2(10+18) = 56
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Answer – A.7cm
Explanation:
Radius = product of perpendicular side/ perimeter of
traingle
R = 62*18/62+70+18 = 1116/150 = 7.44 = 7cm
Answer – B.771m
Explanation:
Length of the rope = 60/2 = 30m
Total area covered by 4 horse = 22*30*30/7
Ungrazed area = Area of Square field – area covered by
4 horse
= 3600 – 2829 = 771m
C) 40 m
Explanation:
Let original length = l, breadth = b, so area = lb
When l and b increased by 1:
(l+1)(b+1) = lb + 21
Solve, l + b = 20
When l increased by 1, b decreased by 1:
(l+1)(b-1) = lb – 5
Solve, l – b = 6
Now solve both equations, l = 13, b = 7
Perimeter = 2(13+7)
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D) Rs 3440
Explanation:
Given 2(l+b) = 340
1 m broad boundary means increase in l and b by 2 m
So area of the boundary will be [(l+2)(b+2) – lb] =
2(l+b) + 4 = 340 + 4 = 344
So cost of gardening = 344*10
E) 72 cm
Explanation:
Sides 3x, 4x, 5x
So semi-perimeter, s = (3x+4x+5x)/2 = 6x
Area = √s(s-a)(s-b)(s-c)
= √6x*3x*2x*x = 6x2 cm2
So 6x2 = 216, this gives x = 6
Perimeter = 12x = 12*6
D) 25% decrease
Explanation:
Area of triangle = (1/2) * base * height
So effect on area = +50 + (-50) + (50) (-50)/100 = -
25%
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B) 72 cm
Explanation:
Length of wire = 2ᴨr = 264 which should be equal to
the perimeter of rectangle in which it is bent.
So 2(6x + 5x) = 264
Solve, x= 12
Largest side = 6x = 6*12
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MENSURATION