Mensuration Model Questions Set 1 Section-Wise Topic Notes With Detailed Explanation And Example Questions
MOST IMPORTANT quantitative aptitude - 2 EXERCISES
The following question based on Mensuration topic of quantitative aptitude
(a) ($2n^2$ , 2n, 2n + 1)
(b) (2n + 1, 4n, $2n^2$ + 2n)
(c) (2n, 4n, $n^2$ + 1)
(d) (2n, $n^2$ – 1, $n^2$ + 1) Where, n is a positive real number.
The correct answers to the above question in:
Answer: (d)
According to Pythagorean triplet.
The sum of square of base and perpendicular equal to square of hypotenuse.
By hit and trial method:—
$(2n)^2 + (n^2 – 1)^2 = (n^2 + 1)^2$
$4n^2 + n^4 + 1 – 2n^2 = n^4 + 2n^2$ + 1
$n^4 + 2n^2 + 1 = n^4 + 2n^2$ + 1
LHS = RHS
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Read more model questions set 1 Based Quantitative Aptitude Questions and Answers
Question : 1
A circle of radius r is inscribed in a regular polygon with n sides (the circle touches all sides of the polygon). If the perimeter of the polygon is p, then the area of the polygon is
a) ${pr}/2$
b) (p + n) r
c) (2p – n) r
d) None of the above
Answer »Answer: (a)
The n-sided polygon can be dinded into 'n' triangle with O, the Centre of the circle as one vertex for each triangle. The altitude of each triangle is r. Let the sides of the polygon be '$a_1 ', a_2 ----- a_n$.(Given $a_1 = a_2 = ------ a_n$)
∴ The area of polygon is ${nr}/2 = {pr}/2$
Area of polygon = ${a_1r}/2 + {a_2r}/2 + --- {a_nr}/2 = {pr}/2$
So, option (a) is correct.
Question : 2
A boy has 3 library cards and 8 books of his interest in the library. Of these 8, he does not want to borrow chemistry part II unless Chemistry part I is also borrowed. In how many ways can he choose the three books to be borrowed ?
a) 26
b) 27
c) 41
d) 56
e) None of these
Answer »Answer: (c)
Two possibilities are there :
(i) Chemistry part I is available in 8 books with Chemistry part II.
or
(ii) Chemistry part II is not available in 8 books but Chemistry part I is available.
Total No. of ways = 1× 1 ×$^6C_1 + ^7C_3$ = 6 + ${7 × 6 × 5}/{3 × 2}$ = 6 + 35 = 41
Question : 3
In how many different ways can be letters of the word 'CYCLE' be arranged?
a) 30
b) 4240
c) 80
d) 120
e) None of these
Answer »Answer: (e)
CYCLE whereas C comes two times.
So, arrangements are = ${5!}/{2!}$ = ${5 × 4 × 3 × 2}/{2}$ = 60 ways
Question : 4
If area of a circle and a square are same, then what is the ratio of their perimeters ?
a) $√π/2$
b) 2 $√π$
c) $√π$
d) $√π/4$
Answer »Answer: (a)
Let radius of cirlce is ‘r’ and side of the square is a ∼ then, from question
$π r^2 = a^2 ⇒ r/a = 1/√π$
Now ∼ ${2πr}/{4a} = {2π}/{4√π} = √π/2$
Question : 5
If the length of the hypotenuse of a right angled triangle is 10 cm, then what is the maximum area of such a right angled triangle ?
a) 25 cm$^2$
b) 100 cm$^2$
c) 50 cm$^2$
d) 10 cm$^2$
Answer »Answer: (a)
Area will be maximum when P and B will be same
So $P^2 + P^2 = H^2 ⇒ P^2 = H^2/2$
⇒ P = $H/√2$
Area = $1/2 BP = 1/2 P^2 = 1/2. H^2/2 = H^2/4$
= ${100}/4 = 25 cm^2$
Question : 6
The hypotenuse of a right triangle is 3$√10$ unit. If the smaller side is tripled and the longer side is doubled, new hypotenuse becomes 9$√5$ unit. What are the lengths of the smaller and longer sides of the right triangle, respectively?
a) 3 and 9 units
b) 5 and 9 units
c) 5 and 6 units
d) 3 and 6 units
Answer »Answer: (a)
Suppose the smaller and larger sides of a right triangle be x and y, respectively.
By given condition,
$x^2 + y^2 = (3 √{10})^2$
⇒ $x^2 + y^2$ = 90 ... (i)
and $9x^2 + 4y^2$ = 405 ... (ii)
On solving Eqs. (i) and (ii), we get
x = 3 units and y = 9 units
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