Aptitude - Squares & Cubes Online Quiz


Advertisements


Following quiz provides Multiple Choice Questions (MCQs) related to Squares & Cubes. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the quiz.

Questions and Answers

Q 1 - √2500 +√961 = (?)2

A - 81

B - 3

C - 6561

D - 9

Answer : D

Explanation

Let √(√2500+√961) =x2. Then
x2= √(50+31) = √81= 9. ∴ x = √9 = 3

Q 2 - 176 + √2401 = ?

A - 14

B - 15

C - 18

D - 24

Answer : B

Explanation

√176 +√2401 =√(176+49) =√225 =15

Q 3 - (1.21* 0.9)/(1.1 * 0.11)=?

A - 2

B - 3

C - 9

D - 11

Answer : B

Explanation

Sum of decimel places in the numerator= sum of decimel places in the denominator.
∴ √121*9/11*11= √9 =3.

Q 4 - √(0.28900/ 0.00121) = ?

A - 17/110

B - 170/11

C - 17/11

D - none of these

Answer : B

Explanation

√0.28900/ 0.00121 = √28900/121 = 170/11

Q 5 - √0.000441 =?

A - 0.00021

B - 0.0021

C - 0.021

D - 0.21

Answer : C

Explanation

given Expression = √441/1000000 = 21/1000 =0.021

Q 6 - if √ 1+ x/144 = 13/12, then the value of x is :

A - 0

B - 12

C - 13

D - 25

Answer : D

Explanation

√1+x/144 = 13/12   ⇒ (1+x/144)⇒ (13/12)2= 169/144
⇒  x/144=(169/144-1)= (169-144)/144 = 25/144  ⇒ x=25

Q 7 - if (√(x+1) +√(x-1))/(√(x+1) - √(x-1)) = 3 , what is x?

A - 3/5

B - 4/5

C - 5/3

D - 3

Answer : C

Explanation

√x+1 +√x-1/√x+1=√x-1= 3 ⇒  (√x+1 +√x-1)/(√x+1*√x+1 +√x-1/√x+1=√x-1= 3
⇒ ((√x+1 +√x-1)2 /(x+1)-(x-1) = [(x+1+x-1)+2√x+1. √X-1]/2 =3
⇒2(x+√ x2-1)/2 =3  ⇒ x+√x2-1 =3
⇒  √x2-1=(3-x) ⇒ (x2-1)=(3-x)2 =(9+x2-6x)
⇒  6x-10=0  ⇒ 6x=10  ⇒ x= 10/6  =5/3

Q 8 - if 1120/ √ p =80 ,Then p =?

A - 14

B - 140

C - 196

D - 225

Answer : C

Explanation

1120/ √p= 80 ⇒ √p =1120/80 =14 ⇒ P=(14*14) = 196

Q 9 - (√7+ √5 )/(√7-√5) = ?

A - 1

B - 6+√35

C - 2

D - 6-√35

Answer : B

Explanation

(√7+√5/√7-√5)= (√7+√5/√7-√5)* (√7+√5/√7+√5)
=((√7+√5)2/(7-5)  = 7+5+2√35/2= 12+2√35/2  =6+√35

Q 10 - √0.4 =?

A - 0.2

B - 0.02

C - 2

D - 0.632

Answer : D

Explanation

√0.4 = √ 0.632 * 0.632 = 0.632


aptitude_squares_cubes.htm

Advertisements