31
Q:

# Two cubes have their volumes in the ratio 1 : 27. Find the ratio of their surface areas.

 A) 2:9 B) 3:9 C) 1:9 D) 4:9

Explanation:

Let their edges be a and b. Then,

a3/b3 = 1/27 (or) (a/b)3 = (1/3)3 (or) (a/b) = (1/3).

\Ratio of their surface area = 6a2/6b2 = a2/b2 = (a/b)2 = 1/9, i.e. 1:9.

Q:

If sqrt x + frac{1}{sqrt x} = 2sqrt2, then x^2 + frac{1}{x^2} is equal to:

 A) 36 B) 34 C) 32 D) 64

Explanation:

2 42
Q:

If 'J' is coded as '20' and 'BAT” is coded as '46' then how will 'CRICKET' be coded?

 A) 138 B) 158 C) 142 D) 140

Explanation:

1 150
Q:

What is the value of x so that the seven digit number 8439x53 is divisible by 99?

 A) 9 B) 4 C) 3 D) 6

Explanation:

0 542
Q:

△ABC ∼ △NLM and ar(△ABC): ar(△NLM) = 4 : 9. If AB = 6 cm, BC = 8 cm and AC =12 cm, then ML is equal to:

 A) 18 cm B) 9 cm C) 6 cm D) 12 cm

Answer & Explanation Answer: D) 12 cm

Explanation:

0 432
Q:

If (5a - 3b) : (4a - 2b) = 2 : 3, then a : b is equal to:

 A) 3 : 4 B) 2 : 3 C) 5 : 8 D) 5 : 7

Answer & Explanation Answer: D) 5 : 7

Explanation:

1 404
Q:

What is the value of x so that the seven digit number 55350x2 is divisible by 72?

 A) 1 B) 8 C) 7 D) 3

Explanation:

0 482
Q:

Walking frac{5}{7} of his usual speed, a person reaches his office 10 minutes later than the usual time. His usual time in minutes is:

 A) 28 B) 30 C) 25 D) 35

Explanation:

0 94
Q:

If a + b + c = 8 and ab + bc + ca = 20, then a^3 + b^3 + c^3 - 3abc is equal to:

 A) 30 B) 24 C) 32 D) 36