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:

Solve the below equation.

 A) 94 B) 65 C) 214 D) 215

Explanation:

0 29
Q:

Which of the following is an example of a metal that needs to be stored under oil?

 A) Potassium B) Gold C) Iron D) Silver

Explanation:

0 39
Q:

Pabitra had$1927$ l of petrol in the fuel tank of his vehicle at the start of a journey. During the journey,$1312$ l of petrol was consumed. What fraction of the initial petrol was left in the fuel tank after the journey?

 A) 710 B) 35 C) 310 D) 1140

Explanation:

0 30
Q:

If A lies in third quadrant, and $20tanA=2120 tan A = 21$, then the value of $5sinA-2cosA4cosA-57sinAfrac{5 sin A - 2 cos A}{4 cos A - frac{5}{7} sin A}$

 A) -6529\frac{-65}{29} B) 15\frac{1}{5} C) 529\frac{5}{29} D) 1312\frac{13}{12}

Explanation:

2 44
Q:

The sum of the squares of 3 natural numbers is 1029, and they are in the proportion 1 : 2 : 4. The difference between greatest number and smallest number is:

 A) 15 B) 21 C) 31 D) 18

Explanation:

0 69
Q:

Two circles of radii 8 cm and 6 cm touch each other externally. The length of the direct common tangent is:

 A) 13.86 B) 20 C) 10.12 D) 24

Explanation:

0 80
Q:

Which of the following physical quantities has no unit?

 A) Momentum B) Density C) Pressure D) Relative density

Explanation:

0 556
Q:

Satya Pal Malik was appointed as the governor of ....... by President Ram Nath Kovind.

 A) Chhattisgarh B) Bihar C) Odisha D) Jharkhand