Question
A solid cylinder has the total surface area 231 sq.cm.
If its curved surface area is of the total surface area, then the volume of the cylinder isSolution
Total surface area = 231 cm2 Curved surface area = 2/3 x 231 = 154 cm2 Curved surface area of cylinder = 2πrh ⇒ 2πrh = 154 ⇒ 2 × (22/7) × r × h = 154 ⇒ r × l = 24.5 Total surface area of cylinder = 2πr(r + h) ⇒ 2πr(r + h) = 231 ⇒ r(r + h) = 36.75 ⇒ r2 + rh = 36.75 ⇒ r2 = 36.75 - 24.5 ⇒ r2 = 12.25 ⇒ r = 3.5 cm Volume of cylinder = πr2h ⇒ π × r × (r × h) ⇒ π × 3.5 × 24.5 ⇒ 269.5 cm ∴ The volume of the cylinder is 269.5 cm3 .
In a certain code language, ‘let it go’ is coded as ‘vc nt ap’ and ‘this is it’ is coded as ‘mq vc lh’. What is the code for ‘it’ in...
How many squares are there in the given figure?
Identify the figure that completes the given pattern.
1.Â
In the following question, select the missing number from the given series.
12, 24, 72, 288, 1440, ?
Exam of each of P, Q, R, S, T, U and V is on a different day of a week starting from Monday and ending on Sunday. P's exam is on Tuesday. Q's exam is on...
Statements:
Some elephants are fishes.
No fish is a tiger.
All deer are tigers.
Conclusions:
I. Some elephants ar...
Select the set in which the number are related in the same way as the numbers of the given sets. (NOTE : Operations should be performed on the whole num...
Select the option that is related to the fifth term in the same way as the second term is related to the first term and the fourth term is related to t...
In the given diagram, Circle represent Water, Rectangle represent Wheat and Square represent Rice. Find the number of rice which are not water..
...
Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance...
