Question
A rectangular piece of copper foil of length 35 cm and
area 770 cm2 is folded along its width to form a cylinder such that there is only one layer of copper foil on any part of the cylinder. What is the volume (in cm3) of the cylinder so formed?Solution
Width of the rectangular piece of copper foil = 770/35 = 22 cm Since the foil is folded along its width to form a cylinder without any double layer, circumference of the cylinder formed = width of the rectangular foil Also, height of the cylinder so formed = length of the rectangular copper foil So, 2 × π × radius = 22 Radius of cylinder = 22 ÷ (2 × 22/7) = (22/44) × 7 = 3.5 cm So, volume of the cylinder so formed = π × (radius)2 × height = (22/7) × 3.5 × 3.5 × 21 = 1347.5 cm³
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...
Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at varianc...
Statements: Some racks are tables.
Some tables are chairs.
No chair is a book.
Conclusions: I. Some racks are chairs.
<...Statement:
All Mathematics are Economics
Only a few Mathematics are Chemistry
No Chemistry is Physics
Conclusion:
I. ...
Statements:
All Sheep are Peacock.
 All Peacock are Deer.
 Mostly Sheep are Hen.
 Conclusion:
I. Few...
Statements:
Only a few hands are ears
Some ears are eyes
All eyes are arms
Conclusions:
I. No arm is a hand
II...
Statements:
Some tigers are dog
Only a few dogs are cats
All cats are lions
Only a few lions are horses
Conclusion...
Statements:
Only potato are tomato
Some potato are brinjal
Only brinjal are radish
Conclusion:
I. Some tomato are rad...
Statements: Hands # Leg Arms % Leg Ear & Leg Eyes # Ear
Conclusions:
I. Hands % Arms
II. Eyes ≤ Ear
III. Arms $ Ear
IV. Eyes & Hands
In the question below there are three statements followed by two conclusions I and II. You have to take the three given statements to be true even if t...
