Question
A rectangular piece of copper foil of length 21 cm and
area 924 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 = 924/21 = 44 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 = 44 Radius of cylinder = 44 ÷ (2 × 22/7) = (44/44) × 7 = 7 cm So, volume of the cylinder so formed = π × (radius)2 × height = (22/7) × 7 × 7 × 21 = 3234 cm³
Which among the following is a device, that is used in computers to add external components?
A program that performs a useful task while simultaneously allowing destructive acts is
A device is used to read information encoded into a small plastic cards.
Which of the following refers to the temporary storage location used for cut, copy and paste?
Times new Roman, Cambria, Arial are the examples of __________.
Which of the following terms is associated with the computers processing speed?
Which output device transfers processed information into a printed page?
What is the full form of SMPS?
A file which has not been altered, compressed, or manipulated in any way by the computer is called?
Which of the following is considered as the volatile memory?Â
