A copper wire is bent in the form of an equilateral triangle and has area 121√3 cm2. If the same wire is bent into the form of a circle, the area (in cm2) enclosed by the wire is \(\left( {Take\;\pi = \frac{{22}}{7}} \right)\)
1). 364.5
2). 693.5
3). 346.5
4). 639.5
If a cylinder of radius 4.3 cm and height 4.8 cm is melted and constructed into a cone of the same radius, what will be the height of this cone? (Use π = 22/7)
1). 28.8 cm
2). 14.4 cm
3). 7.2 cm
4). 21.6 cm
The cross - section of a canal is in the shape of an isosceles trapezium which is 3 m wide at the bottom and 5 m wide at the top. If the depth of the canal is 2 m and it is 110 m long, what is the maximum capacity of this canal? (Take π = 22/7)
1). 1760 cubic metres
2). 1650 cubic metres
3). 1056 cubic metres
4). 880 cubic metres
The size of a wooden block is 10 × 20 × 30 m3. How many such blocks will be required to construct a solid wooden cube of minimum size?
The length and breadth of a rectangular field are increased by 15% and 10% respectively. What will be the effect on its area?
1). 26.5% increase
2). 28.5% increase
3). 21.5% increase
4). 26.5% decrease