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A hall is 12m long and 8m broad. If the sum of the area of the floor and the ceiling is equal to the sum of the area of the four walls. Find the height of the hall (in m) |
| A) 4.8
B) 6.4
C) 8.3
D) 3.2
Correct Answer : 4.8 Explanation : Area of 4 walls of a room = (l*h)+(b*h)+(l*h)+(b*h) =2(l*h)+2(b*h) = 2h(l+b) We have, |
If each side of a cube is 3 centimeter,then its surface area is : |
| A) 54 Cubic Centimeter B) 9 Square Centimeter C) 54 Square Centimeter D) None of these Correct Answer : 54 Square Centimeter Explanation : if side of the square as “a”, then |
A 5 cm cube is cut into as many 1 cm cubes as possible. What is the ratio of the surface area of the larger cube to the smaller cubes? |
| A) 1/6 B) 1/5 C) 1/25 D) 1/125 Correct Answer : 1/5 Explanation : The volume of the original cube = 53 = 125 cm3. |
If the surface area of sphere is 346.5 cm2, then its radius is [ taking π=22/7 ]? |
| A) 5.25 cm B) 7.25 cm C) 3.25 cm D) 9.25 cm Correct Answer : 5.25 cm Explanation : Surface area of sphere= 4πr2 |
If cost of painting is Rs 12 per sq meter of surface area, how much will it cost to paint all surfaces of a solid right circular cylinder with height of 9 meters and base area of 154 sq meters? |
| A) Rs. 8448 B) Rs. 9372 C) Rs. 1540 D) Rs. 3180 Correct Answer : Rs. 8448 Explanation : Base area of cylinder = πr2 = 154 Then, Total Surface Area of cylinder = 2πr(h + r) = 2π*7*(9 + 7) Hence, Cost of painting = 12 * 704 |
If the volume of a cylinder is 2156 cubic cm and height is 14 cm, find its radius? |
| A) 14 cm B) 21 cm C) 3.5 cm D) 7 cm Correct Answer : 7 cm Explanation : h = 14 cm, r = ? |