#### If the dimensions of a rectangular room are 10m × 12m × 9m, then the cost of painting its four walls at the rate of ₹8 per m^{2} is

(a) ₹3186

(b) ₹3618

(c) ₹3168

(d) none of these

**Solution:**

#### Volume of a cylinder is 1848 cm^{2}. If the diameter of its base is 14 cm, then the height of the cylinder is

(a) 12 cm

(b) 6 cm

(c) 3 cm

(d) none of these

**Solution:**

#### If the radius of a cylinder is doubled and height is halved, then new volume is

(a) same

(b) 2 times

(c) 4 times

(d) 8 times

**Solution:**

**More Solutions:**

- The volume of a cube is 343 cm3, find the length of an edge of cube.
- If each edge of a cube is tripled, then find how many times will its volume become?
- A closed box is made of 2 cm thick wood with external dimension 84 cm × 75 cm × 64 cm.
- The radius of the base of a right circular cylinder is halved and the height is doubled
- Water flows through a cylindrical pipe of internal diameter 7 cm at 5 m per sec.
- Two cylindrical vessels are filled with milk. The radius of one vessel is 15 cm
- A wooden pole is 7 m high and 20 cm in diameter. Find its weight