Test of Chapter: 13. Class: 9. Time: 40 min
Q.1: The length, breadth and height of a room are 5 m, 4 m and 3 m respectively. Find the cost of whitewashing the walls of the room and the ceiling at the rate of Rs.7.50 per sq.m.
Q.2: The curved surface area of a right circular cylinder of height 14 cm is 88 cm. sq. Find the diameter of the base of the cylinder.
Q.3: In a hot water heating system, there is a cylindrical pipe of length 28 m and diameter 5 cm. Find the total radiating surface in the system.
Q.4: The height of a cone is 16 cm and its base radius is 12 cm. Find the curved surface area and the total surface area of the cone.
Q.6: The slant height and base diameter of a conical tomb are 25 m and 14 m respectively. Find the cost of white-washing its curved surface at the rate of Rs.210 per 100 sq.m.
Q.7: The hollow sphere, in which the circus motorcyclist performs his stunts, has a diameter of 7 m. Find the area available to the motorcyclist for riding.