Important class 9 maths questions for Chapter 13 Surface Areas and Volumes are given here for students who are preparing for their final exams 2020. The questions are based on CBSE 2019-20 syllabus and relevant to NCERT book for 9th standard, prepared by our subject experts. Practising these questions will help students to score well.
Students can do the revision here by accessing the important questions for Class IX Maths of all the chapters here at BYJU’S. Also, we have made available extra questions based on surface area and volume concept to practice better.
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Important Surface Areas and Volumes Questions For Class 9 (Chapter 13)
Q.1: Hameed has built a cubical water tank with lid for his house, with each outer edge 1.5 m long. He gets the outer surface of the tank excluding the base, covered with square tiles of side 25 cm (see Fig. 13.5). Find how much he would spend for the tiles, if the cost of the tiles is Rs.360 per dozen.
Q.2: The paint in a certain container is sufficient to paint an area equal to 9.375 sq.m. How many bricks of dimensions 22.5 cm × 10 cm × 7.5 cm can be painted out of this container?
Q.3: 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.4: 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.5: Curved surface area of a right circular cylinder is 4.4 sq.m. If the radius of the base of the cylinder is 0.7 m, find its height.
Q.6: 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.7: 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.8: Find the total surface area of a cone, if its slant height is 21 m and diameter of its base is 24 m.
Q.9: 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.10: 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.