SURFACE AREAS AND VOLUMES CLASS 10 NCERT EXEMPLAR exercise 12.4 solutions ( QUES-1 to 4) скачать в хорошем качестве

SURFACE AREAS AND VOLUMES CLASS 10 NCERT EXEMPLAR exercise 12.4 solutions ( QUES-1 to 4)

SURFACE AREAS AND VOLUMES CLASS 10 NCERT EXEMPLAR exercise 12.4 solutions ( QUES-1 to 4) A solid metallic hemisphere of radius 8 cm is melted and recasted into a right circular cone of base radius 6 cm. Determine the height of the cone. A rectangular water tank of base 11 m × 6 m contains water upto a height of 5 m. If the water in the tank is transferred to a cylindrical tank of radius 3.5 m, find the height of the water level in the tank. How many cubic centimetres of iron is required to construct an open box whose external dimensions are 36 cm, 25 cm and 16.5 cm provided the thickness of the iron is 1.5 cm. If one cubic cm of iron weighs 7.5 g, find the weight of the box. The barrel of a fountain pen, cylindrical in shape, is 7 cm long and 5 mm in diameter. A full barrel of ink in the pen is used up on writing 3300 words on an average. How many words can be written in a bottle of ink containing one fifth of a litre?