1. A rectangular water tank is 80 m × 40 m. Water flows into it through a pipe 40 sq. cm at the opening at a speed of 10 km/hr. By how much, the water level will rise in the tank in half an hour?
(1) 4/11 cm
(2) 5/9 cm
(3) 5/8 cm
(4) 4/5 cm
(5) None of these

2. A hall is 15 m long and 12 m broad. If the sum of the areas of the floor and the ceiling is equal to the sum of areas of the four walls, the volume of the hall is:
(1) 720
(2) 800
(3) 1200
(4) 2000
(5) None of these

3. A swimming pool 9 m wide and 12 m long is 1 m deep on the shallow side and 4 m deep on the deeper side. Its volume is:
(1) 309 m³
(2) 270 m³
(3) 360 m³
(4) 607 m³
(5) None of these

4 A metallic sheet is of rectangular shape with dimensions 48 m × 36 m. From each of its corners, a square is cut off so as to make an open box. If the length of the square is 8 m, the volume of the box (in m3) is:
(1) 5835
(2) 5120
(3) 6420
(4) 9260
(5) None of these

5. An open box is made of wood 3 cm thick. Its external dimensions are 1.46 m, 1.16 m and 8.3 dm. The cost of painting the inner surface of the box at 50 paise per 100 sqr cm is:
(1) Rs 140
(2) Rs 277
(3) Rs 415.50
(4) Rs 650
(5) None of these

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