An excavator costs Rs. 20,00,000/- and has an estimated life of 8 years. It has no salvage value at the end of 8 years. The book value of the excavator at the end of 3 years using general double declining balance method is________?

Total strain energy theory for the failure of a material at elastic limit, is known________?

If the shearing stress is zero on two planes, then the angle between the two planes is________?

The sewers________?

The ultimate consolidation settlement of a structure resting on a soil________?

In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C. The BOD of raw sewage will be________?