681: A group of workers promise to complete a piece of work in 10 days, but five of them do not report for work. If it took the remaining workers 12 days to complete the work, then the number of workers originally hired was
(a) 15
(b) 25
(c) 30
(d) 45
682: The places Alwaye, Koyna and Korba have:
(a) Thermal Stations
(b) Oil Refineries
(c) Hydro Stations
(d) Aluminium Industries
683: If x and y are positive integers such that (3x + 7y) is a multiple of 11, then which of the followings are divisible by 11?
684: The definition of a small-scale industry is based on
(a) The market outreach of a unit
(b) The size of the sales of a unit
(c) The fact whether the products manufactured fall in a list drawn up by the Ministry of Industry
(d) The value of the plant and machinery investment in a unit
685: Municipal water in India is generally treated with:
(a) Chlorine
(b) Potassium permanganate
(c) Sodium Chloride
(d) Sodium Carbonate