286: Two taps can fill a tank separately in 20 minutes and 30 minutes respectively. If both the taps are opened simultaneously, then the tank can be filled in:
(a) 50 minutes
(b) 15 minutes
(c) 12 minutes
(d) 10 minutes
287: Which one of the following cities (they were in the news in recent times) is not correctly matched with its country?
(a) Salamanca : Spain
(b) Cannes : Italy
(c) Cancun : Mexico
(d) Bruges : Belgium
288: Which of the following statements is not correct about Nalanda University ?
(a) It was an ancient Buddhist learning centre
(b) A Chinese Hiuen Tsang studied here
(c) We came to know about it only through the writings of Chinese pilgrims
(d) It was mainly responsible for spreading Buddhism to China, Japan and South East Asia
289: German silver is an alloy of
(a) copper, zinc and nickel
(b) copper, iron and tin
(c) iron, chromium and nickel
(d) copper, aluminium and nickel
290: Among the reasons for disguised unemployment in rural areas is
(a) Choice of a heavy industry model for economic development
(b) Low levels of technological development in the country
(c) Heavy pressure of population along with half-hearted implementation of agrarian reforms
(d) High illiteracy rates