506: 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
507: Which one of the following brings out the publication called "Energy Statistics" from time to time?
(a) Central Power Research Institute
(b) Planning Commission
(c) Power Finance Corporation Ltd.
(d) Central Statistical Organization
508: Consider the following statements:
In the electoral college for Presidential Election in India.
1. The value of the vote of an elected Member of Legislative Assembly equals to : State population / (divided by) No. of elected MLA of the state *(multiply by) 100
2. The value of the vote of an elected Member of parliament equals to: Total value of the votes of all elected MLA / (divided by Total no. of elected MP's
3. There were more than 5000 members in the latest election
Which of these statements is/are correct?
(a) 1 and 2
(b) Only 2
(c) 1 and 3
(d) Only 3
509: At one of the places in India, if you stand on the seashore and watch the sea, you will find that the sea water recedes from the shore line a few kilometres and comes back to the shore, twice a day, and you can actually walk on the sea floor when the water recedes. This unique phenomenon is seen at
(a) Bhavnagar
(b) Bheemunipatnam
(c) Chandipur
(d) Nagapattinam
510: That the per capita income in India was Rs. 20 in 1867-68, was ascertained for the first time by
(a) M. G. Ranade
(b) Sir W. Hunter
(c) R. C. Dutta
(d) Dadabhai Naoroji