261: In which one among the following is the speed of sound maximum ?
(a) Air at 100 degree celcius
(b) Air at 0 degree celcius
(c) Wood
(d) Water
262: The following figure represents sales (in thousands) over the period 1978 to 1983 :
The sales in 1981 exceeded that in 1979 by
(a) Rs. one hundred
(b) Rs. ten thousand
(c) Rs. one lakh
(d) Rs. ten lakh
263: Where is Davos the venue of the annual meeting of World Economic Forum located?
(a) France
(b) Germany
(c) Switzerland
(d) Luxembourg
264: A merchant wants a gross profit of 25 per cent on the sales. Thus the percentage he should add to the cost price will be:
(a) 25 per cent
(b) 33 per cent
(c) 66 per cent
(d) 75 per cent
265: Which one of the following stars is nearest to the earth ?
(a) Polaris
(b) Alpha Centauri
(c) Sun
(d) Sirius