356: A man jumped at a speed of 5 metres per second from a stationary boat and the boat moved off with the speed of 0.5 metre per second. How many times is the mass of the boat greater than that of the man ?
(a) 5.5 times
(b) 4.5 times
(c) 2.5 times
(d) 10 times
357: Life expectancy is highest in the world in
(a) Canada
(b) Germany
(c) Japan
(d) Norway
358: Which one of the following plants can fix nitrogen from air?
(a) Rice
(b) Wheat
(c) Pea
(d) Maize
359: Which one of the following lakes forms an international boundary between Tanzania and Uganda ?
(a) Chad
(b) Malawi
(c) Victoria
(d) Zambezi
360: With reference to 'fuel cells' in which hydrogen-rich fuel and oxygen are used to generate electricity. Consider the following statements :
1. If pure hydrogen is used as a fuel, the fuel cell emits heat and water as by-products.
2. Fuel cells can be used for powering buildings and not for small devices like laptop computers.
3. Fuel cells produce electricity in the form of Alternating Current (AC).
Which of the statements given above is / are correct?
(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3