Question
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?Solution
The correct answer is D
12 man can make a wall in 6 days. How many men required to complete the same work in 3 days ?
A and B together, B and C together and A and C together can complete a piece of work in 44 days, 33 days and 36 days respectively. Find the ratio of the...
A can do a work in 10 days and B in 15 days. If they work on it together for 4 days then in how many days the remaining work will be completed by B?
A can complete a task in 10 days, and B can complete it in 15 days. After 3 days of working together, B leaves. How many more days will A take to finis...
Mike and Jenny alone can complete a task in 24 days and 40 days respectively. They aim to finish the work in 'd' days. What percentage increase in Jenny...
P can do a piece of work in 15 days, Q can complete double the work in 60 days and R can do the work in 40 days. If all of them together earn Rs. 3000, ...
3 men, 4 women and 5 boys can do a piece of work in 15 days, 20 days and 25 days respectively. For first 3 days 3 men and 2 women work together and for ...
‘A’ and ‘B’ can do a piece of work in 15 days and 20 days, respectively. They started working together but ‘A’ left after 3 days. Find the t...
A and B together can complete a work in 10 days. B and C together can do it in 12 days, and A and C together can do it in 15 days. In how many days will...
Relevant for Exams:
