Question
Consider the following statements about
nanotechnology: 1. It involves manipulating materials at the atomic and molecular scale. 2. Nanotechnology is widely used in medicine, energy, and electronics. 3. It can only be applied to organic materials. Which of the above statements are correct?Solution
Nanotechnology deals with materials at the nanoscale and is applied across fields like medicine and electronics (statements 1 and 2). It is not limited to organic materials (statement 3 is incorrect).
A boat covers 45 km downstream in 2 h and the same distance upstream in 10 h. Find the speed (in km/h) of the boat in still water.
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A man can row at 6 kmph in still water. If the velocity of current is 3 kmph and it takes him 8 hour to row to a place and come back, how far is the place?
Speed of a boat in still water is 3 times more than the speed of stream. If boat covers 135 km in downstream in 9 hours, then find the time taken by the...
A man rows to a place 42 km away and comes back to the starting point. If the speed of the stream is 2 km/hr and the speed of the boat in still water is...
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