Question
The functioning of a quartz crystal in a watch is based
on which principle?Solution
Quartz crystals in watches work on the piezoelectric effect, where they generate an electric charge in response to mechanical stress, maintaining precise timekeeping.
A boat travels 48 km downstream in 4 hours and 24 km upstream in 6 hours. What is the speed of the boat in still water?
Boat ‘A’ can cover 120 km in still water in 10 hours. In still water, if the ratio of the speed of boat ‘A’ to that of ‘B’ is 4:5 and the sp...
A car has to cover a distance of 240 km in 30 hours. If it covers half of the journey in 3/5 th of the time, the speed to cover the remainin...
Ratio of still water speeds of three boats is 3:4:5. The first boat travels downstream, the second and third boats travel upstream. They travel in strea...
Speed of current is equal to 30% of speed of boat in still water. If the boat takes 6 hours to cover 120 km in still water, then find the time taken by ...
A man travels x km downstream and the same distance upstream in 11 hours. He can row 3x km downstream in 6 hours. Find the time required to row x km ups...
A boat takes 5 hours longer to travel 15 km upstream than it does to travel 20 km downstream. The speed of the boat in still water is 5 km/hr. Calculate...
The sum of the speeds of two boats A and B in still water is 56 km/hr. such that the speed of boat A in still water is 25% less than that of boat B in s...
A boat covers 12 km upstream and 20km downstream in 4 hours while it covers 20km upstream and 12 km downstream in 4*1/2 hours. What is the velocity of c...
The downstream speed of a boat is 4 km/hr more than its upstream speed and the ratio of the speed of the boat in still water to the speed of the stream ...
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