Question
Which of the following elements is a
metalloid?Solution
Silicon is a chemical element with the symbol Si and atomic number 14. It is a hard, brittle crystalline solid with a blue-grey metallic luster , and is a tetravalent metalloid and semiconductor.
Speed of a boat in still water is 15 km/h while the speed of stream is ____ km/h. Total time taken by the boat to go 150 km upstream and 225 km downstre...
If the sum of upstream and downstream speed is 24 km/hr and the speed of the current is 5 km/hr, then find the approximate time taken to cover 36 km dow...
Boat ‘A’ can cover 150 km in still water in 15 hours. In still water, if the ratio of the speed of boat ‘A’ to that of ‘B’ is 5:1 and the sp...
The speed of a boat in still water is 12 km/h and the speed of the stream is 3 km/h. What is the speed of the boat upstream?
Speed of a boat in still water is three times the speed of the boat in upstream. If the boat takes 30 minutes to cover 27 km in downstream, then find th...
Speed of a boat in still water to speed of boat in upstream is 8: 7. If the boat can travel 450 km in downstream in 10 hours, then find the time taken b...
The speed of the stream is 10 km/h. Boat ‘A’ covers 88 km distance against the stream in 11 hours and boat ‘B’ covers 106 km distance against th...
- A boat covers a distance of 270 km downstream in 6 hours. If the boat's speed in upstream direction is one-third of its downstream speed, calculate the tim...
The ratio of the speed of boats ‘A’ and ‘B’ in still water is 8:9, respectively. The speed of the current is 25% of the speed of boat ‘A’ in...
Boat ‘A’ covers 200 km in downstream in 10 hours. If the speed of stream is 2 km/hr then find the time taken by boat ‘A’ to cover 160 km in upst...
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