Question
Mercury has become a serious toxic waste. It is
found in which of the following instruments?Solution
Mercury is a heavy silvery-white metal that is liquid at room temperatures. It is commonly used in thermometers, nano-meters and barometers, thus it is present in nearly every chemistry and physics lab. Confined in such instruments mercury itself is not likely to cause health problems, but if there is a means for mercury vapor to enter the environment, these highly toxic vapors present a health hazard.
A fluorescent lamp tube is filled with a gas containing low pressure mercury vapor and argon, xenon, neon, or krypton. Fish can absorb methyl mercury from their food and directly from water as it passes over their gills.
PQRS is a cyclic trapezium where PQ is parallel to RS and PQ is the diameter. If ∠QPR = 40° then the ∠PSR is equal to:
If the volume of a cylinder is 180π and the ratio of radius to its height is 6:5 then find the curved surface area of cylinder?
The external dimensions of an open rectangular wooden box are 88 cm by 74cm by 67cm. If the wood is 2cm thick all around, find the amount of volume of w...
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The area of a square is 2116 square metres. The breadth of a rectangle is half of the side of the square and the length of the rectangle is thrice its b...
A cylindrical tank has a height of 10 meters and a radius of 7 meters. If the tank is filled with water up to half of its height, find the volume of wat...
If the radius of the base and the height of a right circular cone are increased by 10%, what is the approximate percentage increase in volume?
The volume of a cube is 216 cm³. If the cost of painting the cube is Rs. 12 per cm², then find the cost of painting five faces of the cube.
On a rectangular wall of length 22 metres and height 19 metres, there is a window in the shape of triangle surmounted on a square. If the base of triang...
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