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Physics |
Multiple Choice Question with Only One Choice Correct
A steel metre scale is to be ruled so that the millimetre intervals are accurate to about 5 x 10-5 m at a certain temperature. The maximum temperature variation allowed during ruling is (the coefficient of linear expansion of steel = 10 x 10-6 K-1)
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| (a) |
2 oC |
(b) |
5 oC |
| (c) |
7 oC |
(d) |
10 oC |
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Chemistry |
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The half-life of radium is 1620 years. How many radium atoms decay in 1 s in 1-g sample of radium? The molar mass of radium is 226 g mol-1.
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Mathematics |
| A rectangle PQRS has its sides PQ parallel to the line y = mx and vertices P, Q, and S on the lines y = a, x = b and x = -b, respectively. Find the locus of the vertex R. |
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