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Subjective Questions
A raindrop of radius 2.0 mm falls from a height of 500 m above the ground. Due to viscosity of air, its acceleration gradually decreases until it becomes zero when the drop is at half its original height. The drop then falls with a uniform terminal speed. What is the work done by the gravitational force during the first and second half of its journey?

Chemistry

3.546 g of bleaching powder is ground to a fine paste with water and made up to 100 mL. 25 mL of this solution after addition of KI and dilute acetic acid required 20 mL of 0.125 M thiosulphate solution. Calculate the percentage of available chlorine in the sample of bleaching powder.

Mathematics

Multiple Choice Questions
If w is an imaginary cube root of unity, then value of expression 2(1 + w) (1 + w²) + 3(2 + w) (2 + w²) + ........... + (n + 1) (n + w) (n + w²) is