Question
A alone can do a piece work in 15 days and the time
taken by A alone is 50% more than the time taken by B. They started work together alternatively starting from A. Find in how many days, they both can complete the work.Solution
A = 15 days B = 15 x (100/150) = 10 days Let the total work be 30 units. Efficiency of A = 2 units Efficiency of B = 3 units Working alternatively starting from A = [30/(2 + 3)] x 2 = 12 days
Which vitamin is produced in the skin when exposed to sunlight?
Which of the following solutions will not change the colour of blue litmus paper to red?
 1. Acid solution
2. Base solution
3. Com...
The joint where the neck joins the head is known as which of the following?
The position, relative size and nature of the image formed by a concave lens for an object placed at infinity are respectivelyÂ
Vinegar, commonly used in cooking, is primarily composed of which acid?
Which of the following acids is present in an ant’s string?
Kilowatt-hour is the unit of :
Tear gas used by the police to disperse the mob contains –
In a concave mirror which of the following pair of position of object – position of image is correct?
I. At C - At C
II. At F – At Infinity
The magnetic field lines around a straight current carrying conductor are
