Question
If one child has half the work efficiency of an adult,
determine the duration required for 8 children to construct a wall, which is 60% as large as the one built by 12 adults in 15 days.Solution
Let the efficiency of each man be '2x' units/day So, total work = 2x X 12 X 15 = '360x' units And efficiency of a child = 2x ÷ 2 = 'x' units/day So, required time = (360x X 0.6) ÷ (8 X x) = 27 days Hence, option a.
The energy that can harness heat stored below the earth's surface is known as –
Two cities are 125 km apart. Electric power is sent from one city to another city through copper wires. The fall of potential per km is 9.6 volt and the...
A 10 μF capacitor is charged to 50 V and then connected across an uncharged 20 μF capacitor. What is the final potential difference across both capac...
How long does an image remain on the retina after the object is removed?
What is the phenomenon of bending of light around corners called? Â
Which of the following rays are not deflected by a magnetic field?
Global warming is expected to result in
A body starts from rest and accelerates uniformly. After t seconds, it covers a distance S. What is the ratio of the distance covered in the first half ...
A sugar solution in a tube of length 2.0 dm produces optical rotation of 12°. Then, the sugar solution is diluted to one half of its initial concentra...
An image formed by a plane mirror is ______.
Relevant for Exams:
