Question
A man works twice as efficiently as a woman and three
times as efficiently as a child. If 3 men and 4 children can complete a task in 18 days, how long would it take for 6 women to finish the same task?Solution
Let the efficiency of a child be '2x' units/day So, efficiency of a man = 2x X 3 = '6x' units/day And, efficiency of a woman = 6x ÷ 2 = '3x' units/day Work done by 3 men and 4 children in 18 days = {(6x X 3) + (4 X 2x)} X 18 = (18x + 8x) X 18 = '468x' units So, time taken by 6 women to do the same work = 468x ÷ (3x X 6) = 26 days
In an electric motor, energy is transformed from:
Gauss's law is applicable only to:
Energy that is produced commercially from coal is called –
Which of the following is not a vector quantity?
‘Lubb-dupp’ sound is produced due to the action of
Two sound waves have frequencies 256 Hz and 260 Hz. The beat frequency is:
What is the rate of change of momentum called?
Which of the following materials behaves as a dielectric?
Planck’s constant has dimensions equivalent to which of the following?
What is the main principle behind the working of an electric motor? Â
Relevant for Exams:
