work done by man : work done by boy = 2: 1 let work done by a man in 1 day = 2 units let work done by a boy in 1 day = 1 units work done by 10 men in 8 days = 10 × 2 × 8 = 160 units work done by 3 men and 4 boys in 1 day = 3 × 2 + 4 × 1 = 10 units number of days = 160/10 = 16 days
The material which can be deformed permanently by heat and pressure is called a:
Boyle’s Law is applicable to gases under which conditions?
What was invented by 'Zacharias Janssen'?
Two amplifiers are connected one after the other in series (cascaded). The first amplifier has a voltage gain of 12 and the second has a voltage gain o...
Which of the following statement is correct?
I. Magnetite is a natural magnet
II. A freely suspended magnet always aligns in N-S direction
The mass of a star is two times the mass of the Sun. How it will come to an end?
An example of longitudinal waves (in a gas medium) is:
The rate of change of which of the following determines angular velocity?
If the vector sum of torques acting on a system is zero, then the object is in:
