Question
Pipes A and B can fill a tank in 43.2 minutes and 108
minutes, respectively. Pipe C can empty it at 3 litres/minute. When all the three pipes are opened together, they fill the tank in 54 minutes. The capacity (in litres) of the tank is:Solution
LCM of 43.2, 108 and 54 = 432 units = Total work Efficiency of A = 432/43.2 = 10 units/min Efficiency of B = 432/108 = 4 units/min Efficiency of (A + B + C) = 432/54 = 8 units/min Efficiency of C = (10 + 4 – 8) units/min ⇒ 6 units/min Capacity of tank = (432/6) × 3 litres ⇒ (72 × 3) litres ⇒ 216 litres
Which of the following statements about DNA replication is correct?
The alimentary canal is basically a long tube extending from the ______ to the ______.
- What is the primary function of villi in the small intestine?
Which one of the following is not a process of DNA recombinant technology ?
Which muscle is recognized as the longest in the human body?
How many transmembrane alpha-helices are present in the G-protein coupled receptors?
Haemoglobin binds to oxygen in:
Which antibodies are present in individuals with blood group AB?
_______is a pure substance.
In Hershey and Chase experiment, some viruses grew on medium that contained :
