library opening hours

A shop is open 8 hours a day. How many hours would the shop be open in a week? => 56 hours or 448 hours or 15 hours or 336 hours..

A school library has a new set of books to be labeled. The senior librarian, Mr. George takes 6 hours to do this job and Mr. Francis, the junior librarian, takes 10 hours to do the same. How long would it take them working together to label the new set of books? => 5 h..

1. A wet porous substance in the open air loses its moisture at the rate proportional to the moisture content. If a sheet hung in the wind loses half of its moisture during the first hour, when will it have los..

The oesophagus opens into the stomach. The stomach lies on the left side of the abdomen. It is a sac-like organ, which is connected to the oesophagus at the anterior by a cardiac sphincter and to the small intestine at the posterior end by a pyloric sphincter. The stomach is an elastic or..

A wet porous substance in the open air loses its moisture at the rate proportional to the moisture content. If a sheet hung in the wind loses half of its moisture during the first hour, when will it have lost? (i) 95% moisture, weather condition remaining constant (ii) 90% mois..

Oil or fat is taken in a huge iron-pan called soap kettle and heated with open steam. 10% sodium hydroxide solution (lye) is added in a thin stream. The steam keeps the mass boiling and ensures thorough mixing as well. Saponification is complete after several hours to give a fr..

Diffusion in Liquids - If a bottle of perfume is opened in one corner of a room, it spreads in the whole room by diffusion. If you drop a little ink in a beaker of water it will spread by itself in the beaker of water and the color spreads uniformly. Diffusion is the natural process of in..