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Although Rutherford's model was enormously successful at explaining the scattering of alpha particles, there was a problem when the experimental data were used to calculate the mass of the nucleus. From the results of the scattering experiments, it was possible to calculate the charge on the nucle..

Although Dalton's theory of the existence of atoms was published in 1808, there was no clear idea of what an atom might look like until the early part of the twentieth century. With the advent of electricity and phenomenon of spectrum, experimentation underwent a change and a flurry of research in..

There are 19 books on Geography, 16 books on Zoology and 20 books on Math in a bundle of books. Three books are selected one after the other. Find P(book on Zoology, book on Geography, no book on Math). => 2 321 or 152 ..

There are 6 drawing books and 15 work books in a school bag. A book is picked from the bag. Which book is least likely to be picked? => drawing book or work book or both are equally likely or none of the above..

Botanical survey of India publishes this book. This book provides information about plant species which are rare, endangered or endemic, but all of which are grown in botanical garden..

Estimate the perimeter of the cover of the book. => 98 cm or 238 cm or 190 cm or 138 cm..

It is a sort of publication, which is published by IUCN, which provides information regarding threatened species of plants and animal..

A librarian recorded the number of books on each subject. Find the number of math books in the library. => 22 or 23 or 20 or 24..

A book costs $25. How much would 4 such books cost? => $29 or $21 or $100 or $80..

16 books in 2 bags. How many books in each bag? => 16 ÷ 2 = 8 or 2 ÷ 16 = 8 or 16 ÷ 2 = 9 or 16 - 2 = 9..