Practice Questions

TLS Online TPP Program

#Question id: 10324

Which of the following is not true of all horizontally oriented phylogenetic trees, where time advances to the right?

#XL - S Microbiology

Each branch point represents a point in absolute time.
Organisms represented at the base of such trees are ancestral to those represented at higher levels.
The more branch points that occur between two taxa, the more divergent their DNA sequences should be.
The common ancestor represented by the rightmost branch point existed more recently in time than the common ancestors represented at branch points located to the left.

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TLS Online TPP Program

#Question id: 19950

#XL - P Chemistry

Atoms may be regarded as comprising of protons, electrons and neutrons. If the mass attributed to the neutrons were halved and that attributed to electrons were doubled then atomic mass of would

TLS Online TPP Program

#Question id: 19951

#XL - P Chemistry

How many electrons in an atom with atomic number 105 can have (n +l) = 8 ?

TLS Online TPP Program

#Question id: 19952

#XL - P Chemistry

The size of the nucleus is approximately

TLS Online TPP Program

#Question id: 19953

#XL - P Chemistry

The line spectrum ot two elements is not identical because .

TLS Online TPP Program

#Question id: 19965

#XL - P Chemistry

Bohr’s atomic model can explain the spectrum of

TLS Online TPP Program

#Question id: 19966

#XL - P Chemistry

The electronic configuration of a dipositive ion M⁺² is 2, 8, 14 and its mass number is 56. The number of neutrons present is