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The nucleus of an atom consists of

A.	protons only	B.	protons and electrons
C.	protons and neutrons	D.	protons neutrons and electrons

A proton is identical with

A.	ionised hydrogen molecule	B.	the nucleus of hydrogen atom
C.	the nucleus of deuterium	D.	an ?-ray particle

The electron is identical with

A.	hydrogen ion	B.	positron
C.	an ?-ray particle	D.	an ?-ray particle

In an atom the electrons

A.	move round the nucleus at random	B.	are embedded in space around the nucleus
C.	are distributed as three dimensional charge clouds around the nucleus	D.	are stationary in various energy levels

The electron is a particle with a mass of about

A.	1/18 of the lightest nucleus	B.	1/180 of the lightest nucleus
C.	1/1800 of the lightest nucleus	D.	1/18000 of the lightest nucleus

The positron is almost as heavy as

A.	an electron	B.	a proton
C.	a neutron	D.	a meson

Positive ions are formed from neutral atoms by the loss of

A.	neutrons	B.	protons
C.	electrons	D.	mesons

An electrovalent compound is made up of

A.	neutral atoms	B.	electrically charged atoms or groups of atoms
C.	electrically charged molecules	D.	neutral molecules

The life of a meson is about

A.	10-18 sec	B.	10-2 sec
C.	10-18 sec	D.	1 sec

10.

The mass of a meson with charge +e is

A.	equal to that of a proton	B.	equal to that of an electron
C.	275 times that of an electron	D.	1/1850 of the mass of an electron