Discovery of charged particles - class-VIII
discovery of charged particles
Questions
In 1909, __________ discovered nucleus in his famous gold foil experiment.
- Rutherford
- Goldstein
- J.J.Thompson
- None of the above
Protons and neutrons are heavier than electrons and reside in the center of the atom, which is called ______ .
- the nucleus
- the Orbit
- the orbitals
- none of the above
All the mass of the atom resides in the _____ .
- nucleus
- molecules
- ions
- orbit
The fraction occupied by nucleus in an atom is:
- $1/10^{-10}$
- $1/10^8$
- $1/10^{-5}$
- $1/10^5$
Which of the following elements has maximum density of nucleus?
- ${ { _{ 14 }{ Si } } }^{ 30 }$
- ${ { _{ 15 }{ P } } }^{ 31 }$
- ${ { _{ 8 }{ O } } }^{ 16 }$
- All have same desity
The radius of an atomic nucleus (say $He$) is of the order of:
- $10^{-10} cm$
- $10^{-13}cm$
- $10^{-15}cm$
- $10^{-8}cm$
The atomic nucleus contains:
- protons
- neutrons
- electrons
- photons
The ratio of the "e/m" (specific charge) values of a electron and an $\alpha$-particle is -
- $2:1$
- $1:1$
- $1:2$
- none
The size of nucleus is of the order of
- ${10^{ - 12}}\;{\text{m}}$
- ${10^{ - 8}}\;{\text{m}}$
- ${10^{ - 15}}\;{\text{m}}$
- ${10^{ - 10}}\;{\text{m}}$
Which form of energy is a measure of the electron stability when it is in bound state with nucleus?
- Potential energy
- Kinetic energy
- Vibrational energy
- Ionization energy
The volume $(V)$ of nucleus of an atom is expressed in terms of mass no. $(A)$ of atom as :
- $V\propto A$
- $V\propto A^{1/3}$
- $V\propto A^2$
- $V\propto A^3$
Compared to size of its nucleus, the size of an atom is about :
- ten times greater
- the same
- a hundred times greater
- one hundred thousand times greater
- a thousand times greater
Mirror nuclei are those which have:
- the same number of protons
- the same number of neutrons
- the number of protons equal to number of neutrons
- the number of neutrons in one equal to the number of protons in the other.
- True
- False
All atoms contain neutrons in their nuclei except:
- Protium
- Helium
- Neon
- Chlorine
Outside a nucleus :
- neutron is stable
- proton and neutron both are stable
- neutron is unstable
- neither neutron nor proton is stable
The density of nucleus is about _______ times the density of atom.
- $10^{-14}$
- $10^{12}$
- $10^{-8}$
- $10^{10}$
The particles present in the nucleus of an atom are :
- the proton and the electron
- the electron and the neutron
- the proton and the neutron
- none of these
The space between a proton and electron in hydrogen atom is :
- full of air
- full of ether
- full of electromagnetic radiations
- empty
Nuclides having the same atomic and mass numbers are known as :
- isotones
- isomers
- isobars
- isotopes
The nucleus of the hydrogen atom is called as:
- neutron
- electron
- proton
- nucleons
Nucleus is composed of two kinds of subatomic particles:
- protons and neutrons
- electrons and neutrons
- protons and electrons
- none of the above
An atom has two main regions. Which are those?
- Planetary electrons and energy levels
- Nucleus and kernel
- Principal energy levels and energy sublevels
- Nucleus and energy levels
The nucleus of the atom consists of:
- protons and neutrons
- protons and electrons
- neutrons and electrons
- protons, neutrons and electrons
Radius of a nucleus is proportional to:
- $A$
- ${A}^{{1}/{3}}$
- ${A}^{2}$
- ${A}^{{2}/{3}}$
The ratio of the volume of the atom and the volume of the nucleus is:
- ${10}^{10}$
- ${10}^{12}$
- ${10}^{15}$
- ${10}^{20}$
Size of the nucleus is:
- $1A^0$
- $10^{-16}m$
- $10^{-15}m$
- $10^{-14}m$
Which is characteristic of unstable nucleus?
- $n/p$ ratio is high
- Low binding energy
- High packing fraction
- None of these
The density of nucleus is of the order of:
- ${ 10 }^{ 5 }kg{ m }^{ -3 }$
- ${ 10 }^{ 10 }kg{ m }^{ -3 }$
- ${ 10 }^{ 17 }kg{ m }^{ -3 }$
- ${ 10 }^{ 25 }kg{ m }^{ -3 }$
The radius of nucleus is:
- proportional to its mass number
- inversely proportional to its mass number
- proportional to the cube root of its mass number
- not related to its mass number