WorksheetsPlayTest #3- Army public school (Classic)
Total questions: 20
Worksheet time: 11mins
The electrons present in the outermost shell are called
Valency electrons
Octate electrons
Duplet electrons
Valence electrons
The isotope used to remove the brain tumours and treatment of cancer is
U-235
Na-24
Iodine
C0-60
The isotope deuterium of hydrogen has
No neutrons and one proton
One neutrons and two protons
One electron and two neutron
One proton and one neutron
In an alpha scattering experiment, few alpha particles rebounded because
Most of the space in the atom is occupied
Positive charge of the atoms very little space
The mass of the atom is concentrated in the centre
All the positive charge and mass of the atom is concentrated in small volume
Which isotope is used in the nuclear power plants to generate electricity?
Uranium 235
Iodine 131
Cobalt 60
Uranium 238
What property of an element determines its chemical behaviour?
Size of an element
Valency of an element
Molar mass of the element
(d) None of these
Which of the following does not match the characteristics of an Isotope?
Isotopes of some elements are radioactive
Isotopes are the atoms of different elements
Isotopes differ in number of neutrons
Isotopes have similar chemical properties
Which of the following elements does not exhibit the electrovalencey?
Sodium
Calcium
Carbon
Chlorine
Which scientist gave the concept of fixed energy levels around the nucleus?
Ernest Rutherford
Neils Bohar
J.J.Thomsan
None of these
What prevents an atom from being collapsed?
The nuclear forces
Movement of electrons in discrete energy levels
The electron-electron repulsions
All of these
Which of the following is an incorrect statement in reference with observation in Rutherford’s α-particle scattering experiment?
Some of the α-particles rebound after hitting the gold foil
Some of the particles deflected from their path
Some of the particles not pass through the gold foil
Most of the particles pass straight through the gold foil
The orbit or shells are called
Energy level
Subshells
Parameters
K shell
How many electrons occupy in K shell?
1
2
4
8
How many electron present in outermost shell of lithium atom.
1
2
7
0
Zero valence electron of element is always ______
Halogen
Metals
Nonmetals
Noble gaseous
Which isotopes is not from hydrogen family?
Protium
Deuterium
Tritium
None of the above
Bohr proposed that while revolving in discrete orbits, the electrons:
Gain energy
Lose energy
Do not radiate energy
First lose energy and then gain energy
Which of the following experiments led to the discovery of neutrons?
Discharge tube experiment
Alpha ray scattering experiment
Chadwick’s experiment
Oil drop experiment
Dalton's atomic theory successfully explained
Law of conservation of mass
Law of constant composition
Law of radioactivity
Law of multiple proportion
Atoms combine to attain stable configuration by
Sharing electrons
accepting electrons
donating electrons
None of these
