Q.1
An electron has a _____ charge.
  • negative
  • positive
  • neutral
  • All of above
Q.2
Choose the particle that has no charge.
  • nucleus
  • neutron
  • proton
  • electron
Q.3
The area around the nucleus where elections are located
  • nucleus
  • decepticon
  • electron cloud
  • borh model
Q.4
The first energy level can hold up to, how many electrons?
  • 8
  • 4
  • 2
  • 5
Q.5
What does the nucleus consist of?
  • Protons + Electrons
  • Neutrons + Electrons
  • Atoms
  • Protons + Neutrons
Q.6
Which particle has a similar mass to a proton?
  • Electron
  • Neutron
  • Photon
  • Marble
Q.7
How many electrons are in the element oxygen?
  • 7
  • 10
  • 8
  • 9
Q.8
What is the atomic number for an element with three protons?
  • 2
  • 1
  • 3
  • 6
Q.9
Which statement best describes an electron?
  • Smaller mass than a proton and a negative charge
  • Smaller mass than a proton and a positive charge
  • Greater mass than a proton and a negative charge
  • Greater mass than a proton and a positive charge
Q.10
The quantum of light is
  • photon
  • neutron
  • electron
  • proton
Q.11
For principal quantum number n=the total number of orbitals having l=3 is
  • 3
  • 5
  • 7
  • 9
Q.12
Which is the isotone of 32Ge(atomic numberXmass number)
  • 32Ge77
  • 34Ge78
  • 36Ge79
  • 32Ge78
Q.13
Which of the following has the maximum number of unpaired d-electrons?
  • Ni3+
  • Cu+
  • Zn2+
  • Fe2+
Q.14
Uncertainity in the position of an electron (mass= 9.1 x 10-kg) moving with a velocitym/s, accurate upto 0.will be
  • 5.76 x 10-2 m
  • 1.92 x 10-2 m
  • 3.84 x 10-2 m
  • 19.2 x 10-2 m
Q.15
The maximum kinetic energy of photoelectrons ejected from a metal, when it is irradiated with radiation of frequency 2 xs-1 is 6.x 10-J. The threshold frequency of the metal is
  • 2 x 10-14 s-1
  • 3 x 1014 s-1
  • 1 x 1014 s-1
  • 1 x 10-14 s-1
Q.16
Which of the following is isoelectronic with Ca2+
  • Fe3+
  • S2-
  • Mg2+
  • P
Q.17
The sub-shell with n=l=2 can accomodate a maximum of
  • 10 electrons
  • 12 electrons
  • 36 electrons
  • 72 electrons
Q.18
Which of the following radiations has largest energy?
  • λ = 30 nm
  • λ = 300 pm
  • ν = 3 x 10-12 s-1
  • ν = 3 x 10-10 s-1
Q.19
The energy of an electron in 3rd orbit of hydrogen atom is:
  • -1311.8 kJ/mol
  • -82.0 kJ/mol
  • -145.7 kJ/mol
  • -327.9 kJ/mol
Q.20
The radius of first orbit of hydrogen is 0.Å. The radius of second orbit would be
  • 1.06 Å
  • 0.26 Å
  • 0.53 Å
  • 2.12 Å
0 h : 0 m : 1 s