Practice Test

Q1) Nucleus of an atom was discovered by Show Answer

Q2) Discharge tube experiments demonstrate the emission of certain invisible rays from Show Answer

Q3) Cathode rays were named as electrons by Show Answer

Q4) Cathode rays have Show Answer

Q5) Protons were discovered by_______ Show Answer

Q6) Which statement is WRONG about anode rays? Show Answer

Q7) Which of the following statement is wrong? Show Answer

Q8) The charge to the mass ratio [e/m] of positive particles Show Answer

Q9) The mass of a neutron is Show Answer

Q10) Neutrons are present in all atoms except Show Answer

Q11) Atomic number of an element is equal to the number of Show Answer

Q12) The number of electrons and neutrons of an element is 18 and 20 respectively. Its atomic mass is Show Answer

Q13) Which scientists showed that atomic number represents the number of protons in the nucleus of an atom? Show Answer

Q14) The atomic weight and atomic number of an element are A and Z respectively. The number of neutrons in the atom of that element is calculated as Show Answer

Q15) The introduction of a neutron into the nucleus of an atom would lead to a change in Show Answer

Q16) Which of the following has same position in periodic table? Show Answer

Q17) The postulate that all the atoms of an element are exactly alike was proved wrong with the discovery of Show Answer

Q18) Antoine Becquerel proved that atoms are divisible with the help of his famous discovery of Show Answer

Q19) When alpha particles are sent through a thin metal foil, most of them go straight through the foil because Show Answer

Q20) Who discovered the nucleus of an atom? Show Answer

Q21) Rutherford's experiment established that Show Answer

Q22) The wavelength of a spectral line for electron transition is inversely related to Show Answer

Q23) The phenomenon of splitting of spectral lines under the influence of the magnetic field is known as Show Answer

Q24) When an electron jumps from lower energy level to higher energy level Show Answer

Q25) In which case, the wavelength of the radiation emitted will be minimum? Show Answer

Q26) Bohr's orbits are called stationary orbits because Show Answer

Q27) Which one of the following statement is incorrect? Show Answer

Q28) When electrons revolve in stationary orbits, Show Answer

Q29) Which among the following transition will give Lyman series in the hydrogen line spectrum? Show Answer

Q30) The spectral line obtained when an electron jumps from n= 6 to n= 2 level in hydrogen atom belongs to the Show Answer

Q31) Which of the corresponding regions of the spectral lines of hydrogen atom is not correct? Show Answer

Q32) Bohr model of atom can explain Show Answer

Q33) Brackett series are produced when the electrons from the outer orbits jump to Show Answer

Q34) According to Bohr's atomic model, P shell contains_______ electrons. Show Answer

Q35) The dual nature of radiations was proposed by Show Answer

Q36) Which of following is not a characteristic of Planck's quantum theory of radiation? Show Answer

Q37) Which of the following statement concerning light is false? Show Answer

Q38) According to de Broglie equation, wavelength of electron is Show Answer

Q39) The de-Broglie equation suggests that an electron has Show Answer

Q40) Heisenberg's uncertainty priciple rules out the exact simultaneous measurement of Show Answer

Q41) A region in space around the nucleus of an atom where the probability of finding an electron is maximum is called Show Answer

Q42) The quantum number not obtained from the solution of Schrodinger wave equation is Show Answer

Q43) The probability of finding an electron at the nucleus is Show Answer

Q44) Which of the following sets of quantum number is not possible for 23rd electron of Cr (At. No. 24)? Show Answer

Q45) How many quantum numbers are required to define the electron in atom? Show Answer

Q46) The possible subshells in n = 3 energy shell are Show Answer

Q47) The principal quantum number n describes the Show Answer

Q48) The angular momentum of an electron in atomic orbital depends upon the Show Answer

Q49) The total number of orbitals in the fifth energy level is Show Answer

Q50) To give a designation to an orbital, we need Show Answer

Q51) The designation of a subshell with n= 4 and l= 3 is Show Answer

Q52) 2p orbitals have Show Answer

Q53) The two electrons present in an orbital are distinguished by Show Answer

Q54) The value of azimuthal quantum number for electrons present in 4p - orbitals is Show Answer

Q55) If the value of azimuthal quantum number of an electron is 2, then which of the following value of magnetic quantum numbers is not permissible? Show Answer

Q56) If m has seven values, the value of azimuthal quantum number should be Show Answer

Q57) The principal quantum number of an atom is related to the Show Answer

Q58) The azimuthal quantum number is related to Show Answer

Q59) Principal, azimuthal and the magnetic quantum numbers are respectively related to Show Answer

Q60) Magnetic quantum number gives Show Answer

Q61) Principal quantum number describes the Show Answer

Q62) Which of the following orbitals does not exist? Show Answer

Q63) How many electrons can have n = 4 and l = 2? Show Answer

Q64) The maximum number of electrons in p-orbital with n = 6, m = 0 is Show Answer

Q65) The electrons present in K-shell of the atom will differ in Show Answer

Q66) Value of l = 1 represents________ Show Answer

Q67) The maximum number of electrons in s, p and d- subshells are Show Answer

Q68) In s orbital as the value of n increases, the size of the s orbital Show Answer

Q69) Which shape is associated with the orbital designated by n = 2, l = 1? Show Answer

Q70) The shape of the orbital with the value of l = 2 and m = 0 is Show Answer

Q71) For a dumb-bell shaped orbital, the value of l is Show Answer

Q72) The order of filling of electrons in the orbitals of an atom will be Show Answer

Q73) The shape of s- orbital is Show Answer

Q74) All ________ orbitals are non- directional and spherically symmetrical. Show Answer

Q75) when 3d orbitals are completely filled, new electron will enter in Show Answer

Q76) What do you mean by degenerate orbitals? Show Answer

Q77) Hund's rule deals with the distribution of electrons in Show Answer

Q78) The Aufbau principle implies that a new electron will enter an orbital for which Show Answer

Q79) The number of unpaired electrons in chromium ( Z=24) is Show Answer

Q80) The tendency of an electron to exchange energy is _______ when the subshell is either half filled or completely filled. Show Answer

Q81) According to Dalton's theory, atoms of different elements Show Answer

Q82) Canal rays is a beam of Show Answer

Q83) Electrons, protons and neutrons are known as ________ particles of atom Show Answer

Q84) The electrons placed in the different shells of an atom of an element are… K-shell: 2 electrons, L-shell: 8 electrons, M-shell: 4 electrons. The atomic number of the element is Show Answer

Q85) which of the following is the correct statement for isotopes? Show Answer

Q86) J. J Thomson proposed that an atom has ______ shape. Show Answer

Q87) Which of the following statement about spectral series is incorrect? Show Answer

Q88) The maximum number of electrons in f- subshell is Show Answer

Q89) The photoelectric emission from a surface starts only when the light incident upon the surface has a certain minimum Show Answer

Q90) The total number of subshell in the 4th shell is Show Answer

Q91) Which of the following statement regarding the probability of finding the electron in p-orbital is wrong? Show Answer

Q92) Stability of completely filled and half filled subshell can be explained on the basis of Show Answer

Q93) Experiments revealing that atom is composed of fundamental particles rejected_________model of atom. Show Answer

Q94) Which of the following statements about quantum numbers is wrong?
Show Answer

Q95) The conclusion that an orbital can accommodate only two electrons is derived from
Show Answer

Q96) ______ principle limits the number of electrons in any orbital of an atom.
Show Answer

Q97) " The exact path of electron in 2p-orbital cannot be determined". This statement is based upon
Show Answer

Q98) In a given atom, no two electrons can have the same values for all the four quantum number. This is called
Show Answer

Q99) Electrons were discovered by
Show Answer

Q100) The conclusion that every additional electron enters the orbital with lowest possible energy has been drawn from
Show Answer

Q101) Neutron is denoted by Show Answer

Q102) Which of the following has more electrons than neutrons? Show Answer

Q103) The value of Planck's constant is Show Answer

Q104) Which experimental observation correctly accounts for the phenomenon? (read as Experimental observation : Phenomenon) Show Answer

Q105) Which of the following gave the idea of a nucleus of the atom? Show Answer

Q106) Which of the following expression imposes the condition of quantization of energy of an electron in an atom? Show Answer

Q107) According to Bohr's theory the angular momentum of an electron in the fourth orbit is Show Answer

Q108) The energy of an atom in the 3rd orbit is -E. The energy of an electron in the first orbit will be Show Answer

Q109) The value of Rydberg constant is Show Answer

Q110) Which of the following is false regarding Bohr's model? Show Answer

Q111) To which electron transition between Bohr orbitals in hydrogen does the second line in the Balmer series belong? Show Answer

Q112) The correct expression derived for the energy of an electron in the nth energy level of H-atom is Show Answer

Q113) Which of the following statement is incorrect? Show Answer

Q114) The unit of frequency of radiation is Show Answer

Q115) Which of the following is not correct? Show Answer

Q116) Mathematically, Heisenberg's uncertainty principle can best be explained by Show Answer

Q117) The number of electronic subshells in the nth quantum level are Show Answer

Q118) The number of orbitals in any shell (n) is equal to Show Answer

Q119) The maximum number of electrons present in any main energy level is given by Show Answer

Q120) The number of electrons in a sub shell is equal to Show Answer

Q121) Which of the following sets of quantum number is not permitted? Show Answer

Q122) Which d-orbital does not have four lobes? Show Answer

Q123) Which of the following statement is correct? Show Answer

Q124) Which of the following configuration is incorrect? Show Answer

Q125) The correct electronic configuration of nitrogen is Show Answer

Q126) Which one of the following shows the correct electronic configuration of the outermost shell in inert gas? Show Answer

Q127) In uni electron system, the wave number of a spectral line is directly proportional to Show Answer

Q128) Which of the following represents the de Broglie relation? Show Answer

Q129) Which of the following arrangements of electrons is most likely to be stable? Show Answer

Q130) Cathode rays have same charge to mass ratio as Show Answer