Practice Test

Q1) Neutron was discovered by Show Answer

Q2) Rutherford's scattering experiments led to the discovery of Show Answer

Q3) Isotones have the same Show Answer

Q4) The postulate that all atoms of an element are exactly alike was proved wrong with the discovery of Show Answer

Q5) Neutrons are present in all atoms except Show Answer

Q6) Deflection back of a few particles on hitting thin foil of gold shows that Show Answer

Q7) Bohr's model of atom is based upon Show Answer

Q8) Which of the following is not correct according to Planck's quantum theory ? Show Answer

Q9) Wavelength of radiowaves is Show Answer

Q10) Electronic energy is negative energy because Show Answer

Q11) The wave number of any spectral line for an electronic transition in the spectrum is directly proportional to Show Answer

Q12) Which of the following represents de-Broglie relation ?
Here the symbols have their usual meanings. Show Answer

Q13) In the photoelectric effect, the number of photoelectrons emitted per unit time depends upon the Show Answer

Q14) The splitting of the spectral lines under the influence of magnetic field is called Show Answer

Q15) The energy of an electron in an atomic orbital of hydrogen like species depends on Show Answer

Q16) The radius of first Bohr's orbit in hydrogen atom is Show Answer

Q17) The wave-mechanical model of atom is based upon Show Answer

Q18) The position sunshells in n = 3 energy shell are Show Answer

Q19) There is no difference between a 2p and a 3p orbital regarding Show Answer

Q20) The ratio of the difference in energy between the first and the second Bohr's orbit to that between the second and the third Bohr's orbit is Show Answer

Q21) The number of electrons in the M-shell of the element with atomic number 24 is Show Answer

Q22) A p-orbital can accomodate Show Answer

Q23) Which of the following pair has same electronic structure ? Show Answer

Q24) Which is different in isotopes of an element ? Show Answer

Q25) The de Broglie equation suggests that an electron has Show Answer

Q26) Which of the following is never true for cathode rays ? Show Answer

Q27) Which of the following does not contain number of neutrons equal to that of ? Show Answer

Q28) Which quantum number determines the shape of the sub-shell ? Show Answer

Q29) Principal azimuthal and magnetic quantum numbers are respectively related to Show Answer

Q30) Which of the following has more unpaired d-electrons ? Show Answer

Q31) Which of the following is not isoelectronic ? Show Answer

Q32) In a Bohr's model of an atom, when an electron jumps from n = 3 to n =1, how much energy will be emitted ? Show Answer

Q33) According to Dalton's atomic theory the smallest particle which is capable of independent existence is Show Answer

Q34) Anode rays were discovered by Show Answer

Q35) Neutron are present in all atoms except Show Answer

Q36) Relative mass of an electron is Show Answer

Q37) Electron was discovered by Show Answer

Q38) Consider the following statements in reference to the structure of atom.
(I) Isotopes are the atoms of the same element having same atomic number but different mass-numbers.
(II) Isobars are the atoms of different elements having different atomic number but same mass-number.
(III) Isotones are atoms of different elements having same number of neutrons.
Which of the above statements is/are correct ? Show Answer

Q39) Which one of the following pairs is correctly matched ? Show Answer

Q40) Which of the following statement is incorrect ? Show Answer

Q41) Who modified Bohr's theory by introducing elliptical orbits for electron path ? Show Answer

Q42) Bohr's theory is applicable to Show Answer

Q43) The value of Planck's constant is Show Answer

Q44) According to Bohr's model of an element Show Answer

Q45) The relation between energy of a radiation and its frequency was given by Show Answer

Q46) When a electron moves from a higher orbit to the lower orbit then Show Answer

Q47) Which of the following statements does not form part of Bohr's model of the hydrogen atom ? Show Answer

Q48) Which of the following electronic configuration is not possible ? Show Answer

Q49) The rule which states that no two electrons can have same value of all the four quantum numbers is Show Answer

Q50) The electronic configuration of chromium (Z=24) is Show Answer

Q51) An element M has atomic mass 19 and atomic number 9. Its ion is represented as Show Answer

Q52) Which of the following is the correct sequence in terms of increasing mass ? Show Answer

Q53) ASSERTION (A):
An atom is electrically neutral.
REASON (R) :
Atoms contains equal number of proton and neutron. Show Answer

Q54) ASSERTION (A) :
Gamma rays are more penetrating than X-rays.
REASON (R) :
Gamma rays have wavelengths that are smaller than those of X-rays. Show Answer

Q55) Two atoms are said to be isotopes, if Show Answer

Q56) The phenomenon of radioactivity was discovered by Show Answer

Q57) The process of nuclear fusion in the sun requires Show Answer

Q58) Which one among the following transitions is associated with the largest change in energy in hydrogen atom ? Show Answer

Q59) Which one among the following transitions of electron of hydrogen atom emits radiation of thee shortest wavelength ? Show Answer

Q60) Which one among the following is the most appropriate statement with respect to atomic weight of an element ? Show Answer

Q61) Which of the following pairs is/are correctly matched ?
(I) ISOTOPES Atoms with same atomic number but different atomic mass.
(II) ISOBARS Atoms with same number of neutrons but different atomic number.
(III) ISOTONES Atoms with same mass number but different atomic number.
Select the correct answer using the codes given below : Show Answer

Q62) Which one among the following most correctly determines the atomic number of an element ? Show Answer

Q63) The number of protons in a negatively charged atom (anion) is Show Answer

Q64) A stable nucleus (light with A < 10) has Show Answer

Q65) Protons and neutrons are bound in a nucleus by Show Answer