Multiple Choice Questions
Multiple Choice Questions
Q.1. The number of valence electrons in Cl ion are:
(a) 7
(b) 8
(c) 1
(d) 6
Q.2. An atom with atomic number 9 and mass number 19 will have the following constituents :
(a) 9p, 9n, 9e
(b) 9p, 10n, ge
(c) 10p, 9n, 9e
(d) 9p, 9n, 10e
Q.3. An alpha particle is also known as:
(a) subatomic particle
(b) an unionised helium atom
(c) a neutral particle
(d) a doubly-charged helium ion
Q.4. In the Thomson’s model of atom, which of the following statements are correct?
(1) The mass of the atom is assumed to be uniformaly distributed over the atom
(ii) The positive charge is assumed to be uniformaly distributed over the atom
(iii) The electrons are uniformaly distributed in the positively charged sphere
(iv) The electrons attract each other to stabilise the atom
(a) (i), (ii) and (iii)
(b) (i) and (iii)
(c) (i) and (iv)
(d) (i), (iii) and (iv)
Q.5. Rutherford’s a-particle scattering experiment showed that :
(i) Electrons have negative charge
(ii) The mass and positive charge of the atom is concentrated in the nucleus
(iii) Neutron exists in the nucleus
(iv) Most of the space in atom is empty Which of the above statements are correct?
(a) (i) and (iii)
(b) (ii) and (iv)
(c) (i) and (iv)
(d) (iii) and (iv)
Q.6. In a sample of ethyl ethanoate (CH3COOC₂H5), the two oxygen atoms have the same number of electrons but different number of neutrons. Which of the following is the correct reason for it?
(a) One of the oxygen atoms has gained electrons
(b) One of the oxygen atoms has gained two neutrons
(c) The two oxygen atoms are isotopes
(d) The two oxygen atoms are isobars
Q.7. Which of the following statement is always correct ?
(a) An atom has equal number of electrons and protons.
(b) An atom has equal number of electrons and neutrons.
(c) An atom has equal number of protons and neutrons.
(d) An atom has equal number of electrons, protons and neutrons.
Q.8. The isotope of cobalt used in the treatment of cancer and iodine used in the treatment of goitre respectively are:
(a) I – 132 and Co 61
(b) I – 132 and Co – 60
(c) I – 131 and Co – 60
(d) I – 131 and Co – 61
Q. 9. The isotope of uranium used as a fuel in nuclear reactors and carbon used in radiocarbon dating are : –
(a) U – 233 and C – 14
(b) U – 235 and C – 13
(c) U – 233 and C
(d) U – 235 and C
Q.10. Elements with valency 1 are :
(a) always metals
(b) always metalloids
(c) either metals or non-metals
(d) always non-metals
Q.11. The first model of an atom was given by :
(a) N.Bohr
(b) E.Goldstein
(c) Rutherford
(d) J.J.Thomson
Q.12. An atom with 3 protons and 4 neutrons will have a valency of:
(a) 3
(b) 7
(c) 1
(d) 4
Q.13. The electron distribution in an aluminium atom is :
(a) 2, 8, 3
(b) 2, 8, 2
(c) 8, 2, 3
(d) 2, 3, 8
Q.14. According to Bohr-Bury scheme, the maximum number of electrons which can be accommodated in a given shell is given by the formula:
(a) 2n²
(b) n²
(c) 3n²
(d) 2n
Q.15. The nucleus of hydrogen atom is known as:
(a) Proton
(b) Positron
(c) Nucleon
(d) Neutrino
Q.16. Which of the following statements about Rutherford’s model of atom are correct ?
(i) Considered the nucleus as positively charged.
(ii) Established that the a-particles are four times as heavy as a hydrogen atom
(iii) Can be compared to solar system
(iv) Was in agreement with Thomson’s model
(a) (i) and (iii)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) only (i)
Q.17. Which of the following are true for an element ?
(i) Atomic number number of protons + number of electrons
(ii) Mass number neutrons = number of protons + number of
(iii) Atomic mass = neutrons number of protons = number of
(iv) Atomic number of electrons = number of protons = number
(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (ii) and (iv)
Q.18. Atomic models have been improved over the years. Arrange the following atomic models in the order of their chronological order :
(i) Rutherford’s atomic model
(ii) Thomson’s atomic model
(iii) Bohr’s atomic model
(a) (i), (ii) and (iii)
(b) (ii), (iii) and (i)
(c) (ii), (i) and (iii)
(d) (iii), (ii) and (i)
Q.19. The presence of protons and neutrons at the centre of the atom was suggested by :
(a) Protons by J.Chadwick and neutrons by J.J. Thomson
(b) Protons by E.Goldstein and neutrons by J. Chadwick
(c) Protons by E.Goldstein and neutrons by J.J. Thomson
(d) Protons by J.Chadwick and neutrons by E.Goldstein
Q.20. The presence of electrons outside the nucleus and nucleus at the centre of the atom was suggested by :
(a) Electrons by J.J.Thomson and nucleus by E.Goldstein
(b) Electrons by J.Chadwick and nucleus by E. Rutherford
(c) Electrons by J.J.Thomson and nucleus by E.Rutherford
(d) Electrons by E.Rutherford and nucleus by J.J.Thomson
Q.21. Dalton’s atomic theory successfully explained :
(i) Law of conservation of mass
(ii) Law of constant composition
(iii) Law of radioactivity.
(iv) Law of multiple proportion.
(a) (i), (ii) and (iii)
(b) (i), (iii) and (iv)
(c) (ii), (iii) and (iv)
(d) (i), (ii) and (iv)
Q.22. The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion ?
(a) 13
(b) 10
(c) 14
(d) 16
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