Chemistry
1. The main draw back of Bohr model of atom is ……………
(a) it does not explain the stability of the atom
(b) it does not explain the atomic spectrum of hydrogen
(c) all species containing one electron are treated by Bohr model
(d) the concept of stationary state is not acceptable
2. In the Sommerfeld model of an atom, electrons move in ……………
(a) circular orbits only
(b) elliptical orbits only
(c) both in elliptial and in circular orbits
(d) the first orbit alone is elliptical while the rest are circular
3. Which is a correct statement? ………………
(a) Electron can be regarded as a particle and as wave
(b) Schrödinger considered the electron as two dimensional wave in the
electric field of the nucleus
(c) an orbital is a circular path in which the electron is revolving round the
nucleus
(d) an orbit can contain a maximum of two electrons
4. A mathematical equation to describe the behaviour of electron waves was
developed by …………….
(a) Pauli (b) Heisenberg
(c) Schrödinger (d) Bohr
5. The space where the electron spends most of the time is known as …………
(a) orbit (b) sub shell
(c) orbital (d) nucleus
6. The total number of electrons present in an orbit is 18. it is …………… orbit
(a) K (b) L
(c) M (d) N
7. Proton was discovered by …………….
(a) J.J. Thomson (b) Goldstein
(c) Chadwick (d) Neils Bohr
, 8. Major energy level is indicated by ……………. quantum number
(a) Principal (b) azimuthal
(c) magnetic (d) spin
9. The principal quantum number cannot have the value ………………
(a) 1 (b) 2
(c) 0 (d) 3
10. An electron has the highest energy, if it is present in a shell ……………
(a) K (b) L
(c) M (d) N
11. The correct values for ‘l’ for the value of n = 3 are …………………
(a) 0, 0, 0 (b) 0, 1, 2
(c) 0, 1 (d) 1, 2, 3
12. The subshell which is denoted by l = 1 is designated by …………..
(a) s (b) p
(c) d (d) f
13. A subshell is denoted by n = 3, l = 2. It is designated by ………………
(a) 3s (b) 3p
(c) 3d (d) 2p
14. For a 4f subshell, the values of n, and l are respectively
(a) 4, 1 (b) 4, 0
(c) 4, 2 (d) 4, 3
15. The maximum value of ‘l’ for n = 3 is …………………
(a) 3 (b) 2
(c) 1 (d) 4
1. The main draw back of Bohr model of atom is ……………
(a) it does not explain the stability of the atom
(b) it does not explain the atomic spectrum of hydrogen
(c) all species containing one electron are treated by Bohr model
(d) the concept of stationary state is not acceptable
2. In the Sommerfeld model of an atom, electrons move in ……………
(a) circular orbits only
(b) elliptical orbits only
(c) both in elliptial and in circular orbits
(d) the first orbit alone is elliptical while the rest are circular
3. Which is a correct statement? ………………
(a) Electron can be regarded as a particle and as wave
(b) Schrödinger considered the electron as two dimensional wave in the
electric field of the nucleus
(c) an orbital is a circular path in which the electron is revolving round the
nucleus
(d) an orbit can contain a maximum of two electrons
4. A mathematical equation to describe the behaviour of electron waves was
developed by …………….
(a) Pauli (b) Heisenberg
(c) Schrödinger (d) Bohr
5. The space where the electron spends most of the time is known as …………
(a) orbit (b) sub shell
(c) orbital (d) nucleus
6. The total number of electrons present in an orbit is 18. it is …………… orbit
(a) K (b) L
(c) M (d) N
7. Proton was discovered by …………….
(a) J.J. Thomson (b) Goldstein
(c) Chadwick (d) Neils Bohr
, 8. Major energy level is indicated by ……………. quantum number
(a) Principal (b) azimuthal
(c) magnetic (d) spin
9. The principal quantum number cannot have the value ………………
(a) 1 (b) 2
(c) 0 (d) 3
10. An electron has the highest energy, if it is present in a shell ……………
(a) K (b) L
(c) M (d) N
11. The correct values for ‘l’ for the value of n = 3 are …………………
(a) 0, 0, 0 (b) 0, 1, 2
(c) 0, 1 (d) 1, 2, 3
12. The subshell which is denoted by l = 1 is designated by …………..
(a) s (b) p
(c) d (d) f
13. A subshell is denoted by n = 3, l = 2. It is designated by ………………
(a) 3s (b) 3p
(c) 3d (d) 2p
14. For a 4f subshell, the values of n, and l are respectively
(a) 4, 1 (b) 4, 0
(c) 4, 2 (d) 4, 3
15. The maximum value of ‘l’ for n = 3 is …………………
(a) 3 (b) 2
(c) 1 (d) 4
