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Page 1
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009
Mob.011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com
ATOMIC STRUCTURE
OBJECTIVE QUESTION
1. The ratio of e/m for a cathode ray:
(a) Varies with a gas in a discharge tube (b) Is fixed
(c) Varies with different electrodes (d) Is maximum if hydrogen is taken
2. Which of the following statements is wrong about cathode rays?
(a) They travel in straight lines towards cathode.
(b) They produce heating effect.
(c) They carry negative charge.
(d) They produce X-rays when strike with material having high atomic masses.
3. Cathode rays are:
(a) Electromagnetic waves (b) stream of a- particles
(c) Stream of electrons (d) radiations
4. Energy of Bohr orbit:
(a) Increases as we move away from the nucleus
(b) Decreases as we move away from the nucleus
(c) Remains the same as we move away from the nucleus
(d) None of the above
5. Which of the following statements does not form part of Bohr’s model of the hydrogen
atom?
(a) Energy of the electron in the orbit is quantized
(b) The electron in the orbit nearest to the nucleus has the lowest energy.
(c) Electrons revolve in different orbit nucleus.
(d) The position and velocity of the electron in the orbit cannot be determined
simultaneously.
6. Which of the following statements does not form a part of Bohr’s model of hydrogen
atom?
(a) Energy of the electrons in the orbit is quantized.
(b) The electron in the orbit nearest to the nucleus has the lowest energy.
(c) Electrons revolve in different orbits around the nucleus.
(d) The positions and velocity of the electrons in the orbit cannot be determined
simultaneously.
7. The radius of the first orbit of H-atom is r. Then the radius of the first orbit of Li
2+
will be:
(a)
9
r
(b)
3
r
(c) 3r (d) 9r
Page 2
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009
Mob.011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com
ATOMIC STRUCTURE
OBJECTIVE QUESTION
1. The ratio of e/m for a cathode ray:
(a) Varies with a gas in a discharge tube (b) Is fixed
(c) Varies with different electrodes (d) Is maximum if hydrogen is taken
2. Which of the following statements is wrong about cathode rays?
(a) They travel in straight lines towards cathode.
(b) They produce heating effect.
(c) They carry negative charge.
(d) They produce X-rays when strike with material having high atomic masses.
3. Cathode rays are:
(a) Electromagnetic waves (b) stream of a- particles
(c) Stream of electrons (d) radiations
4. Energy of Bohr orbit:
(a) Increases as we move away from the nucleus
(b) Decreases as we move away from the nucleus
(c) Remains the same as we move away from the nucleus
(d) None of the above
5. Which of the following statements does not form part of Bohr’s model of the hydrogen
atom?
(a) Energy of the electron in the orbit is quantized
(b) The electron in the orbit nearest to the nucleus has the lowest energy.
(c) Electrons revolve in different orbit nucleus.
(d) The position and velocity of the electron in the orbit cannot be determined
simultaneously.
6. Which of the following statements does not form a part of Bohr’s model of hydrogen
atom?
(a) Energy of the electrons in the orbit is quantized.
(b) The electron in the orbit nearest to the nucleus has the lowest energy.
(c) Electrons revolve in different orbits around the nucleus.
(d) The positions and velocity of the electrons in the orbit cannot be determined
simultaneously.
7. The radius of the first orbit of H-atom is r. Then the radius of the first orbit of Li
2+
will be:
(a)
9
r
(b)
3
r
(c) 3r (d) 9r
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009
Mob.011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com
8. The energy liberated when an excited electron returns to its ground state can have:
(a) Any value from zero to infinity (b) Only negative values
(c) Only specified positive values (d) None of the above
9. On the basis of Bohr’s model, the radius of the 3
rd
orbit is:
(a) Equal to the radius of first orbit (b) Three times the radius of first orbit
(c) Five times the radius of first orbit (d) Nine times the radius of first orbit
10. The ratio of 2
nd
, 4
th
and 6
th
orbits of hydrogen atom is
(a) 2:4:6 (b) 1:4:9 (c) 1:4:6 (d) 1:2:3
11. The frequency of a green light is 6 x 10
14
Hz. Its wavelength is
(a) 500 nm (b) 5 nm (c) 5000 nm (d) none of these
[Hint: 1 nm = 10
-9
m]
12. The ratio of energy of a photon of 2000 Å wavelength radiation to that of 4000 Å
radiation is
(a) ¼ (b) 4 (c) ½ (d) 2
13. The values of charge on the oil droplets experimentally observed were – 1.6 x 10
-19
, -
2.4 x 10
-19
and - 4 x 10
-19
coulomb. The value of the electronic charge, indicated by these
results is
(a) – 1.6 x 10
-19
(b) – 2.4 x 10
-19
(c) – 4 x 10
-19
(d) – 0.8 x 10
-19
[Hint: Find the highest common factor.]
14. Which of the following statements is/are correct?
(a) A photon is a positively charged nuclear particle.
(b) A photon is a particle of light energy.
(c) A photon is a quantum of light.
(d) A photon is a bundle of energy of definite magnitudes but not necessarily light
energy.
15. For which of the following species, Bohr theory does not apply?
(a) H (b) H
+
(c) He
+
(d) Li
2+
16. The radius of the first Bohr orbit of hydrogen atom is r. The radius of the 3
rd
orbit would
be
(a) 3r (b) 9r (c) 27r (d) none of these
17. The electronic velocity in the fourth Bohr orbit of hydrogen is ? . The velocity of the
electron is the first orbit would be
(a) 4 ? (b) 16 ? (c) ? /4 (d) ? /16
18. The ionization potential of hydrogen atom is 13.6 eV. The energy required to remove an
electron in the n = 2 state of hydrogen atom is
Page 3
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009
Mob.011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com
ATOMIC STRUCTURE
OBJECTIVE QUESTION
1. The ratio of e/m for a cathode ray:
(a) Varies with a gas in a discharge tube (b) Is fixed
(c) Varies with different electrodes (d) Is maximum if hydrogen is taken
2. Which of the following statements is wrong about cathode rays?
(a) They travel in straight lines towards cathode.
(b) They produce heating effect.
(c) They carry negative charge.
(d) They produce X-rays when strike with material having high atomic masses.
3. Cathode rays are:
(a) Electromagnetic waves (b) stream of a- particles
(c) Stream of electrons (d) radiations
4. Energy of Bohr orbit:
(a) Increases as we move away from the nucleus
(b) Decreases as we move away from the nucleus
(c) Remains the same as we move away from the nucleus
(d) None of the above
5. Which of the following statements does not form part of Bohr’s model of the hydrogen
atom?
(a) Energy of the electron in the orbit is quantized
(b) The electron in the orbit nearest to the nucleus has the lowest energy.
(c) Electrons revolve in different orbit nucleus.
(d) The position and velocity of the electron in the orbit cannot be determined
simultaneously.
6. Which of the following statements does not form a part of Bohr’s model of hydrogen
atom?
(a) Energy of the electrons in the orbit is quantized.
(b) The electron in the orbit nearest to the nucleus has the lowest energy.
(c) Electrons revolve in different orbits around the nucleus.
(d) The positions and velocity of the electrons in the orbit cannot be determined
simultaneously.
7. The radius of the first orbit of H-atom is r. Then the radius of the first orbit of Li
2+
will be:
(a)
9
r
(b)
3
r
(c) 3r (d) 9r
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009
Mob.011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com
8. The energy liberated when an excited electron returns to its ground state can have:
(a) Any value from zero to infinity (b) Only negative values
(c) Only specified positive values (d) None of the above
9. On the basis of Bohr’s model, the radius of the 3
rd
orbit is:
(a) Equal to the radius of first orbit (b) Three times the radius of first orbit
(c) Five times the radius of first orbit (d) Nine times the radius of first orbit
10. The ratio of 2
nd
, 4
th
and 6
th
orbits of hydrogen atom is
(a) 2:4:6 (b) 1:4:9 (c) 1:4:6 (d) 1:2:3
11. The frequency of a green light is 6 x 10
14
Hz. Its wavelength is
(a) 500 nm (b) 5 nm (c) 5000 nm (d) none of these
[Hint: 1 nm = 10
-9
m]
12. The ratio of energy of a photon of 2000 Å wavelength radiation to that of 4000 Å
radiation is
(a) ¼ (b) 4 (c) ½ (d) 2
13. The values of charge on the oil droplets experimentally observed were – 1.6 x 10
-19
, -
2.4 x 10
-19
and - 4 x 10
-19
coulomb. The value of the electronic charge, indicated by these
results is
(a) – 1.6 x 10
-19
(b) – 2.4 x 10
-19
(c) – 4 x 10
-19
(d) – 0.8 x 10
-19
[Hint: Find the highest common factor.]
14. Which of the following statements is/are correct?
(a) A photon is a positively charged nuclear particle.
(b) A photon is a particle of light energy.
(c) A photon is a quantum of light.
(d) A photon is a bundle of energy of definite magnitudes but not necessarily light
energy.
15. For which of the following species, Bohr theory does not apply?
(a) H (b) H
+
(c) He
+
(d) Li
2+
16. The radius of the first Bohr orbit of hydrogen atom is r. The radius of the 3
rd
orbit would
be
(a) 3r (b) 9r (c) 27r (d) none of these
17. The electronic velocity in the fourth Bohr orbit of hydrogen is ? . The velocity of the
electron is the first orbit would be
(a) 4 ? (b) 16 ? (c) ? /4 (d) ? /16
18. The ionization potential of hydrogen atom is 13.6 eV. The energy required to remove an
electron in the n = 2 state of hydrogen atom is
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009
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(a) 27.2 eV (b)13.6 eV (c)6.8 eV (d) 3.4 eV
19. The energy of the second Bohr orbit in the hydrogen atom is – 3.41 eV. The energy of
the second Bohr orbit of He
+
ion would be
(a) – 0.85 eV (b) – 13.64 eV (c) – 1.70 eV (d) – 6.82 eV
20. The ratio of the radii of the first three Bohr orbits is
(a) 1:5:33 (b) 1:2:3 (c) 1:4:9 (d) 1:8:27
21. The ratio of the difference in energy between the first and second Bohr orbits to that
between the second and third Bohr orbit is
(a) ½ (b) 1/3 (c) 4/9 (d) 27/5
22. For l = 3, which value of m is not possible?
(a) 4 (b) 0 (c) -3 (d) -1
23. The designation of an orbital with n = 4 and l = 1, is
(a) 4d (b) 4s (c) 4f (d) 4p
24. Which of the following orbitals is meaningless?
(a) 6f (b) 2d (c) 7s (d) 3d
25. Which of the following sets of quantum numbers is possible for an electron in a 4f
orbital
(a) n = 4, l = 2, m = 2, s = +
1
2
(b) n = 4, l = 4, m = +4, s = +
1
2
(a) n = 4, l = 3, m = +1, s = -
1
2
(b) n = 4, l = 3, m = 4, s = +
1
2
26. The maximum number of electrons in an atom with quantum numbers n = 3, l = 2 is
(a) 2 (b) 6 (c) 10 (d) 30
27. The number of orbitals in n = 3 are
(a) 1 (b) 4 (c) 9 (d) 16
28. If the nitrogen atom had electronic configuration 1s
7
, it would have energy lower than
that of the normal ground state configuration 1s
1
, 2s
2
2p
3
, because the electrons would
be closer to the nucleus. Yet, 1s
7
is not observed because it violates
(a) Heisenberg uncertainty principle
(b) Hund Rule
(c) Pauli exclusion principle
(d) Bohr postulate of stationary orbits
29. Rutherford’s experiment, which establishes the nuclear model of the atom, used a beam of
(a) ß-particles, which impinged on a metal foil and got absorbed
(b) ?-rays, which impinged on a metal foil and ejected electrons
(c) Helium atoms, which impinged on a metal foil and got scattered
Page 4
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009
Mob.011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com
ATOMIC STRUCTURE
OBJECTIVE QUESTION
1. The ratio of e/m for a cathode ray:
(a) Varies with a gas in a discharge tube (b) Is fixed
(c) Varies with different electrodes (d) Is maximum if hydrogen is taken
2. Which of the following statements is wrong about cathode rays?
(a) They travel in straight lines towards cathode.
(b) They produce heating effect.
(c) They carry negative charge.
(d) They produce X-rays when strike with material having high atomic masses.
3. Cathode rays are:
(a) Electromagnetic waves (b) stream of a- particles
(c) Stream of electrons (d) radiations
4. Energy of Bohr orbit:
(a) Increases as we move away from the nucleus
(b) Decreases as we move away from the nucleus
(c) Remains the same as we move away from the nucleus
(d) None of the above
5. Which of the following statements does not form part of Bohr’s model of the hydrogen
atom?
(a) Energy of the electron in the orbit is quantized
(b) The electron in the orbit nearest to the nucleus has the lowest energy.
(c) Electrons revolve in different orbit nucleus.
(d) The position and velocity of the electron in the orbit cannot be determined
simultaneously.
6. Which of the following statements does not form a part of Bohr’s model of hydrogen
atom?
(a) Energy of the electrons in the orbit is quantized.
(b) The electron in the orbit nearest to the nucleus has the lowest energy.
(c) Electrons revolve in different orbits around the nucleus.
(d) The positions and velocity of the electrons in the orbit cannot be determined
simultaneously.
7. The radius of the first orbit of H-atom is r. Then the radius of the first orbit of Li
2+
will be:
(a)
9
r
(b)
3
r
(c) 3r (d) 9r
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009
Mob.011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com
8. The energy liberated when an excited electron returns to its ground state can have:
(a) Any value from zero to infinity (b) Only negative values
(c) Only specified positive values (d) None of the above
9. On the basis of Bohr’s model, the radius of the 3
rd
orbit is:
(a) Equal to the radius of first orbit (b) Three times the radius of first orbit
(c) Five times the radius of first orbit (d) Nine times the radius of first orbit
10. The ratio of 2
nd
, 4
th
and 6
th
orbits of hydrogen atom is
(a) 2:4:6 (b) 1:4:9 (c) 1:4:6 (d) 1:2:3
11. The frequency of a green light is 6 x 10
14
Hz. Its wavelength is
(a) 500 nm (b) 5 nm (c) 5000 nm (d) none of these
[Hint: 1 nm = 10
-9
m]
12. The ratio of energy of a photon of 2000 Å wavelength radiation to that of 4000 Å
radiation is
(a) ¼ (b) 4 (c) ½ (d) 2
13. The values of charge on the oil droplets experimentally observed were – 1.6 x 10
-19
, -
2.4 x 10
-19
and - 4 x 10
-19
coulomb. The value of the electronic charge, indicated by these
results is
(a) – 1.6 x 10
-19
(b) – 2.4 x 10
-19
(c) – 4 x 10
-19
(d) – 0.8 x 10
-19
[Hint: Find the highest common factor.]
14. Which of the following statements is/are correct?
(a) A photon is a positively charged nuclear particle.
(b) A photon is a particle of light energy.
(c) A photon is a quantum of light.
(d) A photon is a bundle of energy of definite magnitudes but not necessarily light
energy.
15. For which of the following species, Bohr theory does not apply?
(a) H (b) H
+
(c) He
+
(d) Li
2+
16. The radius of the first Bohr orbit of hydrogen atom is r. The radius of the 3
rd
orbit would
be
(a) 3r (b) 9r (c) 27r (d) none of these
17. The electronic velocity in the fourth Bohr orbit of hydrogen is ? . The velocity of the
electron is the first orbit would be
(a) 4 ? (b) 16 ? (c) ? /4 (d) ? /16
18. The ionization potential of hydrogen atom is 13.6 eV. The energy required to remove an
electron in the n = 2 state of hydrogen atom is
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009
Mob.011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com
(a) 27.2 eV (b)13.6 eV (c)6.8 eV (d) 3.4 eV
19. The energy of the second Bohr orbit in the hydrogen atom is – 3.41 eV. The energy of
the second Bohr orbit of He
+
ion would be
(a) – 0.85 eV (b) – 13.64 eV (c) – 1.70 eV (d) – 6.82 eV
20. The ratio of the radii of the first three Bohr orbits is
(a) 1:5:33 (b) 1:2:3 (c) 1:4:9 (d) 1:8:27
21. The ratio of the difference in energy between the first and second Bohr orbits to that
between the second and third Bohr orbit is
(a) ½ (b) 1/3 (c) 4/9 (d) 27/5
22. For l = 3, which value of m is not possible?
(a) 4 (b) 0 (c) -3 (d) -1
23. The designation of an orbital with n = 4 and l = 1, is
(a) 4d (b) 4s (c) 4f (d) 4p
24. Which of the following orbitals is meaningless?
(a) 6f (b) 2d (c) 7s (d) 3d
25. Which of the following sets of quantum numbers is possible for an electron in a 4f
orbital
(a) n = 4, l = 2, m = 2, s = +
1
2
(b) n = 4, l = 4, m = +4, s = +
1
2
(a) n = 4, l = 3, m = +1, s = -
1
2
(b) n = 4, l = 3, m = 4, s = +
1
2
26. The maximum number of electrons in an atom with quantum numbers n = 3, l = 2 is
(a) 2 (b) 6 (c) 10 (d) 30
27. The number of orbitals in n = 3 are
(a) 1 (b) 4 (c) 9 (d) 16
28. If the nitrogen atom had electronic configuration 1s
7
, it would have energy lower than
that of the normal ground state configuration 1s
1
, 2s
2
2p
3
, because the electrons would
be closer to the nucleus. Yet, 1s
7
is not observed because it violates
(a) Heisenberg uncertainty principle
(b) Hund Rule
(c) Pauli exclusion principle
(d) Bohr postulate of stationary orbits
29. Rutherford’s experiment, which establishes the nuclear model of the atom, used a beam of
(a) ß-particles, which impinged on a metal foil and got absorbed
(b) ?-rays, which impinged on a metal foil and ejected electrons
(c) Helium atoms, which impinged on a metal foil and got scattered
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009
Mob.011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com
(d) Helium nuclei, which impinged on a metal foil and got scattered
30. The total number of nodal planes are same in
(a) 3s, 4d (b) 4s, 3p (c) 5s, 4d (d) 4s, 4p
31. The number of waves made by an electron moving in an orbit having maximum
quantum number (m) +3 is
(a) 3 (b) 4 (c) 5 (d) 6
[Hint: l = 3 and n = 4]
32. The electronic transition from n = 2 to n = 1 will produce shortest wavelength in
(a) Li
2+
(b) He
+
(c) H (d) H
+
33. The first emission line of Balmer series in He
+
- spectrum has the wave no. in cm
-1
equal
to (R- Rydberg constant)
(a)
3
4
R
(b)
20
36
R
(c)
5
36
R
(d)
6
R
34. If the radius of the first Bohr orbit is r, the wavelength of an electron in the third orbit of
a hydrogen atom is equal to
(a) 6 ? r (b) 2 ? r (c) 9 ? r (d) 3r
35. If the shortest ? of hydrogen atom in Lyman series isx , the longest ? in Balmer series of
He
+
is
(a)
4
x
(b)
5
9
x
(c)
6
5
x
(d)
9
5
x
36. Consider a large number of hydrogen atoms with electrons randomly distributed in the
n = 1, 2, 3, and 4 orbits, How many different wavelengths of light are emitted by these
atoms as the electrons fall into lower energy orbits.
(a) 1 (b) 3 (c) 6 (d) 9
37. How many times larger is a hydrogen atom than the radius of an H atom in its ground
state if the H atom with an electron characterized by a quantum number of 106?
(a) 106 (b) 212 (c) 11236 (d) none of these
38. Which is larger, an He
+
ion with an electron in an orbit with n = 3 or an Li
2+
ion with an
electron in an orbit with n = 5?
(a) He
+
(b) Li
2+
(c) both equal (d) none of these
39. Which of the following sets of quantum numbers is permissible for an electron in an
atom?
(a) n = 1, l = 1, m = 0, s = +
1
2
(b) n = 3, l = 1, m = -2, s = -
1
2
Page 5
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009
Mob.011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com
ATOMIC STRUCTURE
OBJECTIVE QUESTION
1. The ratio of e/m for a cathode ray:
(a) Varies with a gas in a discharge tube (b) Is fixed
(c) Varies with different electrodes (d) Is maximum if hydrogen is taken
2. Which of the following statements is wrong about cathode rays?
(a) They travel in straight lines towards cathode.
(b) They produce heating effect.
(c) They carry negative charge.
(d) They produce X-rays when strike with material having high atomic masses.
3. Cathode rays are:
(a) Electromagnetic waves (b) stream of a- particles
(c) Stream of electrons (d) radiations
4. Energy of Bohr orbit:
(a) Increases as we move away from the nucleus
(b) Decreases as we move away from the nucleus
(c) Remains the same as we move away from the nucleus
(d) None of the above
5. Which of the following statements does not form part of Bohr’s model of the hydrogen
atom?
(a) Energy of the electron in the orbit is quantized
(b) The electron in the orbit nearest to the nucleus has the lowest energy.
(c) Electrons revolve in different orbit nucleus.
(d) The position and velocity of the electron in the orbit cannot be determined
simultaneously.
6. Which of the following statements does not form a part of Bohr’s model of hydrogen
atom?
(a) Energy of the electrons in the orbit is quantized.
(b) The electron in the orbit nearest to the nucleus has the lowest energy.
(c) Electrons revolve in different orbits around the nucleus.
(d) The positions and velocity of the electrons in the orbit cannot be determined
simultaneously.
7. The radius of the first orbit of H-atom is r. Then the radius of the first orbit of Li
2+
will be:
(a)
9
r
(b)
3
r
(c) 3r (d) 9r
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009
Mob.011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com
8. The energy liberated when an excited electron returns to its ground state can have:
(a) Any value from zero to infinity (b) Only negative values
(c) Only specified positive values (d) None of the above
9. On the basis of Bohr’s model, the radius of the 3
rd
orbit is:
(a) Equal to the radius of first orbit (b) Three times the radius of first orbit
(c) Five times the radius of first orbit (d) Nine times the radius of first orbit
10. The ratio of 2
nd
, 4
th
and 6
th
orbits of hydrogen atom is
(a) 2:4:6 (b) 1:4:9 (c) 1:4:6 (d) 1:2:3
11. The frequency of a green light is 6 x 10
14
Hz. Its wavelength is
(a) 500 nm (b) 5 nm (c) 5000 nm (d) none of these
[Hint: 1 nm = 10
-9
m]
12. The ratio of energy of a photon of 2000 Å wavelength radiation to that of 4000 Å
radiation is
(a) ¼ (b) 4 (c) ½ (d) 2
13. The values of charge on the oil droplets experimentally observed were – 1.6 x 10
-19
, -
2.4 x 10
-19
and - 4 x 10
-19
coulomb. The value of the electronic charge, indicated by these
results is
(a) – 1.6 x 10
-19
(b) – 2.4 x 10
-19
(c) – 4 x 10
-19
(d) – 0.8 x 10
-19
[Hint: Find the highest common factor.]
14. Which of the following statements is/are correct?
(a) A photon is a positively charged nuclear particle.
(b) A photon is a particle of light energy.
(c) A photon is a quantum of light.
(d) A photon is a bundle of energy of definite magnitudes but not necessarily light
energy.
15. For which of the following species, Bohr theory does not apply?
(a) H (b) H
+
(c) He
+
(d) Li
2+
16. The radius of the first Bohr orbit of hydrogen atom is r. The radius of the 3
rd
orbit would
be
(a) 3r (b) 9r (c) 27r (d) none of these
17. The electronic velocity in the fourth Bohr orbit of hydrogen is ? . The velocity of the
electron is the first orbit would be
(a) 4 ? (b) 16 ? (c) ? /4 (d) ? /16
18. The ionization potential of hydrogen atom is 13.6 eV. The energy required to remove an
electron in the n = 2 state of hydrogen atom is
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(a) 27.2 eV (b)13.6 eV (c)6.8 eV (d) 3.4 eV
19. The energy of the second Bohr orbit in the hydrogen atom is – 3.41 eV. The energy of
the second Bohr orbit of He
+
ion would be
(a) – 0.85 eV (b) – 13.64 eV (c) – 1.70 eV (d) – 6.82 eV
20. The ratio of the radii of the first three Bohr orbits is
(a) 1:5:33 (b) 1:2:3 (c) 1:4:9 (d) 1:8:27
21. The ratio of the difference in energy between the first and second Bohr orbits to that
between the second and third Bohr orbit is
(a) ½ (b) 1/3 (c) 4/9 (d) 27/5
22. For l = 3, which value of m is not possible?
(a) 4 (b) 0 (c) -3 (d) -1
23. The designation of an orbital with n = 4 and l = 1, is
(a) 4d (b) 4s (c) 4f (d) 4p
24. Which of the following orbitals is meaningless?
(a) 6f (b) 2d (c) 7s (d) 3d
25. Which of the following sets of quantum numbers is possible for an electron in a 4f
orbital
(a) n = 4, l = 2, m = 2, s = +
1
2
(b) n = 4, l = 4, m = +4, s = +
1
2
(a) n = 4, l = 3, m = +1, s = -
1
2
(b) n = 4, l = 3, m = 4, s = +
1
2
26. The maximum number of electrons in an atom with quantum numbers n = 3, l = 2 is
(a) 2 (b) 6 (c) 10 (d) 30
27. The number of orbitals in n = 3 are
(a) 1 (b) 4 (c) 9 (d) 16
28. If the nitrogen atom had electronic configuration 1s
7
, it would have energy lower than
that of the normal ground state configuration 1s
1
, 2s
2
2p
3
, because the electrons would
be closer to the nucleus. Yet, 1s
7
is not observed because it violates
(a) Heisenberg uncertainty principle
(b) Hund Rule
(c) Pauli exclusion principle
(d) Bohr postulate of stationary orbits
29. Rutherford’s experiment, which establishes the nuclear model of the atom, used a beam of
(a) ß-particles, which impinged on a metal foil and got absorbed
(b) ?-rays, which impinged on a metal foil and ejected electrons
(c) Helium atoms, which impinged on a metal foil and got scattered
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(d) Helium nuclei, which impinged on a metal foil and got scattered
30. The total number of nodal planes are same in
(a) 3s, 4d (b) 4s, 3p (c) 5s, 4d (d) 4s, 4p
31. The number of waves made by an electron moving in an orbit having maximum
quantum number (m) +3 is
(a) 3 (b) 4 (c) 5 (d) 6
[Hint: l = 3 and n = 4]
32. The electronic transition from n = 2 to n = 1 will produce shortest wavelength in
(a) Li
2+
(b) He
+
(c) H (d) H
+
33. The first emission line of Balmer series in He
+
- spectrum has the wave no. in cm
-1
equal
to (R- Rydberg constant)
(a)
3
4
R
(b)
20
36
R
(c)
5
36
R
(d)
6
R
34. If the radius of the first Bohr orbit is r, the wavelength of an electron in the third orbit of
a hydrogen atom is equal to
(a) 6 ? r (b) 2 ? r (c) 9 ? r (d) 3r
35. If the shortest ? of hydrogen atom in Lyman series isx , the longest ? in Balmer series of
He
+
is
(a)
4
x
(b)
5
9
x
(c)
6
5
x
(d)
9
5
x
36. Consider a large number of hydrogen atoms with electrons randomly distributed in the
n = 1, 2, 3, and 4 orbits, How many different wavelengths of light are emitted by these
atoms as the electrons fall into lower energy orbits.
(a) 1 (b) 3 (c) 6 (d) 9
37. How many times larger is a hydrogen atom than the radius of an H atom in its ground
state if the H atom with an electron characterized by a quantum number of 106?
(a) 106 (b) 212 (c) 11236 (d) none of these
38. Which is larger, an He
+
ion with an electron in an orbit with n = 3 or an Li
2+
ion with an
electron in an orbit with n = 5?
(a) He
+
(b) Li
2+
(c) both equal (d) none of these
39. Which of the following sets of quantum numbers is permissible for an electron in an
atom?
(a) n = 1, l = 1, m = 0, s = +
1
2
(b) n = 3, l = 1, m = -2, s = -
1
2
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(a) n = 2, l = 1, m = 0, s = +
1
2
(b) n = 2, l = 0, m = 0, s = 1
40. Number of stable isotopes is least when the number of neutrons and that of protons in
the isotopes are respectively
(a) odd and odd (b) even and odd
(c) odd and even (d) even and even
41. A radioactive nuclide generally disintegrates by a- emission when its N/P ratio is
(a) less than 1 (b) equal to 1 (c) equal to 1.2 (d) greater than 1.5
42.
8
x
X atom is isotone to
17
9
Y atom. The value of x is
(a) 8 (b) 16 (c) 9 (d) 17
43. If 5 g of a radioactive substance has a
1
2
t
= 14 h, 20 g of the same substance will have a
1
2
t
equal to
(a) 56 h (b) 3.5 h (c) 14 h (d) 28 h
44. The designations of a proton and neutron are
1
1
H and
1
0
n respectively. Are the two
particles of equal mass?
(a) yes, both proton and neutron have the same mass, i.e., 1 amu.
(b) No, mass numbers reflect actual masses only to the nearest amu. The precise masses
of proton and neutron are 1.00722765 and 1.0086656 amu.
45. The nuclides
40
18
Ar and
41
19
K are
(a) isotopes (b) isobars (c) isotones (d) none of these
46. Which of the following nuclides are isobars?
(a)
40
21
Sc and
42
21
Sc (b)
40
18
Ar and
40
21
Sc
(c)
40
18
Ar and
41
19
K (d) none of these
47. To what stable isotope would
257
103
Lr decay?
(a)
208
82
Pb (b)
209
83
Bi (c)
206
82
Pb (d)
207
82
Pb
48. The half-life of a radioactive isotope is 1.5 hours. The mass of it that remains undecayed
after 6 hours is ( if the initial mass of the isotope was 32 g)
(a) 32 g (b) 16 g (c) 4 g (d) 2 g
49. The radioactivity due to C-14 isotope (t 1/2 = 6000 yr) of a sample of wood from an
ancient tomb was found to be nearly half that of fresh wood; the tomb is therefore,
about
(a) 3000 years old (b) 6000 years old
(c) 9000 years old (d) 12000 years old
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FAQs on Atomic structure - Additional Documents & Tests for IIT JAM
| 1. What is atomic structure in the context of IIT JAM? |  |
| 2. How does the understanding of atomic structure help in cracking IIT JAM? | |
Ans. Understanding atomic structure is crucial for cracking IIT JAM as it forms the foundation of various concepts in physics and chemistry. It helps in understanding the behavior of elements, their chemical properties, and their reactions. Knowledge of atomic structure is also important for topics like spectroscopy, molecular orbital theory, and quantum mechanics, which are frequently asked in the IIT JAM exam.
| 3. What are the key subtopics related to atomic structure in the IIT JAM syllabus? | |
Ans. The key subtopics related to atomic structure in the IIT JAM syllabus include:
1. Atomic models: Bohr's model, quantum mechanical model.
2. Quantum numbers: Principal quantum number, azimuthal quantum number, magnetic quantum number, and spin quantum number.
3. Electron configurations: Aufbau principle, Hund's rule, Pauli exclusion principle.
4. Periodic table: Trends in periodic properties like atomic radius, ionization energy, electron affinity, and electronegativity.
| 4. How can I prepare effectively for the atomic structure section in IIT JAM? | |
Ans. To prepare effectively for the atomic structure section in IIT JAM, you can follow these tips:
1. Understand the basic concepts: Start by building a strong foundation in atomic structure by understanding the fundamental concepts, such as electron orbitals, energy levels, and quantum numbers.
2. Practice numerical problems: Solve a variety of numerical problems to gain proficiency in calculations related to atomic structure, such as determining electron configurations, energy levels, and atomic properties.
3. Study the periodic table: Familiarize yourself with the periodic table and understand the trends in atomic properties. Pay attention to the variations in atomic radius, ionization energy, electron affinity, and electronegativity across different elements.
4. Refer to standard textbooks: Make use of standard textbooks recommended for IIT JAM preparation to study the topic in depth and practice solved examples and exercises.
5. Take mock tests: Regularly take mock tests and solve previous year question papers to assess your understanding and identify areas that need improvement.
| 5. Are there any recommended resources or books for studying atomic structure for IIT JAM? | |
Ans. Yes, there are several recommended resources and books for studying atomic structure for IIT JAM. Some popular ones include:
1. "Physical Chemistry" by P.W. Atkins
2. "Quantum Chemistry and Spectroscopy" by Thomas Engel and Philip Reid
3. "Inorganic Chemistry" by J.D. Lee
4. "Chemical Principles: The Quest for Insight" by Peter Atkins and Loretta Jones
5. "Principles of Physical Chemistry" by B.R. Puri, L.R. Sharma, and M.S. Pathania
These books provide comprehensive coverage of atomic structure and related topics, along with practice problems and examples that can help in effective preparation for the IIT JAM exam.
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