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Q. No.Millikan’s Oil drop Method was used to determine:
1. Neutron
2. Alpha particle
3. Positron
4. Charge on the electrons
1. Neutron
2. Alpha particle
3. Positron
4. Charge on the electrons
Subtopic: Introduction of Atomic Structure |
84%
Level 1: 80%+
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Which of the following best explains the phenomenon of diffraction of electrons?
1. Pauli exclusion principle
2. Hund's rule
3. The wave properties of matter
4. Heisenberg uncertainty principle
1. Pauli exclusion principle
2. Hund's rule
3. The wave properties of matter
4. Heisenberg uncertainty principle
Subtopic: Introduction of Atomic Structure |
84%
Level 1: 80%+
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When the atoms of gold sheet are bombarded with a beam of -particles, only a few alpha-particles get deflected where as most of them go straight undeflected. This is because:
| 1. | The force of attraction on the -particles by the oppositely charged electron is not sufficient. |
| 2. | The nucleus occupies much smaller volume as compared to the volume of atom. |
| 3. | The force of repulsion on fast moving -particles is very small. |
| 4. | The neutrons in the nucleus do not have any effect on -particles. |
Subtopic: Introduction of Atomic Structure |
83%
Level 1: 80%+
Hints
Which of the following statements about an electron is/are correct?
| (a) | It has a negative charge and is lighter than a proton. |
| (b) | It has a negative charge and is heavier than a proton. |
| (c) | Its position is less fixed than that of a proton. |
| (d) | Its position is more fixed than that of a proton. |
| 1. | (a) only | 2. | (a) and (c) |
| 3. | (b) and (d) | 4. | (c) only |
Subtopic: Introduction of Atomic Structure |
83%
Level 1: 80%+
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Q. No.
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