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Q. No.Subtopic: Introduction of Atomic Structure |
From NCERT
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Which of the following statements is/are not correct?
Choose the correct option:
| (a) | Isotones differ in the number of neutrons. |
| (b) | Isobars contain the same number of neutrons but differ in the number of protons. |
| (c) | No isotope of hydrogen is radioactive. |
| (d) | The density of the nucleus is much greater than that of an atom. |
| 1. | (a), (b) and (c) | 2. | (b), (c) and (d) |
| 3. | (b) and (c) | 4. | All of the above. |
Subtopic: Number of Electron, Proton & Neutron |
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| Assertion (A): | The mass numbers of most of the elements are fractional. |
| Reason (R): | Mass numbers are obtained by comparing with the mass number of carbon taken as \(12.\) |
In light of the above statements choose the answer from the options given below:
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False |
| 4. | Both (A) and (R) are False. |
Subtopic: Number of Electron, Proton & Neutron |
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The number of electrons in an atom with atomic number 105 having (n+1) = 8 are:
1. 30
2. 17
3. 15
4. Unpredictable
Subtopic: Number of Electron, Proton & Neutron |
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Photons of wavelength 4000 are used to break molecules. The percentage of energy converted to the kinetic energy of atoms will be :
(bond dissociation energy of the molecule is 246.5 kJ/mol)
1. 12%
2. 8%
3. 26%
4. 17%
Subtopic: Electromagnetic Radiation |
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Match List I with List II
Choose the correct answer from the options given below:
| List I (Frequency region) | List II (Uses) |
| A. Radiofrequency | I. Radar |
| B. Microwave | II. Broadcast |
| C. Infra-red region | III. Heating |
| A | B | C | |
| 1. | II | I | III |
| 2. | I | II | III |
| 3. | I | III | II |
| 4. | II | III | I |
Subtopic: Electromagnetic Radiation |
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| Assertion (A): | The kinetic energy of photo-electrons increases with an increase in the frequency of incident light where v>v0. |
| Reason (R): | Whenever the intensity of light is increased the number of photo-electron ejected always increases. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Planck's Theory |
From NCERT
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What is the wavelength of light corresponding to photons with an energy of 1.00 × 103 kJ mol–1?
1. 2.00 × 1031 m
2. 1.20 × 10–7 m
3. 1.20 × 10–4 m
4. 8.36 × 106 m
1. 2.00 × 1031 m
2. 1.20 × 10–7 m
3. 1.20 × 10–4 m
4. 8.36 × 106 m
Subtopic: Photo Electric Effect |
From NCERT
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Given below are two statements:
| Statement I: | The frequency at which wavelength of 400 nm is 9.50×1014Hz. |
| Statement II: | The frequency at which wavelength of 750 nm is 4.00×1014 Hz. |
| 1. | Statement I is incorrect and Statement II is correct. |
| 2. | Both Statement I and Statement II are correct. |
| 3. | Both Statement I and Statement II are incorrect. |
| 4. | Statement I is correct and Statement II is incorrect. |
Subtopic: Photo Electric Effect |
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An absorption line of the lowest frequency in the transition of hydrogen spectra is:
1. n=1 to n=2
2. n=3 to n=8
3. n=2 to n=1
4. n=8 to n=3
Subtopic: Hydrogen Spectra |
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