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Q. No.
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 |
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| Assertion (A): | The energy of an electron is largely determined by its principal quantum number. |
| Reason (R): | The principal quantum number is a measure of the most possible distance of finding the electron around the nucleus. |
| 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: Quantum Numbers & Schrodinger Wave Equation |
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Consider the given two statements:
Select the correct option:
| Assertion (A): | The absorption spectrum consists of some bright lines separated by dark spaces. |
| Reason (R): | The emission spectrum consists of dark lines. |
| 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: Type of Spectra |
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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 |
From NCERT
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A golf ball has a mass of 46 g and a speed of 45 m/s. If the speed can be measured within the accuracy of 3%, the uncertainty in the position is:
1. 8.4×10-34m
2. 6.4×10-33m
3. 6.6×10-39m
4. 2.1×10-34m
1. 8.4×10-34m
2. 6.4×10-33m
3. 6.6×10-39m
4. 2.1×10-34m
Subtopic: Heisenberg Uncertainty Principle |
55%
From NCERT
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| Assertion (A): | Angular momentum of the electron in the orbit that has four subshells is \(2h\over\pi\). |
| Reason (R): | Angular momentum of the electron is quantized. |
| 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: Bohr's Theory |
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Given below are two statements:
In light of the above statements, choose the correct answer from the options given below:
| Statement I: | The value of wave function, \(\Psi\) depends upon the coordinates of the electron in the atom. |
| Statement II: | The probability of finding an electron at a point within an atom is proportional to the orbital wave function. |
| 1. | Statement I is True but Statement II is False. |
| 2. | Statement I is False but Statement II is True. |
| 3. | Both Statement I and Statement II are True. |
| 4. | Both Statement I and Statement II are False. |
Subtopic: Quantum Numbers & Schrodinger Wave Equation |
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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Hund’s rule states that:
| 1. | No two electrons can be in two separate orbitals. |
| 2. | No two electrons can be present with similar spin in an orbital. |
| 3. | Two electrons can exist in d orbital. |
| 4. | None of the above. |
Subtopic: Pauli's Exclusion Principle & Hund's Rule |
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In which of the following transitions of hydrogen atom, radiation of minimum frequency is emitted ?
1. n2 = \(\infty\) to n1 = 1
2. n2 = 2 to n1 = 1
3. n2 = 3 to n1 = 2
4. n2 = \(\infty\) to n1 = 3
Subtopic: Hydrogen Spectra |
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