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Consider the following events in the history of modern physics:
1. Confirmation of the neutron by James Chadwick
2. Discovery of radioactivity by Henri Becquerel
3. Award of the Nobel Prize in Physics to Albert Einstein
4. J. J. Thomson's experiments revealing the electron
Select the correct chronological order.
Match List-I with List-II:
| List-I (Scientist) | List-II (Contribution) |
|---|---|
| A. J. J. Thomson | 1. Explained the spectrum of the hydrogen atom |
| B. Rutherford | 2. Confirmed the neutral particle in the nucleus |
| C. Niels Bohr | 3. Found the small, heavy, positive centre of the atom |
| D. James Chadwick | 4. Showed that atoms contain negatively charged particles |
Select the correct answer using the codes given below.
Consider the following statements about the photoelectric effect:
1. Einstein explained it in 1905 by proposing that light comes in small packets of energy.
2. Einstein received the 1921 Nobel Prize in Physics for the theory of relativity.
3. A photocell works on this effect and is also called an 'electric eye'.
Which of the statements given above is/are correct?
Match List-I with List-II:
| List-I (Term) | List-II (Description) |
|---|---|
| A. Alpha decay | 1. Emission of high-energy photons |
| B. Beta decay | 2. Time in which half the nuclei of a sample decay |
| C. Gamma decay | 3. Emission of a helium nucleus |
| D. Half-life | 4. Emission of an electron or a positron |
Select the correct answer using the codes given below.
Consider the following statements about nuclear reactions:
1. In fission, a heavy nucleus struck by a neutron splits into two parts and releases more neutrons.
2. In fusion, light nuclei join to form a heavier nucleus.
3. A nuclear reactor works on an uncontrolled chain reaction.
Which of the statements given above is/are correct?
Consider the following statements about semiconductors:
1. Adding a trivalent element such as boron to a semiconductor makes it n-type.
2. Silicon and germanium are elemental semiconductors.
Which of the statements given above is/are correct?
Match List-I with List-II:
| List-I (Device) | List-II (Conversion) |
|---|---|
| A. Rectifier | 1. Electrical energy to light |
| B. LED | 2. AC to DC |
| C. Solar cell | 3. Mechanical energy to electrical energy |
| D. Generator | 4. Light to electrical energy |
Select the correct answer using the codes given below.
Consider the following statements about radioactivity:
1. In radioactivity, an unstable nucleus breaks up on its own.
2. Henri Becquerel discovered radioactivity accidentally while working on compounds of uranium.
Which of the statements given above is/are correct?
Consider the following statements about the structure of the atom:
1. Rutherford found the nucleus from the scattering of alpha particles.
2. Niels Bohr explained the hydrogen spectrum using the idea of fixed orbits of electrons.
3. The nucleus of an atom contains protons and electrons.
Which of the statements given above is/are correct?
Consider the following statements about the photoelectric effect:
1. When suitable light falls on a metal surface, electrons are emitted from the metal.
2. The effect was explained on the idea that light comes in small packets of energy.
3. The photoelectric effect was explained by Niels Bohr.
Which of the statements given above is/are NOT correct?
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