Q. No.The incorrect statement regarding the characteristics of X-rays is :
1. The radiation can ionize the gas
2. It causes a fluorescence effect on ZnS
3. It is deflected by electric and magnetic fields
4. Have a shorter wavelength than ultraviolet rays
| Assertion (A): | All isotopes of a given element show the same type of chemical behaviour. |
| Reason (R): | The chemical properties of an atom are controlled by the number of electrons in the atom. |
| 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. |
The number of protons, neutrons and electrons in \( _{71}^{175}Lu\) respectively, are:
1. 104, 71 and 71
2. 71, 71 and 104
3. 175, 104 and 71
4. 71, 104 and 71
Match the following:
| Column I | Column II | ||
| A. | X-rays | 1. | |
| B. | Ultraviolet wave (UV) | 2. | |
| C. | Long radio waves | 3. | |
| D. | Microwave | 4. |
| A | B | C | D | |
| 1. | 4 | 1 | 3 | 2 |
| 2. | 1 | 4 | 2 | 3 |
| 3. | 1 | 4 | 3 | 2 |
| 4. | 4 | 3 | 1 | 2 |
A particular station of All India Radio, New Delhi, broadcasts on a frequency of 1,368 kHz (kilohertz). The wavelength of the electromagnetic radiation emitted by the transmitter is: [speed of light, ]
| 1. | 2192 m | 2. | 21.92 cm |
| 3. | 219.3 m | 4. | 219.2 m |
| Assertion (A): | A black body is an ideal body that emits and absorbs radiation of all frequencies. |
| Reason (R): | The frequency of radiation emitted by a body goes from lower frequency to a higher frequency with an increase in temperature. |
| 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. |
The energies E1 and E2 of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths ( λ1 and λ2 ) will be:
1. λ1 = 2λ2
2. λ1 = 4λ2
3. λ1 = λ2
4. λ1 = λ2
In photoelectric effect, the kinetic energy of photoelectrons increases linearly with the:
1. Wavelength of incident light.
2. Frequency of incident light.
3. Velocity of incident light.
4. Atomic mass of an element.
The photoelectric emission from a surface starts only when the light incident upon the surface has a certain minimum:
| 1. | Intensity | 2. | Wavelength |
| 3. | Frequency | 4. | Velocity |
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