Q. No.Which of the following statements about the properties of X-rays is incorrect?
1. X-rays can ionize gases.
2. X-rays produce fluorescence in zinc sulphide (ZnS).
3. X-rays are deflected by electric and magnetic fields.
4. X-rays have shorter wavelengths 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. |
An isotope of an element contains 19.23% more neutrons than protons. Identify the element and determine its mass number.
(Given: Atomic numbers of Fe = 26 and Co = 27)
| 1. | \(\mathrm {^{56}Fe }\) | 2. | \({ }^{57} \mathrm{Fe}\) |
| 3. | \({ }^{57} \mathrm{Co}\) | 4. | \({ }^{60} \mathrm{Co}\) |
Determine the number of protons, neutrons and electrons, respectively, present in a neutral atom of lutetium (¹⁷⁵₇₁Lu).
1. 104, 71 and 71
2. 71, 71 and 104
3. 175, 104 and 71
4. 71, 104 and 71
Match types of wave in Column-I with the corresponding frequency in Column-II and mark the appropriate option:
|
Column-I
(Types of Wave)
|
Column-II (Corresponding Frequency) |
||
| A. | X-rays | I. | |
| B. | Ultraviolet wave (UV) | II. | |
| C. | Long radio waves | III. | |
| D. | Microwave | IV. |
| A | B | C | D | |
| 1. | IV | I | III | II |
| 2. | I | IV | II | III |
| 3. | I | IV | III | II |
| 4. | IV | III | I | II |
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): | An ideal black body emits and absorbs radiation of every possible frequency. |
| Reason (R): | An increase in the temperature of a body causes its radiation spectrum to peak at progressively higher frequencies. |
| 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. |
Two electromagnetic radiations have photon energies of 25 eV and 50 eV, respectively. Determine the relationship between their corresponding wavelengths, λ₁ and λ₂.
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
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