- 1(current)
Q. No.Which of the following statement is not correct about the characteristics of cathode rays?
| 1. | They start from the cathode and move towards the anode |
| 2. | They travel in straight line in the absence of an external electrical or magnetic field |
| 3. | Characteristics of cathode rays do not depend upon the material of electrodes in cathode ray tube |
| 4. | Characteristics of cathode rays depend upon the nature of gas present in the cathode ray tube |
| 1. | 2.4 ×10–19 g | 2. | 2.4 ×10–27 g |
| 3. | 2.4 ×10–24 g | 4. | None of these |
Correct statement about the properties of the atom explained by the Thomson
model of an atom is:
| 1. | Overall neutrality of atom |
| 2. | Spectra of a hydrogen atom |
| 3. | Position of electrons, protons, and neutrons in an atom |
| 4. | Stability of atom |
Which of the following conclusions could not be derived from Rutherford's -particle scattering experiment?
| 1. | Most of the space in the atom is empty. |
| 2. | The radius of the atom is about 10-10 m while that of a nucleus is 10–15 m. |
| 3. | Electrons move in circular path of fixed energy called orbits. |
| 4. | Electrons and the nucleus are held together by electrostatic forces of attraction. |
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
Calculate the wave number of light having a time period of 2.0 × 10⁻¹⁰ s.
1. 16.66 m–1
2. 1.66 m–1
3. 32.34 m–1
4. 12.34 m–1
Find the radius of each carbon atom if 2 × 10⁸ identical carbon atoms arranged side by side form a straight line of length 2.4 cm.
1. 7.0 × 10–11 m
2. 5.0 × 10–11 m
3. 8.0 × 10–11 m
4. 6.0 × 10–11 m
What is the number of zinc atoms present in a linear arrangement of length 1.6 cm, given that the diameter of a zinc atom is 2.6 Å?
| 1. | 5.153 × 107 | 2. | 6.153 × 107 |
| 3. | 4.153 × 109 | 4. | 6.153 × 103 |
In Rutherford's \(\alpha\)-particle scattering experiment, a thin foil of heavy metals like gold or platinum is typically used. If a lighter metal foil, such as aluminum, were used instead, how would the observed deflection patterns change?
1. The same results will be observed
2. More deflection would be observed
3. There will not be enough deflection
4. None of the above
Why are the symbols ⁷⁹₃₅Br, and ⁷⁹Br are considered acceptable, whereas ³⁵₇9Br and ³⁵Br are not acceptable representations of bromine?
| 1. | The general convention for representing an element along with its atomic number (A) and atomic mass (Z) is |
| 2. | The general convention for representing an element along with its atomic mass (A) and atomic number (Z) is |
| 3. | The general convention for representing an element along with its wavelength (A) and frequency (Z) is |
| 4. | The general convention for representing an element along with its isotopes (A) and atomic number (Z) is |
- 1(current)
Q. No.
© 2026 GoodEd Technologies Pvt. Ltd.