Q. No.Symbols and can be written,
whereas symbols and are not acceptable because:
| 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 |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
The atomic number of elements whose outermost electronic configuration are represented by 3s1 and 2p5 respectively, is:
| 1. | 9, 7 | 2. | 9, 11 |
| 3. | 11, 5 | 4. | 11, 9 |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
A certain particle carries 2.5 × 10–16 C of static electric charge. The number of electrons present in it would be:
| 1. | 1460 | 2. | 1350 |
| 3. | 1560 | 4. | 1660 |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
If the diameter of a carbon atom is 0.15 nm, the number of carbon atoms that can be placed side by side in a straight line across the length of the scale of length 20 cm long will be:
| 1. | 1.33 × 107 | 2. | 5.46 × 108 |
| 3. | 1.33 × 109 | 4. | 2.36 × 108 |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
The diameter of a zinc atom is 2.6 Å. If zinc atoms are arranged side by side lengthwise, number of atoms present in a length of 1.6 cm would be:
1. 5.153 × 107
2. 6.153 × 107
3. 4.153 × 109
4. 6.153 × 103
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
2 × 108 atoms of carbon are arranged side by side. The radius of a carbon atom if the length of this arrangement is 2.4 cm would be :
1. 7.0 × 10–11 m
2. 5.0 × 10–11 m
3. 8.0 × 10–11 m
4. 6.0 × 10–11 m
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
Yellow light emitted from a sodium lamp has a wavelength (λ) of 580 nm. The frequency (ν) and wave number of this yellow light would be, respectively:
1. 517 × 1014 s–1 , 172 × 106 m–1
2. 6.17 × 1014 s–1 , 1.72 × 106 m–1
3. 4.17 × 1014 s–1 , 2.72 × 106 m–1
4. 5.17 × 1014 s–1 , 1.72 × 106 m–1
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
The wave number of a light whose time period is 2.0 × 10–10 s would be:
1. 16.66 m–1
2. 1.66 m–1
3. 32.34 m–1
4. 12.34 m–1
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
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
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
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
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
© 2026 GoodEd Technologies Pvt. Ltd.