Introduction to Atomic Structure

Q. Which of the following statements is true for Coulomb's law constant $\left(k\right)$?

1. For air, $k=9\times {10}^9{\text{N m}}^2{\text{C}}^{-2}$
2. It is can't be determined when the medium is nitrogen gas
3. $k$ does not depend on the medium
4. It is also called vacuum permittivity

Q. In an atom, electrons and the nucleus are held together by:

1. Electrostatic force of attraction
2. Electrostatic force of repulsion
3. Electrodynamic force of attraction
4. Electrodynamic force of repulsion

Q. The increasing order (lowest first) for the values of $e/m$ (charge/mass) for electron ($e$), proton ($p$), neutron ($n$) and alpha particle ($\alpha$) is:

1. $e$, $p$, $n$, $\alpha$
2. $n$, $p$, , $e$, $\alpha$
3. $n$, $p$, $\alpha$, $e$
4. $n$, $\alpha$, $p$, $e$

Q. The magnitude of charge is the same for which of the following subatomic particles?

1. Electron and proton
2. Electron and neutron
3. Proton and neutron
4. All of the above

Q. If the absolute mass of an electron is $x$ kg, then the absolute mass of a proton will be?

1. $\frac{x}{1837}$ kg
2. $\frac{1837}{x}$ kg
3. $1837x$ kg
4. Cannot be determined

Q. The magnitude of charge is the same for which of the following subatomic particles?

1. Electron and proton
2. Electron and neutron
3. Proton and neutron
4. All of the above

Q. A subatomic particle has a -1 relative unit charge and the ratio of charge to mass is $1.758820\times {10}^{11}Ck{g}^{–1}$. Find the absolute mass of the sub-atomic particle in kg.

1. $6.4\times {10}^{-31}kg$
2. $9.1\times {10}^{-31}kg$
3. $9.1\times {10}^{-30}kg$
4. $3.8\times {10}^{-31}kg$

Q. The charge to mass ratio of an alpha particle is:

1. 2 times the $\frac{e}{m}$ value of an electron
2. 4 times the $\frac{e}{m}$ value of an electron
3. 2 times the $\frac{e}{m}$ value of a proton
4. $\frac{1}{2}$times the $\frac{e}{m}$ value of a proton

Q. Which of the following statements is true for Coulomb's law constant $\left(k\right)$?

1. For air, $k=9\times {10}^9{\text{N m}}^2{\text{C}}^{-2}$
2. It is can't be determined when the medium is nitrogen gas
3. $k$ does not depend on the medium
4. It is also called vacuum permittivity

Q. The increasing order (lowest first) for the values of $e/m$ (charge/mass) for electron ($e$), proton ($p$), neutron ($n$) and alpha particle ($\alpha$) is:

1. $e$, $p$, $n$, $\alpha$
2. $n$, $p$, , $e$, $\alpha$
3. $n$, $p$, $\alpha$, $e$
4. $n$, $\alpha$, $p$, $e$

Q. Assertion: Chemical reactions involve the rearrangement of atoms.
Reason: Atoms are indestructible and can neither be created nor be destroyed in a chemical reaction.

1. Both the Assertion and the Reason are correct and the reason is the correct explanation of the Assertion
2. The Assertion and the Reason are correct but the reason is not the correct explanation of the Assertion
3. The Assertion is true but the reason is false
4. Both the statements are false