Electron | MCQs

Explanation

If the RC value is small in a circuit, the capacitor charges fastly. 

RC time constant: The time constant in an RC circuit is represented by the product of resistance (R) and capacitance (C). 

Charging speed: A smaller RC value means the capacitor charges faster. 

Large RC value: Conversely, a large RC value indicates a slower charging process for the capacitor. 

Explanation

The radius of an atomic orbital increases with the square of the principal quantum number (n).
So, larger values of n result in electrons being farther from the nucleus:

Radius∝n2

Explanation

Ionization energy (potential) is measured in:

• Electron volts (eV) (for single atoms).
• Kilojoules per mole (kJ/mol) (for molar quantities).

Explanation

Explanation

Excitation energy is the energy needed for an electron to jump from its ground state to a higher energy level.

It is less than ionization energy, as the electron remains bound to the atom after excitation.

Explanation

A semiconductor has electrical properties between a conductor and an insulator.

It conducts electricity under certain conditions, making it essential in electronic devices.

Explanation

Silicon is the most widely used material in semiconductor devices due to its:

• Abundance in nature

• Suitable electrical properties

• Excellent thermal stability

• Formation of a stable oxide layer (SiO₂), which is useful in device fabrication

While germanium was used in early semiconductors and gallium nitride is used in high-power or high-frequency applications, silicon remains the industry standard.

Explanation

1 electron has a charge of 1.6 × 10⁻¹⁹ C  

So, 1 C = 1 / (1.6 × 10⁻¹⁹) = 6.25 × 10¹⁸ electron

Explanation

 When capacitors are connected in parallel, their capacitances add up directly:

C_eq = C₁ + C₂ + C₃ = 2 + 2 + 2 = 6 µF

Explanation