Electron | MCQs

Explanation

• The loss of electrons and protons (H+ ions) is called oxidation.
• Oxidation is a chemical reaction that involves the loss of electrons or the addition of oxygen.
• Resulting in a change in the oxidation state of an atom, molecule, or ion.

Explanation

• The high resolution of the electron microscope is primarily due to the short wavelength of the electron beam.
• This shorter wavelength allows for higher resolution and the ability to visualize smaller structures.

Explanation

The charges of Proton, Electron, Neutron respectively are:

• Proton: Positive charge (+1)
• Electron: Negative charge (-1)
• Neutron: Neutral charge (0)

Explanation

• A Unijunction Transistor (UJT) has one junction.
• It is commonly used in triggering circuits for thyristors and other semiconductor devices.

Explanation

Polar Capacitor is not a type of capacitor

A polar capacitor is NOT a type of capacitor because it does not exist in the classification of capacitors.

a capacitor is a device that stores electrical energy.

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Explanation

Quantum numbers describe values of conserved quantities in the dynamics of a quantum system

Explanation

The transistor is a semiconductor device with at least three terminals.

These terminals are typically referred to as the :

• Emitter
• Base
• Collector

They allow the transistor to control the flow of electrical signals and power. 

Explanation

The heavily doped region of a transistor is called the emitter.

The emitter's heavy doping ensures it injects a large number of charge carriers (electrons in NPN transistors, holes in PNP transistors) into the base region, which is crucial for the transistor's operation. 

Explanation

- Capacitance with dielectric: C = εr · C₀, where C₀ is the capacitance without dielectric.

- If the dielectric is removed, capacitance becomes C₀ = C / εr. 

So, the new capacitance is C divided by εr.

Explanation

 - In a pure capacitive circuit, the current leads the voltage by 90°.

- In a pure inductive circuit, the current lags behind the voltage by 90°.

- In both cases, there is a 90° phase difference between current and voltage