Electron | MCQs

Explanation

UJT (Uni-Junction Transistor) is a low resistance diode when conducting.

It is used in triggering and timing circuits, featuring a low resistance between the emitter and base in its conducting state.

Explanation

An RC low-pass circuit is called a low-pass filter.

It allows signals with frequencies lower than a certain cutoff frequency to pass through while attenuating higher frequencies.

Explanation

A DIAC is an AC switch.

It conducts in both directions once a certain breakdown voltage is reached.

This making it useful for switching applications in AC circuits.

Explanation

The Diac is a bidirectional device without a gate.

It conducts in both directions once its breakdown voltage is exceeded.

This making it useful for switching applications.

Explanation

The central layer is made very thin and lightly doped as compared with the two outer layers and is called the base.

The outer sections are called emitter and collector.

Explanation

Explanation

Explanation

The electronic configuration of chromium (Proton number 24) is [Ar] 3d⁵ 4s¹.

Chromium exhibits an exception to the standard filling order to achieve a more stable half-filled d-subshell.

Explanation

Sulfur (S) has the smallest atomic radius among the options.

Because atomic radius decreases across a period from left to right due to increasing nuclear charge, which pulls the electrons closer to the nucleus.

Francium (Fr) has the highest atomic radius in the periodic table.

Helium has the smallest atomic radius in the periodic table.

Explanation

Only lone pairs participate in determining geometry of molecules this statement is NOT a feature of Valence Shell Electron Pair Repulsion (VSEPR) theory.

As both lone pairs and bonding pairs of electrons participate in determining the geometry of molecules.

VSEPR theory states that electron pairs (both bonding and lone pairs) repel each other, influencing the shape of the molecule.