Electron | MCQs

Explanation

An electron volt (eV) is a unit of energy.

It is defined as the amount of kinetic energy gained or lost by a single electron when it is accelerated through an electric potential difference of one volt.

Specifically:

1eV=1.602×10 −19 Joules

Thus, the electron volt is a convenient unit for measuring small amounts of energy, particularly in the fields of atomic and particle physics.

Explanation

UJT (Uni-Junction Transistor) is also known as Double Base.

It has two bases and one emitter, distinguishing it from other transistors.

Explanation

To solve this problem, we need to find the total current (I) drawn from the 220 V source.

First, let's find the current through one resistor:

I1 = V/R = 220 V / 68 ohms = 3.24 A (using Ohm's Law)

Since all resistors are identical and connected in parallel, the current through each resistor is the same:

I1 = I2 = I3 = I4 = 3.24 A

Now, we can find the total current (I) by adding the currents through each resistor:

I = I1 + I2 + I3 + I4 = 3.24 A + 3.24 A + 3.24 A + 3.24 A = 12.96 A ≈ 12.94 A

So, the correct answer is: 12.94 A

Explanation

A galvanometer is used as a null detector in a Wheatstone bridge.

It detects the zero current condition, indicating that the bridge is balanced.

Explanation

The Hay Bridge is used for the measurement of inductance.

It is specifically designed to measure the inductance of coils with high accuracy.

Explanation

UJT (Uni-Junction Transistor) has negative resistance.

This characteristic allows it to be used in oscillators and timing circuits.

Explanation

The resistance in an NTC (Negative Temperature Coefficient) Thermistor decreases with a rise in temperature.

This characteristic makes NTC thermistors useful for temperature sensing and control applications.

Explanation

SCR (Silicon Controlled Rectifier) is a four-layer device.

It consists of four layers of semiconductor material arranged as alternately P-type and N-type layers.

Explanation

A Circuitry is a path in an electronic circuit.  

In electronics, a circuit is a complete circular path that electricity flows through.

A simple circuit consists of a current source, conductors and a load.

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Explanation

A capacitor consists of two conductors separated by a non-conductive region.

It stores electrical energy in an electric field between the conductors.