C++ | MCQs

Explanation

Resistors connected in parallel are arranged side-by-side, allowing the charge to split into multiple paths.

Each resistor experiences the same voltage across it but has different currents depending on its resistance.

Explanation

In a parallel circuit, the charge which passes through one resistor will always pass through the other resistors.

Each resistor provides a separate path for the current, so the current divides among them according to their resistances.

Explanation

Superconductivity is a phenomenon of exactly zero electrical resistance and expulsion of magnetic fields occurring in certain materials when cooled below a characteristic critical temperature.

This allows for highly efficient electrical conduction and magnetic field exclusion.

Explanation

The materials are called conductors if the electrons can move easily.

Conductors, like copper and aluminum.

It have low resistance and allow electrical current to flow freely through them.

Explanation

The quantity known as the equivalent resistance indicates the total resistance of the circuit.

It combines the effects of all resistors in the circuit into a single, overall resistance value.

Explanation

An image formed by a convex lens is called real and inverted.

This occurs when the image is formed on the opposite side of the lens from the object.

This is upside down relative to the object.

Explanation

This formula is the Lorentz force law

And describes the force experienced by a current-carrying conductor in a magnetic field.

F=BILsin(θ)

F is the force acting on the conductor (in Newtons, N).

B is the magnetic field strength (in Tesla, T).

I is the current flowing through the conductor (in Amperes, A).

L is the length of the conductor that is perpendicular to the magnetic field (in meters, m).

θ is the angle between the current's direction and the magnetic field's direction.

Explanation

The (reverse) saturation current of a p-n junction diode is the current caused by the diffusion of minority carriers

From the n-type/p-type regions (quasi-neutral regions) to the depletion region

Explanation

Torricelli's theorem is specifically used to find the velocity of efflux.

It states that the velocity of fluid flowing out of an opening (such as a small hole in a container) can be found using the equation:

v=  under root 2gh

where:

 𝑣 is the velocity of efflux,

𝑔  is the acceleration due to gravity (approximately 9.81 m/s²),

ℎ  is the height of the fluid above the opening.

This theorem is particularly useful in situations involving the flow of liquids through openings or nozzles.

Explanation

The capacitance  𝐶 is defined as the charge  𝑄 stored per unit voltage  𝑉 

Mathematically, it's represented as:

𝐶 =𝑄/𝑉

So, 1 farad (F) is equal to 1 coulomb (C) per volt (V), but the equation doesn't imply that 

1C=1V.

Instead, it means that a capacitor has a capacitance of 1 farad if it can store 1 coulomb of charge when a voltage of 1 volt is applied across it.