Practice MCQ Questions and answers on Physics-GK

The net electric charge of a conductor resides entirely on its surface.

The strength of an electromagnet can be increased by increasing the length of the coiled wire, increasing current supply or increasing the number of turns.

The dimension of Planck's constant is the product of energy multiplied by time, a quantity called action. Planck's constant is often defined, therefore, as the elementary quantum of action. Its value in metre-kilogram-second units is defined as exactly 6.62607015 × 10^-34 joule second.

This is caused due to the interference caused by the electromagnetic waves generated by a passing vehicle. These waves were within the same frequency range as that of the waves of TV reception and hence caused Interference. interference is a phenomenon in which two waves superimpose to form a resultant wave of greater or lower amplitude. Interference usually refers to the interaction of waves that are correlated or coherent with each other, either because they come from the same source or because they have the same or nearly the same frequency. Interference effects can be observed with all types of waves, for example, light, radio, acoustic, and surface water waves and due to the interference caused by the vehicle electromagnetic disturbances occurs in the TV reception and gets distorted.

In SI units, permeability is measured in Henry per meter (H/m).

An Electric generator works on the principle of Faraday's law of Electromagnetic Induction.

Planck's constant, often denoted as "h," has the dimensions of angular momentum. It is a fundamental physical constant used in quantum mechanics to relate the energy of a photon to its frequency. Planck's constant is represented by the equation:

E=h⋅f

Where:
E represents energy,
h is Planck's constant,
f is the frequency of the photon.

The dimensions of Planck's constant (h) are the product of energy and time (ET), and it is often expressed in units like joule-seconds (J·s). Angular momentum also has the dimensions of energy multiplied by time (ET).

Henry is the unit of Magnetic Induction.

The Lyman series lies in the ultraviolet region of electromagnetic spectrum.

Ozone is present in the atmosphere in small amounts, in a layer 10 to 60 kilometres above the earth (ozonosphere) and in close proximity to the ground. The ozone layer serves as protective shield against ultraviolet (UV) rays.