Physics

Speed is a scalar quantity because it only has magnitude and no direction, whereas acceleration, displacement, and force are vector quantities with both magnitude and direction.

In an isochoric process, the volume remains constant, so there is no displacement of the boundary. Since work done is given by W = PΔV, and ΔV = 0, the work done is zero.

A force is conservative if the work it does depends only on the initial and final positions of the particle, not on the path taken between them. This means the work done by the force is path-independent, which is the defining property of conservative forces.

Light travels fastest in a vacuum and slows down when passing through denser media. Among the given options, glass has a higher refractive index than air and water, so light speed is minimum in glass.

Newton's Third Law states that for every action, there is an equal and opposite reaction, which is exactly described in option A. The other options describe different physical laws unrelated to Newton's Third Law.

TV audio signals are typically transmitted using frequency modulation (FM) because FM provides better noise immunity and sound quality compared to amplitude modulation (AM).

Raindrops fall through the air and eventually reach a terminal velocity, which depends on their size and shape. Different droplets have different terminal velocities, so they fall at different ultimate speeds.

Cadmium is a stable, non-radioactive element, whereas thorium, radium, and uranium are all naturally radioactive elements. Therefore, cadmium is the correct answer as it is not radioactive.

The force of attraction between any two bodies due to their masses is called gravitational force. It is a fundamental force that acts between all masses in the universe.

The core of a transformer is laminated to reduce eddy current losses. Laminations increase the resistance to eddy currents, thereby minimizing energy loss due to circulating currents induced in the core.