Explanation

The wire used for fuse making has high resistivity and low melting temperature.

These properties ensure that the fuse melts quickly and safely breaks the circuit when excessive current flows through it.

Explanation

Diffusion refers to the process by which molecules intermingle as a result of their kinetic energy of random motion.

It is the net movement of molecules or atoms from a region of high concentration to a region of low concentration.

This is also referred to as the movement of a substance down a concentration gradient.

Explanation

Both bullets will hit the ground simultaneously.

The horizontal speed and mass do not affect the time to fall; only gravity influences vertical motion.

Since they are fired from the same height, they will experience the same vertical acceleration and hit the ground at the same time.

Explanation

A sound wave is a form of mechanical energy.

Sound energy is the energy released by an objects vibrations.

Explanation

A magnetic bar has two poles: the North pole and the South pole.

These poles determine the direction of the magnetic field.

Explanation

Optics is the branch of physics that studies light and its interactions with matter.

It including phenomena such as reflection, refraction, and dispersion.

Explanation

Louder sound is characterized by high amplitude.

Amplitude refers to the strength of the sound wave.

A higher amplitude results in a louder sound.

Explanation

PV = nRT is the mathematical form of the ideal gas law.

It relates the pressure, volume, and temperature of an ideal gas with the amount of gas in moles and the universal gas constant.

Explanation

The symbol of the SI unit Kelvin is K.

It is the base unit of temperature in the International System of Units.

It is used to measure thermodynamic temperature.

Explanation

The axis of the earth is an imaginary line passing through the North and South poles of the earth.

It serves as the central reference line around which the earth rotates, defining its rotational axis.