Explanation

A colour printer uses 4 colours:

1. Cyan,
2. Magenta,
3. Yellow,
4. Black (CMYK).

These four inks mix to produce a full spectrum of printed colours.

Explanation

Capacitance depends on area of plates, distance between them, and the dielectric (medium) used.

It does not directly depend on the electric field, which is a result of the charge and voltage, not a factor in determining capacitance.

Explanation

The efficiency of a Carnot engine is given by 

Efficiency = 1 − 𝑄 rejected /𝑄 accepted

where  𝑄 accepted and  𝑄 rejected is the heat absorbed and rejected, respectively.

Explanation

The "opposing" Electromotive Force is often described as a Back Electromotive Force (Back EMF).

This is the voltage generated in opposition to the applied voltage in a circuit.

This particularly in inductive components like motors or coils, due to changes in current.

Explanation

• The flow of electrons is called Electric Current.
• Electric current is the flow of electrons through a conductor, such as a wire.
• It is measured in amperes (A).

Explanation

• Galileo Galilei is credited with creating his own improved version of the telescope in 1609, based on the design of the "Dutch perspective glasses".
• Although he did not invent the telescope, his improvements to the design and his astronomical discoveries using the telescope made him a key figure in its history.

Explanation

The Earth and the Sun are approximately 25,000 light-years away from the center of the Milky Way galaxy.

Explanation

• Nuclear fusion is the process by which atomic nuclei combine to form a heavier nucleus, releasing vast amounts of energy in the process.
• In the case of stars, nuclear fusion occurs when hydrogen atoms fuse together to form helium, releasing energy in the form of light and heat.

Explanation

• A movable pulley is a type of pulley system where the pulley is free to move along the rope or cable.
• This allows the force applied to the rope to be multiplied, making it easier to lift or move heavy loads.
• Movable pulleys are commonly used in cranes, winches, and other lifting machines.

Explanation

• Electromagnets can be easily turned on and off by controlling the electric current flowing through them.
• It making them useful in applications like cranes (where they can be used to lift and release heavy loads) and doorbells (where they can be used to strike a bell or activate a buzzer).
• This switchability is a key characteristic that makes electromagnets useful in many applications.