Q2 Benchmark Review

Front

What is an electromagnet?

Back

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. It consists of a coil of wire, often wrapped around a core of ferromagnetic material.

Front

How does the number of coils affect the strength of an electromagnet?

Back

The strength of an electromagnet increases as the number of coils around the core increases, due to the greater magnetic field generated by the additional loops of wire.

Front

What is redshift in astronomy?

Back

Redshift is the phenomenon where light from an object is shifted towards the red end of the spectrum, indicating that the object is moving away from the observer, often used to demonstrate the expansion of the universe.

Front

What is digitalization in the context of information transmission?

Back

Digitalization refers to the process of converting information into a digital format, allowing it to be easily stored, transmitted, and processed by computers.

Front

What is an electric field?

Back

An electric field is a region around a charged particle where other charged particles experience a force. It can be generated by static electricity, such as rubbing balloons with a wool rag.

Front

What is the principle of conservation of energy?

Back

The principle of conservation of energy states that energy cannot be created or destroyed, only transformed from one form to another.

Front

What is the significance of spectral lines in astronomy?

Back

Spectral lines are unique patterns of light emitted or absorbed by elements, allowing astronomers to determine the composition, temperature, density, and motion of celestial objects.

Front

What is the difference between contact and non-contact forces?

Back

Contact forces require physical interaction between objects (e.g., friction), while non-contact forces act at a distance (e.g., gravitational, electric, and magnetic forces).

Front

What is the role of a medium in signal transmission?

Back

A medium is a substance through which signals (like sound or light) travel. Digital signals can be transmitted over various media, including cables and air.

Front

What is gravitational force?

Back

Gravitational force is the attractive force between two masses, which pulls them towards each other. It is one of the four fundamental forces of nature.