2023 District Science

Front

What is the efficiency of a heat engine?

Back

Efficiency is the ratio of useful work output to the total energy input, often expressed as a percentage.

Front

How do you calculate the work done by a heat engine?

Back

Work done = Efficiency × Heat energy pulled from the hot reservoir.

Front

What is a ketone?

Back

A ketone is an organic compound characterized by a carbonyl group (C=O) bonded to two other carbon atoms.

Front

What type of reaction is photosynthesis?

Back

Photosynthesis is an endothermic reaction, meaning it absorbs energy.

Front

What occurs during Metaphase in Mitosis?

Back

During Metaphase, chromosomes line up at the cell's equatorial plane.

Front

What is the role of gluons in physics?

Back

Gluons are bosons that mediate the strong force, which holds quarks together in protons and neutrons.

Front

What is the role of the Z boson?

Back

The Z boson mediates the weak force, which is responsible for processes like beta decay.

Front

What is the role of photons in physics?

Back

Photons are bosons that mediate electromagnetic force, responsible for electromagnetic interactions.

Front

Define endothermic reaction.

Back

An endothermic reaction is a chemical reaction that absorbs energy from its surroundings.

Front

Define exothermic reaction.

Back

An exothermic reaction is a chemical reaction that releases energy to its surroundings.