Third term CBT

If you wanted to see the beautiful rings of a planet, which planet would you choose?

• Saturn

• Jupiter

• Uranus

• Neptune

Answer explanation

Saturn's rings are the most prominent and well-known in our solar system

Which planet is farthest from the Sun and would be the coldest planet to visit?

• Neptune

• Uranus

• Saturn

• Jupiter

Answer explanation

Neptune is the farthest planet from the Sun and has very low temperatures

Which of the following is not a source of sound?

• A vibrating guitar string

• A ringing bell

• A burning candle

• A beating drum

Answer explanation

Sound is produced by vibrating objects. A ringing bell, a vibrating guitar string, and a beating drum all produce sound by vibration. A burning candle, however, does not produce sound by vibration; it produces light and heat.

What unit is used to measure the frequency of sound?

• Second (s)

• Decibel (dB)

• Meter (m)

• Hertz (Hz)

Answer explanation

The frequency of sound is measured in Hertz (Hz), which indicates the number of vibrations (or cycles) per second.

What is the mantle primarily composed of?

• Iron and Nickel

• Silicate rocks

• Water and Ice

• Carbon and Hydrogen

Answer explanation

The mantle is primarily composed of silicate rocks rich in iron and magnesium. These rocks are solid but can flow slowly over geological time scales.

What causes earthquakes?

• Movements within the Earth's outer core

• Movements of tectonic plates

• Changes in atmospheric pressure

• Erosion of the Earth's surface

Answer explanation

Earthquakes are caused by the sudden release of energy due to movements or collisions of tectonic plates.

What is the chemical formula for methane?

• CO2

• CH4

• NH3

• H2O

Answer explanation

The chemical formula for methane is CH4, indicating it has one carbon atom and four hydrogen atoms.

Which of the following best describes the difference between a molecule and a compound?

• All molecules are compounds, but not all compounds are molecules

• All compounds are molecules, but not all molecules are compounds

• Molecules are made of one type of atom, while compounds are made of different types of atoms

• Molecules are larger than compounds

Answer explanation

A compound is a type of molecule that contains at least two different types of atoms chemically bonded together. All compounds are molecules, but not all molecules are compounds because some molecules (like O2) consist of only one type of atom.

What is the smallest unit of matter that retains the properties of an element?

• Molecule

• Atom

• Proton

• Electron

Answer explanation

An atom is the smallest unit of matter that retains the properties of an element. It consists of protons, neutrons, and electrons.

Which of the following is an example of a chemical change?

• Melting ice

• Boiling water

• Rusting iron

• Breaking a glass

Answer explanation

A chemical change involves the formation of new substances with different properties. Rusting iron is a chemical change because it forms a new substance (iron oxide) with different properties from the original iron.