BMST Science 4 — Questions and Answers
Question 1: Which type of bond involves the sharing of electron pairs between atoms?
- Ionic bond
- Covalent bond (Correct answer)
- Hydrogen bond
- Metallic bond
Correct answer: Covalent bond
A covalent bond forms when two atoms share one or more pairs of electrons.
Question 2: What happens to the pressure of a gas if its volume is reduced while temperature stays constant?
- Pressure decreases
- Pressure stays the same
- Pressure increases (Correct answer)
- Pressure becomes zero
Correct answer: Pressure increases
According to Boyle's Law, pressure and volume are inversely proportional at constant temperature.
Question 3: Which organelle is responsible for producing ATP through cellular respiration?
- Nucleus
- Ribosome
- Mitochondria (Correct answer)
- Golgi apparatus
Correct answer: Mitochondria
Mitochondria are known as the powerhouse of the cell because they generate most of the cell's ATP.
Question 4: What is the SI unit of electric current?
- Volt
- Ohm
- Watt
- Ampere (Correct answer)
Correct answer: Ampere
The ampere (A) is the SI base unit used to measure electric current.
Question 5: Which layer of Earth's atmosphere contains the ozone layer?
- Troposphere
- Stratosphere (Correct answer)
- Mesosphere
- Thermosphere
Correct answer: Stratosphere
The ozone layer is located in the stratosphere, roughly 15–35 km above Earth's surface.
Question 6: A substance with a pH of 2 is best described as:
- Strongly basic
- Neutral
- Weakly acidic
- Strongly acidic (Correct answer)
Correct answer: Strongly acidic
A pH of 2 is well below 7, placing it firmly in the strongly acidic range.
Question 7: Which process describes water changing directly from a solid to a gas without passing through the liquid phase?
- Evaporation
- Condensation
- Sublimation (Correct answer)
- Deposition
Correct answer: Sublimation
Sublimation is the phase transition from solid directly to gas, as seen with dry ice.
BMST Science 4
Which type of bond involves the sharing of electron pairs between atoms?