📘 Study MCQs
Q1. The primary function of red blood cells is to:
Transport oxygenRed blood cells contain hemoglobin, a protein that binds to oxygen in the lungs and releases it to tissues throughout the body.
Q2. Which of the following is a renewable resource?
Solar energyA renewable resource is one that can be used repeatedly and is naturally replenished on a human timescale, like energy from the sun.
Q3. Coca alkaloids increase alertness by stimulating the:
Brain and nervous systemCoca alkaloids, such as cocaine, are central nervous system stimulants. They work by increasing the levels of neurotransmitters like dopamine in the brain, leading to heightened alertness and euphoria.
Q4. Which planet in our solar system is known as the “Red Planet”?
MarsMars appears red because its surface is covered in iron oxide, or rust, which gives the landscape a reddish hue.
Q5. What is the chemical symbol for water?
H2OThe chemical formula H2O represents one oxygen atom covalently bonded to two hydrogen atoms.
Q6. In a simple series electrical circuit, if one light bulb burns out, what happens to the others?
They turn offIn a series circuit, the current flows through a single path. If that path is broken by a burnt-out bulb, the current cannot flow to the other bulbs.
Q7. Which force is responsible for holding the planets in orbit around the Sun?
GravityGravity is the attractive force between all objects with mass. The Sun’s immense gravitational pull keeps the planets in their elliptical orbits.
Q8. The process by which plants convert light energy into chemical energy is called:
PhotosynthesisDuring photosynthesis, plants use sunlight, water, and carbon dioxide to create glucose (their food) and release oxygen as a byproduct.
Q9. Which of these is not a state of matter?
HeatThe three most common states of matter on Earth are solid, liquid, and gas. Heat is a form of energy, not a state of matter.