What is the speed of electromagnetic waves in a vacuum?

• 299,792 km/s

• 300,000 km/s

• 150,000 km/s

• 250,000 km/s

State the first law of thermodynamics.

• Energy cannot be created or destroyed, only transformed.

• Energy can only be created from matter.

• Energy is always conserved in a closed system.

• Energy can be created and destroyed.

What is the principle of reflection in optics?

• The angle of incidence and reflection are always equal to 90 degrees.

• The angle of incidence is always greater than the angle of reflection.

• The angle of reflection is always zero degrees.

• The angle of incidence equals the angle of reflection.

Name the largest planet in our solar system.

• Jupiter

• Mars

• Earth

• Saturn

What is the atomic number of carbon in the periodic table?

• 5

• 7

• 12

• 6

What is the process of photosynthesis in plants?

• Photosynthesis is the process by which plants convert light energy into chemical energy, producing glucose and oxygen from carbon dioxide and water.

• Photosynthesis occurs only at night when plants release carbon dioxide.

• Photosynthesis is the process of plants absorbing nutrients from the soil.

• Photosynthesis is the method by which plants decompose organic matter.

Define the term 'ecosystem' in biology.

• A collection of plants in a garden.

• A single species of animal in a habitat.

• An ecosystem is a community of living organisms and their physical environment interacting as a system.

• The study of genetic variations in organisms.

What is the value of pi (π) to two decimal places?

• 3.14

• 2.14

• 3.15

• 3.141

What is the primary function of the CPU in a computer?

• To store data permanently

• To provide power to the computer

• To manage network connections

• The primary function of the CPU is to execute instructions and process data.

Explain the concept of entropy in thermodynamics.

• Entropy quantifies the total energy available for work in a system.

• Entropy is the total amount of heat in a thermodynamic process.

• Entropy is a measure of disorder and the unavailability of a system's energy to do work.

• Entropy is a measure of energy efficiency in a system.