Which is faster?

Which color of light has the shortest wavelength?

What causes day and night?

What is the main source of energy for life on Earth?

Which of the following materials are good conductors of electricity?

Which of the following are types of mechanical waves?

Which of the following are examples of non-renewable energy sources?

Which of the following are forms of electromagnetic waves?

What instrument is used to measure how hot or cold something is?

I am the rate of doing work, measured in watts. What am I?