The chemical formula for common table salt is:

The energy released when a substance burns in the presence of oxygen is called:

Which of these is not a renewable source of energy?

The hardest natural substance found on Earth is:

The study of heredity and variation in living organisms is called:

Sound cannot travel through:

Which gas is used in the preparation of soft drinks to add fizz?

The process by which plants lose water in the form of vapor is called:

The unit used to measure electric current is:

The pH value of pure water at room temperature is:

Which of the following diseases is caused by a virus?