The device used to convert mechanical energy into electrical energy is:

The main gas responsible for global warming is:

Which of the following is an example of a chemical change?

Which scientist discovered the law of gravitation?

The number of bones in an adult human body is:

The condition in which blood sugar levels are abnormally high is called:

Which of the following is used in vaccines to build immunity?

Which of the following is the powerhouse of the cell?

The primary source of energy for most ecosystems is:

Which of the following is used to test for the presence of starch?

Which of the following gases is used in fire extinguishers?