What is the principle of vaccination?

What is 4R principle?

What is the principle of capacitor?

What is the principle of PCR?

What is the basic principle of vaccination? How do vaccines prevent microbial infections? Name the organism from which hepatitis B vaccine is produced.

What is the principle of cyclotron?

What is the principle of centrifugation of mixtures ?

What is the principle of atom bomb?

What is the principle of an electric motor?