Phosphorus is an essential component of one of the following biological molecules:

A. Amino acids
B. Nucleic acids
C. Carbohydrates
D. None

Atom is made up of____________different kinds of subatomic particles:

A. Three
B. Two
C. Four
D. None

The alpha particles are compact clusters of______________?

A. Electron and proton
B. Two protons and two neutrons
C. Three protons and three neutrons
D. None

The Beta particles are fast moving___________?

A. Protons
B. Electrons
C. Neutrons
D. None

The unit to measure the quantity of Ozone in atmosphere is?

A. Dobson
B. Dalton
C. Cuolomb
D. None

Geiger-Muller counter is used to detect__________?

A. Protons
B. Neutrons
C. Photons
D. None

Vacuum tubes have been replaced by__________?

A. Conductors
B. Diodes
C. Transistors
D. None of these

It is a secondary plant nutrient?

A. Nitrogen
B. Phosphorus
C. Sulphur
D. None

The number of electrons of a neutral atom is automatically known if one knows the?

A. Atomic number
B. Atomic weight
C. Number of orbitals
D. None

Which of the following is not an enzyme?

A. Chemotrypsin
B. Secretin
C. Pepsin
D. None