1621. Phosphorus is an essential component of one of the following biological molecules :

A. Amino acids
B. Nucleic acids *
C. Carbohydrates
D. None of these

1622. He was the first scientist to prove that plants move around the sun :

A. Archimedes
B. Galileo Galilee
C. John Kepler *
D. None of these

1623. Atom is made up of __________ different kinds of subatomic particles:

A. Three *
B. Two
C. Four
D. One

1624. Uranium is best used as nuclear fuel in one of the following forms :

A. U235 *
B. U237
C. U238
D. None of these

1625. 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 of these

1626. The beta particles are fast moving :

A. Portons
B. Electrons *
C. Neutrons
D. None of these

1627. One of the following countries produces maximum energy from atomic reactors :

A. France *
D. None of these

1628. The unit to measure the quantity of Ozone in atmosphere is :

A. Dobson *
B. Dalton
C. Coulomb
D. None of these

1629. The severity of 2005 Earthquake in pakistan on Richter scale was :

A. 6.9
B. 7.6 *
C. 7.1
D. None of these

1630. Geiger-Muller counter is used to detect :

A. Protons
B. Neutrons
C. Photons *
D. None of these