1431. Rusting of iron requires :
A. Oxygen only
B. Oxygen and carbon dioxide
C. Oxygen and water *
D. Carbon dioxide only
1432. Uranium eventually decays into a stable isotopes of :
A. Lead *
B. Polonium
C. Thorium
D. Radium
1433. Which of the following contains high content of lead ?
A. Low octane fuel
B. High octane fuel *
C. Coal
D. Cooking gs
1434. What the main particles of an atom are ?
A. Neutron,electron,and proton *
B. Proton and electron
C. Proton,electron and neutron
D. Proton and Neutron
1435. Which particles of atom has a positive charge ?
A. Proton *
B. Neutron
C. Electrons
D. None of these
1436. Which particle of atom has no charge ?
A. Proton
B. Neutron *
C. Electrons
D. None of the above
1437. Which particles of atom has a negative charge ?
A. Proton
B. Neutron
C. Electron *
D. None of the above
1438. Which are on the outer Orbit ofa a atom ?
A. Proton
B. Neutron
C. Electrons *
D. None of these
1439. Which of the following is not a mixture ?
A. Lpg
B. Air
C. Gasoline
D. Distilled water *
1440. It is an industrial process of producing ammonia by the reaction of nitrogen with hydrogen in the presence of a catalyst :
A. Solvay process
B. Haber process *
C. Bessemer process
D. Bayer process