Q. The nucleus of an atom consists of
1) Electrons and neutrons
2) Electrons and protons
3) Protons and neutrons
4) All of the above
Q. A solution of zinc chloride cannot be stored in a vessel made of
1) Aluminium
2) Gold
3) Lead
4) Silver
Q. Which of the following statements about the use of radioactive isotopes is correct?
1) In medicine, they are used as tracers for diagnostic purposes
2) In industry, they are used to detect leak in water, oil and gas pipelines
3) They are used to determine the age of rocks and fossils
4) All of these statements are correct
Q. The branch of science, which is concerned with the study of chemical composition of the earth's crust and the changes which take place in it, is called
1) Biochemistry
2) Cytochemistry
3) Geochemistry
4) Geobiology
Q. Solder, which is used for soldering metal pieces, is an alloy of
1) Tin and zinc
2) Tin and lead
3) Zinc and lead
4) Zinc and copper
Q. Which of the following plays the central role in determining the chemical properties of atoms and molecules?
1) Electrons
2) Neutrons
3) Protons
4) All of these play equal role
Q. With 10-12 percent chromium, iron forms a very well-known alloy steel called
1) Silver steel
2) Mild steel
3) Plate steel
4) Stainless steel
Q. Of the three components of an atom, the smallest in mass is
1) Proton
2) Neutron
3) Electron
4) All these components have equal mass
Q. At room temperature, which of the following hydrocarbons is a liquid?
1) Butane
2) Ethane
3) Pentane
4) Propane
Q. As crops grow and are then harvested, the agricultural land suffers loss of certain elements. Which of the following is a primary nutrient?
1) Nitrogen
2) Phosphorus
3) Potassium
4) All of these
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