Q1. At room temperature, which element conducts electricity better than any other element?
(a) Pb
(b) Au
(c) Ag
(d) Cu
Q2. The candela is one of the seven base units in the SI system. It measures…?
(a) Magnetism
(b) Luminous intensity
(c) Combustion rate
(d) Luminance
Q3.Yeast is an important source of
(a) Vitamin B
(b) vitamin C
(c) vitamin A
(d) vitamin D
Q4. What scientist discovered the radioactive element radium?
(a) Isaac Newton
(b) Albert Einstein
(c) Benjamin Franklin
(d) Marie Curie
Q5. Who invented Bakelite?
(a) Charles Goodyear
(b) Leo Baekeland
(c) Roy Plunkett
(d) Henry Ford
Q6.Often to prevent corrosion, metals are galvanized by covering them with a layer of
(a)Copper
(b)Zinc
(c)Sodium
(d)Tin
Q7. Paraffin wax is
(a) Ester
(b) Alcohol
(c) Unsaturated hydrocarbon
(d) Saturated hydrocarbon
Q8. Which of the following does not belong to this group?
(a) Iron
(b) Sodium
(c) Oxygen
(d) Lead
Q9.Which metal is extracted from Haematite?
(a)Tin
(b)Manganese
(c)Iron
(d)Cadmium
Q10. Which of the following is a pure substance made up of two or more types of atoms or elements?
(a) A mixture
(b) An element
(c) A compound
(d) An atom
Q11. Which among the following is used to dilute oxygen in the gas cylinders used by divers?
(a) Helium
(b) Neon
(c) Krypton
(d) Argon
Q12. Which one of the following does not form oxyacid?
(a) Nitrogen
(b) Fluorine
(c) Sulphur
(d) Chlorine
Q13. Which of the following has zero electron affinity?
(a) Oxygen
(b) Fluorine
(c) Nitrogen
(d) Neon
Q14. Aluminium is obtained by the electrolysis of pure AL_2 O_3 dissolved in
(a) Bauxite
(b) Cryolite
(c) Feldspar
(d) Alumina
Q15. Threshold limit value of copper in the atmosphere air is
(a) 0.001 mg/m^3
(b) 0.01 mg/m^3
(c) 1.0 mg/m^3
(d) 5.0 mg/m^3
