General-Studies Quiz For FCI Phase I 2022- 27th December

Q1. Which is the rarest naturally occurring element of earth?
(a) Gold
(b) Antimony
(c) Germanium
(d) Astatine
(e) None of the above

Q2. The deficiency of which one of the following leads to dental caries?
(a) Iron
(b) Copper
(c) Fluorine
(d) Zinc
(e) None of the above

Q3. Which among the following elements (metals) pollutes the air of a city having large number of automobiles?
(a) Cadmium
(b) Lead
(c) Chromium
(d) Nickel
(e) None of the above

Q4. Which among the following is an element?
(a) Alumina
(b) Brass
(c) Graphite
(d) Silica
(e) None of the above

Q5. Which one of the following elements exists in liquid state at room temperature?
(a) Mercury
(b) Lead
(c) Sodium
(d) Calcium
(e) None of the above

Q6. The metal constituent of chlorophyll is
(a) Iron
(b) Potassium
(c) Manganese
(d) Magnesium
(e) None of the above

Q7. Which one of the following is correct? Setting of plaster of Paris is
(a) dehydration
(b) oxidation with atmospheric oxygen
(c) hydration leading to another hydrate
(d) combination with atmospheric CO2
(e) None of the above

Q8. Which one among the following does not have an allotrope?
(a) Oxygen
(b) Sulphur
(c) Nitrogen
(d) Carbon
(e) None of the above

Q9. Silicon is used in
(a) solar energy devices
(b) semiconductors
(c) transistors
(d) All of these
(e) None of the above

Q10. The kingdom Protista is primarily made up of organisms that are
(a) eukaryotic and multicellular
(b) prokaryotic and multicellular
(c) prokaryotic and single-celled
(d) eukaryotic and single-celled
(e) None of the above

Solutions

S1.Ans. (d)
Sol. The most rare naturally occurring element is known us astatine. An estimated 30 grams of Astatin (At) is available in Earth’s crust. It is radioactive and longest half-life of any of its isotope is 8 hours. It is a halogen and placed in the Gr-17 (VIIA) of the periodic table.

S2.Ans. (c)
Sol. Fluoride, which is obtained from the element fluorine, slows down the process of decaying of enamel of tooth. It stops the loss of calcium and phosphate of enamel when exposed to acid following ingestion of food and drinks which contain sugars.

S3.Ans. (b)
Sol. Tetra ethyl lead (C2H5)4Pb is used as an antiknock compound. It is mixed with petrol to improve its quality. Therefore automobile exhausts lead, which pollutes city.

S4.Ans. (c)
Sol. Graphite is an allotrope of carbon. Alumina (Al2O3) and silica (SiO2) are oxides and Brass is an alloy of Cu and Zn.

S5.Ans. (a)
Sol. Mercury exists in liquid state at room temperature. Bromine (Br) also exists as liquid at room temperature however it is a non-metal. Some other metals like caesium, gallium and rubidium exists as liquid slightly above room temperature.

S6.Ans. (d)
Sol. Chlorophyll is a green pigment in which at the centre of the ring is a magnesium ion. It also bears a long phytol chain.

S7.Ans. (c)
Sol. Setting of plaster of Paris is hydration leading to another hydrate.

S8.Ans. (c)
Sol. Unstable allotropes of nitrogen consisting of more than two nitrogen atoms have been produced in the laboratory, like N3 and N4. Under extremely high pressures (1.1 million atm) and high temperatures (2000 K), as produced under diamond anvil conditions, nitrogen polymerizes into the single bonded diamond crystal structure, an allotrope nicknamed “nitrogen diamond”.

S9.Ans. (d)
Sol. Silicon is a semiconductor which mean that unlike metal its electrical conductivity increases with temperature. As a semiconductor, silicon (Si) is used to make transistor which amplify or switch electrical currents.

S10.Ans. (d)
Sol. All single – celled eukaryotes are placed under Protista. This kingdom forms a link with others dealing with plants, animals and fungi.