Railway/SSC JE 2019 Chemistry quiz for Phase I
Railway/SSC JE Chemistry quiz for (Phase I), RRB NTPC, SSC various exams and other competitive exams.
Q1. The conversion of hard water into soft water by boiling or adding calcium hydroxide is called _______.
(a) Baker’s process
(b) Temp’s process
(c) Clarke’s process
(d) Lake’s process
Q2. Concentration of water vapour in troposphere is –
(a) 04%
(b) 1014%
(c) 2024%
(d) 3034%
Q3. First country to impose carbon tax is ________.
(a) Australia
(b) Iceland
(c) USA
(d) New Zealand
Q4. In the following reaction, fill in the blank.
Acid + Base → _______ + Water
(a) Carbon dioxide
(b) Metal Oxide
(c) Hydrogen Gas
(d) Salt
Q5. Which of the following is a characteristic of an exothermic reaction?
(a) Release of heat
(b) Absorption of heat
(c) Doesn’t involve any change in temperature
(d) None of the option is correct
Q6.__________ acts as a shield absorbing ultraviolet radiation from the sun.
(a) Troposphere
(b) Stratosphere
(c) Mesosphere
(d) Ionosphere
Q7. ________ is made by mixing iron with carbon and metals like chromium, nickel and manganese.
(a) Ship
(b) Stainless Steel
(c) Rust
(d) Ozone
Q8. The salt concentration (measured as salinity in parts per thousand), is _______% in sea.
(a) 10-20
(b) 30-35
(c) 40-50
(d) 60-70
Q9.Fabric made from_________ does not get wrinkled easily.
(a) Cotton
(b) Flax
(c) Silk
(d) Polyester
Q10.What is formed when Carbon Dioxide is passed through Lime Water?
(a) Copper Sulphate
(b) Calcium Carbonate
(c) Magnesium Oxide
(d) Baking Soda
Solution
Ans.1.(c)
Exp. Clark’s method is a process for the large-scale removal of temporary hardness from water. Clark’s process involves the addition of a controlled quantity of slaked lime .
Ans.2.(a)
Exp. Water vapor is unique in that its concentration varies from 0-4% of the atmosphere depending on time of day.
Ans.3.(d)
Exp. New Zealand is first country to impose carbon tax.
Ans.4.(d)
Exp.When an acid and a base are placed together, they react to neutralize the acid and base properties, producing a salt. The H(+) cation of the acid combines with the OH(-) anion of the base to form water.
Ans.5.(a)
Exp. An exothermic reaction is a chemical reaction that releases energy by light or heat.
Ans.6.(b)
Exp. The stratosphere is the second major layer of Earth’s atmosphere, just above the troposphere, and below the mesosphere. Ozone in the stratosphere absorb ultraviolet light from the Sun, providing a shield that prevents this radiation from passing to the Earth’s surface.
Ans.7.(b)
Exp. Stainless Steel is made by mixing iron with carbon and metals like chromium, nickel and manganese.
Ans.8.(b)
Exp. Seawater in the world’s oceans has a salinity of approximately 3.5% or 35 parts per thousand.
Ans.9.(d)
Exp. Fabric made from Polyester does not get wrinkled easily.
Ans.10.(b)
Exp. Calcium Carbonate is formed when CO2 is passed through lime water.
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