CHEMISTRY (Part-I) (Railway)

1. The energy stored in a dry cell is [[RRB Allahabad Junior Clerk Exam, 04.01.2009 (1st Sitting)]

(1) electric
(2) chemical
(3) electro-chemical
(4) None of these

Correct Answer: (2) chemical

Solution:In electricity, a battery is a device consisting of one or more electrochemical cells that convert stored chemical energy into electrical energy.

2. When a solid state element Transforms in gas without intermediate liquid phase the process is known as. [Railway NTPC CBT Stage-1 Exam, (Graduate Level: 11-04-2016 (Shift-1)]

(A) Sublimation

(B) Vaposization

(D) Liquidation

(1) A
(2) B
(3) D
(4) C

Correct Answer: (1) A

Solution:Transformation of solid into gas without going through liquid state is known as "sublimation".

3. What is found in hard water? [RRC Hajipur Group 'D' Exam, 06.05.2012 (1st Sitting)]

(1) Calcium
(2) Aluminium
(3) Sodium
(4) Chlorine

Correct Answer: (1) Calcium

Solution:Hard water contains salt of calcium and magnesium.

4. Which rare gas is found in most plentiful or ample quantity? [Railway NTPC CBT Stage-1 Exam (Graduate Level: 11-04-2016 (Shift-1)]

(A) Helium

(B) Argon

(D) Nitrogen

(1) C
(2) B
(3) A
(4) D

Correct Answer: (2) B

Solution:In atmosphere Nitrogen gas is found in largest amount but it is not an inert gas Argon is third largest quantity gas after nitrogen and oxygen its quantity in atmosphere is 0.93%

5. Which of the following is NOT a property of acids? [RRB ALP & Technician Exam, 09.08.2018 Shift-III]

(1) Acids have sour taste
(2) Acids have bitter taste
(3) Acids form salts with bases
(4) Acids turn blue litmus red

Correct Answer: (2) Acids have bitter taste

Solution:Acids have a sour taste. An acid will turn litmus paper red. Acids also conduct electricity and react with bases to form water and salt.

6. In the process of __________ the Iron is protected by a coating of zinc. [RRB ALP & Technician Exam, 09.08.2018 Shift-III]

(1) greasing
(2) alloying
(3) galvanization
(4) anodizing

Correct Answer: (3) galvanization

Solution:Galvanisation is the process of applying a protective zinc coating to iron or steel, to prevent rusting. The most common method is hot dip galvanizing, in which steel sections are submerged in a bath of molten zinc.

7. What happens as we go down the group in the periodic table? [RRB ALP & Technician Exam, 09.08.2018 Shift-III]

(1) The number of shells decreases
(2) Valence electrons decreases
(3) The number of shells increases
(4) Atomic size decreases

Correct Answer: (3) The number of shells increases

Solution:The elements in the periodic table are arranged in order of increasing atomic number. The atomic radius usually increases while going down a group due to the addition of a new energy level (shell which causes shrinkage in the size of the atoms across the period).

8. Which of the following is an amphoteric oxide? [RRB ALP & Technician Exam, 09.08.2018 Shift-III]

(1) Aluminium oxide
(2) Iron (II) oxide
(3) Magnesium oxide
(4) Carbon dioxide

Correct Answer: (1) Aluminium oxide

Solution:An amphoteric oxide is an oxide that can act as either an acid or base in a reaction to produce a salt and water. Amphoterism depends on the oxidation states available to a chemical species. Because metals have multiple oxidation states, they form amphoteric oxides and hydroxides. Metals that display amphoterism include copper, zinc, lead, tin, beryllium, and aluminum.

9. The metal that can be cut with a knife is: [RRB ALP & Technician Exam, 10.08.2018 Shift-I]

(1) Copper
(2) Aluminium
(3) Iron
(4) Sodium

Correct Answer: (4) Sodium

Solution:Alkali metals like Lithium, sodium and potassium are all soft metals that can be easily cut with a knife. The freshly cut surface is a shiny, silver colour, but this tarnishes quickly to a dull grey as the metal reacts with oxygen and water present in the air.

10. The molecular formula of Pro-pane is: [RRB ALP & Technician Exam, 10.08.2018 Shift-I]

(1) CH₄
(2) C₄H₁₀
(3) C₃H₈
(4) C₂H₆

Correct Answer: (3) C₃H₈

Solution:Propane is a three-carbon alkane with the molecular formula C₂H₃. It is a gas at standard temperature and pressure, but compressible to a transportable liquid. A by-product of natural gas processing and petroleum refining, it is commonly used as a fuel. Propane is one of a group of liquefied petroleum gases (LP gases).