Chemistry Previous Question Answers PSC, UPSC, SSC, IBPS

Chemistry Previous Questions from PSC, UPSC and SSC

Which one of the following functional ingredients improves gastrointestinal health
and also calcium absorption ?
Asked : SSC MPSC Food Safety Officer Food and Medicine Administration Gr-B 2016
AFructo-oligosaccharides

BDaidzein
CSterols
DPUFA

Which one is the poorest method of food freezing ?
Asked : SSC MPSC Food Safety Officer Food and Medicine Administration Gr-B 2016
AFreezing in cold air blast
BFreezing with liquid air, Nz or COz
CFreezing in still air

DFreezing by direct immersion of food in a cooling medium

The difference in UHT pasteurized milk and extended shelf life treated pasteurized
milk is of
Asked : SSC MPSC Food Safety Officer Food and Medicine Administration Gr-B 2016
ATemperature of heating
BHolding time
CMicrobial filtration

DNone of the above

The post harvest transportation and storage of banana for distant marketing with
minimum chilling injury is carried out at what temperatures ?
Asked : SSC MPSC Food Safety Officer Food and Medicine Administration Gr-B 2016
A1-7 °C
B8 - 10 °C
C11 - 13 °C

D14 - 17 °C

Fruits and vegetables based soups and sauces are categorized as
Asked : SSC MPSC Food Safety Officer Food and Medicine Administration Gr-B 2016
Alow acid foods
Bmedium acid foods

Cacid foods
Dhigh acid foods

The most common adulterant used in coffee is
Asked : SSC MPSC Food Safety Officer Food and Medicine Administration Gr-B 2016
AChicory

BTamarind
CDate seed powder
DAll of the above

The most susceptible mineral lost during cooking of food on the basis of presence as
free ions is
Asked : SSC MPSC Food Safety Officer Food and Medicine Administration Gr-B 2016
ACalcium
BIron
CPotassium

DNone of the above

The most susceptible to oxidation in a protein molecule are the SH groups of which
amino acid ?
Asked : SSC MPSC Food Safety Officer Food and Medicine Administration Gr-B 2016
ACysteine

BValine
CThreonine
DGlycine

Arrange the following compounds in the increasing order of their UV absorption
maxima :

a. Ethylene b. Naphthalene
c. Anthracene d. 1, 3-Butadiene
Choose the correct order.
Asked : SSC MPSC Food Safety Officer Food and Medicine Administration Gr-B 2016
Aa < b < c < d
Ba < d < c < b

Cc < d < a < b
Dd < c < b < a
Explanation:

The correct IUPAC name for the following compound is
Asked : SSC MPSC Food Safety Officer Food and Medicine Administration Gr-B 2016
A2-chloro-5-fluoro-1 hydroxybenzene
B1-hydroxy-2-chloro-5-fluorobenzene
C1-fluoro-3-hydroxy-4-chlorobenzene
Dnone of these

What is the major product in the following reaction ?
Asked : SSC MPSC Food Safety Officer Food and Medicine Administration Gr-B 2016
A
B

Three flasks A, B and C respectively contain 0.1 M, 0.1 m and 0.1 N aqueous HC1
solutions, prepared at 40°C. Considering the density of water = 1 &/CM³ at 4⁰C,
which of the following statements is/are correct ?
a. Concentration of all three solutions is exactly the same.
b. Concentration of HCL in flask A and flask C is exactly the same.
c. Concentration of HCL in flask B is lesser than concentration of HCL in flasks A
and C.
d. No two flasks have HCl of exactly the same concentration.
Asked : SSC MPSC Food Safety Officer Food and Medicine Administration Gr-B 2016
Aa only
BBoth band c

Cc only
Dd only

Match the columns :
Group I Group II
a. Surfadants I. Alkylaryl sulphonates
b. Dye intermediates II. Benzene
c. Lacquers III. Cellulose acetate
d. Solvents IV. Ethyl acetate
V. Anthracene
Asked : SSC MPSC Food Safety Officer Food and Medicine Administration Gr-B 2016
AA-I,III ,B-V, C-III,IV, D-I,II,IV
BA-I, B-II,V, C-III, D-II,IV

CA-I, B-IV, C-III,IV, D-II,IV
DA-I,III, B-V, C-III, D-II,IV

The correct order of increasing stability of carbonium ion is
Asked : SSC MPSC Food Safety Officer Food and Medicine Administration Gr-B 2016
Atertiary > secondary > primary

Bprimary > secondary > tertiary
Csecondary > tertiary > primary
Dprimary > tertiary > secondary

Which of the following is the best method for preparation of common detergent
sodium dodecyl benzene sulphonate (C) ?
Asked : SSC MPSC Food Safety Officer Food and Medicine Administration Gr-B 2016
A

Which chemical is used in seeding clouds for artificial rain
Asked : TNPSC Superintendent, Garments And Holdall Making Unit 2017
ASodium hydroxide
BDuralium
CCFC
DPotassium iodide

Energy currency of the cell is
Asked : TNPSC Superintendent, Garments And Holdall Making Unit 2017
AATP

BADP
CNADP
DNADPH₂

What is the percentage composition of carbon in steel
Asked : TNPSC Superintendent, Garments And Holdall Making Unit 2017
A0.15% - 1%
B0.25% - 2%

C0.35% - 3%
D0.9% - 9%

................ play an important role in the fomation of spindle fibres during cell division.
Asked : TNPSC Superintendent, Garments And Holdall Making Unit 2017
Achromosomes
Bchloroplasts
Ccentrioles

DIysosomes

Air polluting photochemical smog, PAN is
Asked : TNPSC Superintendent, Garments And Holdall Making Unit 2017
APara acetyl nitrate
BPeroxy acetyl nitrate

CPeroxy acetyl nitrite
DPara acetyl nitrite

Which is the stronges acid in the world
Asked : TNPSC Superintendent, Garments And Holdall Making Unit 2017
ASulphuric acid
BHydrochloric acid
CNitric acid
DFluoro sulphuric acid

Specific heat capacity of water is how many times more than the specific heat capacity of mercury
Asked : TNPSC Superintendent, Garments And Holdall Making Unit 2017
A20
B40
C30

Choose the micronutrient needed for plant growth
Asked : TNPSC Posts included in CCS-I 2017
AOxygen
BHydrogen
CNitrogen
DZinc

Among the following salts, which is a salt of weak acid and strong base
Asked : TNPSC Posts included in CCS-I 2017
ANH₄Cl
BCH₃COONH₄
CNaCN

DNaCl

Match the following algal pigments with their colour :

Pigment Colour

a) Chlorophyll 1. Orange

b) Xanthophyll 2. Green

c) Carotenoid 3. Blue green

d) Phycocyanin 4.Yellow
Asked : TNPSC Posts included in CCS-I 2017
AA-2, B-4,C-3, D-3

BA-2, B-4, C-3, D-1
CA-1, B-2, C-3, D-4
DA-4, B-1, C-3, D-2

Which enzyme catalyze the conversion of Pyruvic Acid into Acetyl co-enzyme A in the respiratory process
Asked : TNPSC Posts included in CCS-I 2017
APyruvic acid oxidase
BPyruvate synthetase
CAconitase
DPyruvate Dehydrogenase

Which of the following is a wrong statement
Asked : TNPSC Posts included in CCS-I 2017
AAll the minerals are not ores
BAll the ores are not minerals

CAll the ores are minerals
DFrom ores, metals can be extracted economically

An acid is a substance that can lose a proton is called
Asked : TNPSC Posts included in CCS-I 2017
AArrhenius concept
BBronsted-Lowry concept

CLewis concept
DUsanovich concept

The aqueous solution of potassium chloride is
Asked : TNPSC Posts included in CCS-I 2017
Aa weak electrolyte
Ba strong electrolyte

Ca non-electrolyte
Dinitially weak and then become a strong electrolyte

The citric acid produced during Kreb cycle contains
Asked : TNPSC Psychologist in various services 2017
ATwo carboxylic groups
BThree carboxylic groups

CFour carboxylic groups
DOne carboxylic groups

Pigment	Colour
a) Chlorophyll	1. Orange
b) Xanthophyll	2. Green
c) Carotenoid	3. Blue green
d) Phycocyanin	4.Yellow