EASY PSC | Kerala PSC 018/2023 - Station Officer (Trainee) Answer Key

Question 1

The dimension of coefficient of viscosity is

A

ML⁻¹T⁻¹

B

MLT⁻¹

C

ML⁻¹T

D

ML⁻¹T⁻²

Question 2

The radioactive element Neptunium (₉₃Np²³⁹) emits which particle to form Plutonium

A

α particle

B

β particle

C

γ particle

D

positron

Question 3

Which of the following is true in the case of hexagonal crystal systems ?

A

a = b ≠ c, α = β = 90°, γ = 120°

B

a = b = c, α = β = γ ≠ 90°

C

a ≠ b ≠ c, α ≠ β ≠ γ ≠ 90°

D

a ≠ b ≠ c, α = β = 90°≠ γ

Question 4

In the case of L – S coupling scheme when L > S, J can have

A

(2S + L) values

B

(2L + 1) values

C

(2L + S) values

D

(2S + 1) values

Question 5

Lyman spectral series of hydrogen atom lies in which region of the electromagnetic spectrum ?

A

Ultraviolet region

B

Infra-Red region

C

Visible region

D

Radio waves

Question 6

Which of the following are not the conditions to produce Haidinger fringes ?
i. The source must be an extended source.
ii. The source must be a narrow source.
iii. The film thickness must be appreciably large.
iv. The film thickness must be very small.
v. The observing instrument is to be focused for parallel rays.

A

Only (i, iii and iv)

B

Only (ii, iv and v)

C

Only (ii and iv)

D

Only (iv and v)

Question 7

Which of the following statements are correct in accordance with the first law of Thermodynamics ?
i. It is applicable to any process by which a system undergoes a physical change.
ii. It is applicable to any process by which a system undergoes a chemical change .
iii. It introduces the concept of internal energy.
iv. It does not provide a method for determining the change in internal energy.

A

i, ii and iii

B

i, iii and iv

C

i, ii and iv

D

ii, iii and iv

Question 8

The angle of contact depends on
i. The nature of the liquid.
ii. The solid with which it is in contact.
iii. The purity of solid and liquid.
iv. Nature of the vapour.

A

i, ii and iii

B

ii, iii and iv

C

i, ii, iii and iv

D

i, iii and iv

Question 9

Which of the following is the relation between numerical aperture and acceptance angle in the case of optical fibre communication ? Symbols have the usual meaning

A

Sinθ₀ = n₀(n²₁ – n²₂)¹/²

B

Sinθ₀ = n₀⁻¹(n²₁ – n²₂)¹/²

C

Sinθ₀ = n₀⁻¹(n²₁ – n²₂)²

D

n₀⁻¹ Sinθ₀ = (n²₁ – n²₂)¹/²

Question 10

In Fraunhoffer single slit diffraction pattern, a screen is placed 1m away from the lens to obtain the pattern. Which is the wavelength of light if the slit width is 0.2 mm and the first minima lie 2.5 mm on either side of the central maximum ?

A

4500 Å

B

5500 Å

C

4000 Å

D

5000 Å

Question 11

A Carnot’s engine working between 127°C and 27°C absorbs 60 cals of heat. How much heat is rejected ?

A

65 cals

B

45 cals

C

35 cals

D

25 cals

Question 12

What is the ratio of extension produced in the wires of the same material, subjected to a force in the ratio of 4 : 1 and their lengths and radius are in the ratio of 1 : 16 and 1 : 4 respectively ?

A

2 : 1

B

1 : 2

C

1 : 4

D

1 : 1

Question 13

The correct order of bond angles in NH₃, PH₃, AsH₃ and SbH₃ is

A

PH₃ > NH₃ > AsH₃ > SbH₃

B

NH₃ > PH₃ > AsH₃ > SbH₃

C

SbH₃ > AsH₃ > PH₃ > NH₃

D

AsH₃ > SbH₃ > PH₃ > NH₃

Question 14

Choose the correct answer with respect to the measurement of hardness of water by complexometric titration, carried out using Eriochrome black as indicator in a buffered solution of pH around 10.

A

Magnesium-indicator complex is more stable than magnesium-EDTA complex

B

At the end point, the colour changes from blue to red

C

At the end point, colour of the solution is due to the mg-indicator complex

D

Magnesium-EDTA complex is more stable than the magnesium-indicator complex

Question 15

The number of radial nodes present in 4Px orbital is

A

4

B

3

C

2

D

1

Question 16

Which of the following set of quantum numbers is allowed ?

A

n = 3, l = 3, m₁ = -2

B

n = 4, l = 1, m₁ = -2

C

n = 4, l = 3, m₁ = -3

D

n = 4, l = 4, m₁ = -3

Question 17

Octane number of 2, 2, 4 -trimethyl pentane is

A

0

B

50

C

70

D

100

Question 18

Which statement about carbocation is not correct ?

A

Carbocation is an intermediate in Pinacol-Pinacolone rearrangement

B

Carbocation is a group of atoms that contain a carbon atom bearing only six electrons

C

Carbocation is an intermediate in SN1 reactions

D

Order of stability of carbocations is 1° > 2° > 3°

Question 19

Which polymer is used for making bullet proof vests ?

A

Poly(p-phenylene terephthalamide)

B

Polycaprolactam

C

Polymethylmethacrylate

D

Polycaprolactone

Question 20

The compound that shows positive iodoform test is

A

A)

B

B)

C

C)

D

D)

Question 21

At 298 K, 0.2 mol of ammonium acetate and 0.1 mol of acetic acid are dissolved in 1L of water. The pH of resulting solution is (Given pKa of acetic acid is 4.75)

A

4.75

B

5.05

C

4.44

D

3.92

Question 22

In a saturated calomel electrode, the saturation is with respect to

A

AgCl

B

HgCl₂

C

Hg₂Cl₂

D

KCl

Question 23

Calculate the temperature at which the average velocity of oxygen equals that of hydrogen at 10K.

A

200 K

B

160 K

C

320 K

D

300 K

Question 24

What is the percent transmittance of a solution with absorbance (optical density) 1.0 ?

A

100

B

10

C

1

D

0.1

Question 25

Nyctalopia is a disorder which occurs due to the deficiency of

A

Vitamin D

B

Vitamin K

C

Vitamin A

D

Vitamin C

Question 26

Which part of conducting system of heart is known as cardiac pacemaker ?

A

A V node

B

Bundle of His

C

Purkinje fibres

D

S A node

Question 27

low level of Oxyhemoglobin in blood enables it to transport more Carbondioxide.
This phenomenon is

A

Bohr effect

B

Counter current effect

C

Haldane effect

D

Summation effect

Question 28

Functional contractile unit of muscle is

A

Telomere

B

Sarcomere

C

Dendromere

D

None of these

Question 29

During depolarization of a nerve fibre as first step there occurs

A

Movement of Sodium ions from exterior to interior axoplasm

B

Movement of Sodium ions from axoplasm to exterior

C

Movement of Potassium ions to the exterior from axoplasm

D

Movement of Potassium ions from exterior to axoplasm

Question 30

After analyzing the karyotype of an abnormal new born baby doctor diagnosed that he is having Edwards syndrome. The reason is

A

Trisomy 21

B

Trisomy 13

C

Trisomy 18

D

Trisomy 15

Question 31

According to National Immunization Schedule which Vaccine is scheduled to be given at 10 and 16 years of age

A

BCG

B

MMR

C

DPT

D

TT

Question 32

Which of the following is not an autoimmune disorder ?

A

Grave’s disease

B

AIDS

C

Type 1 diabetes

D

Rheumatoid arthritis

Question 33

The antibody capable of crossing placental barrier is

A

Ig G

B

Ig E

C

Ig M

D

Ig A

Question 34

In a eukaryotic cell Krebs cycle takes place in

A

Cytoplasm

B

Endoplasmic reticulum

C

Mitochondrial matrix

D

Lysosome

Question 35

Number of base pairs per turn in B form of DNA is

A

11

B

9

C

10

D

12

Question 36

Which one of the following is adrenal disorder ?

A

Cushing syndrome

B

Myxedema

C

Acromegaly

D

Grave’s disease

Question 37

The chemical compound present in middle lamella is

A

Calcium pectate

B

Polylactic acid

C

Gelatin

D

Gum-arabic

Question 38

Sunken stomata are present in

A

Epiphytes

B

Parasites

C

Xerophytes

D

Hydrophytes

Question 39

Casparian thickening is present on

A

Epidermis

B

Hypodermis

C

Endodermis

D

Exodermis

Question 40

Inflorescence in clerodendrum is a

A

Cymule

B

Dichasial cyme

C

Solitary cyme

D

Monochasial cyme

Question 41

An example for sorosis type of fruit is

A

Jackfruit

B

Polyalthia

C

Orange

D

Annona

Question 42

Absorption of water by solid and hydrophilic constituents of the cell wall by surface attraction is called

A

Adhesion

B

Cohesion

C

Guttation

D

Imbibition

Question 43

The light harvesting photosynthetic units present in thylakoid membrane are called

A

Quantosomes

B

Phytochrome

C

Ferredoxine

D

Antinae molecules

Question 44

2, 4 dichlorophenoxy acetic acid belongs to

A

Gibberline

B

Antiauxine

C

Synthetic auxin

D

Auxin

Question 45

The binomial nomenclature of coconut is

A

Elais quineensis

B

Borassus flabellifer

C

Artocarpus Heterophyllus

D

Cocos nucifera

Question 46

The long cotton hair obtained from Gossypium herbaceum is

A

Lodicule

B

Lemna

C

Lint

D

Fuzz

Question 47

Select the species endangered in India.

A

Green sea turtle

B

Dodo

C

Passenger pigeon

D

Pink headed duck

Question 48

Select the primary air pollutant.

A

smog

B

tropospheric ozone

C

peroxyacyl nitrate

D

ethylene

Question 49

A

2

B

3

C

4

D

5

Question 50

Which of the following sets of vectors are bases for ℝ² ?

A

{(0, 1), (1, 1)}

B

{(0, 1), (1, 0)}

C

{(0, 0), (1, 1)}

D

{(1, 1), (1, 0)}

Question 51

If z̄ is the conjugate of z, then

A

|z̄| = |z|

B

|z̄| < |z|

C

|z̄| > |z|

D

None of these

Question 52

If z̄ is the conjugate of z, then

A

Re z = ½ (z + z̄)

B

Re z ½ (z - z̄)

C

Re z = ½ z̄

D

Re z = ½ z

Question 53

The distance between the points P(–7, 2) and Q(5, –3) is

A

15

B

14

C

13

D

12

Question 54

The limit of (x² – 4x + 3) as x → 5 is

A

10

B

7

C

8

D

12

Question 55

The limit of 7x⁵ – 4x³ + 2x – 9 as x → –∞ is

A

+ ∞

B

– ∞

C

0

D

None of these

Question 56

Ordinary Differential Equation involves

A

Only one independent variable

B

Only two independent variable

C

Infinite independent variable

D

None of these

Question 57

Divergence and Curl of a vector field are

A

Scalar and Scalar

B

Scalar and Vector

C

Vector and Vector

D

Vector and Scalar

Question 58

The curl of vector field F(x, y, z) = x²i + 2zj – yk is

A

–3i

B

–3j

C

–3k

D

0

Question 59

The identity permutation is

A

Odd permutation

B

Even permutation

C

Neither even nor odd

D

None of these

Question 60

let G be a group and a∈G. If the order of a is n and order of aᵖ is m, then

A

m = 0

B

m ≥ n

C

m ≤ n

D

None of these

Question 61

Which of the following is HazChem code of LPG ?

A

2RE

B

2SE

C

2WE

D

2P

Question 62

A Chemical added to give odour to detect LPG leaks

A

Ethyl Mercaptan

B

Methyl Mercaptan

C

Pottassium Chloride

D

Aluminium Stearate

Question 63

The process of extinguishing a fire by stopping/limiting the supply of oxygen using blankets, sand, etc. is called

A

Cooling

B

Starvation

C

Blanketing

D

Mitigation

Question 64

As per Indian Standards Fire in metals is under the category of _______ Fire.

A

Class A

B

Class B

C

Class C

D

Class D

Question 65

Major constituent chemical in ABC dry chemical powder is

A

Mono ammonium phosphate

B

Ethyl methyl acetate

C

Sodium bicarbonate

D

Sulphur dioxide

Question 66

What is the colour of the sprinkler bulb of sprinkler system operating at 79 degree Celsius ?

A

Green

B

Blue

C

Red

D

Yellow

Question 67

What is the working principle of hydraulic equipments ?

A

Centrifugal force

B

Newton laws

C

Pascal’s law

D

Charle’s law

Question 68

What type of pump is used mainly in Fire engines ?

A

Rotary

B

Centrifugal

C

Plunger

D

All the above

Question 69

The yellow colour in the NFPA Hazard diamond denote the following hazard of the material

A

Flammability

B

Health

C

Reactivity

D

Specific hazard

Question 70

CPR stands for

A

Cardio Pulmonary Rescue

B

Cardio Pulmonary Resuscitation

C

Critical Patient Rescue

D

Cardio Patient Rescue

Question 71

Heating effect of current is not directly dependant on

A

Current

B

Resistance

C

Time of flow

D

Pressure

Question 72

As per Indian Standards Class C fire refers to

A

Fire in liquids

B

Fire in gases

C

Fire in solids

D

None of these

Question 73

Emergency information panel doesn’t consist

A

Class label

B

Vehicle number

C

UN Number

D

Specialist advice

Question 74

The chemical constituents of TEC powder

A

Sodium Chloride, Potassium Chloride, Barium Chloride

B

Sodium Chloride, Calcium Chloride, Barium Chloride

C

Sodium Chloride, Calcium Chloride, Potassium Chloride

D

Sodium Chloride, Calcium Chloride, Magnesium Chloride

Question 75

The acronym BLEVE stands for

A

Boiling Liquid Expanding Vapour Explosion

B

Boiling Liquid Exploding Vapour Expansion

C

Boiling Liquid Emitting Vapour Explosion

D

Boiling Liquid Exploding Vapour Emission

Question 76

Dry ice is chemically

A

Calcium Chloride

B

Solid Carbon Dioxide

C

Magnesium Sulphate

D

Sodium Chloride

Question 77

Which of the following does not undergo sublimation ?

A

Solid Iodine

B

Dry ice

C

Silica

D

Camphor

Question 78

The most efficient shield against radioactive emissions

A

Lead

B

Aluminium

C

Glass

D

Steel

Question 79

The efficiency of fire pump can be denoted as

A

Efficiency = Water power / Brake power

B

Efficiency = Brake power / Water power

C

Efficiency = Pressure / Head

D

Efficiency = Head / Pressure

Question 80

LEL stands for

A

Lower Expansion Limit

B

Lower Explosive Limit

C

ower Extinguishing Limit

D

Lower Extinguishing Level

Question 81

Who among the following was nominated twice to the Sri mulam Popular Assembly as a representative of the dalits in 1921 and 1931 ?

A

Kumara Guru

B

Moorkoth Kumaran

C

Chathan Master

D

K. Kelappan

Question 82

Name the newspapers published by Herman Gundert

A

Rajyasamacharam and Paschimodayam

B

Vivekodayam and Prabhatham

C

Malayalee and Rajyasamacharam

D

Vivekodayam and Malayalee

Question 83

In which session of the Congress of 1923, T.K. madhavan moved a resolution for the eradication of untouchability in Kerala ?

A

Delhi

B

Kakinada

C

Belgaum

D

Bombay

Question 84

The work “Pingala” is written by

A

Kuttimalu Amma

B

Anna Chandi

C

Ulloor S Parameswara Iyer

D

Kesav Dev

Question 85

K.V. Unni was associated with

A

Vaikom Satyagraha

B

Paliyam Satyagraha

C

Kuttamkulam Satyagraha

D

None of these

Question 86

The project named “Cosmos malabaricus” was signed between Kerala and

A

Portugal

B

Netherlands

C

Britain

D

Russia

Question 87

Citizen Constitution literacy Campaign, aimed at educating everyone above the age of 10 years about the basic principles of the Constitution was launched at

A

Ernakulam

B

Kozhikode

C

Thiruvananthapuram

D

Kollam

Question 88

The first Indian Superintendent of Calicut lunatic Asylum was

A

Ayyathan Gopalan

B

T.K. Madhavan

C

Krishna Pillai

D

G.P. Pillai

Question 89

The journal called Paropakari was published by

A

E.K. Moulavi

B

Vakkom Abdul Khadar Moulavi

C

Makti Thangal

D

Muhammad Hamadani Thangal

Question 90

Under whose instruction, the Travancore Government issued orders permitting the Channar women to wear jacket and pinafore made of raw cotton ?

A

Daniel Eliott

B

Sir Henry Ward

C

Francis Napier

D

Charles Trevelyan

Question 91

Find out the memory which possesses all of the following features.
i. A small high speed buffer memory to hold instructions temporarily during processing.
ii. Reduce the waiting time of the CPU.
iii. A temporary storage area where frequently accessed data can be stored for rapid access.
iv. Transparent or invisible to the processor.

A

Register

B

Cache memory

C

RAM

D

ROM

Question 92

Which of the following is/are correct about Non-Impact Printer ?
i. It has the ability to produce carbon copies.
ii. The print head of printer uses small pins, which strike on the paper to create a character or image.
iii. They use thermal, electrostatic, chemical or inkjet technology to produce printed output.

A

Only (iii)

B

Only (i and ii)

C

Only (i and iii)

D

All of the above (i, ii and iii)

Question 93

The software that manages computer’s memory, processes and its hardware is called

A

Application software

B

Personal computer software

C

Operating system

D

Driver software

Question 94

Which of the following functions can be performed with the help of spreadsheets ?
1. Maintaining records.
2. Creating videos.
3. Analysing data.
4. Performing financial calculations.
5. Writing letters.

A

1, 2, 3, 4, 5

B

1, 3, 4

C

1, 3, 5

D

3, 4, 5

Question 95

__________ is an unlawful activity where fake websites or emails that look original or authentic are presented to the user to fraudulently collect sensitive and personal details, particularly usernames, passwords, banking and credit card details.

A

Denial-of-service

B

Spamming

C

Hacking

D

Phishing

Question 96

Which among the following was established under IT Act, 2000 to resolve disputes arising from the law ?

A

Cyber Administrative Tribunal

B

Technology Disputes Tribunal

C

Cyber Appellate Tribunal

D

IT Disputes Tribunal

Question 97

Which type of network is used in Cable Television Network ?

A

LAN

B

MAN

C

WAN

D

PAN

Question 98

A _________ is a passage to connect two networks together that may work upon different networking models.

A

Router

B

Modem

C

Bridge

D

Gateway

Question 99

The correct sequence of HTMl tags for starting a webpage is

A

Head, Title, HTML, Body

B

HTML, Body, Title, Head

C

HTML, Head, Title, Body

D

HTML, Title, Head, Body

Question 100

Which of the following is a popular search engine ?

A

YouTube

B

Twitter

C

D

Google