EASY PSC | 006/2023 - Junior Lab Assistant Answer Key Published

Question 1

Acid present in chromic acid solution is

A

Phosphoric Acid

B

Nitric Acid

C

Hydrochloric Acid

D

Sulphuric Acid

Question 2

Beer-Lambert law is applied in the instrument

A

Microscope

B

Colorimeter

C

pH meter

D

Incubator

Question 3

Laboratory incubator is usually set with a temperature of

A

8°C

B

56°C

C

100°C

D

37°C

Question 4

Which of the following is used to keep chemicals free from water ?

A

Hot air oven

B

Desiccators

C

Incubator

D

Seitz filter

Question 5

Bleaching powder is prepared from

A

Benzaldehyde

B

Gluteraldehyde

C

Hypochlorite

D

Sodium chloride

Question 6

Solution in which no more salt is able to dissolve is

A

Saturate solution

B

Percent solution

C

Molar solution

D

Standard solution

Question 7

Which of the following is an inflammable chemical ?

A

Xylene

B

Chloroform

C

Alcohol

D

All the three

Question 8

Reverse osmosis is used to prepare

A

Disinfectants

B

Deionised water

C

Distilled water

D

None of these

Question 9

Example for a chemical that is kept under water

A

Sodium

B

Picric acid

C

Calcium carbonate

D

Sodium hypochlorite

Question 10

Hospital wastes like used syringe, needle etc. are stored in which coloured bin ?

A

Red

B

Yellow

C

White

D

Blue

Question 11

ABO blood group system was introduced by

A

Antonie Van Leeuwenhoek

B

Robert Frost

C

Louis Pasteur

D

Karl Landsteiner

Question 12

In ACD solution erythrocytes get energy from

A

Glucose

B

Citric acid

C

Citrate

D

Haemoglobin

Question 13

Which of the following is not investigated during donor selection in blood bank ?

A

Hb

B

Weight of donor

C

Relationship with patient

D

Pulse

Question 14

Vaccutainer with red top containg

A

Heparin

B

EDTA

C

No anticoagulant

D

Sodium citrate

Question 15

Which anticoagulant inhibit thrombin ?

A

Double oxalate

B

EDTA

C

Citrate

D

Heparin

Question 16

Which type of the cells present in a healthy adult as 3 lakhs/cu mm of blood ?

A

RBC

B

Platelets

C

Neutrophils

D

Agranulocytes

Question 17

Leishman stain is an example for

A

Romanowsky stains

B

Acidic stains

C

Basic stains

D

Supravital stains

Question 18

RBCs are lysed by acetic acid in

A

Piolets fluid

B

Hinglemans fluid

C

Turkes fluid

D

Dacies fluid

Question 19

In a centrifuged blood sample, WBC appear

A

As a top layer

B

As a bottom layer

C

Between RBC and platelet

D

Below the plasma and above the platelets

Question 20

Reticulocytes are

A

Immature RBC

B

Immature WBC

C

Antibody producing cells

D

Cells help in blood clotting

Question 21

Length of westergrens pipette is

A

100 cm

B

10 cm

C

100 mm

D

300 mm

Question 22

For CBC, blood is collected with anticoagulant

A

No anticoagulant is used

B

Sodium citrate

C

EDTA

D

Double Oxalate

Question 23

Coulter counter is used for

A

ESR determination

B

Prothrombin time

C

CBC

D

Blood smear preparation

Question 24

In case of blood glucose estimation, delay in separation of serum from blood results in

A

High glucose level

B

Low glucose level

C

No change

D

None of the above

Question 25

In Diabetes Mellitus, fruity odour of urine is due to the presence of

A

Glucose

B

Protein

C

Pus cells

D

Acetone

Question 26

Esbach’s reagent is

A

Picric acid and citric acid

B

Acetic acid and picric acid

C

Acetic acid and citric acid

D

None of the above

Question 27

Ketonuria is seen in

A

Diabetes Mellitus

B

Alkalosis

C

Von Gierke’s disease

D

All the above

Question 28

HbA_1C level reveals the mean glucose level over a period of

A

Previous 12-14 weeks

B

Previous 8-10 weeks

C

Previous 2-3 weeks

D

Previous 5-10 days

Question 29

Renal threshold of glucose is

A

120 mg%

B

80 mg%

C

180 mg%

D

140 mg%

Question 30

Multiple myeloma patient shows

A

Haemoglobinuria

B

Alkaptonuria

C

Myoglobinuria

D

Bence – Jones proteinuria

Question 31

Reference value of creatinine clearance in female is

A

120-160 ml/minute

B

80-115 ml/minute

C

75 ml/minute

D

15-40 ml/minute

Question 32

Tumour marker of ovarian cancer is

A

T24

B

CEA

C

CA 19.9

D

CA 125

Question 33

Enzyme that shows marked increase in obstructive liver disease is

A

Alkaline phosphatase

B

Creatine kinase

C

Lactate dehydrogenase

D

Alanine amino transferase

Question 34

Non-enzymatic addition of any sugar to protein is called

A

Glycosylation

B

Glycogenation

C

Glycation

D

Glycolysis

Question 35

Test to the assess excretory function of liver is related to

A

Cardiac Green Test

B

PSP Test

C

SGOT Estimation

D

Serum Bilirubin

Question 36

Dry chemistry system, the reaction is measured by

A

Flow cytometry

B

Emission spectroscopy

C

Reflectance spectrophotometry

D

Nephalometry

Question 37

Leibermann-Burchard reaction is related to

A

Sugar

B

Albumin

C

Creatinine

D

Cholesterol

Question 38

Conn’s syndrome is

A

Hyper aldosteronism

B

Hyper thyroidism

C

Hypo thyroidism

D

Hypo pituitarism

Question 39

Chinese letter pattern is a characteristic feature of

A

Vibrios

B

Corynebacteria

C

Spirilla

D

Streptococci

Question 40

Holding period of hot air oven is

A

120°C for 15 minutes

B

72°C for 15-20 seconds

C

160°C for 1 hour

D

160°C for 15 minutes

Question 41

An example of indicator culture medium is

A

Stuart’s medium

B

McLeod’s medium

C

RCM

D

VR medium

Question 42

Reagent for oxidase reaction of bacteria is

A

P-dimethyl amino benzaldehyde

B

Nessler’s reagent

C

α-naphthol in ethanol

D

Tetra methyl p-phenylene diamine hydrochloride

Question 43

Acid fastness of bacteria is due to the presence of

A

Mycolic acid

B

Flagellin

C

Carboxylic acid

D

Slime layer

Question 44

The parasite of benign tertian malaria is

A

P. ovale

B

P. vivax

C

P. falciparum

D

P. malariae

Question 45

In P. malariae infection, infected RBC shows

A

Jame’s dots

B

Maurer’s dots

C

Ziemann’s dots

D

Schuffner’s dots

Question 46

An example of clearing agent used for tissue processing in histopathology laboratory is

A

Cedar wood oil

B

Ethanol

C

Paraffin wax

D

Isopropyl alcohol

Question 47

Cold acetone is an example of

A

Nuclear fixative

B

Vapour fixative

C

Histochemical fixative

D

Cytoplasmic fixative

Question 48

__________ is used as preservative in Mayer’s haematoxylin stain.

A

Sodium azide

B

Sodium iodate

C

Glycerol

D

Chloral hydrate

Question 49

Stain used for hormonal evaluation in cytology is

A

Cresyl violet

B

Shorr’s stain

C

Acetic orcein

D

H and E stain

Question 50

Routinely used cytological fixative is

A

Carbowax

B

Carnoy’s fixative

C

10% formalin

D

95% ethanol-ether mixture

Question 51

If the percentage error in radius is 1% and the percentage error in length is 3%, what is the percentage error in calculating the volume of a cylinder ?

A

4%

B

2%

C

3%

D

5%

Question 52

A particle moves with velocity 3 m/s towards East for a time t and with a velocity 2 m/s for a time 2t along North. Find the average velocity.

A

4/3 m/s

B

5/3 m/s

C

5/2 m/s

D

5 m/s

Question 53

Find the torque of a force 2î + 2ĵ + 5k̂ about the origin. The force acts on the particle whose position vector is î – ĵ + 2k̂ .

A

-9î – ĵ + 4k̂

B

4î + ĵ - 3k̂

C

9î + ĵ - 4k̂

D

-2î + 4ĵ + 5k̂

Question 54

A body weighs 50 N on the surface of the earth. What is the gravitational force on it due to the earth at a height equal to half the radius of the earth ?

A

25 N

B

50 N

C

10 N

D

0

Question 55

Which of the following is correct for an adiabatic process ?
(i) No heat exchange between system and surrounding.
(ii) No temperature change.
(iii) Slow process.
(iv) Fast process.

A

(i) and (iv)

B

(i) and (iii)

C

(ii) and (iii)

D

(i)

Question 56

At what distance from the mean position, is the kinetic energy in a simple harmonic oscillator equal to potential energy ?

A

a/√2

B

√2 a

C

a/2

D

a

Question 57

What is the force needed to lift a car, if a force of 50 N is applied to the smaller piston of radius 5 cm ? The radius of the larger piston is 15 cm.

A

520 N

B

450 N

C

750 N

D

400 N

Question 58

The resistance of the carbon resistor with colour code red, yellow, red, gold is

A

Range from 2120Ω to 2600Ω

B

Range from 2280Ω to 2520Ω

C

Range from 2283Ω to 2550Ω

D

Range from 2191Ω to 2590Ω

Question 59

The capacitance of a parallel plate capacitor is 10 µF. What happens to the capacitance, if the distance between the plates is reduced by half and the medium between the plates is filled with a medium of dielectric constant, 6 ?

A

20 µF

B

60 µF

C

120 µF

D

10 µF

Question 60

The uses of microwaves are

A

used in radar systems

B

used in electrical heaters

C

used in medical imaging

D

used in fibre optic communication

Question 61

Find the value of the shunt resistance, if a galvanometer is converted to ammeter. The galvanometer resistance is 10Ω and it requires 5% of the main current as the current for full-scale deflection.

A

10/19 Ω

B

10/11 Ω

C

10/20 Ω

D

10/13 Ω

Question 62

The value of Bohr radius is

A

6.29 × 10–¹¹ m

B

5.29 × 10–¹¹ m

C

5.29 × 10–¹⁰ m

D

6.12 × 10–¹¹ m

Question 63

The half-life period of a radioactive substance is 30 days. What is the time for 3/4^th of the original mass to disintegrate ?

A

90 days

B

60 days

C

45 days

D

50 days

Question 64

Two lenses of powers +6D and –2D are combined. The focal length of the combination is

A

.12 m

B

.25 m

C

.15 m

D

.5 m

Question 65

If the input frequency is 50 Hz, what is the output frequency in a full-wave rectifier ?

A

50 Hz

B

75 Hz

C

100 Hz

D

25 Hz

Question 66

Which of the following contains the greatest number of molecules ?

A

1g O₂

B

1g H₂O

C

1g H₂

D

1g NH₃

Question 67

The total number of orbitals in an energy level designated by principal quantum number n is equal to

A

n – 1

B

n²

C

2n²

D

2n

Question 68

Which of the following has lowest pH ?

A

1M HCl

B

0.1M HCl

C

0.01M HCl

D

0.001M HCl

Question 69

Which of the following is a secondary cell ?

A

Dry cell

B

Nickel-Cadmium cell

C

Mercury cell

D

None of these

Question 70

Smoke is an example of

A

Foam

B

Sol

C

Gel

D

Aerosol

Question 71

Which among the following element has largest atomic radius ?

A

Na

B

Mg

C

K

D

Al

Question 72

An antiseptic sold in the market as perhydrol

A

SO₂

B

Dettol

C

Phenol

D

Hydrogen peroxide

Question 73

Which ion is required for the coagulation of blood ?

A

Copper

B

Calcium

C

Magnesium

D

Zinc

Question 74

Name the gas formed when concentrated Nitric acid is added to copper.

A

NO₂

B

N₂O

C

H₂

D

N₂

Question 75

Which of the following alloys contain Copper, Tin and Zinc ?

A

Brass

B

Bronze

C

Gun metal

D

German silver

Question 76

A

4-Oxopentanoic acid

B

1, 4-Dioxopentanol

C

1-Hydroxypentane 1, 4-dione

D

1-Hydroxypentane 1, 5-dione

Question 77

Which of the following gives silver mirror with Tollen’s reagent ?

A

CH₃ – CH₂ – OH

B

CH₃ – CHO

C

CH₃ – CH₂ – CO – CH₂ – CH₃

D

CH₃ – COOH

Question 78

Which of the following vitamin deficiency causes convulsion ?

A

Vitamin B₁

B

Vitamin B₂

C

Vitamin B₆

D

Vitamin B₁₂

Question 79

Arsenic containing medicine used for the treatment of syphilis is

A

Streptomycin

B

Novalgin

C

Chloroquine

D

Salvarsan

Question 80

Terylene is a condensation polymer of ethylene glycol and

A

Phthalic acid

B

Terephthalic acid

C

Adipic acid

D

Benzoic acid

Question 81

From the following plants, which one is a Dioecious plant ?

A

Coconut

B

Cucurbita

C

Date Palm

D

Hibiscus

Question 82

Seeds of certain flowering plants contain perisperm. What is perisperm ?

A

Persistent Endosperm

B

Persistent Nucellus

C

Cotyledon

D

Unused Endosperm

Question 83

Ability of a plant cell to generate as a whole plant is known as

A

Totipotency

B

Pleuripotency

C

Biopotency

D

Innate Potency

Question 84

From the following find out a selectable marker.

A

Eco R₁

B

ori

C

rop

D

amp

Question 85

The process of Elution during electrophoresis is

A

Loading DNA

B

Restriction digestion

C

Staining

D

Separated DNA fragments are cut out from agarose gel and extracted from gel piece

Question 86

A single stranded DNA or RNA which is tagged with a radioactive molecule used in molecular diagnosis is known as

A

Probe

B

Primer

C

cDNA

D

RNAi

Question 87

Name the Ecological Interaction between orchid and mango tree.

A

Amensalism

B

Mutualism

C

Commensalism

D

Parasitism

Question 88

Name the ecological pyramid which is always upright.

A

Number pyramid

B

Biomass pyramid

C

Both A) and B)

D

Energy pyramid

Question 89

Function of the nucleolus is

A

Controlling cell activities

B

Biosynthesis of ribosome subunits

C

Motility of cell

D

Formation of basal bodies

Question 90

Terminalisation of Chiasmata occur at which stage of Prophase I ?

A

Diplotene

B

Diakinesis

C

Leptotene

D

Zygotene

Question 91

The transmission of HIV infection in human being generally not occurs

A

By sharing infected injection needles

B

From infected mother to her child

C

By drinking water using the same glass

D

By sexual contact with infected person

Question 92

Pseudocoelom is found only in animals belonging to the phylum

A

Cnidaria

B

Aschelminthes

C

Mollusca

D

Echinodermata

Question 93

Which factor is not favourable for the formation of oxyhaemoglobin in human being ?

A

high PO₂

B

low PCO₂

C

high temperature

D

low H ion concentration

Question 94

Name the cells which synthesize and secrete testacular hormones called androgens.

A

Leydig cells

B

Sertoli cells

C

Male germ cells

D

Spermatids

Question 95

‘Carbohydrates are not digested in the stomach of human being.’ The reason for this is
(i) Pepsin can digest only small amount of carbohydrates.
(ii) There are no carbohydrates in gastric juice.
(iii) Salivary amylase becomes denatured by the HCl in stomach.

A

statement (i) is correct

B

all statements are correct

C

all statements are wrong

D

statements (ii) and (iii) are correct

Question 96

The QRS complex in an ECG of a man represents

A

Ventricular depolarisation

B

Atrial depolarisation

C

Ventricular repolarisation

D

Arial repolarisation

Question 97

Name the chromosomal disorder in which the affected individual expresses Gynaecomastia.

A

Down’s Syndrome

B

Klinefelter’s Syndrome

C

Turner’s Syndrome

D

Acquired Immuno Deficiency Syndrome

Question 98

In a transcription unit of DNA, the strand which acts as a template for RNA synthesis is known as

A

Coding strand

B

Intron

C

Exon

D

Template strand

Question 99

An increase blood flow to atria of human heart stimulates the release of Atrial Natriuretic Factor (ANF) will leads to
(i) Vaso dialation
(ii) Increase GFR
(iii) Increase urine formation
(iv) Decrease blood pressure.

A

Statement (ii) is correct

B

Statements (ii) and (iii) are correct

C

Statement (i) is correct

D

Statements (i) and (iv) are correct

Question 100

One of the following organism is not included in the phylum Mollusca.

A

Chaetopleura

B

Aplysia

C

Ophiura

D

Loligo