EASY PSC | 021/2023 - Junior Instructor (Plumber) Anmswer Key Cutoff

Question 1

Which fire extinguisher is used to extinguish class ‘B’ fire ?

A

Halen extinguisher

B

Carbon-dioxide extinguisher

C

Dry powder extinguisher

D

Foam extinguisher

Question 2

What is the period referred as “Golden Hoarse” ?

A

First 30 minutes after incident

B

First 30 minutes after first aid

C

First 45 minutes of admission

D

First 60 minutes after treatment

Question 3

What is the colour code for plastic waste bin ?

A

Yellow

B

Blue

C

Green

D

Red

Question 4

What is the immediate action to be taken in the event of fire ?

A

Inform floor in charge

B

Close doors and windows

C

Raise an alarm

D

Call medical assistance

Question 5

Which bolt is used to convert rotational speed into longitudinal speed ?

A

Shackle bolt

B

Cotter bolt

C

Levis bolt

D

Eye bolt

Question 6

What is the length of pipe projection required from the vice while threading GI pipes ?

A

100 – 125 mm

B

150 – 250 mm

C

150 – 200 mm

D

125 – 150 mm

Question 7

What are the weld positions for pipes by gas welding ?

A

1G, 2G, 3G and 4G

B

1G, 2G, 4G and 6G

C

1G, 2G, 5G and 6G

D

None of these

Question 8

Which type of filler metal does not require flux while gas welding ?

A

High Silicone Cast Iron

B

Mild Steel-Type S-FSI

C

Copper Filler Rod

D

Medium Nickel Bronze

Question 9

The Brass and Bronze are welded by _______ flame.

A

Carburising

B

Neutral

C

Oxidizing

D

Normal

Question 10

The cone shaped holes that appear on the surface of plaster is known as

A

Flaking

B

Crazing

C

Popping

D

Bending

Question 11

Which bond of bricks are laid cross wise with 5 cm lap each coarse ?

A

Stretcher bond

B

Header bond

C

Raking bond

D

Dutch bond

Question 12

Which type of bricks are used in construction such as bridges, storage building, etc. ?

A

Heavy duty bricks

B

Perforated bricks

C

Solid bricks

D

Fire bricks

Question 13

The following type of GLOVES are used to protect against burns

A

Asbestos

B

Rubber

C

Plastic

D

Cloth

Question 14

How to stop bleeding of injured person ?

A

Tie bandage

B

Apply ointment

C

Apply pressure over the wound

D

Apply tincture over the wound

Question 15

What type of saw is used to cut a pipe ?

A

Coarse pitch saw

B

Medium pitch saw

C

Fine pitch saw

D

Very fine pitch saw

Question 16

Which type of filler rod contains copper, aluminium, tin along with zinc ?

A

Ferrous filler rod

B

Alloy type filler rod for ferrous metals

C

Non-ferrous filler rod

D

Alloy type filler rod for non-ferrous metals

Question 17

The chemical formula for acetylene gas is

A

CH₄

B

C₂H₂

C

CH₂

D

C₄H₄

Question 18

What type of solder is used for soldering in heavy [thick] metal ?

A

Soft solder

B

Coarse solder

C

Hard solder

D

Fine solder

Question 19

Which maximum diameter pipes can be bend using radius collar bending machine ?

A

15 mm dia

B

20 mm dia

C

25 mm dia

D

30 mm dia

Question 20

What size of nozzle number is used to weld 5 mm thick plate ?

A

Nozzle size No. 7

B

Nozzle size No. 18

C

Nozzle size No. 13

D

Nozzle size No. 10

Question 21

Chemically, lime is mainly

A

Calcium Carbonate

B

Calcium Oxide

C

Magnesium Oxide

D

Magnesium Nitrate

Question 22

Which of the following is known as independent scaffolding ?

A

Cantilever scaffolding

B

Double scaffolding

C

Suspended scaffolding

D

Steel scaffolding

Question 23

What is the minimum compressive strength of first class bricks ?

A

120 kg/cm²

B

105 kg/cm²

C

110 kg/cm²

D

115 kg/cm²

Question 24

What is the percentage of strength for the cement in storage after 3 months ?

A

48% strength

B

85% strength

C

75% strength

D

60% strength

Question 25

The angle of squint junction is generally

A

45°

B

90°

C

120°

D

18°

Question 26

The hollowness of concrete block is ________ of the volume of the concrete.

A

10 – 20%

B

20 – 40%

C

40 – 80%

D

80 – 100%

Question 27

What is the percentage by weight of crushed gravel sand through IS sieve No. 120 ?

A

0 – 10%

B

5 – 30%

C

25 – 60%

D

45 – 85%

Question 28

The usual length of pipes varies between

A

1 meter to 5 meter

B

15 meter to 30 meter

C

2 meter to 6 meter

D

10 meter to 22 meter

Question 29

The pipes joined by expansion joint are made of

A

Copper

B

Cast Iron

C

Glass

D

Plastic

Question 30

The other name for bell mouth end is

A

Clamp End

B

Golden End

C

Socket End

D

Spigot End

Question 31

What is the temperature range of heating tools used in plastic welding process ?

A

50°C to 100°C

B

400°C to 470°C

C

200°C to 370°C

D

600°C to 670°C

Question 32

Which is the process of water softening treatment works based on ion-exchangeprocess ?

A

Zeolite process

B

Reverse osmosis process

C

Lime soda process

D

De-mineralization process

Question 33

Which material is used to make ferrules in dual system of treated water supply ?

A

Lead

B

Brass

C

Steel

D

Bronze

Question 34

Nephelometer is used for determining

A

Temperature

B

Turbidity

C

Colour

D

Acidity

Question 35

Tri-calcium phosphate and carbon is used for removing

A

Calcium

B

Magnesium

C

Fluoride

D

Carbon

Question 36

The value of B-coli index for drinking water should not be more than

A

10

B

20

C

40

D

30

Question 37

Which plaster thickness of not more than 25 mm finished surface resemble very much as marble finish ?

A

Lime mortar plaster

B

Rough coat plaster

C

Stucco plaster

D

Pebble dash plaster

Question 38

Which is the grade of ordinary portland cement conforming IS 12269 ?

A

53 grade

B

43 grade

C

33 grade

D

63 grade

Question 39

Which one is artificial sand ?

A

Sea sand

B

Crushing stone sand

C

River sand

D

Pit sand

Question 40

The vertical sides of finished opening on both sides of doors, windows are known as

A

intel

B

sill

C

jambs

D

corbel

Question 41

For what thickness of partition walls is the stretcher bond used ?

A

5 cms

B

10 cms

C

15 cms

D

20 cms

Question 42

What is the ratio of bed concrete used for an Indian type water closet ?

A

1 : 2 : 4

B

1 : 3 : 6

C

1 : 4 : 8

D

1 : 5 : 10

Question 43

What is the desirable temperature of potable water ?

A

5°C

B

10°C

C

8°C

D

6°C

Question 44

Which is the process of water preparation for the industrial purpose ?

A

De-mineralisation process

B

Zeolite process

C

Lime soda process

D

Reverse osmosis process

Question 45

Asbestos pipe was first introduced in _________ year.

A

1940

B

1970

C

1920

D

1980

Question 46

Which type of joint is suitable for joining large size PVC pipes with VALVES ?

A

Flare joint

B

Flanged joint

C

Brazed joint

D

Compression joint

Question 47

Sewer pipe line and underground pipe line are made of

A

Steel

B

Plastic

C

Glass

D

Cast Iron

Question 48

The quantity of chloride in case of drinking water should not be more than

A

100 ppm

B

350 ppm

C

250 ppm

D

400 ppm

Question 49

Which water supply distribution system is suitable for towns growing irregularly ?

A

Radial system

B

Tree or dead end system

C

Circle or Ring system

D

Grid iron system

Question 50

What is the size of concrete weep holes constructed in the infiltration galleries ?

A

Size 3 × 10 cm

B

Size 7 × 10 cm

C

Size 5 × 10 cm

D

Size 10 × 10 cm

Question 51

Which of following is a form of heat ?

A

Energy

B

Force

C

Hardness

D

Power

Question 52

According to which of the following principles does heat transmission occur ?

A

Thermodynamics

B

Gravity

C

Inertia

D

Velocity

Question 53

The increase in temperature of any element caused by energy is called

A

Degree

B

Power

C

Heat

D

Calorie

Question 54

The intensity of any element of getting hot or cold is defined by

A

Density

B

Temperature

C

Stress

D

Physical changes

Question 55

Heat transmission refers to

A

Exchange of heat energy

B

Stability in temperature

C

Absorption of energy

D

All of these

Question 56

What is the conversion of sunlight into renewable energy for water heating using a solar thermal collector ?

A

Water heater

B

Solar water heater

C

Direct heating

D

Indirect heating

Question 57

With reference to solar heat, what does Etc mean ?

A

Evacuated tube collector

B

Extra tube collector

C

Elevated tube collector

D

None of these

Question 58

Which type of tap is used for hot and cold water pipe line in a system ?

A

Stop cock

B

2 or 3 in mixer tap

C

One I one mixer

D

Plung tap

Question 59

Following is type of solar heater

A

Direct gain type

B

Closed loop type

C

Panel

D

Cell

Question 60

The solar system which use flat paned collector is

A

Closed loop system

B

Direct gain type

C

Both (A) and (B)

D

None of these

Question 61

The piping system which same pipe is used for the discharge of waste matter and dirty water is known as

A

One pipe system

B

Partial ventilated system

C

Single stack system

D

None of these

Question 62

The piping system in which different systems are used for the discharge of waste matter and dirty water is known as

A

Single pipe system

B

Stack system

C

Two pipe system

D

All of these

Question 63

The number of main pipes in two pipe system is

A

2

B

3

C

4

D

5

Question 64

For which of the following system, a separate pipe for ventilation is provided ?

A

Single stuck system

B

Partial ventilated system

C

One pipe system

D

All of these

Question 65

The main test for inspection of drainage system

A

Smoke test

B

Air pressure test

C

Ball test

D

All of these

Question 66

Other name of floor trap is

A

Gully trap

B

Nahani trap

C

Bottle trap

D

Intercepting trap

Question 67

Traps are used to prevent the passage of

A

Air

B

Oxygen

C

Sewer gas

D

Wash water

Question 68

In which type of hydrant installed at underground ?

A

Post

B

Past

C

Flush

D

Surplus

Question 69

The hydrant which is installed in an underground brick is known as

A

Plush hydrants

B

Flush hydrants

C

Post hydrants

D

Surplus hydrants

Question 70

The minimum size of a fire hydrants is

A

5 cm

B

10 cm

C

15 cm

D

20 cm

Question 71

The shock and sound produced on suddenly stopping the following water by closing the valve is known as

A

Water hammer

B

Water shot

C

Burst sound

D

Water point

Question 72

The resolution of the water hammer problem is

A

Closure of valve slowly

B

Usage of air chamber

C

Closure of faucet slowly

D

All of these

Question 73

The scientific method meant for testing the pressure and leakage in a pipe at same time is known as

A

Hydrostatic test

B

Rock well test

C

Sounding road test

D

Hardness test

Question 74

Which test is applied in underground drains for soundness ?

A

Water test

B

Sound test

C

Hydraulic test

D

Pneumatic test

Question 75

In distribution pipes, drain valves are provided at

A

Junctions

B

Summits

C

Lower points

D

Any where

Question 76

Most common surface water supply is

A

Sea

B

Pond

C

River

D

Lake

Question 77

The distribution of water by gravity is

A

Not reliable

B

Very difficult to maintain

C

Is easy if at height

D

Costly

Question 78

Air relief valves in water supply pipelines are provided at

A

Pipe bends

B

Pipe joints

C

Summits

D

Low points

Question 79

High points air relief valves are provided to remove

A

Accumulated air

B

Suspended matter

C

Internal temperature

D

Branching of connecting

Question 80

What is the use of water meter ?

A

To determine the unit of flow pressure

B

To determine the quality of water

C

To determine the quantity of water

D

To determine the quality of flow pressure

Question 81

The pipe that drain out waste water from building and house are known as

A

Drain pipe

B

Water pipe

C

Carbon pipe

D

Vent pipe

Question 82

Drainage pipe should be

A

Air tight

B

Leak proof

C

Such that it makes water flow at a greater speed

D

All of these

Question 83

Cess pools are provided

A

Inside the building

B

Away from building

C

In bathroom

D

In carriage

Question 84

The following is not a part of drainage system

A

Hopper

B

Gully

C

Grating

D

Junction

Question 85

The layout of domestic drainage system depends upon

A

The design of the building

B

Number of fixtures

C

Type of pipes

D

All of these

Question 86

The tanks means for collecting human waste are known as

A

Water tanks

B

Inspection tanks

C

Septic tanks

D

Floor tanks

Question 87

Inspection chamber is constructed in the drainage system for

A

Inspection

B

Maintenance

C

Removing blockage

D

All of these

Question 88

Seepage pit it also called

A

Air chamber

B

Septic tank

C

Soak pit

D

Sump

Question 89

Man holes on sewer lines are provided for

A

Periodic cleaning

B

Oxidation purpose

C

Removal of some sewage

D

At bends

Question 90

For house drainage minimum gradient is

A

1 in 10

B

1 in 30

C

1 in 60

D

1 in 80

Question 91

The shaft connecting pump and electric motors is called

A

Connecting shaft

B

Joint shaft

C

Propeller shaft

D

Transmission shaft

Question 92

The pumps that work by remaining completely or partially immersed in water are called

A

Booster pump

B

Submersible pump

C

Impulse pump

D

Centrifugal pump

Question 93

The function of booster pump is

A

To increase the water pressure

B

To decrease the speed of water

C

To maintain the temperature of water

D

All of these

Question 94

The following is a type of centrifugal pump

A

Turbine pump

B

Rotary pump

C

High lift pump

D

Centrifugal pump

Question 95

Air lift pump is installed to draw more water from the deep well the pump is operated by

A

Acute air

B

Secondary electrical

C

Compressed air

D

Primary electric source

Question 96

Which of the following containments has the characteristics of causing server public health risk through transmission of communicable water born diseases ?

A

Pathogenic microorganism

B

Settleable solids

C

Micropollutants

D

Total dissolved solid

Question 97

Water can take a from of an invisible gas called

A

Carbon Dioxide

B

Oxygen

C

Hydrogen

D

Water vapour

Question 98

Flux in the soldering is used

A

To heat the joint

B

To heat the solder

C

To avoid oxidation

D

None of these

Question 99

Which type of brazing is suitable for joining copper and bronze metal tubes ?

A

Dip brazing

B

Silver brazing

C

Furnace brazing

D

Inducation brazing

Question 100

Which water supply distributions system is suitable for towns growing irregularly ?

A

Radial system

B

Tree or dead and system

C

Circle or ring system

D

Grid iron system