Job Solution - টেকনিক্যাল - Page 5 - Prothom Sir

1.

The population of a city in the first three continuous years is given as 6000,8000 and 10000 respectively. What is the population of the city in the fourth continuous year, according to the geometric increase method?

11500

12000

12870

14000

11500

12000

12870

14000

2.

If the average daily consumption of a city is 100,000 m3, the maximum daily consumption on peak hourly demand will be

100000m3

150000m3

180000m3

270000 m3

100000m3

150000m3

180000m3

270000 m3

3.

The devices which are installed for drawing water from the sources are called

aquifers

aquiclude

filters

intakes

aquifers

aquiclude

filters

intakes

4.

The polluted water is one which

contains pathogenic bacteria

Consists of undesirable substances making it unfit for its best use i.e. drinking

is safe and suitable for drinking and domestic use

is contaminated

contains pathogenic bacteria

Consists of undesirable substances making it unfit for its best use i.e. drinking

is safe and suitable for drinking and domestic use

is contaminated

5.

Alum as a coagulant is found to be most effective when pH range of water is

2 to 4

4 to 6

6 to 8

8 to 10

2 to 4

4 to 6

6 to 8

8 to 10

6.

The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by

TOD > BOD > COD

TOD > COD > BOD

BOD > COD > TOD

COD > BOD > TOD

TOD > BOD > COD

TOD > COD > BOD

BOD > COD > TOD

COD > BOD > TOD

7.

The increase of temperature results in

increase in viscosity of gas

increase in viscosity of liquid

decrease in viscosity of gas

decrease in viscosity of liquid

increase in viscosity of gas

increase in viscosity of liquid

decrease in viscosity of gas

decrease in viscosity of liquid

8.

Kinematic viscosity is dependent upon

Pressure

distance

flow

density

Pressure

distance

flow

density

9.

The weight of a body is due to

gravitational pull exerted by the earth

forces experienced by body in atmosphere

force of attraction experienced by particles

gravitational force of attraction towards the center of the earth.

gravitational pull exerted by the earth

forces experienced by body in atmosphere

force of attraction experienced by particles

gravitational force of attraction towards the center of the earth.

10.

In a circuit a 33 Q resistor carries a current of 2 A.. The voltage across the resistor is

33 V

66 V

80 V

132 V

33 V

66 V

80 V

132 V

11.

The metallic structure of mild steel is

body centred cubic

face centred cubic

hexagonal close packed

cubic structure

body centred cubic

face centred cubic

hexagonal close packed

cubic structure

12.

Pure iron is the structure of

ferrite

pearlite

anstenite

ferrite and cementite

ferrite

pearlite

anstenite

ferrite and cementite

13.

Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be

9 times

1/9 times

1/3 times

3 times

9 times

1/9 times

1/3 times

3 times

14.

Metacentric height is given as the distance between

the center of gravity of the body and the meta center

the center of gravity of the body and the center of buoyancy

the center of gravity of the body and the center of pressure

center of buoyancy and metacenter.

the center of gravity of the body and the meta center

the center of gravity of the body and the center of buoyancy

the center of gravity of the body and the center of pressure

center of buoyancy and metacenter.

15.

Surface energy per unit area of a surface is numerically equal to

atmospheric pressure

Surface tension

force of adhesion

force of cohesion

atmospheric pressure

Surface tension

force of adhesion

force of cohesion

16.

Dissolved oxygen in streams is

maximum at noon

minimum at noon

maximum at midnight

same throughout the day

maximum at noon

minimum at noon

maximum at midnight

same throughout the day

17.

Sewerage system is designed for

maximum flow only

minimum flow only

average flow only

maximum and minimum flow

maximum flow only

minimum flow only

average flow only

maximum and minimum flow

18.

Aeration of water is done to remove

odour

colour

bacterias

hardness

odour

colour

bacterias

hardness

19.

Sunlight

helps growth of bacterias

impedes growth of algae

increases dissolved oxygen content

reduces turbidity.

helps growth of bacterias

impedes growth of algae

increases dissolved oxygen content

reduces turbidity.

20.

By boiling water, hardness can be removed if it is due to

calcium sulphate

magnesium sulphate

calcium nitrate

calcium bicarbonate

calcium sulphate

magnesium sulphate

calcium nitrate

calcium bicarbonate