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GATE2020 Environmental Engineering Rapid Mini Mock (App update required to attempt this test)

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Question 1

Indore and Bangalore process of composting are which of the following?

Question 2

A city was having a population of 3,25,000 in the year 1971 and 4,75,000 in 2011. According to geometric increase method, the growth rate per decade is _________%.

Question 3

The sound pressure level for a jet plane on the ground with sound pressure of 2500 μ bar should be ____dB.

Question 4

A surface water treatment plant operates round the clock with a discharge of 45 m3/min. The water temperature is 15℃ and jar testing indicates an alum dosage of 30 mg/l with flocculation at a ‘Gt’ value of 3.5 x 104 producing optimal results, where ‘G’ is velocity gradient. The alum quantity required for one year of operation of the plant is ________ tones.

Question 5

Consider the following statements regarding the water distribution network system and choose the correct statement(s)
i. Radial system is designed for towns with haphazard and irregular expansion.
ii. Tree system, also known as grid – iron system is used eliminate the dead ends completely.
iii. To ensure high pressure and efficient design of pipe system, radial network is ideal.
iv. Equal pressure and multiple flow path can be achieved by designing circular network system.

Question 6

A raw water sample has following composition-

Alkalinity as CaCO3 = 140 mg/L

Magnesium as Mg = 13.6 mg/L

Non-carbonate hardness as CaCO3 = 25 mg/L

Carbon-dioxide as CO2 = 22 mg/L

The amount of lime needed to soften the raw water is

Question 7

Analysis of a water sample revealed that the sample contains the following species.

Concentrations of which of the species will be required to compute alkalinity?

Question 8

As per Mr. Goodrich formula, what is the ratio of the daily peak demand fo water and the monthly peak demand computed for a period of 12 days.

Question 9

A landfill is to be designed to serve a population of 200000 for a period of 25 years. The solid waste (SW) generation is 2 kg/person/day. The density of the un-compacted SW is 100 kg/m3 and a compaction ratio of 4 is suggested. The ratio of compacted fill (i.e. SW + cover) to compacted SW is 1.5. The landfill volume (in million m3) required is _______.

Question 10

The wastewater having an organic concentration of 54 mg/l is flowing at a steady rate of  0.8m3 /day through a detention tank of dimensions If the contents of the tank are well mixed and the decay constant is 0.1 per day, the outlet concentration (in mg/l, up to
one decimal place) is ______

Question 11

A rectangular tank 18 m x 8 m x 4m of water depth treats 4 million litres of water per day. The detention time for tank will be ____hours.

Question 12

For a given water sample, the ratio between and the ultimate BOD is 0.68. The value of the reaction rate constant k (on base e) ( in day-1 up to two decimal places) is_____
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Jun 26ESE & GATE CE