DFCCIL'21 CE: Daily Practice Quiz. 14-September-2021 |_00.1
Engineering Jobs   »   Civil Engineering quizs   »   DFCCIL QUIZ

DFCCIL’21 CE: Daily Practice Quiz. 14-September-2021

DFCCIL (Dedicated Freight Corridor Corporation of India Limited) Exam Date 2021 on September and October 2021 so boost your preparation by attempt this Civil Environmental Engineering quiz for DFCCIL recruitment 2021.

Quiz: Civil Engineering
Exam: DFCCIL-JE
Topic: Environmental Engineering

Each question carries 1 mark
Negative marking: 1/4 mark
Time: 8 Minutes

Q1. The plume behavior which occurs in the super adiabatic condition with light to moderate wind speed in the presence of large scale thermal eddies are known as………..
(a) coning plume
(b) neutral plume
(c) looping plume
(d) fanning plume

Q2. What is the threshold of audibility in decibel?
(a) 20
(b) 40
(c) 66
(d) 92

Q3. The volume (in milliliters) occupied by aerated mixed liquor containing one gram of dry solids after setting for 30 minutes is termed as:
(a) Allowable solids content
(b) Sludge volume index
(c) Liquor index
(d) Chlorination limit

Q4. A grit chamber of dimensions 12.0 m × 1.50 m × 0.80 m liquid depth has flow of 720 m³/hr. Its surface loading rate and detention time are respectively
(a) 4000 m³/hr and 1.2 minute
(b) 40000 Lph/m² and 40 minute
(c) 40 m³/hr/m² and 12 minute
(d) 40000 Lph/m² and 1.2 minute

Q5. The presence of which of the following is a reason for temporary hardness of water?
(a) Chlorides
(b) Carbonates
(c) Nitrates
(d) Sulphates

Q6. Consumption of higher concentration of fluorides exceeding 1.5 mg/L may cause:
(a) Arsenicosis
(b) Argyria
(c) Blue baby disease
(d) Fluorosis

 

SOLUTION
S1. Ans.(c)
Sol. Looping plume occurs in super adiabatic condition in which Environmental lapse rate is greater than adiabatic lapse rate.

S2. Ans.(a)
Sol.

Infrasonic

Audible

Ultrasonic

Less than 20 Hz

20 HZ to 20,000 Hz

> 20,000 Hz

S3. Ans.(b)
Sol. Sludge volume index → Sludge volume index is defined as volume occupied in ml. by 1 gm. Of solid in the mix liquor when allow to settle for 30 min.
▭(SVI=(Settled Sludge volume (ml))/(MLSS (gm) ))

S4. Ans.(d)
Sol. Given,
Dimension of grit chamber = 12 ×1.5 × 0.8 m³
Rate of flow = 720 m²/hr
Surface loading rate =?
Detention time =?

Surface loading rate = (Discharge\/rate of flow)/(Surface area.)
= 720/(12×1.5)
= 40 m³/hr/m²
= 40000 l/hr/m²
Detention time = (Volume of tank)/(rate of flow)
= (12 ×1.5 ×0.8 ×60)/720 = 1.2 min.

S5. Ans.(b)
Sol. Hardness of water is due to the presence of multivalent cation.
Major ion → Ca^(+2),Mg^(+2)
Minor ion → Al^(+3),Sr^(+2),Mn^(+2),Fe^(+2)

DFCCIL'21 CE: Daily Practice Quiz. 14-September-2021 |_40.1

S6. Ans.(d)
Sol. It concentration of fluorides in drinking water exceeding 1.5 mg/l, then it may cause fluorosis, decolorization and molting of teeth. It the concentration of fluorides is less than 1 mg/l then it may cause dental cavity.

Sharing is caring!

×

Download success!

Thanks for downloading the guide. For similar guides, free study material, quizzes, videos and job alerts you can download the Adda247 app from play store.

Thank You, Your details have been submitted we will get back to you.

Was this page helpful?

Leave a comment

Your email address will not be published. Required fields are marked *

Join India's largest learning destination

What You Will get ?

  • Job Alerts
  • Daily Quizzes
  • Subject-Wise Quizzes
  • Current Affairs
  • Previous year question papers
  • Doubt Solving session

Login

OR

Forgot Password?

Join India's largest learning destination

What You Will get ?

  • Job Alerts
  • Daily Quizzes
  • Subject-Wise Quizzes
  • Current Affairs
  • Previous year question papers
  • Doubt Solving session

Sign Up

OR
Join India's largest learning destination

What You Will get ?

  • Job Alerts
  • Daily Quizzes
  • Subject-Wise Quizzes
  • Current Affairs
  • Previous year question papers
  • Doubt Solving session

Forgot Password

Enter the email address associated with your account, and we'll email you an OTP to verify it's you.


Join India's largest learning destination

What You Will get ?

  • Job Alerts
  • Daily Quizzes
  • Subject-Wise Quizzes
  • Current Affairs
  • Previous year question papers
  • Doubt Solving session

Enter OTP

Please enter the OTP sent to
/6


Did not recive OTP?

Resend in 60s

Join India's largest learning destination

What You Will get ?

  • Job Alerts
  • Daily Quizzes
  • Subject-Wise Quizzes
  • Current Affairs
  • Previous year question papers
  • Doubt Solving session

Change Password



Join India's largest learning destination

What You Will get ?

  • Job Alerts
  • Daily Quizzes
  • Subject-Wise Quizzes
  • Current Affairs
  • Previous year question papers
  • Doubt Solving session

Almost there

Please enter your phone no. to proceed
+91

Join India's largest learning destination

What You Will get ?

  • Job Alerts
  • Daily Quizzes
  • Subject-Wise Quizzes
  • Current Affairs
  • Previous year question papers
  • Doubt Solving session

Enter OTP

Please enter the OTP sent to Edit Number


Did not recive OTP?

Resend 60

By skipping this step you will not recieve any free content avalaible on adda247, also you will miss onto notification and job alerts

Are you sure you want to skip this step?

By skipping this step you will not recieve any free content avalaible on adda247, also you will miss onto notification and job alerts

Are you sure you want to skip this step?