Previous year MCQs

General science UPPSC 2023 GS-I
Question

Biological Oxygen Demand(BOD) is a standard criteria for -

Answer & Solution

Answer: (Detailed Solution Below)

Option A: Pollution assay in aquatic ecosystems

Detailed Solution:

The correct answer is “Pollution assay in aquatic ecosystems”.
Biological Oxygen Demand (BOD) is a measure of the amount of oxygen that microorganisms will consume while decomposing organic matter in water. It is an important indicator of the organic pollution level in aquatic ecosystems, helping to assess water quality and the impact of waste on these environments.

Similar Questions:

The essential element in all organic compounds is:
  1. A) Nitrogen
  2. B) Oxygen
  3. C) Carbon
  4. D) Sulphur
Pressure inside a soap bubble is:
  1. A) More than atmospheric pressure
  2. B) Less than atmospheric pressure
  3. C) Equal to atmospheric pressure
  4. D) Half of atmospheric pressure
Which of the following is not a molecule atomic particle?
  1. A) Neutron
  2. B) Proton
  3. C) Deuteron
  4. D) Electron
Which one of the following hormones stimulates pancreas for the production of digestive juice?
  1. A) Rennin
  2. B) Trypsin
  3. C) Secretin
  4. D) Pepsin
The plants receive nitrogen in form of
  1. A) Nitric oxide
  2. B) Nitrate
  3. C) Ammonia
  4. D) Nitride
Match list I with list II and select the correct answer from the code given below:
List-I (Acid) - List-II (Source)

A. Lactic acid - 1. Lemon
B. Acetic acid - 2. Rancid butter
C. Citric acid - 3. Milk
D. Butyric acid - 4. Vinegar

Code:
A B C D
  1. A) 1 4 3 4
  2. B) 3 4 1 2
  3. C) 2 3 4 2
  4. D) 3 2 3 1
SONAR is mostly used by:
  1. A) Astronauts
  2. B) Doctors
  3. C) Engineers
  4. D) Navigators
Smaller forms of computers are possible because of use of which substance?
  1. A) Transistor
  2. B) Integrated circuit chips
  3. C) Nano material
  4. D) Super Conductor
Cholestrol is
  1. A) an insecticide
  2. B) a vitamin
  3. C) a steroid
  4. D) an enzyme
Desert plants have longer root system because:
  1. A) High temperature of the soil encourages root growth
  2. B) Root grow in search of water
  3. C) Soil does not contain water, hence becomes compact and presses the roots to grow longer
  4. D) Roots move opposite to the solar heat
Site of gaseous exchange in lungs is:
  1. A) Tracheoles
  2. B) Bronchioles
  3. C) Pulmonary vein
  4. D) Alveoli
Which of the following is not a greenhouse gas?
  1. A) Carbon dioxide
  2. B) Methane
  3. C) Oxygen
  4. D) Water vapor