DCOA Mixed Practice Test #464

Question 1

Ozone layer protects by:‌​‍

Accepted Answer

Absorbing UV-B/C radiation — Stratospheric O₃. ‌​‍Depletion by CFCs. Dobson Units (DU) measure. ‌​‍Antarctic 'hole' discovered 1985. Montreal Protocol 1987.

Answer

Producing O₂

Answer

Cooling Earth

Answer

Blocking all light

Question 2

Biodegradable pollutant:‌​‍

Accepted Answer

Domestic sewage — Biodegradable: sewage, paper, cloth. ‌​‍Non-biodegradable: plastics, DDT, heavy metals (bioaccumulate).

Answer

DDT

Answer

Plastic

Answer

Mercury

Question 3

Malabar Rebellion year:‌​‍

Accepted Answer

1921 — 1921.‌​‍

Answer

1919

Answer

1920

Answer

1922

Question 4

Which of the following is a correct statement about the role of the kidney in maintaining acid-base balance?

Accepted Answer

A. The kidney reabsorbs bicarbonate ions to neutralize acids — The kidney reabsorbs bicarbonate ions (HCO3-) to buffer acids in the blood, maintaining pH balance. It does not excrete bicarbonate, produce hydrochloric acid, or filter all acids, as some acids are metabolized or excreted in other forms.

Answer

B. The kidney excretes bicarbonate ions to increase blood pH

Answer

C. The kidney produces hydrochloric acid to balance pH

Answer

D. The kidney filters out all acids from the blood

Question 5

Kerala's mid-highlands are characterized by specific soil types that support its prominent plantation economy. Which soil type, formed under conditions of high temperature and heavy rainfall, is known for its acidic nature, low inherent fertility (due to intense leaching), and suitability for crops like rubber, tea, and cashew after proper management?

Accepted Answer

B. Laterite soils — Laterite soils are predominantly found in the mid-highlands of Kerala, formed through intense leaching of silica and other bases under tropical conditions of high rainfall and temperature. This process leaves behind oxides of iron and aluminum, making the soil acidic and low in inherent fertility. Despite this, with proper management (liming, fertilization), these soils are well-suited for plantation crops like rubber, tea, and cashew. Alluvial soils are found in river valleys and coastal plains, black soils are rare in Kerala, and red sandy soils, while present, do not fit the description of

Answer

A. Alluvial soils

Answer

C. Black soils

Answer

D. Red sandy soils

Question 6

Heart has chambers:‌​‍

Accepted Answer

4 — 4 chambers — 2 atria + 2 ventricles.‌​‍

Answer

5

Answer

3

Answer

2

Question 7

Rh factor named after:‌​‍

Accepted Answer

Rhesus monkey — Discovered in Rhesus monkey blood.‌​‍

Answer

Rhodium

Answer

Rh bacteria

Answer

Rhine river

Question 8

Deccan Traps formed in:‌​‍

Accepted Answer

Late Cretaceous (~66 mya, around K-Pg boundary) — Flood basalts covering ~500,000 km². ‌​‍Contributed (with Chicxulub impact) to dinosaur extinction. Named for step-like terrain (Dutch 'trap').

Answer

Pleistocene

Answer

Cenozoic

Answer

Jurassic

Question 9

Which Kerala-specific initiative aims to bridge the digital divide in education, particularly in rural areas?

Accepted Answer

B. KITE Victers Channel — KITE Victers Channel is a Kerala-specific initiative providing educational content via television and online platforms to bridge the digital divide. Option A is a national initiative, while C and D are not Kerala-specific.

Answer

A. Aakash Tablet Program

Answer

C. Sarva Shiksha Abhiyan

Answer

D. National Digital Library

Question 10

Kannur International Airport:

Accepted Answer

2018 — Inaugurated 9 December 2018.

Answer

2010

Answer

2020

Answer

2015

DCOA Mixed Practice Test #464