DCOA Mixed Practice Test #715

Question 1

Ashtamudi Lake shape:

Accepted Answer

Octopus-like (8 arms) — Ashtamudi = 'Eight braids' — 8-pointed shape.

Answer

Star

Answer

Circular

Answer

Linear

Question 2

Which of the following is a common ethical consideration in classroom action research?

Accepted Answer

B. Obtaining informed consent from students and parents — Ethical action research requires transparency and respect for participants, including obtaining informed consent from students and parents (B). The other options are either irrelevant (A), unethical (C), or methodologically flawed (D).

Answer

A. Ensuring the research results are published anonymously

Answer

C. Focusing only on high-performing students for better results

Answer

D. Using experimental groups without control groups

Question 3

The maximum number of electrons in the N-shell (n=4) is:‌​‍

Accepted Answer

32 — 2n² = 2×4² = 32.‌​‍

Answer

18

Answer

8

Answer

16

Question 4

The Bharathapuzha, often referred to as 'Nila', is Kerala's second-longest river and holds immense cultural significance. However, it faces severe ecological challenges, particularly a drastic reduction in water flow during the dry season. Which of the following human-induced factors is most directly responsible for exacerbating the dry season water scarcity and the associated increase in sand mining pressures in the river?

Accepted Answer

C. Excessive and unregulated sand mining from the riverbed, leading to deepening, loss of groundwater recharge, and lowering of the water table. — Excessive and unregulated sand mining is directly responsible for exacerbating dry season water scarcity in the Bharathapuzha. The removal of sand deepens the riverbed, detaching it from the surrounding water table, thereby reducing groundwater recharge and lowering the water table. This makes the river appear dry even when there is subsurface flow. While check dams (A) and deforestation (D) contribute to overall water stress, and pollution (B) affects water quality, sand mining directly impacts the river's physical structure and its ability to retain water during lean periods, making it the m

Answer

A. Construction of numerous check dams and barrages for irrigation in its upper reaches across both Kerala and Tamil Nadu.

Answer

B. Uncontrolled discharge of industrial and domestic waste into the river, leading to severe pollution.

Answer

D. Significant deforestation in the catchment area, reducing the capacity for water retention and percolation.

Question 5

Biggest lake Africa:

Accepted Answer

Lake Victoria — Lake Victoria.

Answer

Tanganyika

Answer

Malawi

Answer

Chad

Question 6

1 Kilobyte equals:‌​‍

Accepted Answer

1024 bytes — 1 KB = 1024 bytes (2¹⁰ in binary).‌​‍

Answer

1000 bytes

Answer

512 bytes

Answer

2048 bytes

Question 7

Number of ribs in the human body is:‌​‍

Accepted Answer

12 pairs — 12 pairs of ribs: 7 true, 3 false, 2 floating.‌​‍

Answer

14 pairs

Answer

11 pairs

Answer

10 pairs

Question 8

Nylon 6,6 is made from:‌​‍

Accepted Answer

Hexamethylenediamine + adipic acid — Condensation polymer (polyamide). ‌​‍Named after 6+6 carbons. Strong, elastic — used in ropes, clothing.

Answer

Ethylene

Answer

Isoprene

Answer

Styrene

Question 9

Republic Day:‌​‍

Accepted Answer

26 Jan — 26 January (Constitution came into effect, 1950).‌​‍

Answer

15 Aug

Answer

26 Nov

Answer

2 Oct

Question 10

First woman Chief Minister of Kerala:

Accepted Answer

No woman CM yet — Kerala has not had a woman Chief Minister as of 2026.

Answer

K.R. Gowri Amma

Answer

Aruna Roy

Answer

Lakshmi Sahgal

DCOA Mixed Practice Test #715