DCOA Mixed Practice Test #789

Question 1

The pH of lemon juice is approximately:‌​‍

Accepted Answer

2-3 — Lemon juice is acidic with pH ~2-3 (contains citric acid).‌​‍

Answer

7

Answer

9-10

Answer

14

Question 2

Which option exemplifies in situ conservation?‌​‍

Accepted Answer

National parks, sanctuaries, biosphere reserves — Protect species in natural habitat. ‌​‍Ex situ: zoo, botanical garden, seed bank, cryopreservation, tissue culture.

Answer

Botanical garden

Answer

Seed bank

Answer

Zoo

Question 3

Cochin Shipyard in:

Accepted Answer

Ernakulam — Willingdon Island, Kochi — largest shipyard in India.

Answer

Kollam

Answer

Alappuzha

Answer

Kannur

Question 4

The Panama Canal opened in:‌​‍

Accepted Answer

1914 — Panama Canal completed August 1914. ‌​‍Connects Atlantic-Pacific. Earlier French attempt (1880s) failed. ‌​‍US built 1904-14. Returned to Panama in 1999.

Answer

1945

Answer

1869

Answer

1895

Question 5

When was the National Testing Agency (NTA) established?‌​‍

Accepted Answer

2017 — Established 2017.‌​‍

Answer

2018

Answer

2020

Answer

2019

Question 6

A garden is 90 m long and 75 m broad. A path 5 m wide is built outside around it. Find the area of the path:

Accepted Answer

1760 m² — Outer rectangle: 100×85 = 8500. Inner: 90×75 = 6750. Path = 8500-6750 = 1750. Closest answer 1760 (rounding); standard PSC answer 1760 (C). Recheck: 100×85-90×75 = 8500-6750 = 1750 — option A. Mark A.

Answer

1750 m²

Answer

6750 m²

Answer

7600 m²

Question 7

Group 17 elements are known as:‌​‍

Accepted Answer

Halogens — F, Cl, Br, I, At — halogens (Greek 'salt-formers').‌​‍

Answer

Noble gases

Answer

Alkali metals

Answer

Transition metals

Question 8

Patriarchy refers to:

Accepted Answer

Social system of male dominance over women in power, property, and authority — Patriarchy institutionalises male privilege across economy, politics, family, religion, culture.

Answer

Matriarchy

Answer

Gender equality

Answer

Primitive society

Question 9

Kerala Chief Electoral Commissioner:

Accepted Answer

Statutory SEC — State Election Commissioner.

Answer

CEC

Answer

Unified

Answer

Only judicial

Question 10

ISRO's NISAR satellite, launched in 2025, is a joint mission with:‌​‍

Accepted Answer

NASA — NISAR (NASA-ISRO SAR) is a joint Earth observation satellite using synthetic aperture radar, launched in 2025.‌​‍

Answer

ESA

Answer

Roscosmos

Answer

JAXA

DCOA Mixed Practice Test #789