DCOA Mixed Practice Test #655

Question 1

A rapidly urbanizing city in Kerala is grappling with escalating air pollution, particularly high levels of PM2.5 and nitrogen oxides (NOx), primarily attributed to increased vehicular traffic and burgeoning industrial activities. Which of the following integrated strategies would be most effective for long-term, sustainable pollution control in this scenario?

Accepted Answer

B. Developing an extensive public transportation network, encouraging non-motorized transport, transitioning industries to renewable energy sources, and enforcing stringent industrial emission standards. — Option B offers the most comprehensive and sustainable long-term solution by addressing both major sources (vehicular and industrial) through systemic changes. Developing public transport and non-motorized transport reduces overall vehicle dependency, while transitioning industries to renewables and enforcing strict standards tackles industrial emissions at the source. Options A, C, and D offer partial, short-term, or less effective solutions, such as merely shifting pollution or relying on palliative measures rather than source reduction.

Answer

A. Implementing strict vehicle emission testing, promoting the use of private electric vehicles, and subsidizing cleaner industrial fuels.

Answer

C. Imposing higher taxes on fossil fuels, relocating highly polluting industries to rural areas, and mandating odd-even traffic schemes in peak hours.

Answer

D. Investing heavily in large-scale air purifiers across the city, promoting afforestation drives, and encouraging residents to use personal protective masks.

Question 2

Westernization as a sociological concept was also introduced by:‌​‍

Accepted Answer

Srinivas — M. ‌​‍N. Srinivas — Westernization = adopting Western values, lifestyle, institutions. ‌​‍Contrasts with Sanskritization (internal mobility).

Answer

Ghurye

Answer

Louis Dumont

Answer

Veena Das

Question 3

Which of the following vitamins is a cofactor for the carboxylation reactions involved in the synthesis of clotting factors like prothrombin?

Accepted Answer

C. Vitamin K — Vitamin K is essential for the carboxylation of glutamic acid residues in clotting factors, enabling them to bind calcium and function in blood coagulation. Deficiency leads to impaired clotting. The other vitamins listed do not play a role in this process.

Answer

A. Vitamin A

Answer

B. Vitamin D

Answer

D. Vitamin E

Question 4

Kerala area:‌​‍

Accepted Answer

38,863 sq km — 22nd largest state.‌​‍

Answer

43,863 sq km

Answer

28,863 sq km

Answer

33,863 sq km

Question 5

The Vaikom Satyagraha was for:‌​‍

Accepted Answer

Road access near temple — Vaikom Satyagraha (1924-25) demanded the right to use public roads near Vaikom temple.‌​‍

Answer

Temple entry

Answer

Land reform

Answer

Voting rights

Question 6

The Malabar Rebellion of 1921 was led by:‌​‍

Accepted Answer

Variyankunnathu Kunjahammed Haji — Variyankunnathu Kunjahammed Haji was a key leader of the Malabar Rebellion (1921), an anti-British uprising influenced by the Khilafat movement.‌​‍

Answer

Pazhassi Raja

Answer

K. Kelappan

Answer

Velu Thampi Dalawa

Question 7

Niagara Falls between:

Accepted Answer

USA and Canada — USA-Canada border.

Answer

USA and Mexico

Answer

Canada and Greenland

Answer

USA and Cuba

Question 8

Focal length of a spherical mirror is related to radius of curvature R as:

Accepted Answer

f = R/2 — For concave/convex mirrors, focal length is half the radius of curvature.

Answer

f = R

Answer

f = 2R

Answer

f = R²

Question 9

Fuse wire melting point:‌​‍

Accepted Answer

Very low — Low melting point alloy. Melts during overload.‌​‍

Answer

Depends on current

Answer

Very high

Answer

Same as copper

Question 10

Tipu Sultan invasions of Malabar:‌​‍

Accepted Answer

1766 onwards — From 1766.‌​‍

Answer

1800

Answer

1857

Answer

1750

DCOA Mixed Practice Test #655