DCOA Mixed Practice Test #339

Question 1

A car rounding a banked curve (friction negligible) has ideal speed v given by:‌​‍

Accepted Answer

v = √(gr tan θ) — Banking angle: tan θ = v²/gr. No friction required at this speed.‌​‍

Answer

v = 2πr

Answer

v = √(g/r)

Answer

v = gr sin θ

Question 2

Kerala population (2011):

Accepted Answer

3.34 cr — 3.34 crore.

Answer

2.34 cr

Answer

4.34 cr

Answer

5.34 cr

Question 3

Which method is considered the MOST effective for sterilizing heat-sensitive medical equipment that cannot withstand high temperatures, such as certain endoscopes?

Accepted Answer

C. Ethylene Oxide (EtO) gas sterilization — Autoclaving (steam sterilization) and boiling water are effective for heat-resistant items but damage heat-sensitive equipment. Ethylene Oxide (EtO) gas sterilization is a low-temperature sterilization method specifically used for heat and moisture-sensitive medical devices, making it the most appropriate choice. Chemical disinfection with 70% alcohol is a disinfectant, not a sterilant, meaning it does not kill all microorganisms, including bacterial spores.

Answer

A. Autoclaving

Answer

B. Boiling water

Answer

D. Chemical disinfection with 70% alcohol

Question 4

Dengue transmitted by:‌​‍

Accepted Answer

Aedes — Aedes aegypti mosquito. Daytime biter.‌​‍

Answer

Anopheles

Answer

Housefly

Answer

Rat

Question 5

INS Vikrant built at:‌​‍

Accepted Answer

Cochin Shipyard — Built by Cochin Shipyard Ltd.‌​‍

Answer

Mumbai

Answer

Vizag

Answer

Chennai

Question 6

In a sample with 10,000 radioactive atoms of half-life 1 month, atoms remaining after 3 months:‌​‍

Accepted Answer

1,250 — After n half-lives: N = N₀/2ⁿ. 3 half-lives: 10000/8 = 1250.‌​‍

Answer

Nil

Answer

5,000

Answer

2,500

Question 7

Biogeochemical cycles include:‌​‍

Accepted Answer

Water, Carbon, Nitrogen, Phosphorus — Gaseous cycles: C, N (atmosphere). ‌​‍Sedimentary: P, S (crust). Human activity disrupts cycles (fertilizer N, burning C).

Answer

Random

Answer

Only water

Answer

Only carbon

Question 8

Social stratification means:‌​‍

Accepted Answer

Hierarchical organisation of society into layers based on wealth, power, prestige — Stratification systems: caste (closed), class (open), estate (feudal), slavery. ‌​‍Max Weber identified 3 dimensions: class (economic), status (prestige), party (political).

Answer

Classification of rocks

Answer

Population count

Answer

Economic growth

Question 9

The online consultation programme of Kerala Women & Child Department launched in February 2021:

Accepted Answer

Bhoomika — 'Bhoomika' offers counselling, legal aid and police assistance online.

Answer

Aswasanidhi

Answer

Kathorth

Answer

One Stop Centres

Question 10

The exchange of oxygen and carbon dioxide between blood and body tissues occurs primarily in which type of blood vessel?

Accepted Answer

C. Capillaries — Capillaries are microscopic blood vessels with extremely thin walls, facilitating the efficient diffusion of gases, nutrients, and waste products between blood and surrounding tissues. Arteries carry blood away from the heart, veins carry blood towards the heart, and arterioles regulate blood flow into capillaries but are not the primary sites of exchange.

Answer

A. Arteries

Answer

B. Veins

Answer

D. Arterioles

DCOA Mixed Practice Test #339